id int64 4 73.8M | title stringlengths 10 150 | body stringlengths 17 50.8k | accepted_answer_id int64 7 73.8M | answer_count int64 1 182 | comment_count int64 0 89 | community_owned_date stringlengths 23 27 ⌀ | creation_date stringlengths 23 27 | favorite_count int64 0 11.6k ⌀ | last_activity_date stringlengths 23 27 | last_edit_date stringlengths 23 27 ⌀ | last_editor_display_name stringlengths 2 29 ⌀ | last_editor_user_id int64 -1 20M ⌀ | owner_display_name stringlengths 1 29 ⌀ | owner_user_id int64 1 20M ⌀ | parent_id null | post_type_id int64 1 1 | score int64 -146 26.6k | tags stringlengths 1 125 | view_count int64 122 11.6M | answer_body stringlengths 19 51k |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
20,398,799 | Find K nearest Points to Point P in 2-dimensional plane | <p><em><strong>Source: AMAZON INTERVIEW QUESTION</em></strong></p>
<p>Given a <strong>point P and other N points</strong> in two dimensional space, find <strong>K points</strong> out of the N points which are <strong>nearest</strong> to P.</p>
<p>What is the most optimal way to do this ?</p>
<p>This <a href="http://... | 20,399,027 | 9 | 4 | null | 2013-12-05 11:28:25.327 UTC | 13 | 2021-01-26 15:48:33.593 UTC | 2013-12-05 11:34:03.46 UTC | null | 2,426,101 | null | 2,426,101 | null | 1 | 26 | performance|algorithm|math|language-agnostic | 35,335 | <p><strong>Solution 1</strong> make heap of size K and collect points by minimal distance <strong>O(NLogK)</strong> complexity.</p>
<p><strong>Solution 2</strong>:
Take and array of size N and Sort by distance. Should be used QuickSort (Hoare modification).
As answer take first K points.
This is too NlogN complexity b... |
20,540,831 | Java object analogue to R data.frame | <p>I really like data.frames in R because you can store different types of data in one data structure and you have a lot of different methods to modify the data (add column, combine data.frames,...), it is really easy to extract a <em>subset</em> from the data,...</p>
<p>Is there any Java library available which have ... | 32,481,425 | 6 | 6 | null | 2013-12-12 10:24:08.303 UTC | 11 | 2018-08-16 00:45:10.98 UTC | null | null | null | null | 1,054,451 | null | 1 | 46 | java|r|dataframe | 26,456 | <p>I have just open-sourced a first draft version of <a href="https://github.com/netzwerg/paleo" rel="noreferrer">Paleo</a>, a Java 8 library which offers data frames based on typed columns (including support for primitive values). Columns can be created programmatically (through a simple builder API), or imported from... |
20,886,911 | PHP: self:: vs parent:: with extends | <p>I'm wondering what is the difference between using self:: and parent:: when a static child class is extending static parent class e.g.</p>
<pre><code>class Parent {
public static function foo() {
echo 'foo';
}
}
class Child extends Parent {
public static function func() {
self::foo();
... | 20,887,205 | 2 | 6 | null | 2014-01-02 16:11:42.023 UTC | 13 | 2014-01-02 17:04:38.99 UTC | null | null | null | null | 1,509,200 | null | 1 | 26 | php|class|static|parent|self | 25,990 | <pre><code> Child has foo() Parent has foo()
self::foo() YES YES Child foo() is executed
parent::foo() YES YES Parent foo() is executed
self::foo() YES NO Child foo() is executed
parent... |
10,995,972 | Get validation error messages without saving | <pre><code>Post
:belongs_to :user
User
:has_many :posts
</code></pre>
<p>In my signup workflow they draft a Post first, then on the next page enter their User information to signup.</p>
<pre><code># intermediate step, validate that Post is valid before moving on to User creation
# posts_controller:
@post = Post... | 10,996,090 | 2 | 0 | null | 2012-06-12 11:44:59.813 UTC | 3 | 2012-06-12 11:51:46.613 UTC | null | null | null | null | 811,111 | null | 1 | 32 | ruby-on-rails|ruby-on-rails-3 | 24,283 | <p>If I understand your question correctly you want to get the errors without saving the model?</p>
<p>That is exactly what is happening. <code>@post.valid?</code></p>
<p>will return true or false depending on whether there are any errors. If there are errors. they will be added to <code>@post.errors</code>hash. </p>... |
10,987,444 | How to use global variable in node.js? | <p>For example I want to use custom logger:</p>
<pre><code>logger = require('basic-logger'),
logger.setLevel('info')
var customConfig = {
showMillis: true,
showTimestamp: true
}
var log = new logger(customConfig)
</code></pre>
<p>How to use this logger in other modules instead of console.log ?</p> | 10,987,543 | 7 | 4 | null | 2012-06-11 20:59:17.603 UTC | 18 | 2019-07-09 12:09:56.933 UTC | 2012-06-11 21:16:06.427 UTC | null | 1,407,156 | null | 418,507 | null | 1 | 101 | node.js | 264,890 | <p>Most people advise against using global variables. If you want the same logger class in different modules you can do this</p>
<p>logger.js</p>
<pre><code> module.exports = new logger(customConfig);
</code></pre>
<p>foobar.js</p>
<pre><code> var logger = require('./logger');
logger('barfoo');
</code></pre>
<... |
48,201,729 | Difference between np.dot and np.multiply with np.sum in binary cross-entropy loss calculation | <p>I have tried the following code but didn't find the difference between <strong>np.dot</strong> and <strong>np.multiply with np.sum</strong> </p>
<p>Here is <strong>np.dot</strong> code</p>
<pre><code>logprobs = np.dot(Y, (np.log(A2)).T) + np.dot((1.0-Y),(np.log(1 - A2)).T)
print(logprobs.shape)
print(logprobs)
cos... | 48,202,241 | 4 | 7 | null | 2018-01-11 07:21:47.19 UTC | 19 | 2021-02-22 09:35:59.09 UTC | 2019-05-08 18:41:35.553 UTC | null | 2,956,066 | null | 4,539,906 | null | 1 | 34 | python|numpy|neural-network|sum|difference | 55,812 | <p>What you're doing is calculating the <a href="https://en.wikipedia.org/wiki/Cross_entropy#Cross-entropy_loss_function_and_logistic_regression" rel="nofollow noreferrer"><strong>binary cross-entropy loss</strong></a> which measures how bad the predictions (here: <code>A2</code>) of the model are when compared to the ... |
12,965,296 | How to get maximum document scrolltop value | <p>I am making some plugin and I need to get maximum <code>scrollTop</code> value of the document.
Maximum <code>scrollTop</code> value is <code>2001</code> , but <code>$(document).height()</code> returns <code>2668</code> and <code>$('body')[0].scrollHeight</code> gives me <code>undefined</code>.</p>
<p>How to get <c... | 12,965,383 | 5 | 6 | null | 2012-10-18 23:30:43.08 UTC | 4 | 2021-06-26 04:40:22.38 UTC | 2012-10-18 23:44:48.617 UTC | null | 498,031 | null | 855,705 | null | 1 | 21 | javascript|jquery|scrolltop | 45,883 | <p>The code in your comments should work:</p>
<pre><code>$(document).height() - $(window).height()
</code></pre>
<p>Here's an example that alerts when you scroll to the maximum scroll position: <a href="http://jsfiddle.net/DWn7Z/">http://jsfiddle.net/DWn7Z/</a></p> |
12,750,864 | Temporary e-mail accounts for integration tests | <p>I would like to write some integration tests which verify if user receive registration confirmation e-mails.</p>
<p>Ideally, for this purpose I would like:</p>
<ol>
<li>Create temporary e-mail account.</li>
<li>Pass it in registration form.</li>
<li>Check if we receive e-mail.</li>
<li>Delete e-mail account.</li>
... | 13,053,612 | 5 | 4 | null | 2012-10-05 17:03:24.763 UTC | 10 | 2020-10-13 23:10:48.26 UTC | null | null | null | null | 341,181 | null | 1 | 36 | email|testing|integration-testing | 56,625 | <p><a href="http://mailinator.com">http://mailinator.com</a> supports POP3.</p>
<p>Connect to the server via POP3 with any username and check e-mail.</p> |
13,013,781 | How to draw a rectangle over a specific region in a matplotlib graph | <p>I have a graph, computed from some data, drawn in matplotlib. I want to draw a rectangular region around the global maximum of this graph. I tried <code>plt.axhspan,</code> but the rectangle doesn't seem to appear when I call <code>plt.show()</code></p>
<p>So, how can a rectangular region be drawn onto a matplotl... | 13,014,729 | 2 | 0 | null | 2012-10-22 14:39:00.767 UTC | 6 | 2021-10-23 17:58:19.67 UTC | null | null | null | null | 1,084,573 | null | 1 | 43 | python|matplotlib | 59,972 | <p>The most likely reason is that you used data units for the x arguments when calling axhspan. From <a href="https://matplotlib.org/stable/api/_as_gen/matplotlib.axes.Axes.axhspan.html" rel="nofollow noreferrer">the function's docs</a> (my emphasis):</p>
<blockquote>
<p>y coords are in data units and <em>x coords are ... |
12,709,074 | How do you explicitly set a new property on `window` in TypeScript? | <p>I setup global namespaces for my objects by explicitly setting a property on <code>window</code>.</p>
<pre><code>window.MyNamespace = window.MyNamespace || {};
</code></pre>
<p>TypeScript underlines <code>MyNamespace</code> and complains that:</p>
<blockquote>
<p>The property 'MyNamespace' does not exist on val... | 12,709,880 | 29 | 1 | null | 2012-10-03 13:01:15.793 UTC | 178 | 2022-06-29 10:02:33.567 UTC | null | null | null | null | 31,308 | null | 1 | 1,076 | typescript | 627,061 | <p>I just found the answer to this in <a href="https://stackoverflow.com/a/12703866/31308">another Stack Overflow question's answer</a>.</p>
<pre><code>declare global {
interface Window { MyNamespace: any; }
}
window.MyNamespace = window.MyNamespace || {};
</code></pre>
<p>Basically, you need to extend the existin... |
12,731,428 | jQuery "Does not have attribute" selector? | <p>I can find a div that has an attribute like so:</p>
<pre><code>$('.funding-plan-container[data-timestamp]')
</code></pre>
<p>But if I try to find a div that does not have that attribute, I get an error - my code is:</p>
<pre><code>$('.funding-plan-container[!data-timestamp]')
</code></pre>
