text stringlengths 49 10.4k | source dict |
|---|---|
This approximation will be good providing the higher order terms (m = 3, 4, etc.) have much smaller values than the m = 2 term here.
We can now take the exponential of L(q) to get back to f(q):
where K is a normalizing constant. Now, the Normal(m,s) distribution has probability density function f(x) given by:
Compar... | {
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"openwebmath_score": 0.9310901165008545,
"tags... |
performance, c, game, snake-game
GotoXY(body[len].x,body[len].y);
printf("*");
len++;
if(len==length)
break;
}
}
else if(bend[i].y==bend[i-1].y)
{
diff=bend[i]... | {
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"tags": "performance, c, game, snake-game",
"url": null
} |
galaxy, spectra, python
Title: Efficient method for generating combined spectra from N-body simulation data using Python (convolution) (I asked this same question also in StackOverflow, due to being both astronomy/coding problem, here link : https://stackoverflow.com/questions/78166419/efficient-method-for-generating-... | {
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"openwebmath_score": null,
"tags": "galaxy, spectra, python",
"url": null
} |
ros-hydro, ubuntu-precise, ubuntu
Title: Problem while trying object recognition
Hi everyone!
I want to try the object recognition kitchen on my ubuntu 12.04 and ros hydro. I followed the install tuto (http://wg-perception.github.io/object_recognition_core/install.html#install ), so I've done this for install:
$ cd c... | {
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"tags": "ros-hydro, ubuntu-precise, ubuntu",
"url": null
} |
ros, rosparam, baxter
Title: I am having truble with geting the software version in Baxter
Hello,
I am new to Baxter and I have trouble getting the software version for Baxter.
I am trying to execute this commend
rosparam get /rethink/software_version
but I get this error
ERROR: Parameter [/rethink/software_version]... | {
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"tags": "ros, rosparam, baxter",
"url": null
} |
# Finding the error in this proof that 1=2
I have a "proof" that has an error in it and my goal is to figure out what this error is. The proof:
If $x = y$, then
$$\begin{eqnarray} x^2 &=& xy \nonumber \\ x^2 - y^2 &=& xy - y^2 \nonumber \\ (x + y)(x - y) &=& y(x-y) \nonumber \\ x + y &=& y \nonumber \\ 2y &=& y \non... | {
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"lm_q2_score": 0.8354835411997897,
"openwebmath_perplexity": 497.30267751472945,
"openwebmath_score": 0.7686850428581238,
"ta... |
proteins, transcription, protein-expression
Title: Is alternative splicing possible in the same cell? I know alternative splicing is possible in different cell types of an organism, or within the same cell at different developmental stages. There are several examples like this. But are there any instances of alternati... | {
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"tags": "proteins, transcription, protein-expression",
"url": null
} |
c++, object-oriented, c++11, game
Use standard exceptions
Instead of using the two exception classes defined in the current code, just use std::runtime_error which eliminates redundant code and simplifies. Alternatively derive your custom classes from std::runtime_error if you really need to distinguish between them.... | {
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"tags": "c++, object-oriented, c++11, game",
"url": null
} |
Generalising your "square is the inverse of square root" leads to reciprocal exponents being the inverse of exponents, so $3^5 = 243$ corresponds to $3 = 243^{1/5}$.
Alternatively $3^5 = 243$ corresponds to $5 =\log _{3} 243 = \frac{\log _{10} 243}{\log _{10} 3}= \frac{\log _{e} 243}{\log _{e} 3}$ using logarithms.
