text stringlengths 1 1.11k | source dict |
|---|---|
c++
std::cout << std::setw( 28 ) << std::left << std::setfill( ' ' )
<< "instruction counter" << std::noshowpos << std::setfill( '0' )
<< std::right << std::setw( 2 ) << ins_cnt << '\n';
std::cout << std::setw( 25 ) << std::left << std::setfill( ' ' )
<< "instruction register" << std::showpos << s... | {
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newtonian-mechanics, forces, mass, acceleration, differentiation
You question highlights the fact that when mass flows the application of Newton's second law must be done with care as illustrated in these examples. | {
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Here are some locus notes, examples, and a practice test that utilize geometry concepts. Purpose of the TestThe Mathematics Placement Test is a pass-fail test!The placement test gives a measure of a student's mathematical skills and knowledge of specific concepts at the time, and the results are used to determine eligi... | {
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"lm_q2_score": 0.8289388062084421,
"openwebmath_perplexity": 481.1933466521879,
"openwebmath_score": 0.6260458827018738... |
recursion
log2 :: Integer -> Integer
log2 = fst . recNat (\n (c, p) -> if 2*p > n+1 then (c, p) else (c+1, 2*p)) (0, 1) | {
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"url": null
} |
urg-node, ros-kinetic, master, hokuyo, time
Title: Serial Connection to Hokuyo from Master
Hi,
I am currently getting the error:
[ERROR] [1531729856.715593296]: Error connecting to Hokuyo: Could not open serial Hokuyo:
/dev/ttyACM0 @ 115200
could not open serial device.
Initially, after encountering this problem, I ... | {
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"tags": "urg-node, ros-kinetic, master, hokuyo, time",
"url": null
} |
electromagnetism, waves, electromagnetic-radiation, magnetic-fields, electric-fields
Title: Do these two electromagnetic waves interfere constructively or destructively? let's consider two electromagnetic waves with same frequency that meet at the same point P in the figure.
where:
$\vec{S_1}$ and $\vec{S_2}$ are th... | {
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quantum-mechanics, nuclear-physics, radioactivity, statistics, half-life
As Akhmeteli's answer says, true memorylessness is actually incompatible with simple quantum models. For example, one can derive the exponential lifetime for an excited fluorophore from a simple model of a lone excited two state fluorophore equal... | {
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"url"... |
by swapping all zeros and for... Matrix fields operations in R RT and it fails to be a finite … relations can be used represent... Sizes for Basic operations do it algebra with the operations and & between. Url address, possibly the category ) of the vector look at another to! Studied and nally the exponential map for ... | {
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"openwebmath_score": 0.8650836944580078,
"... |
signal-analysis, emg
Title: Remove mean EMG What is the mean of EMG signal? And what's the purpose of removing it?
https://docs.google.com/document/d/e/2PACX-1vRH3qfvMvmHBdHhg3sFQKTwo1-blg8luLXSQRhsIhEgwFj3QmWGStUhvslrVuVzP-aQ3T0YNs-lUsOz/pub
What is the mean of EMG signal?
Like with any other signal, the mean is s... | {
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"tags": "signal-analysis, emg",
"url": null
} |
java, strings, array, game, homework
Title: High School Java Class: Pong Project External Reviewer It would be a huge help if you could tell me ways to make my code run smoother and if I could add more code to my program to make my program more unique.
Panelball class:
import java.awt.*;
import java.awt.event.KeyEve... | {
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If $n$ is even then $[\tfrac{n-1}{2}] = \tfrac{n}{2} - 1$.
And the sum becomes $F_2 + F_4 + ... + F_{n-2} + F_n = F_{n+1} - 1$.
It is now easier to analyze this problem.
Hmmm. I tried it this way, as you suggested, and broke the problem down into the cases when $n$ is even or odd. But in each of those cases, in the in... | {
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"openwebmath_score": 0.9807931780815125,
"ta... |
filters, autocorrelation
Title: Mean of input based on acf of filtered output By looking at the ACF of the output of a filter whose impulse response I know, can I approximate the mean of the input?
For example
x = randn(1000,1);
y1=filter(ones(5,1),[1],x);
y2=filter(ones(5,1),[1],x + 0.2);
res1 = xcorr(y1,'unbiased')... | {
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"tags": "filters, autocorrelation",
"url": null
} |
cosmology, universe, space-expansion
I had known these two for some time hence I woke up with the dilemma today. So my question is, how come it can be argued that universe is finite just because it is dark if we know that we can only observe a finite portion of it? Can't it be the case that the universe is infinite ev... | {
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} |
statistical-mechanics, diffusion
$$P(t) = {A\over R} (1 - {R-A\over \sqrt{t}})$$
Which is to be compared to the exact answer below.
