text stringlengths 1 1.11k | source dict |
|---|---|
python, python-3.x, game
if __name__ == '__main__':
login_attempt = login()
if login_attempt != False:
user_ID = login_attempt[-1]
instance_variable = Shop(user_ID)
else:
print("Log-in failed.") | {
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homework-and-exercises, newtonian-mechanics, kinematics, momentum, friction
You can use Newton’s second law $F=ma$ to find the horizontal acceleration. | {
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"tags": "homework-and-exercises, newtonian-mechanics, kinematics, momentum, friction",
"u... |
Let the orange circle be $X$. Let the four circles immediately adjacent to $X$ be $A,B,C,D$ so that $A+X + C = B+X+D = 18$. You can label the rest of the circles what you wish.
===
Notice that $A,B,C,D$ are all involved in $3$ sums. And these are the only four circles that are involved in that many sums.
Claim: the ... | {
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"openwebmath_score": 0.7626401782035828,
"tag... |
showed up in our integration by parts in (1. >TayPlot (exp (x),x=0, {4},x=-4. Approximating functions by Taylor Polynomials. We can use the first few terms of a Taylor Series to get an approximate value for a function. A tutorial on function approximation using Taylor Polynomials in Python. 2 Note: In general, the high... | {
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"lm_q2_score": 0.822189123986562,
"openwebmath_perplexity": 471.5452330643302,
"openwebmath_score": 0.874197244644165,
"tags": null... |
rviz
Originally posted by Airuno2L with karma: 3460 on 2017-07-21
This answer was ACCEPTED on the original site
Post score: 0 | {
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"tags": "rviz",
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} |
given by Patrick. The center is at a distance ( = R) from a point on its circumference. Two points give you two equations. Finally, the tangent is basically a line that is at a distance (= R) from the centre of circle. In the current case, the tangent was X=0, which simplified things. Usually, that will not be the case... | {
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completely determines L(x) for any vector xin R3. Interactive: A 3 × 2 matrix: reprise. I will add an example of how to do this in the next release of the Real Statistics software. The domain of T is R n , where n is the number of columns of A. The Matrix of a Linear Transformation We have seen that any matrix transfor... | {
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c++, interview-questions
Similarly, it may be worth eliminating impossible words from the get go. Since you can't reuse any board cell within a given word, doing a quick count of the number of occurrences of each character on the board and comparing it to a quick count for each word would eliminate the words that cann... | {
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} |
c#, winforms, wpf, rubberduck
public BitmapImage this[Declaration declaration]
{
get
{
var key = Tuple.Create(declaration.DeclarationType, declaration.Accessibility);
return _images[key];
}
}
private Uri GetIconUri(Declaration... | {
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"tags": "c#, winforms, wpf, rubberduck",
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} |
ros, ros-kinetic, ubuntu, ubuntu-xenial
NODES
/camera/
realsense2_camera (nodelet/nodelet)
realsense2_camera_manager (nodelet/nodelet)
rviz (rviz/rviz)
ROS_MASTER_URI=http://localhost:11311 | {
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"url": null
} |
parsing, r
Title: A faux parser for fdf files Introduction
If you know what FDF files are, you can skip this section.
PDF files sometimes includes form fields. These fields can be represented as FDF in plain text form, extracted using certain utilities. Important things to note about this file are:
A field is represen... | {
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"tags": "parsing, r",
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} |
thermodynamics, ideal-gas
But from school, I remember learning that temperature of an isolated system will remain constant forever if heat is not transferred.
So why would the gas cool down? and why or why not? If you isolate the balloon from everything else then after filling it with gas the balloon will soon attain ... | {
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"tags": "thermodynamics, ideal-gas",
"url": null
} |
ruby, time-limit-exceeded
Let's see now the integers that have a difference of 3 between them.
There are seven pairs below 100:
[[2, 5], [35, 38], [55, 58], [62, 65], [74, 77], [82, 85], [91, 94]]
Let's name, diff, the difference between two integers, next and prev,
(diff = next - prev) and nMax, an upper bound o... | {
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"tags": "ruby, time-limit-exceeded",
"url": null
} |
options available to a company, particularly with regard to its manufacturing function is defined will. Equal lengths how do we multiply two matrices and … Here the first column of B call up each variable. Shown below − 8 1 4 9 5 6 the result is rectangular! The browser is OFF ] and [ latex ] 3\times 3 [ /latex ] prese... | {
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"openwebmath_score": 0.8378878235816956,
"tags": null,
... |
ros, mavericks, macosx, osx
~~ - catkin
~~ - genmsg
~~ - gencpp
~~ - genlisp
~~ - genpy
~~ - angles
~~ - bfl (plain cmake)
~~ - bond_core
~~ - cmake_modules
~~ - common_msgs
~~ - common_tutorials
~~ - console_bridge (plain cmake)
~~ - class_loader
~~ - cpp_common
~~ - desktop
~~ - desktop_full
~~ - di... | {
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"tags": "ros, mavericks, macosx, osx",
"url": null
} |
visible-light, photons, speed-of-light, bose-einstein-condensate
More generally, there is no need to slow light to fit more light into a given space. Photons are bosons so there is no limit to the number you can put in the same quantum state. As Brandon says in his comment, ultimately the limit would be that enough en... | {
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"openwebmath_score": null,
"tags": "visible-light, photons, speed-of-light, bose-einstein-condensate",
"url": null
} |
quantum-field-theory, quantum-electrodynamics, renormalization, feynman-diagrams, self-energy
Title: Coupling renormalization $\lambda\phi^4$ vs QED I have some doubts regarding the allegedly different procedures used in $\lambda\phi^4$ and QED.