<p>Is there a "does no... | 12,731,439 | 3 | 0 | null | 2012-10-04 16:13:47.49 UTC | 10 | 2020-05-29 15:10:46.067 UTC | null | null | null | null | 726,221 | null | 1 | 158 | javascript|jquery | 89,121 | <p>Use the <a href="http://api.jquery.com/not-selector/" rel="noreferrer"><code>:not()</code></a> selector.</p>
<pre><code>$('.funding-plan-container:not([data-timestamp])')
</code></pre>
<hr>
<p>This, by the way, is a valid <a href="http://www.w3.org/TR/selectors-api/" rel="noreferrer"><em>Selectors API</em></a> se... |
17,075,577 | Database Design with Change History | <p>I am looking to design a database that keeps track of every set of changes so that I can refer back to them in the future. So for example:</p>
<pre><code>Database A
+==========+========+==========+
| ID | Name | Property |
1 Kyle 30
</code></pre>
<p>If I change the row's 'property' fiel... | 17,075,789 | 4 | 4 | null | 2013-06-12 21:21:05.773 UTC | 22 | 2020-03-17 23:20:29.517 UTC | 2019-08-02 14:30:51.543 UTC | null | 1,828,296 | null | 1,109,360 | null | 1 | 39 | sql|postgresql|change-tracking | 28,497 | <p>One way is to have a <code>MyTableNameHistory</code> for every table in your database, and make its schema identical to the schema of table <code>MyTableName</code>, except that the Primary Key of the History table has one additional column named <code>effectiveUtc</code> as a DateTime. For example, if you have a t... |
16,824,355 | Logging in Ruby on Rails in Production Mode | <p>I would like to view some variables in controller, it tried the following:</p>
<p><code>Rails.logger.debug "Year: #{Time.now.year}"</code></p>
<p><code>puts "Year: #{Time.now.year}, Month: #{@month}"</code></p>
<p>where can I see the output for Logger or Puts in production mode? Do I need so set something up to ... | 16,832,519 | 3 | 0 | null | 2013-05-29 21:41:24.237 UTC | 8 | 2021-10-12 14:54:41.417 UTC | 2014-04-14 19:29:40.58 UTC | null | 2,800,417 | null | 1,135,541 | null | 1 | 51 | ruby-on-rails|logging|production | 66,893 | <p>The normal log level in production is <code>info</code>, so <code>debug</code> logs are not shown.<br>
Change your logging to</p>
<pre><code>Rails.logger.info "Year: #{Time.now.year}"
</code></pre>
<p>to show it in <code>production.log</code>.</p>
<p>Alternatively (but not a good idea) you can raise the logging l... |
17,095,324 | Fastest way to determine if an integer is between two integers (inclusive) with known sets of values | <p>Is there a faster way than <code>x >= start && x <= end</code> in C or C++ to test if an integer is between two integers?</p>
<p><em>UPDATE</em>: My specific platform is iOS. This is part of a box blur function that restricts pixels to a circle in a given square.</p>
<p><em>UPDATE</em>: After trying ... | 17,095,534 | 7 | 31 | 2013-08-19 15:24:53.37 UTC | 2013-06-13 19:21:42.93 UTC | 199 | 2021-02-16 02:47:53.837 UTC | 2017-05-23 12:09:54.79 UTC | null | -1 | null | 56,079 | null | 1 | 409 | c++|c|performance|math | 82,296 | <p>There's an old trick to do this with only one comparison/branch. Whether it'll really improve speed may be open to question, and even if it does, it's probably too little to notice or care about, but when you're only starting with two comparisons, the chances of a huge improvement are pretty remote. The code looks l... |
4,380,054 | Calling Clojure from .NET | <p>I have been spending some time playing with Clojure-CLR. My REPL is working, I can call .NET classes from Clojure, but I have not been able to figure out calling compiled Clojure dlls from C# classes. </p>
<p>I have been trying to adapt the java example found <a href="https://stackoverflow.com/questions/2181774/cal... | 4,394,405 | 2 | 0 | null | 2010-12-07 18:11:36.07 UTC | 12 | 2013-07-26 19:00:50.397 UTC | 2017-05-23 12:17:00.903 UTC | null | -1 | null | 388,187 | null | 1 | 21 | .net|clojure|clojureclr | 3,742 | <p>I was able to get it to work doing the following:</p>
<p>First I changed your code a bit, I was having trouble with the namespace and the compiler thinking the dots were directories. So I ended up with this.</p>
<pre><code>(ns hello
(:require [clojure.core])
(:gen-class
:methods [#^{:static true} [output [... |
10,037,887 | How can I put titles in ViewPager using fragments? | <p>I am using ViewPager to allow user to swipe between fragments.</p>
<p>How can I add a the title of each fragment to the screen?</p>
<pre><code>package com.multi.andres;
import java.util.List;
import java.util.Vector;
import com.viewpagerindicator.TitlePageIndicator;
import com.viewpagerindicator.TitleProvider;
... | 10,039,279 | 4 | 1 | null | 2012-04-06 00:39:14.157 UTC | 11 | 2016-02-15 08:26:36.16 UTC | 2014-12-13 15:21:09.27 UTC | null | 844,882 | null | 1,314,019 | null | 1 | 7 | java|android|android-fragments|android-viewpager|android-fragmentactivity | 25,790 | <p>You can also use Jake Wharton's <a href="http://viewpagerindicator.com/" rel="noreferrer">ViewPagerIndicator</a> library to get the desired effect. Davek804's answer works too, but it requires you to reference the entire ActionBarSherlock library, which isn't as preferable if you only need a <code>ViewPager</code> t... |
9,906,571 | Semantic Grid with Bootstrap + LESS Mixins ¿ HOW? | <p>Twitter bootstrap documentation talks about three mixins to generate grid systems:</p>
<pre><code>.container-fixed();
#grid > .core();
#grid > .fluid();
</code></pre>
<p>I know how to setup the page to use bootstrap and less... But I don't know how to use the grid system semantically. The documentation says ... | 11,569,397 | 1 | 1 | null | 2012-03-28 11:30:05.127 UTC | 9 | 2012-08-25 04:04:47.64 UTC | 2012-03-28 15:55:45.11 UTC | null | 1,267,307 | null | 1,092,437 | null | 1 | 9 | css|twitter|twitter-bootstrap|less|mixins | 5,207 | <p>In navbar.less of bootstrap you will find the following.</p>
<h1>grid and .core are used to namespace the .span()</h1>
<pre><code>.navbar-fixed-top .container,
.navbar-fixed-bottom .container {
#grid > .core > .span(@gridColumns);
}
</code></pre>
<p>In cases where you want to keep "span3" etc out of ... |
10,061,597 | Creating materialized view that refreshes every 5 min | <p>I created a materialized view that refreshed every 5 min but when I do insert and perform select on materialized view I get same old data? Do I need to refresh manually?</p>
<pre><code>CREATE MATERIALIZED VIEW MVW_TEST
REFRESH FORCE ON DEMAND
START WITH TO_DATE('01-01-2009 00:01:00', 'DD-MM-YYYY HH24:MI:SS') NEXT ... | 10,062,283 | 2 | 3 | null | 2012-04-08 08:51:24.957 UTC | 9 | 2017-04-20 12:30:22.543 UTC | 2012-04-08 09:15:01.7 UTC | null | 2,214,674 | null | 2,214,674 | null | 1 | 12 | oracle|oracle11g | 89,373 | <p>I have demonstrated in steps where a materialized view refresh after every <code>one minute</code> ,for having
a mv which refresh after 5 minute use <code>next(sysdate+5/1440)</code></p>
<p>Step1: </p>
<pre><code>Create table temp (A int);
</code></pre>
<p>Step2:</p>
<pre><code>Create Materialized view temp_... |
10,087,782 | Error: Specified cast is not valid. (SqlManagerUI) | <p>I have a backup from database in SQL Server 2008 R2.
When I want to restore this backup to SQL Server, I get this error:
"Error: Specified cast is not valid. (SqlManagerUI)"
How to I resolve this error?
Thanks.</p> | 10,125,525 | 4 | 1 | null | 2012-04-10 11:22:05.733 UTC | 2 | 2017-08-17 20:05:08.91 UTC | null | null | null | null | 492,361 | null | 1 | 16 | sql-server-2008-r2|database-restore | 121,954 | <p>There are some <a href="http://social.msdn.microsoft.com/forums/en-us/sqlsetupandupgrade/thread/071DA5BB-32C5-4C3F-9378-7E67C5DF2D44" rel="noreferrer">funnies</a> restoring old databases into SQL 2008 via the guy; have you tried doing it via TSQL ?</p>
<pre><code>Use Master
Go
RESTORE DATABASE YourDB
FROM DISK = 'C... |
10,217,489 | methods in foreach and for loops in java | <p>My question is regarding optimization in java using the Android compiler. Will map.values() in the following be called every iteration, or will the Android compiler optimize it out.</p>
<pre><code>LinkedHashMap<String, Object> map;
for (Object object : map.values())
{
//do something with object
}
</code>... | 10,217,534 | 1 | 4 | null | 2012-04-18 20:32:27.563 UTC | 4 | 2016-07-17 22:19:32 UTC | 2012-04-18 21:02:54.937 UTC | null | 758,074 | null | 758,074 | null | 1 | 28 | java|android | 87,566 | <p>In the first example, <code>map.values()</code> will be evaluated once. According to the <a href="http://docs.oracle.com/javase/specs/jls/se7/html/jls-14.html#jls-14.14.2" rel="noreferrer">Section 14.4.2 of the Java Language Specification</a>, it is equivalent to:</p>
<pre><code>for (Iterator<Object> i = map.... |
10,225,727 | Should ConditionalWeakTable<TKey, TValue> be used for non-compiler purposes? | <p>I've recently come across the <a href="http://msdn.microsoft.com/en-us/library/dd287757.aspx" rel="noreferrer"><code>ConditionalWeakTable<TKey,TValue></code></a> class in my search for an <code>IDictionary</code> which uses weak references, as suggested in answers <a href="https://stackoverflow.com/questions/2... | 10,267,942 | 1 | 0 | null | 2012-04-19 10:00:25.85 UTC | 8 | 2016-06-09 13:40:43.29 UTC | 2017-05-23 10:34:12.23 UTC | null | -1 | null | 177,117 | null | 1 | 33 | c#|garbage-collection|clr|weak-references|ephemeron | 5,206 | <p>I don't see anything wrong with using <code>ConditionalWeakTable</code>. If you need ephemerons, you pretty much have no other choice.</p>
<p>I don't think future .NET versions will be a problem - even if only compilers would use this class, Microsoft still couldn't change it without breaking compatibility with exi... |
10,021,847 | For loop in multidimensional javascript array | <p>Since now, I'm using this loop to iterate over the elements of an array, which works fine even if I put objects with various properties inside of it.</p>
<pre><code>var cubes[];
for (i in cubes){
cubes[i].dimension
cubes[i].position_x
ecc..