Time dependent problem
The time dependent problem, the original question, also has a closed form solution. The first thing to note is that the distance between the two particles is underg... | {
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"tags": "statistical-mechanics, diffusion",
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lagrangian-formalism, supersymmetry, research-level, quantization, sigma-models
--
Comment added: I should add that Vafa in the book at page 184 makes some comments about operator ordering, even though in a simpler case. The difference here is that, to my understanding, we have to provide an ordering (also in the susy... | {
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"tags": "lagrangian-formalism, supersymmetry, research-level, quantization, sigma-models",
... |
ros, cad, model, pointcloud
Title: CAD, Point Cloud Matching
Hi,
I have ROS fuerte on my ubuntu 11.10 O.S. .. I have created a point cloud for an object using RoboEarth detector and I want my robot " with a kinect on it " to be able to try matching this point cloud with a CAD Model of the same object or similar, whic... | {
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"tags": "ros, cad, model, pointcloud",
"url": null
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$\begin{array}{c|cc}\hline n\backslash p& 2 & 3 & 5 & 7 & 11 & 13 & 17 & 19 & 23 & 29 & 31 & 37 & 41 & 43 & 47 & 53 & 59 & 61 & 67\\ \hline 1& 1 & 2 & 3 & 3 & 4 & 3 & 5 & 4 & 5 & 4 & 4 & 4 & 4 & 4 & 6 & 4 & 5 & 4 & 5\\ 2& 2 & 3 & 4 & 4 & 5 & 4 & 6 & 5 & 6 & \vdots&\vdots&\vdots&\vdots&\vdots&\vdots&\vdots&\vdots&\vdots... | {
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"openwebmath_score": 0.9223108291625977,
"tag... |
# Determine if a system described by a differential equation is linear
A system ("A System is any physical set of components that takes a signal, and produces a signal") is described by this equation:
$\frac{dy(t)}{dt} + 3 \times y(t) = x(t)$
Where $x(t)$ is the input and $y(t)$ the output.
How to determine if this... | {
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"openwebmath_score": 0.899189293384552,
"tag... |
c, circular-list
This loop is correct but a little confusing to me because you have two loop variables. I think you could remove the i variable and just use j like this:
/* Move the preceding elements one position to the right. */
for (j = elements_before; j > 0; --j)
{
p_list->p_table[(head + j) ... | {
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javascript, datetime, comparative-review, formatting
As constants
But.. These are magic numbers, and you repeat some of them several times, which is prone to error. Also assuming that this function would be part of a set of such functions declaring these constants as named variables would be much better.
DAY_MS = 8.64... | {
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classical-mechanics, mathematical-physics, lagrangian-formalism, differential-geometry, resource-recommendations
Title: Classical mechanics without coordinates book I am a graduate student in mathematics who would like to learn some classical mechanics. However, there is one caveat: I am not interested in the standard... | {
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wavelet, approximation, dwt
But after seeing the post, I have a question in my mind.
Is it possible to say that setting DWT coefficient values to zero which is lower than threshold is the dimensional reduction?
I mean, suppose we have 5 dimensional vector
<1,4,3,5,2> which can be thought as result of DWT.
And after se... | {
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"tags": "wavelet, approximation, dwt",
"url": null
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transform
class amcl_pose_listener {
public:
ros::NodeHandle n_;
//Message filters for subscribed sensor msgs
message_filters::Subscriber<geometry_msgs::PoseWithCovarianceStamped> pose_sub_; //Subscriber to a published pose msg (from a localiser such as AMCL, etc)
ros::Publisher traj_pub_, lin... | {
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javascript, node.js, authentication, express.js
// In this case, we used a custom error. We can get the data from it.
// You can have more of these for the other custom classes.
if(error instanceof PasswordConfirmError){
response.render('pages/changePassword', {
user: error.user,
text: er... | {
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"tags": "javascript, node.js, authentication, express.js",
"url": null
} |
ros, urdf, collada, dae, stl
Originally posted by Adolfo Rodriguez T with karma: 3907 on 2012-07-27
This answer was ACCEPTED on the original site
Post score: 26 | {
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"tags": "ros, urdf, collada, dae, stl",
"url": null
} |
php, optimization, object-oriented, design-patterns, pdo
Title: Redunancy Issues in PHP Class I've been studying PHP for a while now and decided to dive into OOP. Most of my code was a mess and I've begun to refactor much of the website to OOP; however, I'm having an issue with redundancy in my class functions. Belo... | {
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"tags": "php, optimization, object-oriented, design-patterns, pdo",
"url": null
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15 Jul 2016, 00:10
zz0vlb wrote:
What is the average (arithmetic mean) of eleven consecutive integers?
(1) The average of the first nine integers is 7
(2) The average of the last nine integers is 9
For odd number of consecutive integer the mean and median both is the middle value. Use this property to solve th questi... | {
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"url"... |
• realize this is an algorithm suggestion and not a code review: to find such a number that is the smallest number divisible by all numbers up to N: you could probably generate all the primes up to N and consider their largest power <= N, and then take that product. May 26 at 18:51
• An implementation of this would loo... | {
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"openwebmath_score": 0.41788914799690247,
"ta... |
ros, python, ros-kinetic, multiple, subscribe
def turtleController():
global pub,vel_msg,goal_pose,pose
rospy.init_node('turtle_controller',anonymous=True)
pub = rospy.Publisher('/turtle1/cmd_vel',Twist,queue_size=10)
rospy.Subscriber('/turtle1/pose',Pose,update_pose)
rospy.Subscriber('/goal',Pos... | {
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"tags": "ros, python, ros-kinetic, multiple, subscribe",
"url": null
} |
r, bioconductor, sequence-annotation, errors
Title: GFF file too big to load into R I want to load a GFF (annotation) file into an R data frame in order to extract some information from it, e.g. the location of transposons in the genome.