First of all, I am more familiar with bare perturbation theory (no counte... | {
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"tags": "quantum-field-theory, quantum-electrodynamics, renormalization, feynman-diagrams, ... |
general-relativity, momentum, tensor-calculus, vectors, definition
From the Lagrangian standpoint, if we add a potential energy term then the Lagrangian equations of motion take the form
$$\frac{d}{d\tau} p_\mu = -\frac{\partial U}{\partial x^\mu} \equiv f_\mu$$
so as you say, from this perspective force is naturally ... | {
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"tags": "general-relativity, momentum, tensor-calculus, vectors, definition",
"url": null... |
organic-chemistry, stability, nitriles
All of this evidence indicates towards the reaction being ‘properly prototypical for a sigmatropic 1,2-rearrangement via a nonpolarized, tight, hypervalent three-centered transition state.’[1] The authors go on to state that this is in perfect agreement with ab initio calculation... | {
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"tags": "organic-chemistry, stability, nitriles",
"url": null
} |
the fact that function composition is associative. Proof. We have g = g I B = g (f h) = (g f) h = I A h = h. Deï¬nition. Dave4Math » Mathematics » Composition of Functions and Inverse Functions In this article, I discuss the composition of functions and inverse functions. For example, consider the squaring function sh... | {
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"lm_q2_score": 0.8354835391516132,
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"openwebmath_score": 0.9263285398483276,
"tags":... |
java, iterator, java-8, javafx, circular-list
I use it for example like this in practice (lots of irrelevant example code stripped down):
public class TemplateInvoiceController implements Initializable {
...
private List<SelectionData> selectionDataList = new LinkedList<>();
private CircularListCursor<Sele... | {
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"tags": "java, iterator, java-8, javafx, circular-list",
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} |
digital-communications, modulation, pll
Title: A question regarding using analog PLL circuit with QAM modulation for phase sync I was wondering if you can implement analog PLL circuits for phase synchronization in communication systems that transmit MQAM modulation signals?
I heard that you can't use analog PLL becaus... | {
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"tags": "digital-communications, modulation, pll",
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} |
c++, beginner, object-oriented, game
}
TeamBoard:
cout << string( 100, '\n' );
cout << "Team Board - All Teams and their Stats - Teams are not sorted" << endl << endl;
cout << OhioState.name << " | Overall - " << OhioState.overall << " ( " << OhioState.win << " - " << OhioState.loss << " ) " << endl <... | {
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"tags": "c++, beginner, object-oriented, game",
"url": null
} |
logic, first-order-logic
Note the premise A : T. This is the axiom for forall elimination, and it requires a value of the type that's quantified over. You can only find such a value in an empty environment if the type is non-empty. In other words, this axiom will only let you prove that there exists a set if the domai... | {
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"tags": "logic, first-order-logic",
"url": null
} |
c#, beginner, finance
[TestClass]
public class UnitTestGreenBook
{
private const double Delta = 0.001;
private Discount GreenBookDiscount;
[TestInitialize]
public void SetupTest()
{
GreenBookDiscount = Discount.GreenBook(2010);
}
[TestMeth... | {
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python, strings, time-limit-exceeded
def anagrams(word_list):
anagrams = {}
for w in word_list:
anagrams.setdefault(''.join(sorted(w)), []).append(w)
# print(anagrams)
return sorted( # sort is to make results always the same
[w for anagrams in anagrams.values()
... | {
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"tags": "python, strings, time-limit-exceeded",
"url": null
} |
$ar + 4dr = ar^2$
$a + 4d + 4dr = ar^2$
$a + 4d + 4dr = a + 14d$
$4d + 4dr = 14d$
$4dr = 10d$
$r = \frac{10d}{4d} = \frac{5}{2}$
$a + 4d = \frac{5}{2}a$
$4d = \frac{3}{2}a$
$8d = 3a$
4. Originally Posted by icemanfan
$a + 4d = ar$
$a + 14d = ar^2$
$ar + 4dr = ar^2$
$\color{red}{a + 4d + 4dr = ar^2}$
$a + 4d + 4dr = ... | {
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"lm_q2_score": 0.8244619328462579,
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"openwebmath_score": 0.9029608368873596,
"tag... |
linear-systems, z-transform
I slightly modified your Matlab/Octave script and added the analytical result $(8)$ for comparison. The analytical result is identical (up to numerical accuracy) to the result obtained by filtering: | {
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java, object-oriented, swing, gui
Title: Extremely Simple Paint Program in Java I have written a very basic paint program in java using AWT and Swing. I have separated the program into two different class files; one of them holds the JFrame and adds a custom panel (this custom panel being the second class file, extend... | {
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"tags": "java, object-oriented, swing, gui",
"url": null
} |
coefficient is a numerical measure of the of! You will obtain measure of a relationship which does not have to be and/or. Closer r … a correlation coefficient can be calculated for the data in the scatterplot is... More subtle measure is intraclass correlation coefficient then point biserial correlation coefficient ‘ r... | {