L... | {
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"lm_q2_score": 0.875787001374006,
"openwebmath_perplexity": 447.85770646773545,
"openwebmath_score": 0.8837385773658752,
"tag... |
electrochemistry, hydrogen, fuel, oxygen
Title: Is it possible to make a reversible "Solid State" Hydrogen fuel cell using Ammonia Borane and Iron Oxide? Well, I saw this video about hydrogen reduction, in which pure hydrogen gas is exposed to iron oxide at high temperatures, producing water vapor and leaving pure iro... | {
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"tags": "electrochemistry, hydrogen, fuel, oxygen",
"url": null
} |
quantum-mechanics, operators, hilbert-space, heisenberg-uncertainty-principle
This is a quadratic equation in $\lambda$. The positive definite condition of the quaratic implies that its discriminant must be $\leq0$,
$$b^2 - 4 {{(\Delta{A})}^{2}} {{(\Delta{B})}^{2}} \leq 0$$
$${{(\Delta{A})}^{2}} {{(\Delta{B})}^{2}} \g... | {
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"tags": "quantum-mechanics, operators, hilbert-space, heisenberg-uncertainty-principle",
... |
Seven-game series: . $\_\:\_\:\_\:\_\:\_\:\_\:W$
The first six games must have three W's and three L's in some order.
There are: . ${6\choose3,3} = {\color{red}20}$ ways.
Therefore, there are: . $1 + 4 + 10 + 20 \:=\:{\color{blue}35}$ ways. | {
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"openwebmath_score": 0.37284570932388306,
... |
javascript, object-oriented, game
while (isSunk == false) {
guess = prompt("Enter a guess between 1 and 6");
if (guess < 0 || guess > 6) {
alert("Enter a valid number between 0 and 6");
}else if(guess > 0 || guess < 6) {
guessCheck= guessarr.indexOf(guess);
if (guessCheck >= 0) {
... | {
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"tags": "javascript, object-oriented, game",
"url": null
} |
c++, optimization, beginner, array
output[i] = real;
}
return output;
}
private:
static const unsigned ONE;
static const unsigned ZERO;
};
const unsigned Manchester::ONE = 1u;
const unsigned Manchester::ZERO = 2u;
int main()
{
typedef std::vector<unsigned> vec_t;
// Some un... | {
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"openwebmath_score": null,
"tags": "c++, optimization, beginner, array",
"url": null
} |
ros, roboearth, compilation
Originally posted by Gaëtan on ROS Answers with karma: 56 on 2012-04-24
Post score: 0
Original comments
Comment by Bence Magyar on 2012-04-24:
Please also provide the distribution and Ubuntu version you are using.
It's working know
executing :
apt-get install ros-electric-client-rosjava-j... | {
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"tags": "ros, roboearth, compilation",
"url": null
} |
standard-model, vectors, spinors, dirac-matrices, clifford-algebra
Most of times, we go back/forth (and get away with it) between the external and internal spaces (e.g. Kahler-Dirac fermion) without explicitly mentioning it, thanks to the soldering 1-form vielbein/frame/tetrad $e$, which is a vector in spacetime manif... | {
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"tags": "standard-model, vectors, spinors, dirac-matrices, clifford-algebra",
"url": null... |
kinect, turtlebot, openni-kinect, openni-camera
WARNING The following nodes are unexpectedly connected:
* unknown (http://172.20.11.199:43213/)->/turtlebot_dashboard_17832_1323464372482 (/diagnostics_agg)
* unknown (http://172.20.11.199:56364/)->/turtlebot_dashboard_17832_1323464372482 (/diagnostics_agg)
* unknown ... | {
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"tags": "kinect, turtlebot, openni-kinect, openni-camera",
"url": null
} |
sql, stackexchange, t-sql
Title: Excuse me, how many of you are new here? Mind if I JOIN you? I had perceived an uptick in new reviewers around here, and I wanted to see if the data backed that observation up. It's been a while since I've written any SQL, so this was a nice little exercise in using the Stack Exchange ... | {
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"tags": "sql, stackexchange, t-sql",
"url": null
} |
machine-learning, decision-trees
Title: Decision Tree split error During the split function of the decision tree, I am getting an assertion error stating:
Error > Assert: type(C) == dict
I couldn't find any errors in the code up until now. Could you please correct it if there is any problem with it?