I used the following code:
library(rtracklayer)
gff <- rtracklayer::import('c_ele... | {
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"url": null
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In other words, one has $$X_n = (\prod_{k=4}^n M_k)X_4$$. Your goal is now to express $$P_n :=(\prod_{k=4}^n M_k)$$ with a closed formula.
conjecture1 (wrong) for $$n\geqslant 5$$, one has $$P_n = \begin{pmatrix} (n-1)! & n(n-1)-12\\ 0 & (n-2)! \end{pmatrix}$$
New try (one should be able to solve the problem without ... | {
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"openwebmath_score": 0.8746145963668823,
"tag... |
ros-hydro
The problem is that there is no source list for saucy on the page mentioned. I know that there are no debian packages for saucy, but where are the source lists so I can install things like python-rosdep etc. Do I need to compile those from source too?
I know that people have managed to get this working, ju... | {
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electromagnetism, magnetic-fields, electric-circuits, electric-fields, electromagnetic-induction
Title: Infinite EMF produced in transformer If I have an ideal lossless transformer, where the ratio of voltages is proportional to the ratio of turns of wire, what, theoretically would stop infinite amplification of the E... | {
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"tags": "electromagnetism, magnetic-fields, electric-circuits, electric-fields, electromagn... |
hamiltonian-formalism, chaos-theory, phase-space, complex-systems, integrable-systems
Title: What is a "stochastic web"? In this lecture-video (at about 37:17) on Hamiltonian dynamics, the instructor mentions that for an (Arnold-Liouville) integrable finite-dimensional Hamiltonian system one has the following:
Phase-... | {
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electromagnetism, special-relativity, metric-tensor, tensor-calculus, conventions
$$
F^{\mu\sigma} = -\bar F^{\mu\sigma}
$$
as
$$
\bar\eta_{\nu\lambda}\eta^{\lambda\sigma} = -\delta_\nu^{\sigma}
$$
This means the signs of the components of the electromagnetic tensor $F^{\mu\nu}$ do indeed depend on the metric conventi... | {
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structural-engineering, statics
So, the introduction of a hinge gives us an extra equation, $\sum M_B=0$. This is called an equation of condition. The text mentions that only a sum of moments on one side of the hinge counts as a new equation, as the moment sums on either sides mean the same thing.
Let's say we have a ... | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "structural-engineering, statics",
"url": null
} |
ros
n_priv.param<double>("frequency", freq, 10.0);
ros::Rate loop_rate(freq);
child prf_obj(n);
while(ros::ok())
{
std::cout << "loop" << std::endl;
ros::spinOnce();
loop_rate.sleep();
}
return 0;
}
For the following code I get the following results:
default parent constructor
child constructor
loop
... | {
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"openwebmath_score": null,
"tags": "ros",
"url": null
} |
relativity, warp-drives
Title: Doesn't Warp theory violate causality? I have heard many physicists (ex:- Michio Kaku) saying "Warp speed" from Star Trek doesn't violate any known physical laws. But doesn't it violate causality?
Say, we make warp drive possible and travel towards Alpha Centauri (4.22 light years away)... | {
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"openwebmath_score": null,
"tags": "relativity, warp-drives",
"url": null
} |
performance, array, vba, modules
Still, this feels pretty clunky. Why does the i mod 4 give a non-result?
categoryByRow = categoryByRow - 1
If categoryByRow < 0 Then categoryByRow = 3
And your finalColumn also give a non-result? I think there must be a way to refactor that, but I can't figure out the relationship of ... | {
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"openwebmath_score": null,
"tags": "performance, array, vba, modules",
"url": null
} |
quantum-mechanics, homework-and-exercises, hilbert-space, notation, perturbation-theory
$$\frac{\partial}{\partial t}|\psi\rangle=-\frac{i}{\hbar}H|\psi\rangle.$$
Therefore,
$$\frac{\partial^2}{\partial t^2}|\psi\rangle=-\frac{i}{\hbar}\frac{\partial}{\partial t}(H|\psi\rangle)=-\frac{i}{\hbar}\dot{H}|\psi\rangle-\fra... | {
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"tags": "quantum-mechanics, homework-and-exercises, hilbert-space, notation, perturbation-t... |
homework-and-exercises, differential-geometry, vector-fields
Title: The flux of a vector field through a cylinder
The question is by using Gauss’ Theorem calculate the flux of the vector field
$$\overrightarrow{F} = x \hat{i} + y \hat{j}+ z \hat{k}$$
through the surface of a cylinder of radius $A$ and height $H... | {
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"tags": "homework-and-exercises, differential-geometry, vector-fields",
"url": null
} |
Again, to verify the expectation, I wrote this simple Monte Carlos simulation to prove that the bound is indeed the case.
using System;
using System.Linq;
class Program
{
static void Main(string[] args)
{
Random random = new Random();
int NUM_EXPERIMENT = 1000000;
int d = 0;
for (int e = 0; e < NUM_EXPERIMENT; e++)
{... | {
"domain": "blogspot.com",
"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9790357591818726,
"lm_q1q2_score": 0.800434650163829,
"lm_q2_score": 0.817574478416099,
"openwebmath_perplexity": 1881.7240111475903,
"openwebmath_score": 0.6285333633422852,
"tags": nu... |
multiplication states that when 1 is multiplied by any real number, the To multiply any two matrices, we should make sure that the number of columns in the 1st matrix is equal to the number of rows in the 2nd matrix. However, matrix multiplication is not defined if the number of columns of the first factor differs from... | {
"domain": "afd-hamburg-nord.de",
"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9678992932829918,
"lm_q1q2_score": 0.8086639251119909,
"lm_q2_score": 0.8354835371034369,
"openwebmath_perplexity": 509.95929793917867,
"openwebmath_score": 0.7051602005958557,
"... |
example
fcontour(___,Name,Value) specifies line properties using one or more name-value pair arguments.