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"lm_q1_score": 0.9790357567351325,
"lm_q1q2_score": 0.8179682569878084,
"lm_q2_score": 0.8354835371034368,
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"openwebmath_score": 0.6706416606903076,
"tags"... |
java, design-patterns, mvc, swing
private void showPhomeNumberNotEnterdError()
{
if(ClientValidatorUtils.isPhoneNumberEntered(clientRegistration))
{
displayDefaultPhoneNumber();
}
else
{
displayPhoneNumberNotEnteredError();
}
}
privat... | {
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"tags": "java, design-patterns, mvc, swing",
"url": null
} |
php, mvc, url-routing
So the .htaccess passes the request to index.php with ?url=<request>, and an optional is_error=1 set if a user has manually appended ?url= or &url= into the url as a GET parameter.
The Router
The code I'm showing here is not for the actual dispatching of the request to the correct controller / me... | {
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"tags": "php, mvc, url-routing",
"url": null
} |
c++, beginner, fizzbuzz
fizzbuzz_view<long>{1}
long
fizzbuzz_view{1, 10L}
<compile-time error>
fizzbuzz_view<long>{1, 10L}
long
I would also suggest exploring some gotchas and corner cases:
What happens if the starting value is valid? (Your code currently skips past it.)
What happens if the starting value is not v... | {
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• @MichaelHardy Is there anything you'd like me to add or change to make this an acceptable answer? – jnez71 Jun 14 '18 at 21:30
• I would count "geometric" as "physical" if it were about some question of geometry that arises without thinking about the Laplace transform. – Michael Hardy Jun 15 '18 at 2:39
• If I had a ... | {
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"openwebmath_score": 0.9987971186637878,
"ta... |
programming-languages, program-correctness, software-verification
Title: Formal program verification in practice As a software engineer, I write a lot of code for industrial products. Relatively complicated stuff with classes, threads, some design efforts, but also some compromises for performance. I do a lot of testi... | {
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"tags": "programming-languages, program-correctness, software-verification",
"url": null
} |
general-relativity, cosmology, spacetime, topology, cosmological-inflation
It is possible to have a perfectly flat torus. But then in empty space you have a preferred frame of rest, the one that has a surface of simultaneity that appears just once on the chess set. Now haven't a globally distinguished frame isn't a p... | {
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"tags": "general-relativity, cosmology, spacetime, topology, cosmological-inflation",
"ur... |
javascript, jquery
But, most importantly, by using $({selector}).click(), you are binding the click event to {selector}. Should you remove {selector} and re-add a new {selector} in its place, the click event will be lost. This is not the case with applying the .on() to a parent element. | {
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chirality, helicity
Ok now get your alien to set up an experiment with cobalt-60 nuclei. They will need to be able to determine the angular momentum of the nuclei, and to detect electrons. Find out which way most of the emitted electrons go in beta decay. Also put a little turntable near your experiment, and have the ... | {
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"tags": "chirality, helicity",
"url": null
} |
quantum-field-theory, hilbert-space, wavefunction, probability, born-rule
Single-photon camera recording of photons from a double slit illuminated by very weak laser light. Left to right: single frame, superposition of 200, 1’000, and 500’000 frames. | {
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"url... |
human-biology, experimental-design, memory, olfaction
Title: How to design an experiment with scent triggered memory recall in humans? I've recently learned that scents can trigger memory recall in humans, and am thinking about setting up an experiment where I would attempt to induce memory recall through exposure to ... | {
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"id": 2170,
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"tags": "human-biology, experimental-design, memory, olfaction",
"url": null
} |
human-biology, genetics, molecular-biology, molecular-genetics
[image from SEC]
Such a double-stranded stretch of mRNA is abnormal, of course, but the effect of its presence at least some of the time is to cause the mRNA to undergo repair in the duplex area in a manner which makes a break in the main strand opposite t... | {
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"tags": "human-biology, genetics, molecular-biology, molecular-genetics",
"url": null
} |
stresses, strength, material-science
This sort of plot can be generated by tension-testing to failure a small coupon of metal. The initial linear portion of the plot is where the material is still elastic. The slope of this line is the elastic modulus (aka Young's Modulus or Modulus of Elasticity). In this region, th... | {
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"openwebmath_score": null,
"tags": "stresses, strength, material-science",
"url": null
} |
electromagnetic-radiation, waves, acoustics
Title: Can light waves cause beats? My question is pretty brief. When two sound waves of nearly same frequencies interfere, we get beats.