}
</code></pre>
<p>Now, let's suppose cubes[] is declared th... | 10,021,901 | 8 | 0 | null | 2012-04-05 02:22:11.003 UTC | 30 | 2022-01-18 20:33:45 UTC | 2022-01-18 20:33:45 UTC | null | 215,552 | null | 1,307,020 | null | 1 | 49 | javascript|loops|multidimensional-array | 210,183 | <p>You can do something like this:</p>
<pre><code>var cubes = [
[1, 2, 3],
[4, 5, 6],
[7, 8, 9],
];
for(var i = 0; i < cubes.length; i++) {
var cube = cubes[i];
for(var j = 0; j < cube.length; j++) {
display("cube[" + i + "][" + j + "] = " + cube[j]);
}
}
</code></pre>
<p>Working jsF... |
9,666,471 | jQuery advantages/differences in .trigger() vs .click() | <p>In terms of performance, what are the gains (or just differences) between:</p>
<pre><code>$('.myEl').click();
</code></pre>
<p>and </p>
<pre><code>$('.myEl').trigger('click');
</code></pre>
<p>Are there any at all?</p> | 9,666,577 | 4 | 0 | null | 2012-03-12 11:49:47.777 UTC | 11 | 2015-06-16 19:52:41.81 UTC | null | null | null | null | 478,144 | null | 1 | 78 | jquery | 26,877 | <p><a href="http://james.padolsey.com/jquery/#v=1.7.2&fn=$.fn.click" rel="noreferrer">This is the code for the <code>click</code> method</a>: </p>
<pre><code>jQuery.fn.click = function (data, fn) {
if (fn == null) {
fn = data;
data = null;
}
return arguments.length > 0 ? this.on("cl... |
9,679,375 | How can I run an EXE file from my C# code? | <p>I have an EXE file reference in my C# project. How do I invoke that EXE file from my code?</p> | 9,679,614 | 4 | 0 | null | 2012-03-13 06:35:57.36 UTC | 47 | 2021-08-31 13:21:47.817 UTC | 2021-08-31 13:21:47.817 UTC | null | 63,550 | null | 969,188 | null | 1 | 210 | c#|.net | 410,409 | <pre><code>using System.Diagnostics;
class Program
{
static void Main()
{
Process.Start("C:\\");
}
}
</code></pre>
<p>If your application needs cmd arguments, use something like this:</p>
<pre><code>using System.Diagnostics;
class Program
{
static void Main()
{
LaunchCommandLineA... |
8,246,520 | Does Python's os.system() wait for an end of the process? | <p>The <a href="http://docs.python.org/library/os.html#os.system">Python manual</a> says nothing about whether <code>os.system("cmd")</code> waits or not for a process to end:</p>
<p>To quote the manual:</p>
<blockquote>
<p>Execute the command (a string) in a subshell.</p>
</blockquote>
<p>It looks like it does wa... | 8,246,562 | 3 | 1 | null | 2011-11-23 17:24:09.103 UTC | 1 | 2021-02-12 11:21:57.783 UTC | 2011-11-23 20:03:28.72 UTC | null | 102,441 | Adobe | 788,700 | null | 1 | 30 | python | 38,197 | <p>Yes it does. The return value of the call is the exit code of the subprocess.</p> |
7,891,697 | Numpy Adding two vectors with different sizes | <p>If I have two numpy arrays of different sizes, how can I superimpose them.</p>
<pre><code>a = numpy([0, 10, 20, 30])
b = numpy([20, 30, 40, 50, 60, 70])
</code></pre>
<p>What is the cleanest way to add these two vectors to produce a new vector (20, 40, 60, 80, 60, 70)?</p>
<p>This is my generic question. For back... | 7,891,889 | 3 | 1 | null | 2011-10-25 15:28:03.683 UTC | 6 | 2020-07-02 00:55:57.343 UTC | 2011-10-25 15:41:44.07 UTC | null | 53,850 | null | 454,217 | null | 1 | 36 | python|numpy|linear-algebra | 35,629 | <p>This could be what you are looking for</p>
<pre><code>if len(a) < len(b):
c = b.copy()
c[:len(a)] += a
else:
c = a.copy()
c[:len(b)] += b
</code></pre>
<p>basically you copy the longer one and then add in-place the shorter one</p> |
11,698,935 | Jquery element+class selector performance | <p>I was hoping <code>$('#childDiv2 .txtClass')</code> or <code>$('#childDiv2 input.txtClass')</code> perform better when selecting <code><input type="text" id="txtID" class="txtClass"/></code> element. But according to this <a href="http://jsperf.com/selectors-perf/3" rel="noreferrer">performance analysis</a> <c... | 11,699,147 | 4 | 3 | null | 2012-07-28 06:45:04.73 UTC | 21 | 2013-10-16 13:56:40.737 UTC | 2012-07-28 07:37:48.447 UTC | null | 106,224 | null | 857,956 | null | 1 | 30 | jquery|jquery-selectors|performance | 61,762 | <p>Modern browsers expose a very efficient <a href="https://developer.mozilla.org/en/DOM/document.getElementsByClassName" rel="noreferrer">getElementsByClassName()</a> method that returns the elements having a given class. That's why a single class selector is faster in your case.</p>
<p>To elaborate on your examples:... |
11,989,746 | Escape special chars in RegEx? | <p>I have a form, that sends the contents of a text field to my Rails application and
I have to generate a regular expression of this string. </p>
<p>I tried it like this:</p>
<pre><code>regex = /#{params[:text]}/
</code></pre>
<p>In general this is working, but if brackets or special characters are contained in th... | 11,989,938 | 2 | 0 | null | 2012-08-16 14:44:49.327 UTC | 4 | 2018-01-03 08:59:33.957 UTC | 2012-08-16 14:59:04.597 UTC | null | 128,421 | null | 1,414,540 | null | 1 | 32 | ruby-on-rails|ruby|regex | 13,935 | <p>You should use <a href="http://www.ruby-doc.org/core-1.9.3/Regexp.html#method-c-escape" rel="noreferrer"><code>Regexp.escape</code></a></p>
<pre><code>regex = /#{Regexp.escape(params[:text])}/
# in rails models/controllers with mongoid use:
# ::Regexp.escape(params[:text]) instead. ([more info][2])
</code></pre> |
11,587,119 | Is this a web page or an image? | <p><a href="http://lcamtuf.coredump.cx/squirrel/" rel="noreferrer">http://lcamtuf.coredump.cx/squirrel/</a></p>
<p>According to the author, </p>
<blockquote>
<p>This is an embedded landing page for an image. You can link to this
URL and get the HTML document you are viewing right now (soon to
include essential ... | 11,587,183 | 2 | 4 | null | 2012-07-20 21:23:50.353 UTC | 25 | 2015-03-06 16:52:40.03 UTC | 2015-03-06 16:52:40.03 UTC | null | 616,443 | null | 616,443 | null | 1 | 46 | html|image|encoding | 4,604 | <p>The file you linked is a polyglot - a combination of languages. It can be read and understood as <strong>both</strong> an image and an HTML file. It's a simple trick. If you look at the HTML source you can see this at the top:</p>
<pre><code>ÿØÿà
</code></pre>
<p>A quick Google shows this looks like a JPEG header.... |
11,976,223 | How to deal with missing src/test/java source folder in Android/Maven project? | <p>I'm not very experienced with Maven in combination with Android yet, so I followed <a href="http://rgladwell.github.com/m2e-android/" rel="noreferrer">these</a> instructions to make a new Android project. When the project has been created, I get the following error message: </p>
<blockquote>
<p>Project 'xxx-1.0-S... | 11,978,134 | 10 | 4 | null | 2012-08-15 19:51:58.51 UTC | 12 | 2021-12-18 20:46:16.333 UTC | 2021-12-18 20:46:16.333 UTC | null | 1,824,361 | null | 319,773 | null | 1 | 49 | java|android|eclipse|maven|m2eclipse | 136,733 | <p>I realise this annoying thing too since latest m2e-android plugin upgrade (version 0.4.2), it happens in both new project creation and existing project import (if you don't use src/test/java).</p>
<p>It looks like m2e-android (or perhaps m2e) now always trying to add <code>src/test/java</code> as a source folder, r... |
11,525,717 | When does the App Engine scheduler use a new thread vs. a new instance? | <p>If I set <code>threadsafe: true</code> in my <code>app.yaml</code> file, what are the rules that govern when a new instance will be created to serve a request, versus when a new thread will be created on an existing instance?</p>
<p>If I have an app which performs something computationally intensive on each request... | 11,882,719 | 3 | 2 | null | 2012-07-17 15:23:33.387 UTC | 12 | 2012-08-09 16:45:00.83 UTC | null | null | null | null | 23,786 | null | 1 | 60 | python|google-app-engine | 2,840 | <p>The following set of rules are currently used to determine if a given instance can accept a new request:</p>
<pre><code>if processing more than N concurrent requests (today N=10): false
elif exceeding the soft memory limit: false
elif exceeding the instance class CPU limit: false
elif warming up: false
else true
</... |
11,930,996 | PGError: ERROR: permission denied for relation (when using Heroku) | <p>I've recently gone through the database migration process as outlined here:</p>
<p><a href="https://devcenter.heroku.com/articles/migrating-from-shared-database-to-heroku-postgres" rel="noreferrer">https://devcenter.heroku.com/articles/migrating-from-shared-database-to-heroku-postgres</a></p>
<p>Now I'm seeing a n... | 11,935,926 | 6 | 1 | null | 2012-08-13 08:56:45.63 UTC | 13 | 2019-02-28 01:54:23.193 UTC | 2014-02-05 19:47:46.707 UTC | null | 2,229,277 | null | 492,242 | null | 1 | 78 | database|postgresql|heroku|permissions | 37,880 | <p>I had a similar problem but the root cause was that my app was pointing to the old dev database which had exceeded it's limit of 10,000 rows.</p>
<p>Although I created a new Basic db and backed everything up, the app was still pointing the old dev DB.</p>
<pre><code>heroku pg:info
</code></pre>
<p>Check to see th... |
3,984,019 | MySQL user-defined variable in WHERE clause | <p>I want to know if there is a way to use a user-defined variable in <code>WHERE</code> clause, as in this example:</p>
<pre><code>SELECT id, location, @id := 10 FROM songs WHERE id = @id
</code></pre>
<p>This query runs with no errors but doesn't work as expected.</p> | 6,021,738 | 4 | 2 | null | 2010-10-21 03:14:45.467 UTC | 1 | 2016-12-01 11:32:13.697 UTC | 2012-04-16 12:16:26.513 UTC | null | 225,037 | null | 222,758 | null | 1 | 25 | mysql|where-clause | 42,876 | <p>Not far from what Mike E. proposed, but one statement:</p>
<pre><code>SELECT id, location FROM songs, ( SELECT @id := 10 ) AS var WHERE id = @id;
</code></pre>
<p>I used similar queries to emulate window functions in MySQL. E.g. <a href="http://explainextended.com/2009/03/05/row-sampling/" rel="noreferrer">Row sam... |
3,289,198 | Custom attribute on property - Getting type and value of attributed property | <p>I have the following custom attribute, which can be applied on properties:</p>
<pre><code>[AttributeUsage(AttributeTargets.Property, AllowMultiple = false)]
public class IdentifierAttribute : Attribute
{
}
</code></pre>
<p>For example:</p>
<pre><code>public class MyClass
{
[Identifier()]
public string Nam... | 3,289,235 | 4 | 0 | null | 2010-07-20 10:51:49.987 UTC | 11 | 2019-11-27 10:55:33.057 UTC | 2014-06-12 17:45:42.543 UTC | null | 1,804,678 | null | 131,809 | null | 1 | 37 | c#|.net|custom-attributes | 77,932 | <p>Something like the following,, this will use only the first property it comes accross that has the attribute, of course you could place it on more than one..</p>
<pre><code> public object GetIDForPassedInObject(T obj)
{
var prop = typeof(T).GetProperties(BindingFlags.Public | BindingFlags.Instance)
... |
3,840,784 | Appending turns my list to NoneType | <p>In Python Shell, I entered: </p>
<pre><code>aList = ['a', 'b', 'c', 'd']
for i in aList:
print(i)
</code></pre>
<p>and got </p>
<pre><code>a
b
c
d
</code></pre>
<p>but when I tried: </p>
<pre><code>aList = ['a', 'b', 'c', 'd']
aList = aList.append('e')
for i in aList:
print(i)
</co... | 3,840,802 | 4 | 0 | null | 2010-10-01 15:45:13 UTC | 7 | 2021-07-14 10:57:25.683 UTC | 2010-10-01 15:52:33.863 UTC | null | 12,855 | null | 460,847 | null | 1 | 37 | python|mutators | 72,068 | <p><code>list.append</code> is a method that modifies the existing list. It doesn't return a new list -- it returns <code>None</code>, like most methods that modify the list. Simply do <code>aList.append('e')</code> and your list will get the element appended.</p> |
3,580,802 | How to use git (git config --global)? | <p>The <a href="http://www.pragprog.com/titles/pg_git/pragmatic-guide-to-git" rel="noreferrer">Pragmatic Guide to GIT</a> has the following "Git uses both to calculate the commit ID—a SHA-111 hash—that identifies each commit." in page 21.</p>
<p>And in page 22, I can use the following command to 'Configure Git to know... | 3,580,841 | 4 | 1 | null | 2010-08-27 01:53:08.877 UTC | 5 | 2018-09-13 11:43:11.09 UTC | 2010-08-27 02:20:25.653 UTC | null | 260,127 | null | 260,127 | null | 1 | 43 | git|configuration | 68,764 | <p>Not sure where "smcho" comes from, but the setting to set your name is <code>user.name</code>:</p>
<pre><code>git config --global user.name "Your Name"
</code></pre>
<p>You can set your e-mail address too:</p>
<pre><code>git config --global user.email "name@domain.example"
</code></pre>
<p>I guess the reason it ... |
3,643,580 | Is there a portable C compiler for windows? | <p>I want to carry one in my flash drive and run it. </p>
<p>Thanks</p> | 3,643,595 | 6 | 0 | null | 2010-09-04 18:59:37.287 UTC | 6 | 2017-08-01 13:36:25.607 UTC | null | null | null | null | 88,447 | null | 1 | 16 | c|windows|compiler-construction|portability | 48,211 | <p><a href="http://www.mingw.org/" rel="noreferrer">MinGW</a> is a pretty good one and can be easily copied to a flash drive. Admittedly this is a port of GCC, but it works well in Windows. A drawback of this compiler is that it does not understand some of the specific Microsoft <a href="http://msdn.microsoft.com/en-... |
3,494,115 | What does $_ mean in PowerShell? | <p>I've seen the following a lot in PowerShell, but what does it do exactly?</p>
<pre><code>$_
</code></pre> | 3,494,138 | 7 | 1 | null | 2010-08-16 14:33:33.923 UTC | 58 | 2022-02-22 14:00:19.43 UTC | 2016-02-01 19:54:15.27 UTC | null | 63,550 | null | 17,744 | null | 1 | 280 | powershell | 301,349 | <p>This is the variable for the current value in the pipe line, which is called <code>$PSItem</code> in Powershell 3 and newer. </p>
<pre><code>1,2,3 | %{ write-host $_ }
</code></pre>
<p>or</p>
<pre><code>1,2,3 | %{ write-host $PSItem }
</code></pre>
<p>For example in the above code the <code>%{}</code> block i... |
3,515,264 | Can I change the Android startActivity() transition animation? | <p>I am starting an activity and would rather have a alpha fade-in for <code>startActivity()</code>, and a fade-out for the <code>finish()</code>. How can I go about this in the Android SDK?</p> | 3,515,625 | 10 | 2 | null | 2010-08-18 18:16:33.777 UTC | 37 | 2021-12-03 12:46:29.81 UTC | null | null | null | null | 69,634 | null | 1 | 120 | android|animation|fade|transition | 154,739 | <p>In the same statement in which you execute finish(), execute your animation there too. Then, in the new activity, run another animation. See this code:</p>
<p>fadein.xml</p>
<pre><code><set xmlns:android="http://schemas.android.com/apk/res/android"
android:fillAfter="true">
<alpha android:fromA... |
3,453,085 | What is :: (double colon) in Python when subscripting sequences? | <p>I know that I can use something like <code>string[3:4]</code> to get a substring in Python, but what does the 3 mean in <code>somesequence[::3]</code>?</p> | 3,453,103 | 11 | 3 | null | 2010-08-10 20:21:53.817 UTC | 105 | 2021-07-22 21:39:48.077 UTC | 2017-02-03 23:08:27.097 UTC | null | 15,168 | null | 414,064 | null | 1 | 370 | python|syntax|slice | 310,879 | <p>it means 'nothing for the first argument, nothing for the second, and jump by three'. It gets every third item of the sequence sliced.