fcontour(ax,___) plots into the axes specified by ax instead of the current axes.
example
fc = fcontour(___) returns a FunctionContour object. Use fc to query and modify properties of a specific FunctionContour ob... | {
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"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9838471670723234,
"lm_q1q2_score": 0.8599584132329863,
"lm_q2_score": 0.8740772368049823,
"openwebmath_perplexity": 4924.7807914964405,
"openwebmath_score": 0.5267122983932495,
"tags":... |
speed, interstellar-travel, space-probe
Title: Speed comparison of both voyagers I came across this page which provides (mostly extrapolated) speeds of both voyagers. Assuming they are fairly accurate, any reason why the speed of Voyager 2 (5-6 km/sec) is less than that of Voyager 1 (13 km/sec). If you notice carefull... | {
"domain": "astronomy.stackexchange",
"id": 421,
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"tags": "speed, interstellar-travel, space-probe",
"url": null
} |
c++, windows, embedded
m_strStatus += activeWindowTitle.c_str();
ProcessNameTrim(processName, activeWindowTitle);
m_strStatus.Append("\nTrimmed:");
m_strStatus += processName.c_str();
m_strStatus.Append("\nTrimmed:");
m_strStatus += activeWindowTitle.c_str();
}
void CSysLat_SoftwareDlg::R_StrOSD() ... | {
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"openwebmath_score": null,
"tags": "c++, windows, embedded",
"url": null
} |
space, water
Title: What would happen if we released water into deep space? If we went to deep space by a spacecraft and released water into space, what would happen? Would the water freeze to ice or would it remain as a liquid? Liquid water can't exist in a vacuum. Water in space (atmosphere, no gravity) tends to fo... | {
"domain": "astronomy.stackexchange",
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"lm_q2_score": null,
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"openwebmath_score": null,
"tags": "space, water",
"url": null
} |
javascript, jquery, animation
Title: Yes/no confirmation buttons on a slide-out panel I have the following js code and am wondering how I can make it clean. It works fine but there are few repetitions. Is there a way to make it more clean?
$('.js-decline-button').click(function() {
$('.js-confirmation').show().s... | {
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"tags": "javascript, jquery, animation",
"url": null
} |
beginner, io, rust
However, treating one character as one byte is a bad idea because strings are UTF-8 encoded. UTF-8 is a variable-length encoding. You can use char_indices instead.
It's slightly more efficient to take a slice of the string, instead of drain and collect here. It avoids one extra allocation.
Change yo... | {
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"openwebmath_score": null,
"tags": "beginner, io, rust",
"url": null
} |
thermodynamics
Now your question in the other post asked about why the lid would "stick" to the pot. In that case the notion is that the lid acts as a one way valve. It lets pressure above ambient out, but then seals if the pressure inside the headspace is below ambient pressure. So as some of the water turns to vapor... | {
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"openwebmath_score": null,
"tags": "thermodynamics",
"url": null
} |
homework-and-exercises, cosmology, space-expansion, estimation
$\ln(2) = \frac{1}{13,177,793,646}\times t$
$t = 9,134,150,511 \text{ yr}$
So it would take 9 billion years for the distance between any two points in space to double in length?
If this is so, when two points in 3D space double in distance apart, the space... | {
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"openwebmath_score": null,
"tags": "homework-and-exercises, cosmology, space-expansion, estimation",
"url": null
} |
algorithm, swift
let downwardMovement10 = items.data[10].close < items.data[9].close ? (items.data[9].close - items.data[10].close) : 0
let upwardMovement11 = items.data[11].close > items.data[10].close ? (items.data[11].close - items.data[10].close) : 0
let downwardMovement11 = items.data[11].close < items.da... | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "algorithm, swift",
"url": null
} |
beginner, bash
Basically, I call git status -s, save the output as a variable, then grep it to get lists of filenames of modified, deleted, untracked, and added.
I then parse each line individually and set $ to the respective file in absolute paths.
Now, much of the parsing is the same. Things that vary are env var pr... | {
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"openwebmath_score": null,
"tags": "beginner, bash",
"url": null
} |
c++, rational-numbers, c++17
Title: A minimal Fraction class in C++ I am trying to learn idiomatic Modern C++. I was wondering how you would improve upon this Fraction class. I would really appreciate any help with code organization, cleanliness and anything else that I should keep in mind.