My code:
def spli... | {
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} |
snr, quantization, cosine, thd
5&15.2007181331955&15.1907044658090&-31.8098475&-31.6159563&-31.3681507\\
6&31.1888756714257&31.1838597476996&-37.9357894&-37.8138122&-37.5642711\\
7&63.1800835394190&63.1775601103885&-43.9857175&-43.9071306&-43.6902709\\
8&127.173613625523&127.172343338577&-50.0049084&-49.9531877&-49.77... | {
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"tags": "snr, quantization, cosine, thd",
"url": null
} |
c#, dynamic-programming, wrapper
This initialization is to avoid repeating the constructor in both
child classes, since they are the same except for the class they use,
but it does have a virtual member call in the constructor. Is this a
good idea?
Is this a good use of dynamic?
How else could I deal with this withou... | {
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image-processing, image-segmentation
Title: Active Contours In the below link: Active Contour
http://en.wikipedia.org/wiki/Active_contour_model
Internal Energy of the snake is
$$E_{internal}=\frac{(\alpha\,\!(s)\left | \mathbf{v}_s(s) \right \vert^2 + \beta\,\!(s)\left | \mathbf{v}_{ss}(s) \right \vert ^2)}{2}$$
Why ... | {
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} |
$W_\alpha=\cup \left\{G \in \mathcal{G}: G \subset U_\alpha \right\}$
Then $\mathcal{W}=\left\{W_\alpha: \alpha<\kappa \right\}$ is still a locally finite refinement of $\mathcal{U}$. Since the space $X$ is normal, any locally finite open cover is shrinkable. Let $\mathcal{E}=\left\{E_\alpha: \alpha<\kappa \right\}$ b... | {
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"lm_q1_score": 0.9904406000885707,
"lm_q1q2_score": 0.8317066168422892,
"lm_q2_score": 0.8397339696776499,
"openwebmath_perplexity": 638.3159881490476,
"openwebmath_score": 1.000008463859558,
"tags... |
c, wrapper, c++-cli
/// <summary>
/// The number of pages
/// </summary>
int NbPages;
/// <summary>
/// The number of "tentative" books generated (generally several thousands)
/// </summary>
int NbRun;
/// <summary>
/// The parameters for each page
/// </summary>
Parameter... | {
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"url": null
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optics, visible-light, geometric-optics, lenses
where $z_R = \frac{\lambda\,w^2}{4\,\pi\,q^2}$ is the Rayleigh length and $w$ is measured as the $1/e^2$ intensity diameter of the beam. If, however, the input beam is of uniform intensity, then the electric field pattern in the focal plane varies like
$$E(r,\,0) \appr... | {
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"tags": "optics, visible-light, geometric-optics, lenses",
"url": null
} |
c++, c++11, template-meta-programming
ExprAdd* clone() const override { return new ExprAdd(lhs_, rhs_); }
std::string as_str() const override { return lhs_.as_str() + " + " + rhs_.as_str(); }
std::size_t hash() const override { return lhs_.hash() ^ rhs_.hash(); }
};
template<typename T1, typename T2>
auto op... | {
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and for those of B $$w=av\to{(I-{1\over{1+v^tv}}{vv^t})w=av-{1\over{1+v^tv}}{vv^t}av}=av({1-{{v^tv}\over{1+v^tv}}})={1\over{1+v^tv}}av\to\lambda={1\over{1+v^tv}}$$ Then the eigenvalues are $\lambda=1$ and $\lambda={1\over{1+v^tv}}$ and the eigenvectors are all $v\in\Bbb R^n$ | {
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"openwebmath_score": 0.9518581628799438,
"ta... |
particle-physics, nuclear-physics, atomic-physics, radiation, radioactivity
Title: What is the importance of excited states in the emission of gamma radiation during alpha decay? Let's suppose that during a hypothetical alpha decay of a nucleus X, has two excited states (such as 2.3 mEV and 0.9 mEV) are respectively f... | {
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"u... |
c++, strings, c++11, converting
2. For most generic use, use a stream for output:
template<typename S, typename I, typename J>
void print_range(S& stream, I i, J j)
{
stream << *i;
if (*j != *i)
stream << "-" << *j;