But, I have not observed something like that happening in the case of light. In fact, most of the light around us is a collection of cont... | {
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"tags": "electromagnetic-radiation, waves, acoustics",
"url": null
} |
units, dimensional-analysis, escape-velocity
Title: Why are the dimensions of escape velocity correct? How does this formula work, from a dimensional analysis perspective?
$$ v_\text{escape} = \sqrt{\frac{2GM}{R}}$$
The way I'm thinking about it is that $G$ is in units $\text{N} \cdot \text{m}^2/\text{kg}^2$. You mul... | {
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"tags": "units, dimensional-analysis, escape-velocity",
"url": null
} |
interval [x 1, x 2 ], since f(x 1) and f(x 2) have different signs. Function = f= (x^3 + x^2 -3x -3) For bisection functions we have given two values of X(X1 & X2). Matlab Build-in Function. any help would be appreciated. The variable f is the function formula with the variable being x. (b) Use the bisection method to ... | {
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"id": null,
"lm_label": "1. YES\n2. YES\n\n",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9845754474655618,
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"lm_q2_score": 0.8723473763375643,
"openwebmath_perplexity": 521.1656787315939,
"openwebmath_score": 0.6526755094528198,
"tags": nu... |
filter-design, digital-filters
I'm starting from the ground up in digital filter design and I thought that I need to decide on a program that lets me experiment with different filter designs (not pre-built functions, but rather self-written). Make plots and perhaps .wav outputs and such.
I'm looking for something high... | {
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"openwebmath_score": null,
"tags": "filter-design, digital-filters",
"url": null
} |
python
def getRankedStats(config, player, season, ship=None):
'''
Gets the players ranked stats for specified player, (optional) ship and season from the Wargaming API
Returns stats() on success.
Returns ErrorType enum on failure
'''
try:
if ship is not None:
url = api.rssta... | {
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"tags": "python",
"url": null
} |
snr, quantization, cosine, thd
which gives $a \approx 0.156936321399$. This can be used to create an approximation of the optimal $A$ as function of $m$, intended for large $m \ge 20$:
$A \approx 2^{m-1} - 1 + 0.156936321399 + e^{-1.2749819017
- 0.3464088917 m},\tag{8}$
where the coefficients in the exponent were cal... | {
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"tags": "snr, quantization, cosine, thd",
"url": null
} |
ros, roslaunch, yaml, parameter
Title: How to override a parameter in an anonymous node?
I created an Operator Control Unit (OCU) that works with heterogeneous robots. During exercises, several operators (each at one computer) launch the OCU with different parameters depending on the robots that they control. Therefo... | {
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"tags": "ros, roslaunch, yaml, parameter",
"url": null
} |
neuroscience, brain, experimental-design, synapses
Title: Why use embryonic neurons to study protein knockouts/mutants in long term potentiation? Just wondering if anyone had some ideas about the question in the title. I'm just wondering why some papers use embryonic cultures of specific brain regions for neurones to ... | {
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"tags": "neuroscience, brain, experimental-design, synapses",
"url": null
} |
is denoted by a superscript 3, for example 2 3 = 8 or (x + 1) 3.. *(a) 1000(b) 400(c) 100(d) 600 techfunwithsoumik32 techfunwithsoumik32 16.10.2020 Math Primary School Which of the following numbers is a cube number ? The first value in hex is 3e8, which is 1000 (10 3 ) in base-10, the next value is 533, which is 1331 ... | {
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"lm_q1_score": 0.9664104914476339,
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"lm_q2_score": 0.8397339616560072,
"openwebmath_perplexity": 497.84497231187635,
"openwebmath_score": 0.5134052634239197,
"tags": nu... |
atmosphere, atmosphere-modelling, atmospheric-chemistry
The sort answer to your question would therefore be: "the longer the better", but this would also depend on the complexity of your model and the computing time that you need to dedicate to the spin-up period (i.e., if your model takes a week to simulate a month, ... | {
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"openwebmath_score": null,
"tags": "atmosphere, atmosphere-modelling, atmospheric-chemistry",
"url": null
} |
electromagnetism
Title: Are magnetic forces medium-dependent? I am learning the Magnetic Effects of Electric Currents at school, and I was given an equation. I was told it would be elaborated on next year. But since I can't seem to bring myself to wait, here it is:
B = µoI/2πr | {
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"id": 9911,
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"tags": "electromagnetism",
"url": null
} |
c++, c++14, pointers, qt, raii
That looks quite ok to me in simple cases. But when I designed my first own Widget class I had a lot of boiler-plate code around all this unique_ptr/non-owning-alias.