<a href="http://docs.python.org/release/2.3.5/whatsnew/section-slices.html">Extended slices</a> is what you want. New in Python 2.3</p> |
8,330,838 | VBA Date as integer | <p>is there a way to get the underlying integer for <code>Date</code> function in VBA ? I'm referring to the integer stored by Excel to describe dates in memory in terms of number of days (when time is included it can be a float then I guess). I'm only interest in the integer part though. Is there just another function... | 8,330,916 | 4 | 0 | null | 2011-11-30 18:16:43.997 UTC | 2 | 2020-07-06 10:15:41.483 UTC | 2020-07-06 10:15:41.483 UTC | null | 6,296,561 | null | 1,029,944 | null | 1 | 24 | excel|vba|date|datetime | 180,879 | <p>Date is not an Integer in VB(A), it is a Double.</p>
<p>You can get a Date's value by passing it to <code>CDbl()</code>.</p>
<pre class="lang-vb prettyprint-override"><code>CDbl(Now()) ' 40877.8052662037
</code></pre>
<p>From the <a href="https://docs.microsoft.com/en-us/office/troubleshoot/excel/1900-and-1... |
8,118,741 | CSS Font "Helvetica Neue" | <p>I often see the websites using font "Helvetica Neue". Is this font safe to use, like eg. Arial? Or do the browsers have trouble rendering it or not many machines have this font? Thanks.</p> | 8,118,772 | 5 | 2 | null | 2011-11-14 07:57:33.903 UTC | 18 | 2020-07-12 16:15:08.657 UTC | null | null | null | null | 523,364 | null | 1 | 45 | css|fonts | 176,639 | <p>This font is not standard on all devices. It is installed by default on some Macs, but rarely on PCs and mobile devices.</p>
<p>To use this font on all devices, use a <a href="http://www.css3.info/preview/web-fonts-with-font-face/" rel="noreferrer">@font-face declaration</a> in your CSS to link to it on your domain... |
8,158,987 | rails 3.1 asset pipeline css caching in development | <p>I'm a bit confused as it seems like the application.css is including itself twice, once when it lists the resources from the manifest and then a cache of that. So when I delete an individual file it still seems to stay alive inside the application.css file.</p>
<h1>application.css (source)</h1>
<pre><code>/*
*= ... | 8,164,860 | 10 | 3 | null | 2011-11-16 21:28:56.18 UTC | 13 | 2013-09-27 01:38:28.02 UTC | 2011-11-16 21:35:24.587 UTC | null | 116,522 | null | 116,522 | null | 1 | 36 | ruby-on-rails-3|ruby-on-rails-3.1|asset-pipeline|sass | 20,552 | <p>I had a problem like this before. It was caused after I had precompiled the assets it was going after the applcation.css inside the public folder as well as in the apps directory. I'm not sure how to fix it so that it doesn't keep happening while in dev mode but if you delete your <code>/public/assets</code> direc... |
4,091,441 | How do I index and search text files in Lucene 3.0.2? | <p>I am newbie in Lucene, and I'm having some problems creating simple code <strong>to query a text file collection</strong>.</p>
<p>I tried <a href="http://www.avajava.com/tutorials/lessons/how-do-i-use-lucene-to-index-and-search-text-files.html" rel="noreferrer">this example</a>, but is incompatible with the new ver... | 4,092,172 | 3 | 0 | null | 2010-11-03 20:36:41.607 UTC | 9 | 2015-11-27 09:47:58.927 UTC | 2011-08-08 22:11:04.413 UTC | null | 709,202 | null | 284,932 | null | 1 | 11 | java|indexing|lucene|text-files | 17,546 | <p>Lucene is a quite big topic with a lot of classes and methods to cover, and you normally cannot use it without understanding at least some basic concepts. If you need a quickly available service, use <a href="http://lucene.apache.org/solr/" rel="noreferrer">Solr</a> instead. If you need full control of Lucene, go on... |
4,264,540 | Grand Central Dispatch (GCD) with CoreData | <p>I'm using Grand Central Dispatch (GCD) in my application to do some heavy lifting. The application is using Core-Data for data storage purposes. Here's my scenario (along with relevant question):</p>
<pre><code>dispatch_queue_t main_queue = dispatch_get_main_queue();
dispatch_queue_t request_queue = dispatch_queue_... | 4,264,911 | 3 | 0 | null | 2010-11-24 07:55:02.77 UTC | 44 | 2012-08-20 14:13:23.603 UTC | 2011-09-16 00:06:02.79 UTC | user557219 | null | null | 49,739 | null | 1 | 22 | iphone|core-data|objective-c-blocks|grand-central-dispatch | 15,170 | <p>As you probably know or have noticed you must perform UI operations on the main thread. As you mention it is when you save the UI update takes place. You can solve this by nesting a call to <code>dispatch_sync</code> on the main thread.</p>
<pre><code>dispatch_queue_t main_queue = dispatch_get_main_queue();
dispatc... |
4,454,861 | How do I edit a table in order to enable CASCADE DELETE? | <p>I have a table representing users. When a user is deleted I get: </p>
<blockquote>
<p>DELETE statement conflicted with the REFERENCE constraint</p>
</blockquote>
<p>Apparently, <code>CASCADE DELETE</code> is not as easy as I imagined in SQL Server, and the option needs to be added to the table.</p>
<p>The probl... | 4,454,994 | 3 | 0 | null | 2010-12-15 21:03:45.227 UTC | 5 | 2016-03-09 08:46:09.177 UTC | 2015-10-20 10:18:05.677 UTC | null | 2,771,704 | null | 208,827 | null | 1 | 26 | sql|sql-server|sql-server-2008|cascading-deletes | 46,946 | <p>Read this Microsoft article first. <a href="http://msdn.microsoft.com/en-us/library/ms186973.aspx" rel="noreferrer">Read Me</a>. I use the GUI during design so here is a picture of how it is selected in SSMS.
<img src="https://i.stack.imgur.com/Y3cVQ.jpg" alt="alt text">
The syntax added to the foreign key is " ON ... |
4,483,972 | Only select text directly in node, not in child nodes | <p>How does one retrieve the text in a node without selecting the text in the children?</p>
<pre><code><div id="comment">
<div class="title">Editor's Description</div>
<div class="changed">Last updated: </div>
<br class="clear">
Lorem ipsum dolor sit amet.
</d... | 4,484,036 | 3 | 0 | null | 2010-12-19 16:50:23.633 UTC | 15 | 2019-04-15 17:14:46.967 UTC | 2019-04-15 17:14:46.967 UTC | user357812 | 81,785 | null | 81,785 | null | 1 | 47 | xpath|xquery | 27,412 | <p>In the provided XML document:</p>
<pre><code><div id="comment">
<div class="title">Editor's Description</div>
<div class="changed">Last updated: </div>
<br class="clear">
Lorem ipsum dolor sit amet.