}
template<typename S, typename F, typename T>
void print_ranges(S& stream, const F& f... | {
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• Pointwise and uniform convergence maths.lancs.ac.uk
• Pointwise convergence UW Computer Sciences User Pages
• Pointwise and Uniform Convergence Welcome to SCIPP
• Examples of Non-Uniform Convergence converges pointwise tof onS. 1. andthatforuniform convergence,whatwecansayisthat“foragiven ,oneN Pointwise and Unifo... | {
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"lm_q1_score": 0.9458012686491108,
"lm_q1q2_score": 0.8057780444860065,
"lm_q2_score": 0.8519528057272543,
"openwebmath_perplexity": 479.3520617740006,
"openwebmath_score": 0.8387923836708069,
"tags": null... |
\input{preamble} % OK, start here. % \begin{document} \title{Exercises} \maketitle \phantomsection \label{section-phantom} \tableofcontents \section{Algebra} \label{section-algebra} \noindent This first section just contains some assorted questions. \begin{exercise} \label{exercise-isomorphism-localizations} Let $A$ be... | {
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"lm_q1_score": 0.9873750529474512,
"lm_q1q2_score": 0.8026049065130083,
"lm_q2_score": 0.8128673133042217,
"openwebmath_perplexity": 113.17356744429497,
"openwebmath_score": 0.9986513257026672,
"tags"... |
• Really illuminating visualization. +1 Dec 24, 2014 at 8:16
• Great addition, +1, thanks. I noticed that you call $0$ a mode when the distribution goes to $+\infty$ when $x\to 0$ (and nowhere else) -- something @Alecos above (in the comments) did not want to do. I agree with you: it is convenient. Dec 24, 2014 at 10:2... | {
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"lm_q1q2_score": 0.8476223902376337,
"lm_q2_score": 0.8633916117313211,
"openwebmath_perplexity": 578.4726344361237,
"openwebmath_score": 0.8257148861885071,
"tags... |
newtonian-mechanics, rotational-dynamics, computational-physics, simulations, rigid-body-dynamics
\end{align*}
and the non holonomic constraint equation for the rolling condition.
\begin{align*}
&\dot{x}-r_y(\varphi)\,\dot\varphi=0\quad\Rightarrow\\
&\ddot{x}-r_y(\varphi)\,\ddot\varphi-\frac{d\,r_y}{d\varphi}\dot\... | {
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"tags": "newtonian-mechanics, rotational-dynamics, computational-physics, simulations, rigi... |
see it decays really fast, but it actually does not have exponential decay. For example, in algebra 2 the students will be learning about logarithms and exponentials, and will have to graph both of them and know the difference between. Exponential Growth and Decay. They asked us graph the following exponential function... | {
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"lm_q1_score": 0.9911526433490359,
"lm_q1q2_score": 0.8501791228395476,
"lm_q2_score": 0.8577681031721324,
"openwebmath_perplexity": 745.7257336556233,
"openwebmath_score": 0.5862599611282349,
"tags": ... |
javascript, beginner, jquery, game, html5
AI calculations:
function calculateAI() {
for (paddle in pAI) {
var obj = pong[paddle];
var by = ctxHD2;
if (!pAI[paddle]) {
return;
}
if (pAIOpt.miss == 0) {
switch(rand(pAIOpt.diff)) {
... | {
"domain": "codereview.stackexchange",
"id": 1397,
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"tags": "javascript, beginner, jquery, game, html5",
"url": null
} |
c++, c++11, ai
os << " [AUX]:\n" ;
os << m.auxComponents << '\n';
return os;
}
// POPULATION ===========================================================================
// ======================================================================================
Population::Population (size_t size)
: size(... | {
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"tags": "c++, c++11, ai",
"url": null
} |
python, performance, programming-challenge, python-2.x
print binom_factor(76430, 4321)
print slow_factors(76430, 4321)
power = 4
print binom_factor(20*10**power, 15*10**power) The strategy in the post is to iterate over all the numbers that are multiplied together in the numerator and denominator of the bi... | {