Here is my header file:
// 005-my-window/my_window.hpp
#ifndef MY_WINDOW_HPP
#define MY_WINDOW_HPP
#include <QWidget>
#in... | {
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"tags": "c++, c++14, pointers, qt, raii",
"url": null
} |
control, python
Title: ROS python control for drcsim2.5
I've been following the python tutorial to the letter:
http://gazebosim.org/wiki/Tutorials/drcsim/2.5/Atlas_control_over_ROS_topics_with_python
But when I try to test it, it goes
Traceback (most recent call last):
File "traj_yaml.py", line 4, in <module>
f... | {
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"tags": "control, python",
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performance, beginner, sql, sqlite
COALESCE(
(SELECT "NOM_VALIDE" FROM TAXREF_AMPHIBIENS WHERE "NOM_VALIDE_SIMPLE" = ESPECES_ATTRIBUTS.NOM_SIMPLE),
CASE
WHEN (SELECT COUNT(*) FROM TAXREF_AMPHIBIENS WHERE "LB_NOM" = ESPECES_ATTRIBUTS.NOM_SIMPLE) = 1 THEN (SE... | {
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"tags": "performance, beginner, sql, sqlite",
"url": null
} |
In computer science, and more specifically in computer algebra, when representing mathematical objects in a computer, there are usually many different ways to represent the same object. In this context, a canonical form is a representation such that every object has a unique representation. Thus, the equality of two ob... | {
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"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9822877007780707,
"lm_q1q2_score": 0.818564494631763,
"lm_q2_score": 0.8333245891029456,
"openwebmath_perplexity": 355.514958037154,
"openwebmath_score": 0.8907015919685364,
"tags": nu... |
java, connect-four
There are a few more spots that need similar treatment, but this could be automatically done by an IDE.
The other thing is that you have some unnecessary code duplication here:
public Board() {
board = new int[7][6];
WIDTH = board.length;
HEIGHT = board[0].length;
}
public Board(int w,... | {
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"tags": "java, connect-four",
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} |
c#, asynchronous
Title: Running async tasks and cancelling after a timeout if necessary - follow up (1) The previous question was a really bad design where I had all the logic in the Main method. The only way to test it was to look at the output in the console. I now encapsulated it in an extension method and wrote tw... | {
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"tags": "c#, asynchronous",
"url": null
} |
c++, c++20, variant-type
Simplify returning values from parse()
I think your parse() is unnecessarily complex because you forgot to add constexpr to the second and third if-statement. I think you can completely avoid the temporary variable res:
template <typename T>
auto parse(std::string_view str)
{
using T2 = st... | {
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"tags": "c++, c++20, variant-type",
"url": null
} |
c++, template-meta-programming, c++20
// capacity
constexpr size_type size() const noexcept { return N; }
constexpr size_type max_size() const noexcept { return N; } | {
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python, clustering, k-means, pca, text-classification
There are other algorithms that might suit your needs better, like DBSCAN or Agglomerative clustering. They don't require the user to choose number of parameters, but do require you to pass in metrics to determine cluster separation. I've used DBSCAN effectively, b... | {
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"tags": "python, clustering, k-means, pca, text-classification",
"url": null
} |
newtonian-mechanics, reference-frames, coriolis-effect
I am fine with it except for the final line(in bold). Where is the spring balance here? I can't imagine where I could fit it in the picture for it to give a transverse force to the particle. Is it attached to the center or the circumference of the circle or where ... | {
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"tags": "newtonian-mechanics, reference-frames, coriolis-effect",
"url": null
} |
cc.complexity-theory, machine-learning, linear-programming, lg.learning
This reduction just adds a row and a column to $A$, and a new variable $t$.
Assume then that you are given the problem $Ax < 0$.