</div>
</code></pre>
<p>the top element <code>/d... |
4,394,273 | What's the difference between update and pull? | <p>Can someone clarify what's the exact difference between <em>update</em> and <em>pull</em> commands?</p>
<p>Thanks.</p> | 4,394,287 | 4 | 2 | null | 2010-12-09 02:17:47.417 UTC | 10 | 2020-03-17 16:46:48.89 UTC | null | null | null | null | 504,715 | null | 1 | 37 | version-control|mercurial | 29,932 | <p>hg update : <a href="http://www.selenic.com/mercurial/hg.1.html#update" rel="noreferrer">http://www.selenic.com/mercurial/hg.1.html#update</a></p>
<ul>
<li>Update the repository's working directory (the "working copy") to the specified revision of the repository</li>
</ul>
<p>hg pull : <a href="http://www.selenic.... |
4,494,708 | Using CSS selectors to access specific table rows with selenium | <p>If I have the following HTML:</p>
<pre><code><tbody id="items">
<tr><td>Item 1</td></tr>
<tr><td>Item 2</td></tr>
<tr><td>Item 3</td></tr>
<tr><td>Item 4</td></tr>
<tr><td>Item 5</td></tr>
&... | 4,494,743 | 5 | 0 | null | 2010-12-20 22:42:04.713 UTC | 4 | 2018-11-01 15:18:11.67 UTC | null | null | null | null | 462,112 | null | 1 | 12 | css|selenium|css-selectors | 51,372 | <p>You can use nth-child selector:</p>
<pre><code>#items tr:nth-child(4) {color:#F00;}
</code></pre>
<p>Live example: <a href="https://jsfiddle.net/7ow15mv2/1/" rel="noreferrer">https://jsfiddle.net/7ow15mv2/1/</a></p>
<p>But no idea if it works with Selenium.</p>
<p>But according to docs it should.</p>
<blockquot... |
4,147,707 | Python - mysqlDB, sqlite result as dictionary | <p>When I do someting like</p>
<pre><code>sqlite.cursor.execute("SELECT * FROM foo")
result = sqlite.cursor.fetchone()
</code></pre>
<p>I think have to remember the order the columns appear to be able to fetch them out, eg</p>
<pre><code>result[0] is id
result[1] is first_name
</code></pre>
<p>is there a way to ret... | 4,147,752 | 5 | 1 | null | 2010-11-10 18:23:21.84 UTC | 13 | 2019-10-02 18:22:43.93 UTC | 2017-12-13 21:18:12.71 UTC | null | 42,223 | null | 133,498 | null | 1 | 22 | python|mysql|sqlite|dictionary|dataformat | 16,784 | <p>David Beazley has a nice example of this in his <a href="https://rads.stackoverflow.com/amzn/click/com/0672329786" rel="nofollow noreferrer" rel="nofollow noreferrer">Python Essential Reference</a>.<br>
I don't have the book at hand, but I think his example is something like this:</p>
<pre><code>def dict_gen(curs):... |
4,584,089 | What is the function of the push / pop instructions used on registers in x86 assembly? | <p>When reading about assembler I often come across people writing that they <em>push</em> a certain register of the processor and <em>pop</em> it again later to restore it's previous state.</p>
<ul>
<li>How can you push a register? Where is it pushed on? Why is this needed?</li>
<li>Does this boil down to a single pr... | 4,584,131 | 5 | 2 | null | 2011-01-03 11:36:03.06 UTC | 57 | 2022-02-06 12:35:51.933 UTC | 2021-12-12 06:31:06.167 UTC | null | 224,132 | null | 561,174 | null | 1 | 131 | assembly|x86|terminology|stack-memory|stack-pointer | 389,601 | <p><em>pushing</em> a value (not necessarily stored in a register) means writing it to the stack.</p>
<p><em>popping</em> means restoring whatever is on top of the stack <em>into</em> a register. Those are basic instructions:</p>
<pre><code>push 0xdeadbeef ; push a value to the stack
pop eax ; eax i... |
4,591,889 | Get default value of an input using jQuery | <pre><code>$(".box_yazi2").each(function () {
var default_value = this.value;
$(this).css('color', '#555'); // this could be in the style sheet instead
$(this).focus(function () {
if (this.value == default_value) {
this.value = '';
$(this).css('color', '#000');
}
... | 4,591,938 | 6 | 5 | null | 2011-01-04 08:50:34.367 UTC | 2 | 2016-03-18 15:27:00.623 UTC | 2015-01-23 14:08:42.943 UTC | null | 87,015 | null | 532,309 | null | 1 | 19 | javascript|jquery|html|input|default-value | 81,522 | <p>The solution is quite easy; you have an extra <code>});</code> in your code (thanks @ Box9).</p>
<p>I would encourage you to reuse the variable and not create dozens of jQuery objects.</p>
<p>I've changed your example to <code>background-color</code> but it will work.</p>
<pre><code>$('.box_yazi2').each(function(... |
4,726,768 | Function returning a lambda expression | <p>I wonder if it's possible to write a function that returns a lambda function in C++11. Of course one problem is how to declare such function. Each lambda has a type, but that type is not expressible in C++. I don't think this would work:</p>
<pre><code>auto retFun() -> decltype ([](int x) -> int)
{
return... | 4,727,021 | 6 | 6 | null | 2011-01-18 17:01:00.303 UTC | 27 | 2020-07-27 17:33:55.007 UTC | 2016-06-29 10:15:06.957 UTC | null | 3,919,155 | null | 90,088 | null | 1 | 101 | c++|function|c++11|lambda | 42,676 | <p>You don't need a handcrafted function object, just use <code>std::function</code>, to which lambda functions are convertible:</p>
<p>This example returns the integer identity function:</p>
<pre><code>std::function<int (int)> retFun() {
return [](int x) { return x; };
}
</code></pre> |
4,205,317 | Capture keyboardinterrupt in Python without try-except | <p>Is there some way in Python to capture <code>KeyboardInterrupt</code> event without putting all the code inside a <code>try</code>-<code>except</code> statement?</p>
<p>I want to cleanly exit without trace if user presses <kbd><strong>Ctrl</strong></kbd>+<kbd><strong>C</strong></kbd>.</p> | 4,205,386 | 6 | 0 | null | 2010-11-17 14:24:51.997 UTC | 40 | 2020-07-09 14:34:16.213 UTC | 2018-09-16 12:19:23.643 UTC | null | 3,702,377 | null | 483,265 | null | 1 | 115 | python|try-catch|keyboardinterrupt | 134,951 | <p>Yes, you can install an interrupt handler using the module <a href="https://docs.python.org/3/library/signal.html" rel="noreferrer">signal</a>, and wait forever using a <a href="https://docs.python.org/3/library/threading.html#threading.Event" rel="noreferrer">threading.Event</a>:</p>
<pre><code>import signal
impor... |
4,830,900 | How do I find the index of an item in a vector? | <p>Any ideas what <code>????</code> should be? Is there a built in?
What would be the best way to accomplish this task?</p>
<pre><code>(def v ["one" "two" "three" "two"])
(defn find-thing [ thing vectr ]
(????))
(find-thing "two" v) ; ? maybe 1, maybe '(1,3), actually probably a lazy-seq
</code></pre> | 4,831,043 | 9 | 2 | null | 2011-01-28 16:56:57.723 UTC | 17 | 2021-04-14 22:18:50.453 UTC | 2017-06-30 16:09:23.643 UTC | null | 254,837 | null | 254,837 | null | 1 | 90 | clojure | 63,679 | <p>Built-in:</p>
<pre><code>user> (def v ["one" "two" "three" "two"])
#'user/v
user> (.indexOf v "two")
1
user> (.indexOf v "foo")
-1
</code></pre>
<p>If you want a lazy seq of the indices for all matches:</p>
<pre><code>user> (map-indexed vector v)
([0 "one"] [1 "two"] [2 "three"] [3 "two"])
user> (f... |
4,674,623 | Why do we have to normalize the input for an artificial neural network? | <p>Why do we have to normalize the input for a neural network?</p>
<p>I understand that sometimes, when for example the input values are non-numerical a certain transformation must be performed, but when we have a numerical input? Why the numbers must be in a certain interval?</p>
<p>What will happen if the data is not... | 4,674,770 | 10 | 1 | null | 2011-01-12 22:16:11.363 UTC | 58 | 2021-02-20 00:04:37.75 UTC | 2021-02-20 00:04:37.75 UTC | null | 4,685,471 | null | 481,828 | null | 1 | 180 | machine-learning|neural-network|normalization | 129,801 | <p>It's explained well <a href="http://www.faqs.org/faqs/ai-faq/neural-nets/part2/" rel="noreferrer">here</a>.</p>
<blockquote>
<p>If the input variables are combined linearly, as in an MLP [multilayer perceptron], then it is
rarely strictly necessary to standardize the inputs, at least in theory. The
reason is ... |
14,729,475 | Can I make a Java HttpServer threaded/process requests in parallel? | <p>I have built a simple HttpServer following tutorials i have found online, using Sun's lightweight HttpServer.</p>
<p>Basically the main function looks like this:</p>
<pre><code>public static void main(String[] args) throws Exception {
HttpServer server = HttpServer.create(new InetSocketAddress(8000), 0);
... | 14,729,886 | 2 | 4 | null | 2013-02-06 12:47:35.233 UTC | 8 | 2019-02-25 13:55:37.787 UTC | null | null | null | null | 1,985,558 | null | 1 | 11 | java|httpserver | 18,754 | <p>As you can see in <a href="http://www.docjar.com/html/api/sun/net/httpserver/ServerImpl.java.html" rel="noreferrer">ServerImpl</a>, the default executor just "run" the task :</p>
<pre><code> 157 private static class DefaultExecutor implements Executor {
158 public void execute (Runnable task) {
... |
2,928,325 | What is the definition of a Service object? | <p>I've been working a lot with PHP.</p>
<p>But recently I was assigned some work which uses Java. In PHP I used to do a lot of Singleton object but this pattern has not the same signification in Java that it has in PHP.</p>
<p>So I wanted to go for an utility class (a class with static method) but my chief doesn't lik... | 2,928,521 | 2 | 0 | null | 2010-05-28 10:50:05.363 UTC | 10 | 2020-07-31 04:33:26.18 UTC | 2020-07-31 04:33:26.18 UTC | null | 214,143 | null | 352,808 | null | 1 | 31 | java|design-patterns|terminology | 16,473 | <p><a href="https://rads.stackoverflow.com/amzn/click/com/0321125215" rel="noreferrer" rel="nofollow noreferrer">Domain-Driven Design</a> defines a Service as:</p>
<blockquote>
<p>A SERVICE is an operation offered as an interface that stands alone in the model, without encapsulating state... [p. 105]</p>
</blockquot... |
3,156,778 | No matching function for call to operator new | <p>I'm trying to wrap a class from a library I'm using in Lua. Specifially, I'm trying to wrap the color class from SFML. The full source for the color class can be seen <a href="http://www.sfml-dev.org/documentation/1.6/Color_8cpp-source.htm" rel="noreferrer">here</a> and <a href="http://www.sfml-dev.org/documentation... | 3,156,822 | 2 | 1 | null | 2010-07-01 10:05:17.03 UTC | 5 | 2022-09-11 12:36:45.22 UTC | 2010-07-02 00:40:10.27 UTC | null | 63,791 | null | 63,791 | null | 1 | 43 | c++|new-operator | 17,998 | <p>To use the standard placement form of <code>new</code> you have to <code>#include <new></code>.</p>
<p>The form of <code>new</code> that you are using requires a declaration of <code>void* operator new(std::size_t, void*) throw();</code>.</p>
<p>You don't have to <code>#include <new></code> to use non-... |
1,504,261 | java override during object creation | <p>in the following java code a JButton is created but at the same time one of its methods gets overridden.