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"tags": "python, performance, programming-challenge, python-2.x",
"url": null
} |
> $\mathrm{IsDefinite}\left(C\right)$
${\mathrm{false}}$ (8)
> $\mathrm{IsDefinite}\left(C,'\mathrm{query}'='\mathrm{positive_semidefinite}'\right)$
${\mathrm{true}}$ (9)
> $\mathrm{IsDefinite}\left(C,'\mathrm{query}'='\mathrm{negative_semidefinite}'\right)$
${\mathrm{false}}$ (10) | {
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"openwebmath_score": 0.7373065948486328,
"tags": n... |
electromagnetism, magnetic-fields, differential-geometry, maxwell-equations
Title: Deriving the magnetic flux from the work done by the Lorentz force, using only infinitesimals The question might sound a bit strange at first so allow me to give some context. My prof has given a derivation of the magnetic flux where he... | {
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"tags": "electromagnetism, magnetic-fields, differential-geometry, maxwell-equations",
"u... |
python, performance, python-3.x, pygame, raycasting
mapBoundX = len(file)
mapBoundY = len(file[0])
mapGrid = []
for i, line in enumerate(file):
mapGrid.append([])
for j, char in enumerate(file[i]):
if char != 0:
mapGrid[i].append(char)
else:
... | {
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"tags": "python, performance, python-3.x, pygame, raycasting",
"url": null
} |
.net, security, validation, f#
By using an accumulator, and making the loop call the very last thing the loop function has to do, it can now use tail-call recursion to optimize itself into a cleaner loop.
I'm quite certain this follows the functional paradigms much more appropriately than the original. | {
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"tags": ".net, security, validation, f#",
"url": null
} |
4 Graphing Sine and Cosine Functions 487 Each graph below shows fi ve key points that partition the interval 0 ≤ x ≤ 2π — into b four equal parts. We’re going to start thinking of how to get the graphs of the functions y=sin x and yx=cos. The input to the sine and cosine functions is the rotation from the positive x-ax... | {
"domain": "adunataalpini-pordenone2014.it",
"id": null,
"lm_label": "1. Yes\n2. Yes",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9814534333179648,
"lm_q1q2_score": 0.8824457534056622,
"lm_q2_score": 0.8991213678089741,
"openwebmath_perplexity": 977.6851453625898,
"openwebmath_score": 0.64966630935... |
python, python-3.x
Title: USB stick condition check and file deleting function I have a function called USB(), that will observe a USB stick's insertion and delete files inside of it, if there are some:
import os
import shutil
# 1. Check and clean USB
def USB():
usb_inserted = os.path.isdir("F:") # <-- returns b... | {
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "python, python-3.x",
"url": null
} |
arrays, java, memory-allocation
Title: How is the formula for calculation in row/column major obtained? In my book, this formula is given for calculation of address of row major order's element $[I,J]$:
Address of $[I,J]$th element in row major order $= B + W[n(I-L_r)+ [J-L_c]]$
where B denotes base address, W denot... | {
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"openwebmath_score": null,
"tags": "arrays, java, memory-allocation",
"url": null
} |
javascript, unit-testing, dom, jasmine
/** SetAttributes */
it("should not be null because it returns an HTMLElement with newly added attributes.", function() {
expect(SetAttributes(document.createElement('div'), {
defer: true,
src: null,
type: 'text/javascript'
})).not.toBe(null);
});
... | {
"domain": "codereview.stackexchange",
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "javascript, unit-testing, dom, jasmine",
"url": null
} |
electromagnetism, electromagnetic-radiation
Title: Understanding bremsstrahlung spectrum in Landau-Lifschitz I am reading through Landau, Lifschitz "The classical theory of fields", in particular I am reading about bremsstrahlung spectrum in $\S70$ "Radiation in the case of Coulomb interaction".