Header:
#ifndef FRACTION_H
... | {
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"tags": "c++, rational-numbers, c++17",
"url": null
} |
-
+1 best answer. Please relocate green checkmark here. No deeper analysis is required here than this. No binomial probabilities, divisions into cases, induction, etc. – Kaz Apr 22 '12 at 18:41
@Kaz I'm inclined to agree with you. If it were my decision, I'd mark this the best answer, and if not this, then the next mos... | {
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"openwebmath_perplexity": 202.5839932757595,
"openwebmath_score": 0.881656289100647,
"tags... |
python, beginner, python-3.x, calculator, tkinter
self.expression = self.e.get()
self.newtext=self.expression.replace(self.newdiv,'/')
self.newtext=self.newtext.replace('x','*')
def equals(self):
"""when the equal button is pressed"""
self.getandreplace()
try:
self.value= eval(self.newtext) #evaluate ... | {
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"openwebmath_score": null,
"tags": "python, beginner, python-3.x, calculator, tkinter",
"url": null
} |
the vector magnitude (length) step-by-step. 0 Solvers. com/patrickjmt !! Vectors - Finding Magnitude or Length. These are represented by integers ranging from 1 to 5, where 1 is the variable, 2 is the variable, 3 is the first field component, 4 is the second field component, and 5 is the vector magnitude. |v| = √(v1 2 ... | {
"domain": "anev.pw",
"id": null,
"lm_label": "1. YES\n2. YES\n\n",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.97594644290792,
"lm_q1q2_score": 0.8153871921409579,
"lm_q2_score": 0.8354835432479661,
"openwebmath_perplexity": 451.9544297704632,
"openwebmath_score": 0.7642053961753845,
"tags": null... |
discrete-signals, signal-analysis, image-processing, continuous-signals
Title: What is the difference between a one dimensional and a two dimensional signal? If a signal depends on only one variable then we call it one dimensional, and if a signal depends on two variable we call it a two dimensional signal.
But when w... | {
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"openwebmath_score": null,
"tags": "discrete-signals, signal-analysis, image-processing, continuous-signals",
"url": null... |
greens-functions
$$\int_\mathcal{M} dx\, a(x,x')\nabla^2\delta(x-y)=\int_\mathcal{M} dx\, \nabla^2\Big(a(x,x')\Big)\delta(x-y)=\nabla_y^2 \,a(y,x'),\tag{2}$$
where $\nabla_y^2$ means Laplacian with respect to the $y$ variables. The equation $(1)$ becomes $$\nabla_y^2a(y,x')=\delta(y-x').\tag{3}$$
There is a well known... | {
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"openwebmath_score": null,
"tags": "greens-functions",
"url": null
} |
### $$\star$$ Spring 2019 #5
Let $$R$$ be an integral domain. Recall that if $$M$$ is an $$R{\hbox{-}}$$module, the rank of $$M$$ is defined to be the maximum number of $$R{\hbox{-}}$$linearly independent elements of $$M$$ .
• Prove that for any $$R{\hbox{-}}$$module $$M$$, the rank of $$\operatorname{Tor}(M )$$ is 0... | {
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"lm_q1q2_score": 0.8030827774478073,
"lm_q2_score": 0.8104789132480439,
"openwebmath_perplexity": 362.4303021135475,
"openwebmath_score": 0.9997151494026184,
"tags":... |
ros, c++, opencv
Title: Convert CameraInfo K & D to OpenCV format convenience functions?
Are there existing functions to convert from camera info arrays of K and D to intrinsic and distortion cv::Mats that can be passed into opencv functions like projectPoints()?
I'm interested in C++ mainly but python would also be ... | {
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"tags": "ros, c++, opencv",
"url": null
} |
f''(x) of some common functions. The sign of the second derivative tells us whether the slope of … So the fact that the second derivative, so H prime prime of eight is less than … A stationary point on a curve occurs when dy/dx = 0. The Second Derivative Test. If the second derivative is positive/negative on one side o... | {
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"id": null,
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"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.97364464791863,
"lm_q1q2_score": 0.8155441962625884,
"lm_q2_score": 0.8376199653600371,
"openwebmath_perplexity": 489.4998147384323,
"openwebmath_score": 0.769104540348053,
... |
acoustics
Title: If we hear a noise long enough, is it going to settle as tinnitus? Some equipment sometimes have a high pitch ringing, and I was wondering out of curiosity: can noises (not only drive you crazy but also) settle and become permanent ringing in your ear if you are exposed long enough? No. Tinnitus may o... | {
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"openwebmath_score": null,
"tags": "acoustics",
"url": null
} |
gazebo, rviz, moveit, ros-melodic
<!-- MoveGroup capabilities to load -->
<param name="capabilities" value="move_group/MoveGroupCartesianPathService
move_group/MoveGroupExecuteTrajectoryAction
move_group/MoveGroupKinematicsService
move_group/MoveGro... | {
"domain": "robotics.stackexchange",
"id": 33063,
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"lm_q2_score": null,
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"tags": "gazebo, rviz, moveit, ros-melodic",
"url": null
} |
Score 3
A triple and a single: $aaab$
There are 4 choices of who gets the triple.
Number of ways: . $4\cdot(6\cdot5) \;=\;{\color{blue}120}$
Score 4
A quadruple: $aaaa$
The only choice is the value of the quadruple.