Qestion: is there a name for overriding in this way while creating the object?</p>
<p>the code:</p>
<pre><code> JButton myButton;
myButton = new JButton ("ok"){
@Override
public void setTe... | 1,504,271 | 1 | 0 | null | 2009-10-01 14:21:59.637 UTC | 9 | 2013-01-20 18:12:29.81 UTC | 2013-01-20 18:12:29.81 UTC | karl | 1,592,796 | karl | null | null | 1 | 20 | java|overriding|instantiation | 10,419 | <p>That's an anonymous class. From <a href="http://hell.org.ua/Docs/oreilly/javaenterprise/jnut/ch03_12.htm" rel="noreferrer">Java in a Nutshell</a></p>
<blockquote>
<p>An anonymous class is a local class
without a name. An anonymous class is
defined and instantiated in a single
succinct expression using the n... |
27,070,269 | Ripple effect for lollipop views | <p>I have been developing an app for Lollipop (API 21). </p>
<p>When I change the <code>Button</code> color to something, the ripple effect doesn't works. </p>
<p>I found some third party libraries for the ripple effect, but I want to do this with standard API. </p>
<p>This <a href="https://stackoverflow.com/questio... | 27,071,381 | 4 | 0 | null | 2014-11-21 21:00:51.427 UTC | 8 | 2016-10-04 16:01:35.2 UTC | 2017-05-23 11:53:49.037 UTC | null | -1 | null | 2,203,061 | null | 1 | 20 | android|material-design | 21,211 | <p>You have to set your button's background to a RippleDrawable which you can define in XML. (I'll name it <code>holo_blue_ripple.xml</code>)</p>
<pre><code><ripple xmlns:android="http://schemas.android.com/apk/res/android"
android:color="@android:color/white"> <!-- ripple color -->
<item andro... |
55,897,065 | Terraform: Validation error ... Member must satisfy regular expression pattern: arn:aws:iam:: | <p>I'm trying to stream rds through kinesis data stream but it is giving me this error:</p>
<blockquote>
<p>botocore.exceptions.ClientError: An error occurred
(ValidationException) when calling the PutRecord operation: 1
validation error detected: Value
'arn:aws:kinesis:us-west-2:xxxxxxxxxx:stream/rds-temp-lea... | 55,897,749 | 3 | 0 | null | 2019-04-29 04:41:59.203 UTC | 4 | 2021-10-04 02:04:11.137 UTC | 2021-10-04 02:04:11.137 UTC | null | 10,907,864 | null | 7,806,643 | null | 1 | 17 | python|amazon-rds|amazon-kinesis | 45,880 | <p>remove 'arn:aws:kinesis:us-west-2:xxxxxxxxxx:stream/rds-temp-leads-stream' this from stream name. Just put the name of stream there like "rds-temp-leads-stream"</p> |
38,717,543 | How do I filter date range in DataTables? | <p>I have a large dataTable which contains ride information. Every row has a start datetime and an end datetime of the following format(yyyy-mm-dd HH:mm:ss). How can I use a datepicker for setting a filter range in dataTables? I want to have a datepicker which only selects a day and not the time. I've searched everywhe... | 38,718,922 | 7 | 1 | null | 2016-08-02 10:09:34.07 UTC | 18 | 2021-02-16 22:17:12.76 UTC | 2016-08-02 11:15:03.953 UTC | null | 6,666,514 | null | 3,397,167 | null | 1 | 25 | javascript|datetime|filter|datatables | 145,973 | <p>Here is <code>DataTable</code> with Single <code>DatePicker</code> as "from" Date Filter</p>
<p><kbd><a href="http://plnkr.co/edit/8z7cojpJoCSJXRn9prNj?p=preview" rel="noreferrer">LiveDemo</a></kbd></p>
<p>Here is <code>DataTable</code> with Two <code>DatePickers</code> for DateRange (To and From) Filter</p>
<p><... |
27,768,033 | ui router - nested views with shared controller | <p>I have an abstract parent view that is meant to share a controller with its nested views.</p>
<pre><code>.state('edit', {
abstract: true,
url: '/home/edit/:id',
templateUrl: 'app/templates/editView.html',
controller: 'editController'
})
.state('edit.details', {
url: '/details',
templateUrl: ... | 27,768,108 | 4 | 0 | null | 2015-01-04 17:04:08.63 UTC | 13 | 2018-04-04 19:57:51.493 UTC | null | null | null | null | 2,124,351 | null | 1 | 32 | angularjs|angular-ui-router | 40,563 | <p>The issue here would be related to this Q & A: <a href="https://stackoverflow.com/q/27696612/1679310">How do I share $scope data between states in angularjs ui-router?</a>.</p>
<p>The way how to solve it is hidden in the:</p>
<h3><a href="https://github.com/angular/angular.js/wiki/Understanding-Scopes" rel="no... |
35,326,115 | Laravel5 how to pass array to view | <p>I am confuse as how to pass variable from controller to view. I know there is a lot about this already on stockoverflow but unable to find one that works, please point me in the right direction. Thank you. </p>
<p>CONTROLLER</p>
<pre><code> class StoreController extends Controller
{
public function index()
... | 35,326,267 | 9 | 0 | null | 2016-02-10 21:19:09.167 UTC | 4 | 2021-01-05 18:10:21.23 UTC | null | null | null | null | 1,975,187 | null | 1 | 19 | laravel | 75,008 | <pre><code>public function index()
{
$store = Store::all(); // got this from database model
return view('store')->with('store', $store);
}
</code></pre>
<p>You've three options in general. </p>
<ol>
<li><p><code>return view('store')->with('store', $store);</code> </p></li>
<li><p><code>return view('store'... |
29,401,626 | How do I return a reference to something inside a RefCell without breaking encapsulation? | <p>I have a struct that has inner mutability.</p>
<pre><code>use std::cell::RefCell;
struct MutableInterior {
hide_me: i32,
vec: Vec<i32>,
}
struct Foo {
//although not used in this particular snippet,
//the motivating problem uses interior mutability
//via RefCell.
interior: RefCell<... | 29,401,865 | 3 | 0 | null | 2015-04-01 22:02:00.03 UTC | 14 | 2018-12-18 17:54:46.987 UTC | 2018-12-18 17:54:46.987 UTC | null | 493,729 | null | 116,834 | null | 1 | 48 | rust|encapsulation|contravariance|mutability|interior-mutability | 9,555 | <p>You can create a new struct similar to the <code>Ref<'a,T></code> guard returned by <code>RefCell::borrow()</code>, in order to wrap this <code>Ref</code> and avoid having it going out of scope, like this:</p>
<pre><code>use std::cell::Ref;
struct FooGuard<'a> {
guard: Ref<'a, MutableInterior>... |
45,163,256 | How to format numbers as percentage values in JavaScript? | <p>Was using ExtJS for formatting numbers to percentage earlier. Now as we are not using ExtJS anymore same has to be accomplished using normal JavaScript.</p>
<p>Need a method that will take number and format (usually in %) and convert that number to that format. </p>
<pre><code>0 -> 0.00% = 0.00%
25 -> 0.00% ... | 45,163,358 | 6 | 0 | null | 2017-07-18 09:52:22.36 UTC | 4 | 2022-01-05 20:50:40.113 UTC | null | null | null | null | 2,160,616 | null | 1 | 37 | javascript | 71,708 | <p>Here is what you need.</p>
<p><div class="snippet" data-lang="js" data-hide="false" data-console="true" data-babel="false">
<div class="snippet-code">
<pre class="snippet-code-js lang-js prettyprint-override"><code>var x=150;
console.log(parseFloat(x).toFixed(2)+"%");
x=0;
console.log(parseFloat(x).toFixed(2)+"%");
... |
64,500,342 | Creating requirements.txt in pip compatible format in a conda virtual environment | <p>I have created a conda virtual environment on a Windows 10 PC to work on a project. To install the required packages and dependencies, I am using <code>conda install <package></code> instead of <code>pip install <package></code> as per the best practices mentioned in <a href="https://docs.conda.io/projec... | 64,501,566 | 2 | 0 | null | 2020-10-23 12:48:45.99 UTC | 8 | 2022-08-05 15:22:49.747 UTC | 2020-10-23 13:14:08.167 UTC | null | 14,477,880 | null | 14,477,880 | null | 1 | 9 | python|pip|conda|requirements.txt | 18,217 | <p>The best solution I've found for the above is the combination I will describe below. For <code>conda</code>, I would first export the environment list as <code>environment.yml</code> and omit the package build numbers, which is often what makes it hard to reproduce the environment on another OS:</p>
<pre><code>conda... |
32,087,809 | How to change bottom layout constraint in iOS, Swift | <p>I have scroll view as @IBOutlet</p>
<pre><code>@IBOutlet weak var mainScrollView: UIScrollView!
</code></pre>
<p>I want to change the </p>
<pre><code>"Bottom space to: Bottom Layout Guide"
</code></pre>
<p>constraint programmatically.</p>
<pre><code>First Item : Bottom Layout Guide.Top
Relation : Equal
Second ... | 32,087,869 | 3 | 0 | null | 2015-08-19 06:17:08.007 UTC | 8 | 2015-08-19 06:30:10.117 UTC | null | null | null | null | 4,582,207 | null | 1 | 18 | ios|xcode|swift|storyboard|nslayoutconstraint | 38,768 | <p>Take the constraint as <code>IBOutlet</code> of <code>NSLayoutConstraint</code>.</p>
<p><img src="https://i.stack.imgur.com/gtitj.png" alt="enter image description here"></p>
<p>Set the constraint outlets and change <code>constant</code> value by :</p>
<pre><code>self.sampleConstraint.constant = 20
self.view.layo... |
27,945,031 | OpenID Connect delegation with Google now that they are deprecating their OpenID2 provider? | <p>For years I have used OpenID delegation to log in to Stack Overflow (among other sites) using my own URI as OpenID but having Google handle the authentication. I use the technique described in <a href="https://stackoverflow.com/questions/2541526/delegate-openid-to-google-not-google-apps">this Stack Overflow questio... | 28,054,173 | 3 | 0 | null | 2015-01-14 14:15:53.307 UTC | 6 | 2015-01-21 04:01:03.407 UTC | 2017-05-23 12:06:46.683 UTC | null | -1 | null | 394,431 | null | 1 | 32 | openid|google-openid|openid-connect|stackexchange | 2,072 | <p>OpenID Connect <em>only</em> supports Discovery that is meant to <strong>find</strong> your Provider based on some hint you give it (e-mail, account, URL, domain etc.); it won't give you a persistent identifier for which you can <strong>delegate</strong> authentication to a configurable Provider of your choice.</p>
... |
40,358,434 | TypeScript TS7015: Element implicitly has an 'any' type because index expression is not of type 'number' | <p>Im getting this compilation error in my Angular 2 app:</p>
<blockquote>
<p>TS7015: Element implicitly has an 'any' type because index expression is not of type 'number'.</p>
</blockquote>
<p>The piece of code causing it is:</p>
<pre><code>getApplicationCount(state:string) {
return this.applicationsByState[state]... | 40,358,512 | 5 | 2 | null | 2016-11-01 10:40:55.9 UTC | 16 | 2022-05-05 07:29:14.697 UTC | 2021-10-14 09:31:57.67 UTC | null | 209,259 | null | 69,349 | null | 1 | 135 | javascript|angular|typescript | 210,492 | <p>If you want a key/value data structure then don't use an array.</p>
<p>You can use a regular object:</p>
<pre><code>private applicationsByState: { [key: string]: any[] } = {};
getApplicationCount(state: string) {
return this.applicationsByState[state] ? this.applicationsByState[state].length : 0;
}
</code></p... |
40,484,717 | PrimeNG dropdown hidden by dialog | <p>I have an Angular2 app using PrimeNG components.</p>
<p>I want a dropdown inside a dialog box. However, when i have implemented this, the dropdown is cut off by the limit of the dialog box as shown in the screenshot below. What i want is for it to display above the dialog and have all the options visible. </p>
<p>... | 42,930,704 | 6 | 3 | null | 2016-11-08 10:36:20.66 UTC | 7 | 2021-07-05 20:20:31.833 UTC | 2021-07-05 20:20:31.833 UTC | null | 1,077,309 | null | 2,858,948 | null | 1 | 31 | angular|typescript|primeng|primeng-dropdowns|primeng-dialog | 38,547 | <p>It is necessary to add an attribute <code>appendTo</code>.</p>
<p>e.g.</p>
<pre><code><p-dropdown appendTo="body" [options]="tables" [(ngModel)]="selectedTable" [style]="{width: '100%'}"></p-dropdown>
</code></pre> |
39,194,917 | How to use Laravel Passport with a custom username column | <p>Now I'm using something like that for authenticating the user on my base site:</p>
<pre><code>if (Auth::attempt($request->only(['id', 'password']))) {
//
}
</code></pre>
<p>How can I modify this code for using custom column as username?