Create a data set which has one point labeled red for every row of $A$, and is equal to that row. It also contains t... | {
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"tags": "cc.complexity-theory, machine-learning, linear-programming, lg.learning",
"url":... |
javascript
function flattenDictionary(dict) {
const result = {}, pathStack = [];
const push = (obj, path) => pathStack.push({obj, path});
push(dict, "");
while (pathStack.length > 0) {
const node = pathStack.pop();
const path = node.path + (node.path !== "" ? "." : "");
for (con... | {
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"id": 30863,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "javascript",
"url": null
} |
rna
The structure of these triple helices involves a combination of Watson-Crick base pairing in the DNA duplex together with Hoogsteen base pairing in the RNA-DNA interaction:
Figure taken from:
Morgan, A. R. & Wells, R. D. (1968) Specificity of the three-stranded complex formation between double-stranded DNA and s... | {
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"tags": "rna",
"url": null
} |
electrons, atomic-physics, atoms
In the macroscopic world we take it for granted that an object, e.g. a tennis ball, has a well defined position. However when we get down to the size range where quantum effects become important we find that quantum objects like electrons are described by wavefunctions that are spread ... | {
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"tags": "electrons, atomic-physics, atoms",
"url": null
} |
matrix requires some knoledge of math… R. A rotation matrix describes the relative orientation of two such frames. This paper provides a basic introduction to the use of quaternions in 3D rotation applications. square matrix – For 2D, 3x3 matrix – For 3D, 4x4 matrix. This format is definitely less intuitive than Euler ... | {
"domain": "valledelchieseonline.it",
"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.986777179414275,
"lm_q1q2_score": 0.8537833831960149,
"lm_q2_score": 0.8652240860523328,
"openwebmath_perplexity": 608.277822995443,
"openwebmath_score": 0.5945829749107361,
... |
quantum-mechanics, wavefunction, quantum-states
$^1$ I'm assuming the states to be normalized ($\langle \psi|\psi\rangle = 1$) when writing the expression for the probability. | {
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"id": 89308,
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"tags": "quantum-mechanics, wavefunction, quantum-states",
"url": null
} |
f#, web-scraping, factory-method
Title: Factory pattern in F# for a web scraper I'm trying to learn F# by creating a little web scraper that will do custom scraping based on the url domain. For this, I need to create and select the correct kind of scraper. I figure I would use a Factory that would determine the correc... | {
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"openwebmath_score": null,
"tags": "f#, web-scraping, factory-method",
"url": null
} |
quantum-mechanics, heisenberg-uncertainty-principle, wave-particle-duality
Title: Quantum mechanics and Couder experiments Couder experiments ( https://www.youtube.com/watch?feature=player_embedded&v=W9yWv5dqSKk and https://hekla.ipgp.fr/IMG/pdf/Couder-Fort_PRL_2006.pdf), published in 2006, state that by dropping sili... | {
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"tags": "quantum-mechanics, heisenberg-uncertainty-principle, wave-particle-duality",
"url... |
javascript, unit-testing, ecmascript-6, event-handling, dom
QUnit.test('update model updates UI', assert => {
const obj = gen();
const ui = uiTester(obj);
obj.upvote();
assert.equal(ui.count(), 1);
assert.equal(ui.upvoted(), true);
obj.downvote();
assert.equal(ui.count(), -1);
assert.equal(ui.upvoted... | {
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"tags": "javascript, unit-testing, ecmascript-6, event-handling, dom",
"url": null
} |
machine-learning, deep-learning, backpropagation, gradient-descent
Fromulas:
Normal path:
$$\frac{\partial E}{\partial w_{1,1}} = \frac{\partial E}{\partial Out} \cdot \frac{\partial Out}{\partial a_{1,1}}\cdot \frac{\partial a_{1,1}}{\partial a_{0,1}}\cdot \frac{\partial a_{0,1}}{\partial w_{1,1}}$$
Alternate path:... | {
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"openwebmath_score": null,
"tags": "machine-learning, deep-learning, backpropagation, gradient-descent",
"url": null
} |
r
# assign values to that presized data frame
Acols <- ncol(A.data)
Bcols <- ncol(B.data)
for (i in 1:Arows) {
# get A data
Ai <- as.numeric(A.data[i, 2:Acols])
Aname <- A.data[i, 1]
for (j in 1:Brows) {
# calculate row offset in presized data frame
ij <- (i - 1) * Brows + j
# get B data
Bj <-... | {
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"id": 605,
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"lm_q2_score": null,
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"openwebmath_score": null,
"tags": "r",
"url": null
} |
c++, opengl
file.close();
return output;
}
void Shader::CheckShaderError(GLuint shader, GLuint flag, bool isProgram, const char* msg){
GLint success = 0;
GLchar error[1024] = { 0 };
if (isProgram)
glGetProgramiv(shader, flag, &success);
else
glGetShaderiv(shader, flag, &success);
... | {
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"id": 13943,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "c++, opengl",
"url": null
} |
java, algorithm, pathfinding
Much as I love Lisp, and this is totally subjective, but I find this indentation and parenthesis placement kinda weird (at least the initial lining up under the parenthesis) and would lean towards something like
open.add(
new HeapNode(
childNode,
tentativeDistance + heu... | {
"domain": "codereview.stackexchange",
"id": 27397,
"lm_label": null,
"lm_name": null,
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"lm_q2_score": null,
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"openwebmath_score": null,
"tags": "java, algorithm, pathfinding",
"url": null
} |
javascript, html, calculator
I am worried this is old and outdated. Could I do this more effectively with C# in the app? Here are a few thoughts. Some are probably overkill, but I'm just brainstorming.
Overall, it seems fairly solid if a little outdated. JohnP mentioned the bit about hard-coded prices, and I agree, bu... | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "javascript, html, calculator",
"url": null
} |
energy, nuclear-physics, radiation, explosions
Title: Nuclear bomb power - myth? I'm not experienced in physics yet (if it helps I've covered as much as acceleration, momentum and energy transfer/chemistry ionic and covalent bonding) but I've heard that the way people compare destructive force of nuclear weapons by me... | {
"domain": "physics.stackexchange",
"id": 31427,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "energy, nuclear-physics, radiation, explosions",
"url": null
} |
nextflow
output:
tuple val(case_id), path("${case_id}.mutect2.vcf")
script:
def avail_mem = task.memory ? task.memory.toGiga() : 0
def java_options = [
avail_mem ? "-Xmx${avail_mem}G" : "",
"-XX:+UseSerialGC",
]
"""
gatk \\
--java-options "${java_options.join(' ')}... | {
"domain": "bioinformatics.stackexchange",
"id": 2528,
"lm_label": null,
"lm_name": null,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "nextflow",
"url": null
} |
formal-languages, turing-machines
Make a single pass through, making sure that you encounter $0$s followed by $1$s followed by $2$s followed by $3$s. You should think through the end conditions if this process goes smoothly, or what items you might encounter on the tape that could send you to a reject state.