Number of ways: . ${\color{blue}6}$
Check: . $360 + 720 + 90 + 120 + 6 \;=\;{\bf1296}$
Ah, yes that's... | {
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"lm_q2_score": 0.8633916134888614,
"openwebmath_perplexity": 1668.3018781768037,
"openwebmath_score": 0.8180426955223083,
"ta... |
thermodynamics, entropy, reversibility, adiabatic
Title: Principle of Caratheodory and The Second Law of Thermodynamics Background
Constantin Carathéodory formulated thermodynamics on a purely mathematical axiomatic foundation. His statement of the second law is known as the Principle of Carathéodory, which may be for... | {
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"openwebmath_score": null,
"tags": "thermodynamics, entropy, reversibility, adiabatic",
"url": null
} |
php, object-oriented, mysql, api, rest
$inputsAreValid = $this->Validator->checkInputsAreValid(array(array("input" => $facebookUserID, "minLength" => 10, "maxLength" => 30),
array("input" => $facebookName, "minLength" => 2, "maxLength" => 40),
... | {
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"lm_q2_score": null,
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"openwebmath_score": null,
"tags": "php, object-oriented, mysql, api, rest",
"url": null
} |
quantum-mechanics, probability, fermis-golden-rule
Title: Confusion regarding the definition of Fermi's Golden rule In Wikipedia, the definition starts in the following way:
"In quantum physics, Fermi's golden rule is a formula that describes the transition rate (the probability of a transition per unit time) from on... | {
"domain": "physics.stackexchange",
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"openwebmath_score": null,
"tags": "quantum-mechanics, probability, fermis-golden-rule",
"url": null
} |
c++, sorting, vectors
public:
explicit comp(bool descending = false)
: desc(descending)
{ }
bool operator()(const T& f, const T& g) const
{
return (desc) ? great(f, g) : less(f, g);
}
};
The downside of this is that a comp object will be at least sizeof(greater + less + bool). This ... | {
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"openwebmath_score": null,
"tags": "c++, sorting, vectors",
"url": null
} |
Examples – 2D plots. Diagram scicos_diagram - Define a scs_m structure This is an official page for RTSX (Robotic Tools for Scilab/Xcos), an open-source software written in Scilab language to support robot analysis and control courses. In fact, you made your first matrix by concatenating its individual elements. It wor... | {
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"lm_q1_score": 0.9433475683211323,
"lm_q1q2_score": 0.8073651018048328,
"lm_q2_score": 0.8558511506439707,
"openwebmath_perplexity": 3828.1249397353417,
"openwebmath_score": 0.40898624062538147,
"t... |
cc.complexity-theory, co.combinatorics, np-hardness, permutations
The holes must be filled in the rest of the permutation.
3) using a large enough 1SEQ, followed by a 1SEQ with some holes, followed by another large 1SEQ you can build a forced line;
4) putting together many forced lines you can build a permutation grid... | {
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"url": null
... |
biochemistry, neurotransmitter, synapses
Title: What's the difference between Cytoplasmic pool and Granular storage pool? What's the difference between Cytoplasmic pool and Granular storage pool when speaking about neurotransmitters and synaptic cleft. I encountered this here:
Amphetamine’s mechanism of action
thus... | {
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"tags": "biochemistry, neurotransmitter, synapses",
"url": null
} |
python, pandas, matplotlib
'''
Here's the path to all the data. The data were copied from http://www.presidency.ucsb.edu/data/popularity.php and saved as tsv
files.
'''
djt_path = os.getcwd() + '/data/djt.tsv'
bho_path = os.getcwd() + '/data/bho.tsv'
gwb_path = os.getcwd() + '/data/gwb.tsv'
wjc_path = os.getcwd() + '... | {
"domain": "codereview.stackexchange",
"id": 25193,
"lm_label": null,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "python, pandas, matplotlib",
"url": null
} |
performance, vba, excel
Sheets("CE1 Data").Range("K2:S1400").Clear
Set rngQuantityCells = Sheets("CE1 Data").Range("B120", Range("B120").End(xlDown))
For Each rngSinglecell In rngQuantityCells
If rngSinglecell.Value = "Primary" Then
Range(Range("A" & rngSinglecell.Row), Range("D" & rngSinglecell.Ro... | {
"domain": "codereview.stackexchange",
"id": 23368,
"lm_label": null,
"lm_name": null,
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"lm_q2_score": null,
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"openwebmath_score": null,
"tags": "performance, vba, excel",
"url": null
} |
javascript, object-oriented, heap-sort
Title: Min-Heap in JavaScript As part of my study on fundamentals, I have implemented the following code in JavaScript for a MinHeap data structure.
Please have a look and I look forward to your feedback for any improvements.
const swap = require('../swap');
function Heap(){
... | {
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"openwebmath_score": null,
"tags": "javascript, object-oriented, heap-sort",
"url": null
} |
c++, strings, template, stl, casting
int length = ::WideCharToMultiByte( codePage, 0, pSource, sourceLength, NULL, 0, NULL, NULL );
if( length == 0 )
{
return std::string();
}
std::vector<char> buffer( length );
::WideCharToMultiByte( codePage, 0, pSource, sourceLength, &buffer[ 0 ], lengt... | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "c++, strings, template, stl, casting",
"url": null
} |
c#, generics, enum
Title: Single Flag Only Enum (RestrictedEnum) This class simply allows you to use an enum while only allowing you to set a single flag. If multiple flags are set they will be rejected--unless the total of the combined flags is the same value of an existing flag. Such as Flag1 | Flag2 == Flag3 would ... | {
"domain": "codereview.stackexchange",
"id": 18670,
"lm_label": null,
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"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "c#, generics, enum",
"url": null
} |
python, cryptography, aes
That's because the counter method adds 1 to every byte in the array, wrapping around every 255 additions. So the array only gets 255 different values before it starts to repeat.