<a href="https://laravel.com/docs/5.3/passport#password-grant-t... | 39,194,932 | 2 | 0 | null | 2016-08-28 19:18:05.89 UTC | 9 | 2021-02-24 05:20:53.383 UTC | 2018-02-19 17:24:29.467 UTC | null | 100,297 | null | 4,417,142 | null | 1 | 45 | php|laravel|oauth-2.0|laravel-passport | 23,296 | <p>You can use findForPassport method in your user model.</p>
<p>This method take username as argument, and return user model</p>
<p>For example:</p>
<pre><code>class User extends Authenticatable
{
use HasApiTokens, Notifiable;
// ... some code
public function findForPassport($username) {
retur... |
6,255,796 | What does the 'N' command do in sed? | <p>It looks like the 'N' command works on every other line:</p>
<pre class="lang-sh prettyprint-override"><code>$ cat in.txt
a
b
c
d
$ sed '=;N' in.txt
1
a
b
3
c
d
</code></pre>
<p>Maybe that would be natural because command 'N' joins the next line and changes the current line number. But (I saw this <a href=... | 6,257,542 | 1 | 0 | null | 2011-06-06 17:33:17.13 UTC | 7 | 2021-07-10 10:53:39.303 UTC | 2021-07-10 10:53:39.303 UTC | null | 11,407,695 | null | 766,330 | null | 1 | 18 | sed | 43,120 | <p>Excerpt from <code>info sed</code>: </p>
<pre><code>`sed' operates by performing the following cycle on each lines of
input: first, `sed' reads one line from the input stream, removes any
trailing newline, and places it in the pattern space. Then commands
are executed; each command can have an address associated ... |
38,034,049 | is optionality (mandatory, optional) and participation (total, partial) are same? | <p>As i know optionality means the minimum cardinality of a relationship which is denoted as optional to optional, mandatory to optional, mandatory to mandatory.. </p>
<p>And Participation denoted as bold line and a normal line. </p>
<p>In the Internet some refer participation as the dependency of the entity to the r... | 38,035,173 | 1 | 0 | null | 2016-06-26 00:07:17.293 UTC | 12 | 2021-01-27 10:46:41.073 UTC | null | null | null | null | 5,719,870 | null | 1 | 13 | entity-relationship | 31,315 | <p>Let's start with definitions and examples of each of the concepts:</p>
<p><strong>Total and partial participation:</strong></p>
<p>Total participation (indicated by a double or thick association line) means that all the entities in an entity set must participate in the relationship. Partial participation (indicate... |
28,794,089 | Calling a Swift class factory method with leading dot notation? | <p>In a recent question, the poster had this interesting line of code:</p>
<pre><code>self.view.backgroundColor = .whiteColor()
</code></pre>
<p>I was surprised to see this. I've only ever seen the <em>leading dot</em> notation used for enum values. In this case, <code>backgroundColor</code> is of type <code>UIColo... | 28,808,977 | 3 | 0 | null | 2015-03-01 13:31:00.407 UTC | 9 | 2020-07-14 10:53:14.557 UTC | null | null | null | null | 1,630,618 | null | 1 | 41 | swift | 12,355 | <p>This <strong>feature</strong> is called "<a href="https://docs.swift.org/swift-book/ReferenceManual/Expressions.html#ID394" rel="noreferrer">Implicit Member Expression</a>"</p>
<blockquote>
<p>An implicit member expression is an abbreviated way to access a member of a type, such as an enumeration case <str... |
23,874,281 | Scala - How to compile code from an external file at runtime? | <p>I want to design a Scala program that accepts Scala files as parameters which can customize the execution of the program. In particular, I want to supply at runtime files that contain implementations of methods that will be invoked by the program. How can I properly depend on external files and invoke their method... | 23,879,115 | 2 | 0 | null | 2014-05-26 16:24:52.813 UTC | 12 | 2014-05-27 16:24:53.05 UTC | 2014-05-27 00:11:59.583 UTC | null | 1,763,356 | null | 506,971 | null | 1 | 14 | scala|scala-compiler|external-dependencies | 4,912 | <p>Here's how to do it using only standard Scala. The non-obvious stuff is all in <code>GreenhouseFactory</code>:</p>
<pre><code>package customizable
abstract class Plant
case class Rose() extends Plant
abstract class Greenhouse {
def getPlant(): Plant
}
case class GreenhouseFactory(implFilename: String) {
imp... |
43,166,214 | Merging http observables using forkjoin | <p>I'm trying to avoid nested observables by using <code>forkjoin</code>. The current (nested) version looks like this:</p>
<pre><code> this.http.get('https://testdb1.firebaseio.com/.json').map(res => res.json()).subscribe(data_changes => {
this.http.get('https://testdb2.firebaseio.com/.json').map(res =>... | 43,166,302 | 1 | 0 | null | 2017-04-02 08:24:45.97 UTC | 15 | 2017-10-24 10:08:33.14 UTC | null | null | null | null | 2,278,894 | null | 1 | 29 | angular|typescript|ionic2|observable | 30,028 | <p>Try to use <code>combineLatest</code> instead of <code>forkJoin</code> :</p>
<p><strong>With <code>combineLatest</code> :</strong></p>
<pre><code>const combined = Observable.combineLatest(
this.http.get('https://testdb1.firebaseio.com/.json').map((res: Response) => res.json()),
this.http.get('https://testdb... |
35,969,728 | How to change TODO highlight in atom editor | <p>In my opinion the higlighting of a TODO "flag" in the atom editor is too weak/unobtrusively.</p>
<p>How can I change this? I DON'T wanna list the todos in a sidebar (<a href="https://atom.io/packages/todo-show" rel="noreferrer">https://atom.io/packages/todo-show</a>).</p>
<p>Here to compare:</p>
<p>In Vim editor ... | 36,200,468 | 1 | 0 | null | 2016-03-13 11:35:32.547 UTC | 8 | 2019-08-06 06:50:21.973 UTC | 2016-03-17 19:34:40.287 UTC | null | 2,518,200 | null | 3,567,888 | null | 1 | 13 | editor|highlight|atom-editor|todo | 5,360 | <p>As GitHub's Atom Editor is built around HTML5 and CSS3 you can very easily change your style sheet, I've done a little recording on how to make this specific change below although you can apply the same principals to any styled element within the editor:</p>
<p><a href="https://i.stack.imgur.com/QJcdp.gif" rel="nor... |
36,188,429 | Retrieve length of slice from slice object in Python | <p>The title explains itself, how to get 2 out of the object</p>
<pre><code>slice(0,2)
</code></pre>
<p>The documentation is somewhat confusing, or it is the wrong one</p>
<p><a href="https://docs.python.org/2/c-api/slice.html" rel="noreferrer">https://docs.python.org/2/c-api/slice.html</a></p>
<p>In particular I d... | 36,188,683 | 7 | 0 | null | 2016-03-23 20:50:01.863 UTC | 3 | 2022-04-03 15:38:24.017 UTC | null | null | null | null | 5,748,462 | null | 1 | 30 | python|list|slice | 14,073 | <p>There is no complete answer for this. <code>slice</code> doesn't give you a length because the length of the result is always dependent on the size of the sequence being sliced, a short sequence (including an empty sequence) will produce fewer items, and if the <code>slice</code> is unbounded, then the length will g... |
56,895,273 | How to use `GlobalKey` to maintain widgets' states when changing parents? | <p>In Emily Fortuna's article (and video) she mentions:</p>
<blockquote>
<p>GlobalKeys have two uses: they allow widgets to change parents
anywhere in your app without losing state, or they can be used to
access information about another widget in a completely different part
of the widget tree. An example of t... | 62,226,807 | 3 | 0 | null | 2019-07-05 00:23:32.757 UTC | 16 | 2021-05-26 15:00:05.797 UTC | 2019-07-05 00:30:58.163 UTC | null | 1,032,613 | null | 1,032,613 | null | 1 | 39 | flutter | 71,375 | <p><strong>I would not recommend using GlobalKey for this task.</strong></p>
<p>You should pass the data around, not the widget, not the widget state. For example, if you want a <code>Switch</code> and a <code>Slider</code> like in the demo, you are better off just pass the actual <code>boolean</code> and <code>double... |
21,129,699 | How does Symfony2 session fixation work? | <p>According to the standard 2.4 documentation, the security.yml config file allows for the following configuration option:</p>
<pre><code>session_fixation_strategy: none | migrate | invalidate
</code></pre>
<p>source: <a href="http://symfony.com/doc/current/reference/configuration/security.html">http://symfony.com/d... | 23,952,177 | 1 | 0 | null | 2014-01-15 05:24:30.403 UTC | 8 | 2014-05-30 10:15:28.473 UTC | null | null | null | null | 1,155,721 | null | 1 | 20 | security|symfony | 4,845 | <p>In short:</p>
<ul>
<li>NONE: the session is not changed </li>
<li>MIGRATE: the session id is updated, attributes are kept </li>
<li>INVALIDATE: the session id is updated, attributes are lost</li>
</ul>
<p>In detail: </p>
<ol>
<li><p>None strategy:
Nothing is (supposed to be) done in the default session implement... |
43,567,577 | What is the different between force push and normal push in git | <p>I want to know what is the different between force push and normal push and at what kind of situations i should do force push in git?Is it a good practice to do force push into master branch?</p> | 43,567,591 | 2 | 0 | null | 2017-04-23 05:02:58.17 UTC | 9 | 2017-04-23 05:17:17.47 UTC | null | null | null | null | 7,764,309 | null | 1 | 33 | git|push | 28,252 | <p>You only force a push when you need to replace the remote history by your local history.</p>
<p>This happens when you rewrite the local history, typically <a href="https://git-scm.com/book/es-ni/v1/Git-Branching-Rebasing" rel="noreferrer">through a <code>git rebase</code></a>.<br>
For instance, if you just pushed a... |
49,572,786 | Bootstrap 4 datepicker | <p>I want to use datepicker <a href="https://bootstrap-datepicker.readthedocs.io/en/latest/index.html" rel="noreferrer">https://bootstrap-datepicker.readthedocs.io/en/latest/index.html</a> with Bootstrap 4.</p>
<p>Following the examples on above page, I can make it work with Bootstrap 3.</p>
<p><div class="snippet" d... | 49,586,564 | 3 | 1 | null | 2018-03-30 10:31:00.94 UTC | 4 | 2020-06-11 05:51:29.953 UTC | null | null | null | null | 184,041 | null | 1 | 14 | datepicker|bootstrap-4|bootstrap-datepicker | 109,113 | <p>You can too override default datepicker classes like the following:</p>
<p>the default bootstrap font size is 1rem or 16px so update .datepicker class
<code>font-size: 0.875em;</code> or/and update the cell width and height:</p>
<pre><code>.datepicker td, .datepicker th {
width: 1.5em;
height: 1.5em;
}
</... |
26,132,451 | How to add bash command completion for Docker on Mac OS X? | <p>I am running docker and I want <code>bash</code> command completion for <code>docker</code> commands and parameters.</p> | 26,132,452 | 8 | 0 | null | 2014-10-01 00:46:02.59 UTC | 10 | 2020-07-27 01:02:40.093 UTC | 2014-10-01 00:53:03.643 UTC | null | 2,297,345 | null | 2,297,345 | null | 1 | 54 | macos|docker | 21,920 | <p>If you have already <a href="http://brew.sh" rel="noreferrer">homebrew</a> <code>bash-completion</code> <a href="https://superuser.com/a/288491/231893">installed</a> just install the docker completion script into the <code>bash_completion.d</code> </p>
<pre><code>curl -XGET https://raw.githubusercontent.com/docker/... |
26,005,641 | Are cookies in UIWebView accepted? | <p>I have to question for you.</p>
<p>1 : I'm using <code>UIWebView</code>s in my iPhone App. I wan't the users be able to add comments in the news. But, to comment they have to log-in. </p>
<p>If not, how can I accept cookies in <code>UIWebView</code>s ?</p>
<p>2 : Are the cookies created in on <code>UIWebView</cod... | 26,006,163 | 8 | 0 | null | 2014-09-23 22:23:03.543 UTC | 10 | 2019-01-20 11:58:11.467 UTC | 2017-07-17 08:14:15.563 UTC | null | 7,456,236 | null | 4,059,455 | null | 1 | 17 | ios|objective-c|iphone|cookies|uiwebview | 32,161 | <p>The <code>UIWebView</code> will automatically store the cookies in the <code>[NSHTTPCookieStorage sharedHTTPCookieStorage]</code> collection, and should be available in all other <code>UIWebView</code>s within your app, during the same app launch. However the <code>UIWebView</code> class does not automatically store... |
26,275,736 | How to pass a Map<String, String> with application.properties | <p>I have implemented some authorization in a webservice that needs be configured.</p>
<p>Currently the user/password combo is hardcoded into the bean configuration. I would like to configure the map with users and passwords into the application.properties so the configuration can be external.</p>
<p>Any clue on how ... | 26,276,729 | 4 | 0 | null | 2014-10-09 10:10:04.447 UTC | 10 | 2019-11-21 16:51:07.297 UTC | 2019-11-21 16:51:07.297 UTC | null | 117,347 | null | 185,432 | null | 1 | 26 | spring|spring-boot | 93,871 | <p>A <a href="http://docs.oracle.com/javase/7/docs/api/java/util/Properties.html" rel="noreferrer"><code>java.util.Properties</code></a> object is already a <code>Map</code>, actually a <code>HashTable</code> which in turn implements <code>Map</code>.</p>
<p>So when you create a properties file (lets name it <code>use... |
41,998,222 | Best practice for handling error in Angular2 | <p>Hi i am trying to receive error sent from catch block (service).