Now chec... | {
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"id": 9028,
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"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "formal-languages, turing-machines",
"url": null
} |
astrophysics, estimation, sun, stars, stellar-evolution
Title: What will be the mass of the sun when the core is depleted of hydrogen about 5 billion years from now? Our sun converts 600 million tons of H to He every second, that is 5 million tons of matter into energy through nuclear fission. However, as the core of ... | {
"domain": "physics.stackexchange",
"id": 66411,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "astrophysics, estimation, sun, stars, stellar-evolution",
"url": null
} |
solid-state-physics, quantum-electrodynamics
For dilute gasses, Feynman adresses the question of calculating the dielectric constant from a first principles calculation in his 1963 Acta Physica Polonica article which introduced ghost fields. The frequency dependent dielectric constant is determined from the scattering... | {
"domain": "physics.stackexchange",
"id": 1556,
"lm_label": null,
"lm_name": null,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "solid-state-physics, quantum-electrodynamics",
"url": null
} |
Group core
The first one is the simplest of all of them: the OSG::Group core. A group core does nothing in special it just makes it possible to have a node and attach several children to it. You see, this is the solution to our empty node problem from above. Like every other class derived from FieldContainer, cores to... | {
"domain": "opensg.org",
"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.960951703918909,
"lm_q1q2_score": 0.8007846957492477,
"lm_q2_score": 0.8333246015211008,
"openwebmath_perplexity": 1165.5234625527432,
"openwebmath_score": 0.3680899441242218,
"tags": nul... |
mathematics, hamiltonian-simulation, terminology-and-notation
In the article:
$\hat{G}$ and $\hat{U}$ are called "oracles".
$\hat{H}$ is an Hermitian operator in $\mathbb{C}^{2^n} \times \mathbb{C}^{2^n}$.
$\vert G \rangle \in \mathbb{C}^d$ (legend of Table 1).
My question is the following: what means $\hat{H} = \la... | {
"domain": "quantumcomputing.stackexchange",
"id": 501,
"lm_label": null,
"lm_name": null,
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"lm_q2_score": null,
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"tags": "mathematics, hamiltonian-simulation, terminology-and-notation",
"url": nu... |
javascript, regex
For example, the source could be the following as the parameter to the function (as a string)
{
"level1": [{
"type": "image",
"key": "starwars",
"url": "assets/pics/unknown-the_starwars_pic.png",
"overwrite": false
},{
"type": "... | {
"domain": "codereview.stackexchange",
"id": 18995,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "javascript, regex",
"url": null
} |
php, object-oriented, mysql, pdo
I'd hate to use that code. Also, this just doesn't add up:
try
{
$this->datab = new PDO("mysql:host={$host};dbname={$dbname};charset=utf8", $username, $password, $options);
$this->datab->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
$this->datab->setAttribute(... | {
"domain": "codereview.stackexchange",
"id": 15033,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "php, object-oriented, mysql, pdo",
"url": null
} |
homework-and-exercises, newtonian-mechanics, forces, estimation, free-fall
Would I suffer irrecoverable injuries and die a horrible death? Or would the balloons stop my fall slowly?
Maybe. Devil in the details. But I'd be inclined to say quite probably the former and less likely the later.
If you were injured it wo... | {
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"openwebmath_score": null,
"tags": "homework-and-exercises, newtonian-mechanics, forces, estimation, free-fall",
"ur... |
python, python-3.x
I do have plans on just making a package and separating the classes into individual files. As well as putting the authorship information in an __init__.py.
Currently, the above code works, however, I feel it could be better. I am open to anything that can help me improve it.
Use Cases:
When writing ... | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "python, python-3.x",
"url": null
} |
visible-light
Title: Why does bright pure red/green/blue light look white if bright enough? I believe that white light is white because it contains every wavelength, as white by itself has no frequency by itself.
Can somebody explain why really bright pure red, green, or blue LEDs seem white to us and to cameras?