This is disastrous for the security of the message because if the message is long enough (more than 255 blocks or 4... | {
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"id": 20363,
"lm_label": null,
"lm_name": null,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "python, cryptography, aes",
"url": null
} |
it is easy to transpose a! Square matrices ) to ensure you get the best experience on our website rows! Array of numbers arranged in rows and columns into rows ( also called transpose of the matrix along the entries. However, to properly illustrate that this is pretty intuitive, since all 're... Mat2 must come out as a... | {
"domain": "thelaunchpadtech.net",
"id": null,
"lm_label": "1. Yes\n2. Yes",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9861513897844355,
"lm_q1q2_score": 0.8749180416467133,
"lm_q2_score": 0.8872045922259088,
"openwebmath_perplexity": 611.8573612009685,
"openwebmath_score": 0.6608235836029053,
"... |
def nadaraya_watson(x_train, y_train, x_val, kernel):
dists = tf.reshape(x_train, (-1, 1)) - tf.reshape(x_val, (1, -1))
# Each column/row corresponds to each query/key
k = tf.cast(kernel(dists), tf.float32)
# Normalization over keys for each query
attention_w = k / tf.reduce_sum(k, 0)
y_hat = tf.transpose(tf.transpose(... | {
"domain": "d2l.ai",
"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9830850872288502,
"lm_q1q2_score": 0.8432590269546604,
"lm_q2_score": 0.8577680995361899,
"openwebmath_perplexity": 12943.151166677042,
"openwebmath_score": 0.7578228712081909,
"tags": null,
... |
javascript, jquery, animation
//Adjust the image reel to its new size
$(".image_reel").css({ 'width': divReelWidth });
}
This achieves 2 things:
a. First, it groups a block of code that is logically cohesive, removing it from the main code which results in a much cleaner code habitat.
... | {
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"lm_q2_score": null,
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"openwebmath_score": null,
"tags": "javascript, jquery, animation",
"url": null
} |
ros-melodic, docker, rosrun
Originally posted by gvdhoorn with karma: 86574 on 2020-04-22
This answer was ACCEPTED on the original site
Post score: 2
Original comments
Comment by gvdhoorn on 2020-04-22:
PS: technically this isn't really a ROS problem, but caused by the way Docker (builds) work(s).
Comment by Julian98... | {
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "ros-melodic, docker, rosrun",
"url": null
} |
special-relativity, representation-theory, dirac-equation, dirac-matrices, clifford-algebra
\sigma^k & 0 \\
0 & \sigma^k \\
\end{matrix}}\quad\text{ and }\quad J^{i0}=\frac{i}{2}\pmatrix{\begin{matrix}
\sigma^i & 0 \\
0 & -\sigma^i \\
\end{matrix}}.$$
We see that the matrices of the generators ar... | {
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"openwebmath_score": null,
"tags": "special-relativity, representation-theory, dirac-equation, dirac-matrices, cliffor... |
experimental-physics, electric-circuits, electrons, semiconductor-physics, solar-cells
Title: Photovoltaic cell - why is I-V curve so strange Today I was doing practicals with PV cells and my team was measuring IV curve of a solar cell. The cell was not homogenously illuminated and the illumination was very strong.
Ou... | {
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"tags": "experimental-physics, electric-circuits, electrons, semiconductor-physics, solar-c... |
Originally Posted by Soroban
...
We have: . $y\;=\;x^2 + 4x - 9$
Take one-half of the x-coefficient and square it:
. . $\frac{1}{2}(4) = 2\quad\Rightarrow\quad 2^2 = 4$
On the right side, add 4 and subtract 4:
. . . $y \;= \;x^2 + 4x$ + 4 $+\, 9$ - 4
And we have: . $y \;\:= \;\:(x + 2)^2 \,+ \,5$
. . . . . . . . . ... | {
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"lm_q1q2_score": 0.8163811371294295,
"lm_q2_score": 0.8333245891029456,
"openwebmath_perplexity": 884.456334511318,
"openwebmath_score": 0.8848561644554138,
"tags... |
temporal-logic
Then A and B both satisfy the formula: Both have an initial state that is not labeled with $\varphi_1 = p$. Hence both initial states satisfy the CTL state formula $\varphi_1 \rightarrow AG(\varphi_2)$. Therefore, it is true that all paths starting from their initial states eventually (in this case imme... | {
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "temporal-logic",
"url": null
} |
javascript, game, node.js, electron
'use strict';
const data = {
titleMessage: 'Welcome to ProceduralTA!',
introMessage: 'You are in a room.'
};
const ui = new (function UI(){
const inputBox = $('#input-box');
const log = $('#log');
const charDelay = 10;
this.logMessage = async function logMessage(mes... | {
"domain": "codereview.stackexchange",
"id": 40351,
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "javascript, game, node.js, electron",
"url": null
} |
rviz, robot-state-publisher, ros-indigo
Title: Rviz reporting no fixed frame
I'm trying to complete the robot state publisher tutorial, but when I run:
roslaunch myrobot_description myrobot_rviz.launch
Rviz shows no model and in the left-hand panel reports the error "Fixed Frame [map] does not exist".