in multiple components i need to show a popup with the error message displayed.
please let me know how to create a generic method and call it inside service block. Like what i am doing now with "showErrorPage()".</p>
<pre><code>import { Injectable }... | 41,999,180 | 1 | 0 | null | 2017-02-02 09:14:24.853 UTC | 12 | 2017-10-10 11:58:59.857 UTC | null | null | null | null | 1,867,584 | null | 1 | 27 | angular|angular2-services | 28,887 | <p>According to the <a href="https://angular.io/guide/styleguide#style-08-01" rel="noreferrer">angular style guide</a></p>
<blockquote>
<p>The details of data management, such as headers, HTTP methods, caching, error handling, and retry logic, are irrelevant to components and other data consumers.</p>
</blockquote>
... |
21,979,782 | How to push values to property array in Cypher? | <p>I have two nodes <code>user</code> and <code>files</code> with a relationship <code>:contains</code>, the relationship has a property <code>id</code>which is an array, represented as</p>
<pre><code>(:user)-[:contains{id:[12345]}]->(:files)
</code></pre>
<p>However I want to populate the property array <code>id</c... | 21,980,719 | 3 | 0 | null | 2014-02-24 05:45:07.333 UTC | 9 | 2021-12-10 03:45:48.82 UTC | 2021-12-10 03:45:48.82 UTC | null | 3,416,774 | null | 2,472,111 | null | 1 | 30 | arrays|neo4j|cypher | 17,436 | <p>Adding values to an array is analogous to incrementing an integer or concatenating a string and is signified the same way, in your case (let <code>c</code> be your <code>[c:contains {id:[12345]}]</code>)</p>
<pre><code>c.id = c.id + 1111 // [12345,1111]
c.id = c.id + 14567 // [12345,1111,14... |
3,089,475 | How Can I create A 5 second Countdown timer with jquery that ends with a login popup? | <p>How would i create a jquery timer that starts when a link is 'mouse-overed', Displays a 1,2,3, 4 and 5, one after the other. Then on 5 pops up a login box?</p>
<p>Cheers.</p> | 3,089,490 | 3 | 0 | null | 2010-06-22 00:48:29.21 UTC | 16 | 2017-09-26 19:48:54.503 UTC | null | null | null | null | 276,809 | null | 1 | 34 | jquery | 82,744 | <p>How about:</p>
<pre><code>var counter = 0;
var interval = setInterval(function() {
counter++;
// Display 'counter' wherever you want to display it.
if (counter == 5) {
// Display a login box
clearInterval(interval);
}
}, 1000);
</code></pre> |
2,413,427 | How to use SQL Order By statement to sort results case insensitive? | <p>I have a SQLite database that I am trying to sort by Alphabetical order. The problem is, SQLite doesn't seem to consider A=a during sorting, thus I get results like this:</p>
<p>A
B
C
T
a
b
c
g</p>
<p>I want to get:</p>
<p>A
a
b
B
C
c
g
T</p>
<p>What special SQL thing needs to be done that I don't know about?</... | 2,413,833 | 3 | 1 | null | 2010-03-09 23:30:55.843 UTC | 26 | 2020-04-26 23:13:23.79 UTC | null | null | null | null | 131,871 | null | 1 | 157 | sql|sqlite|sorting|sql-order-by | 118,583 | <p>You can also do <code>ORDER BY TITLE COLLATE NOCASE</code>.</p>
<p>Edit: If you need to specify <code>ASC</code> or <code>DESC</code>, add this after <code>NOCASE</code> like</p>
<pre><code>ORDER BY TITLE COLLATE NOCASE ASC
</code></pre>
<p>or</p>
<pre><code>ORDER BY TITLE COLLATE NOCASE DESC
</code></pre> |
13,129,805 | MatLab algorithm for composite Simpson's rule | <p>I have tried, just for the fun of it, to write a MatLab-code for the composite Simpson's rule. As far as I can see, the code is correct, but my answers are not as accurate as I would like. If I try my code on the function f = cos(x) + e^(x^2), with a = 0, b = 1 and n = 7, my answer is roughly 1,9, when it should b... | 13,129,903 | 4 | 0 | null | 2012-10-29 21:15:24.643 UTC | 2 | 2017-05-02 13:14:24.133 UTC | 2012-10-29 21:41:12.13 UTC | null | 933,410 | null | 933,410 | null | 1 | 0 | matlab|numerical-integration | 52,714 | <p>Your interval <code>[a,b]</code> should be split into <code>n</code> intervals. This results in <code>n+1</code> values for <code>x</code> that form the boundary of each partition. Your vector <code>x</code> contains only <code>n</code> elements. It appears that your code is only dealing with <code>n</code> terms in... |
40,635,107 | Why does unique_ptr instantiation compile to larger binary than raw pointer? | <p>I was always under the impression that a <code>std::unique_ptr</code> had no overhead compared to using a raw pointer. However, compiling the following code</p>
<pre><code>#include <memory>
void raw_pointer() {
int* p = new int[100];
delete[] p;
}
void smart_pointer() {
auto p = std::make_unique<in... | 40,635,268 | 1 | 7 | null | 2016-11-16 14:49:01.423 UTC | 3 | 2016-11-17 13:11:07.22 UTC | null | null | null | null | 4,089,452 | null | 1 | 39 | c++|assembly|smart-pointers | 1,424 | <p>Because <code>std::make_unique<int[]>(100)</code> performs <a href="http://en.cppreference.com/w/cpp/language/value_initialization" rel="nofollow noreferrer">value initialization</a> while <code>new int[100]</code> performs <a href="http://en.cppreference.com/w/cpp/language/default_initialization" rel="nofollo... |
37,149,466 | Axios spread() with unknown number of callback parameters | <p>I need to process an unknown number of AJAX requests (1 or more) with axios, and I am not sure how to handle the response. I want something along the lines of:</p>
<pre><code>let urlArray = [] // unknown # of urls (1 or more)
axios.all(urlArray)
.then(axios.spread(function () {
let temp = [];
for (let i = 0; i... | 37,149,547 | 1 | 0 | null | 2016-05-10 21:42:32.257 UTC | 10 | 2016-05-10 22:22:19.353 UTC | 2016-05-10 22:22:19.353 UTC | user6246005 | null | null | 3,606,440 | null | 1 | 22 | javascript|ajax|axios | 19,930 | <p>You somewhere will need to make the actual requests. And then don't use <code>spread</code> but only <code>then</code> to receive the array of results:</p>
<pre><code>let urlArray = [] // unknown # of urls (1 or more)
let promiseArray = urlArray.map(url => axios.get(url)); // or whatever
axios.all(promiseArray)... |
52,785,125 | MySQL Workbench: Error in query (1064): Syntax error near 'VISIBLE' at line 1 | <p>Any ideas why <code>VISIBLE</code> below is causing an issue?</p>
<pre><code>CREATE TABLE IF NOT EXISTS `setting` (
`uuid` INT(10) NOT NULL,
`type` VARCHAR(255) NOT NULL,
`code` VARCHAR(255) NOT NULL COMMENT 'An unique name.',
`value` MEDIUMTEXT NULL DEFAULT NULL,
`comment` LONGTEXT NULL DEFAULT NULL,
`... | 52,785,302 | 3 | 0 | null | 2018-10-12 18:22:48.95 UTC | 4 | 2019-04-28 06:16:05.397 UTC | null | null | null | null | 413,225 | null | 1 | 34 | mysql|mysql-workbench | 20,358 | <p>The problem here is the difference in syntax across different MySQL server versions. It seems that <strong>MySQL Workbench 8.0.12</strong> is auto-generating <code>CREATE UNIQUE INDEX</code> statement for the MySQL server <strong>version 8.0</strong>.</p>
<p>From the <a href="https://dev.mysql.com/doc/refman/8.0/en... |
3,072,205 | How to use Maven in my Java Project and Why? | <p>I am trying to figure out the use of <a href="http://maven.apache.org/" rel="noreferrer">Maven</a> and I got many articles describing its features and uses. But I am just not able to understand the actual use of Maven from productivity standpoint. </p>
<p>From what I am used to in our school projects was just creat... | 3,072,246 | 7 | 1 | null | 2010-06-18 18:30:42.253 UTC | 13 | 2020-12-31 18:14:14.473 UTC | 2012-11-11 22:07:42.507 UTC | null | 231,917 | null | 231,917 | null | 1 | 20 | java|maven-2 | 14,857 | <p>Maven is used to manage the build, testing, and deployment processes. It can separate the unit tests and integration tests so you only run them when necessary and cut down on build time. </p>
<p>It is also a <em>dependency manager</em>, which means when you realize the server piece of your project needs <code>apach... |
3,058,164 | Android: Scrolling an Imageview | <p>I have an ImageView that is twice the height of a normale screen ( 960 dip). I would like to scroll it nicely up and down on the screen. The bottom of the screen should contain a button. I have tried various combinations of ScrollView and Imageviews without any success. I have also thinkered with the :isScrollContai... | 3,732,377 | 8 | 1 | null | 2010-06-17 00:36:39.923 UTC | 41 | 2019-11-04 12:45:17.183 UTC | 2011-08-15 21:01:55.883 UTC | null | 156,771 | null | 368,819 | null | 1 | 26 | android|scroll|imageview | 97,959 | <p>@cV2 Thank you so much for that code. It got me going in the direction I needed. Here's my modified version which stops scrolling at the edges of the image...</p>
<pre><code> // set maximum scroll amount (based on center of image)
int maxX = (int)((bitmapWidth / 2) - (screenWidth / 2));
int maxY = (int... |
2,929,175 | What is the difference between a static class and a normal class? | <p>When should I prefer either a static or a normal class? Or: what is the difference between them?</p>
<pre><code>using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace staticmethodlar
{
class Program
{
static void Main(string[] args)
{
Sin... | 2,929,251 | 9 | 2 | null | 2010-05-28 13:06:57.447 UTC | 12 | 2020-12-14 16:35:21.007 UTC | 2015-06-04 06:21:54.18 UTC | null | 419,956 | null | 52,420 | null | 1 | 21 | c#|.net|oop | 40,538 | <p>Static classes contain static objects that can't be instantiated multiple times. Usually what I use static classes for are to house static methods that provide calculations, general processing patterns, string output formats, etc. Static classes are light weight and don't need instantiation.</p>
<p>For instance <co... |
2,603,363 | Good Form Security - no CAPTCHA | <p>Is there a good method of form security that does <code>not</code> involve CAPTCHA? CAPTCHA is so annoying, but I need security because I am getting form spam. My form is PHP.</p> | 2,603,377 | 9 | 0 | null | 2010-04-08 20:49:32.667 UTC | 10 | 2019-07-22 07:10:33.037 UTC | null | null | null | null | 290,051 | null | 1 | 35 | php|security|forms | 10,206 | <p>Try <a href="http://akismet.com/" rel="nofollow noreferrer">akismet</a>. It's great at flagging spam. The API is easy to use and completely transparent to your users.</p> |
3,200,329 | View AJAX response content in Chrome developer tools? | <p>Traditionally I use FireBug to debug my AJAX requests. It lets you examine both the contents of your request as well as the response that was sent back from the server. (it also notifies you in the console when these occur, which is a useful feature that Chrome seems to lack).</p>
<p>In Chrome, I only seem to be ab... | 3,205,078 | 9 | 3 | null | 2010-07-08 02:33:09.927 UTC | 13 | 2022-01-31 07:53:13.473 UTC | 2010-07-08 02:40:52.453 UTC | null | 134,658 | null | 134,658 | null | 1 | 55 | ajax|google-chrome|webkit|developer-tools|web-developer-toolbar | 80,045 | <p>The content of ajax responses is not visible yet if the request is generated by a plugin.
There is some chance that this problem will be fixed soon.</p> |
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