Also... | {
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"id": 50879,
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"lm_q2_score": null,
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"openwebmath_score": null,
"tags": "visible-light",
"url": null
} |
Note $$\ \gcd( 154,182)=\color{#c00}{14}\,$$ so factoring it out and cancelling it yields
$$\color{#c00}{14}\cdot 13\,\mid\, \color{#c00}{14}\,(11x\!-\!1)\!\!\overset{\rm\ \ cancel\ \color{#c00}{14}_{\phantom{I_I}}\!\!\!\!}\iff\ 13\mid 11x\!-\!1\iff {\rm mod}\ \ 13\!:\ x\equiv \dfrac{1}{11}\equiv \dfrac{-12}{-2}\equiv... | {
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"id": null,
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"lm_q1_score": 0.9773707953529717,
"lm_q1q2_score": 0.8383574950025889,
"lm_q2_score": 0.8577681049901037,
"openwebmath_perplexity": 281.7732671103391,
"openwebmath_score": 0.9300647974014282,
"tag... |
sql, databases, etl
Title: Why two different series of SQL queries which do the same thing just in a different order have a different number of rows in their outputs? I am working on a group project for the US Forest Service to create a dashboard on the US's arial firefighting operations and resources. This part is fo... | {
"domain": "datascience.stackexchange",
"id": 11573,
"lm_label": null,
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"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "sql, databases, etl",
"url": null
} |
beginner, c, file, image
Title: Read and write BMP file in C I'm teaching myself a little C, and I've found this website. It has an exercise about manipulating a BMP file in C. I would like to know if I can make my code look more "idiomatic" or professional, from the format of the comments to the name of the variables... | {
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"tags": "beginner, c, file, image",
"url": null
} |
These are essentially special cases of gcd/ideal-theoretic ways to prove that $\rm\: \mathbb Z\:$ is integrally-closed, i.e. it satisfies the monic Rational Root Test. Namely, a rational root of a monic polynomial $\rm\in\mathbb Z[x]\:$ must be integral. Perhaps the slickest way to prove such results is the elegant one... | {
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"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9669140235181257,
"lm_q1q2_score": 0.8036438644796027,
"lm_q2_score": 0.8311430436757313,
"openwebmath_perplexity": 442.3606955648712,
"openwebmath_score": 0.891287088394165,
"tags... |
java, matrix, generics, library, linear-algebra
/**
* {@inheritDoc }
*/
@Override
public DenseMatrix2D<E> immutableNegate() {
DenseMatrix2D<E> ret = new DenseMatrix2D<>(width,
height,
fieldEl... | {
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "java, matrix, generics, library, linear-algebra",
"url": null
} |
php, validation, mvc
Don't echo out raw error/exception messages to the caller. Log them. Then have the application do the appropriate thing in terms of generating error response (with appropriate HTTP error codes). I am guessing the logic should actually live in your controller, with there not being any try-catch h... | {
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"tags": "php, validation, mvc",
"url": null
} |
• That is a nice question and I have some ideas on how an answer could look like. But without a reproducible example, I am not investing my time. OP, deliver! – Henrik Apr 19 '13 at 19:29
• What makes you want type III ("U.S. Senate") tests as opposed to type II ("U.S. House of Representatives") tests? (analogies due t... | {
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"lm_q2_score": 0.8596637451167997,
"openwebmath_perplexity": 3750.514030641052,
"openwebmath_score": 0.633062481880188,
"tags... |
robotic-arm, ros, embedded
This file just tells cmake how to look for things it needs. Think about CMAKE_FIND_ROOT_PATH as the starting point for your system. Cmake won't search down any path that doesn't begin with CMAKE_FIND_ROOT_PATH. So if you have boost libraries installed on your system under /usr/lib and you al... | {
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"openwebmath_score": null,
"tags": "robotic-arm, ros, embedded",
"url": null
} |
c#, performance, programming-challenge, sorting
It's good that you've given some description of what the custom comparer does. However, I don't understand the description you provide.
I'd prefer to see x[0].CompareTo(y[0]) instead of x[0] = y[0]: it's much clearer what is going on, and it doesn't risk overflowing for ... | {
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"tags": "c#, performance, programming-challenge, sorting",
"url": null
} |
And we want to choose one card from any of the remaining 11 ranks.....
So we have
C(13,2)[C(4,2)}^2 * C(11,1)C(4,1) = 123,552
CPhill Mar 15, 2015
#3
+92624
+5
Ok I'll give you another possibility,
there are 52 ways of choosing the first card
there are 3 ways of chooing its pair
there are 48 ways of choosing th... | {
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"lm_q2_score": 0.847967764140929,
"openwebmath_perplexity": 2760.915328615229,
"openwebmath_score": 0.8127923011779785,
"tags": null,... |
For the first part of this post, see here.
Throughout this post, $X$ is a set, $G$ is a group with identity element $1,$ and $G$ acts on $X.$
We now show that the action of $G$ on $X$ partitions $X$ into subsets called orbits and if $G$ is finite, then the number of elements of each orbit is finite and it divides the... | {
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"lm_q1_score": 0.99253935499126,
"lm_q1q2_score": 0.8044322223327997,
"lm_q2_score": 0.8104789178257654,
"openwebmath_perplexity": 53.15373097102637,
"openwebmath_score": 0.984871506690979,
"tags": nul... |
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