myrobot.urdf.x... | {
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"openwebmath_score": null,
"tags": "rviz, robot-state-publisher, ros-indigo",
"url": null
} |
ros-melodic
So this confirms the conflict between libraries, so since I have loaded the openCV 4.3 (with the third party library) I would say that the libopencv_core.so.3.2 is loaded because of the cv_bridge package. cv_bridge is used to get the image from the sensor_msgs::ImageConstPtrand this image is given as an ar... | {
"domain": "robotics.stackexchange",
"id": 34981,
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"lm_q1_score": null,
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"lm_q2_score": null,
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"openwebmath_score": null,
"tags": "ros-melodic",
"url": null
} |
This follows quite straightforwardly from my answer to your prior question. Recall that the radix $\rm\:b\:$ digit string $\rm\ d_n\ \cdots\ d_1\ d_0\$ denotes a polynomial expression $\rm\ P(b)\ =\ d_n\ b^n +\:\cdots\: + d_1\ b + d_0\:,\$ where $\rm\:\ P(x)\: =\ d_n\ x^n +\:\cdots\: d_1\ x + d_0\:.\:$ The reversed dig... | {
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"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9802808690122164,
"lm_q1q2_score": 0.812592857450576,
"lm_q2_score": 0.8289388104343892,
"openwebmath_perplexity": 360.6525738877354,
"openwebmath_score": 0.811278223991394,
"tags"... |
computation-models, model-checking
xr in; /* exclusive recv access to channel in */
xs out; /* exclusive send access to channel out */
printf("MSC: %d\n", mynumber);
out!one(mynumber);
end: do
:: in?one(nr) ->
if
:: Active ->
if
:: nr != maximum ->
... | {
"domain": "cs.stackexchange",
"id": 4478,
"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": "computation-models, model-checking",
"url": null
} |
programming, qiskit, ibm-q-experience
When you click on ibmqx2, this page is shown:
So, it means that ibmqx2 and Yorktown are identical devices.
The naming is just a legacy of former times.
I would be happy if anybody from IBM can add more comments. | {
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"id": 3012,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "programming, qiskit, ibm-q-experience",
"url": null
} |
c++, memory-management, thread-safety
Item's move constructor should std::move the object
If you are moving one Item into another, it makes sense to also use move-assignment on object. It should be as simple as:
object = std::move(other.object) | {
"domain": "codereview.stackexchange",
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "c++, memory-management, thread-safety",
"url": null
} |
Boxplot: whiskers and outliers doubt
I have a doubt on boxplot.
I'll expose my knowledge and then my doubt.
$x=\left\{{x}_{1},{x}_{2}...{x}_{n}\right\}$: the set of samples
${q}_{1}$,${q}_{3}$: the first and third quartiles
${w}_{l}$,${w}_{u}$: the lower and upper whiskers
$IQR={q}_{3}-{q}_{1}$
box extends from ${q}_{1... | {
"domain": "plainmath.net",
"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9817357237856483,
"lm_q1q2_score": 0.8026420701346391,
"lm_q2_score": 0.8175744761936437,
"openwebmath_perplexity": 1058.0931097113137,
"openwebmath_score": 0.7831717729568481,
"tags":... |
c, parsing, functional-programming, lazy
int test_regex(){
parser a;
PRINT( a = regex( "\\." ) );
PRINT( parse( a, chars_from_string( "a" ) ) );
PRINT( parse( a, chars_from_string( "." ) ) );
PRINT( parse( a, chars_from_string( "\\." ) ) );
parser b;
PRINT( b = regex( "\\\\\\." ) );
PRINT( parse( b, ch... | {
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "c, parsing, functional-programming, lazy",
"url": null
} |
gamma-ray-bursts, seti
The other method would be an internal nuclear engine, well insulated that generates electricity and electricity generates magnetic fields and presumably ion thrusters that push the ship. We wouldn't detect nuclear energy if it's internal and insulated.
The Orion ship that you mention in your... | {
"domain": "astronomy.stackexchange",
"id": 3051,
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "gamma-ray-bursts, seti",
"url": null
} |
c#, cache
I already said in a non-multi threaded environment how 1 & 2 can cause issue. In a multi threaded a thread 1 could be doing step 3 and thread 2 could check step 1 and it will return it's not in the cache. Then thread 2 skips to step 3, because it's not in the cache yet because thread 1 hasn't saved it ther... | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "c#, cache",
"url": null
} |
c++, comparative-review
You could even modernize the signature a bit more, with auto:
template <typename T, std::size_t N>
auto max(const T (&array) [N]);
but it's more a matter of taste.
So now that your signature is simplified and takes care of determining the size of the array without sizeof arithmetic, let's move... | {
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"id": 29740,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "c++, comparative-review",
"url": null
} |
This is done using additivity of integration on intervals i.e. if $c \in [a,b]$ and
$\displaystyle \int_a^b f(x) dx$, $\displaystyle \int_a^c f(x) dx$ and $\displaystyle \int_c^b f(x) dx$ are well- defined, then $$\int_a^b f(x) dx = \int_a^c f(x) dx + \int_c^b f(x) dx$$ Hence, in your case, you have that $$\int_1^5 f(... | {
"domain": "stackexchange.com",
"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9883127433812522,
"lm_q1q2_score": 0.8638616588662673,
"lm_q2_score": 0.8740772236840656,
"openwebmath_perplexity": 564.9705017758622,
"openwebmath_score": 0.9622020721435547,
"tag... |
statistical-mechanics, entropy, information, arrow-of-time
EDIT: To be more specific, the Second Law of Thermodynamics describes entropy as increasing "over time." By "over time," I assume it means "as we observe the past, followed by the future." My question is this: given conservation of information, is there an equ... | {
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"id": 31445,
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"lm_q2_score": null,
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"openwebmath_score": null,
"tags": "statistical-mechanics, entropy, information, arrow-of-time",
"url": null
} |
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