The book says that the... | {
"domain": "physics.stackexchange",
"id": 68955,
"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": "electromagnetism, electromagnetic-radiation",
"url": null
} |
general-relativity, spacetime, curvature, dark-matter
Title: Could dark matter be curved pockets of spacetime left over from the big bang? My understanding of general relativity is that gravitation is equivalent to spacetime curvature and is proportional relative to localized mass. Traditionally, we conceptualize that... | {
"domain": "physics.stackexchange",
"id": 41448,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "general-relativity, spacetime, curvature, dark-matter",
"url": null
} |
c#, formatting, rational-numbers
Is everything consistent? What could be improved? @mjolka suggested to write GetGreatestCommonDenominator iteratively - I've found this code online and I find the recursive method is easier to read:
static int GetGreatestCommonDenominator(int numerator, int denominator)
{
int rema... | {
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"tags": "c#, formatting, rational-numbers",
"url": null
} |
quantum-mechanics, quantum-interpretations, interference, multiverse, identical-particles
However, this has never been turned into a coherent ontology or picture of reality. So at bottom, many worlds just consists of orthodox quantum mechanics, plus rhetoric and vague intuitions about multiple worlds. It does not cons... | {
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"tags": "quantum-mechanics, quantum-interpretations, interference, multiverse, identical-pa... |
performance, random, cython
I profiled some complex simulation code and found that about 50% of the execution time is spent in this function which is called approximately 3.5 million times. Because it is such a time hog, and such an important utility, I'd like to speed it up if possible.
One of the problems is that th... | {
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"openwebmath_score": null,
"tags": "performance, random, cython",
"url": null
} |
-
The above answer does it totally.
However you can visualize this problem graphically. Imagine the three axes $x,y,z$ and the first quadrant part of the curve $xy=1$ drawn on the $xy$ plane. The function $f(x,y)=x+y$ is plotted on the $z$-axis. The graph of this function looks like a plane which is slanted 45% to th... | {
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"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9857180694313357,
"lm_q1q2_score": 0.8298027439832814,
"lm_q2_score": 0.8418256393148982,
"openwebmath_perplexity": 463.99423556502654,
"openwebmath_score": 0.958881676197052,
"tag... |
html, css
<fieldset>
<legend>Your Contact Information</legend>
<label for="emailField">Email:</label>
<input type="email" name="email" id="emailField">
<br>
<label for="mobileField">Mobile:</label>
<input type="tel" name="mobile" id="mobileField">
<br>
<l... | {
"domain": "codereview.stackexchange",
"id": 15923,
"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": "html, css",
"url": null
} |
filters, downsampling, supersampling
Title: Perfect reconstruction ( Single Channel ) I was trying to solve the following problem .
Given an input x[n], consider upsampling by 2, followed
by interpolation with a filter having z-transform H(z) for magnification of the signal.
Then, to recover the original signal ... | {
"domain": "dsp.stackexchange",
"id": 2189,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "filters, downsampling, supersampling",
"url": null
} |
python, unit-testing, functional-programming, modules
logs_query = f"{logs_base_query} WHERE {conditions};"
else:
logs_query = f"{logs_base_query};"
dates_query = "SELECT log_id, date_not_delivered FROM undelivered_dates_logs;"
costs_query = "SELECT log_id, cost FROM cost_logs;"
with connect... | {
"domain": "codereview.stackexchange",
"id": 43355,
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"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "python, unit-testing, functional-programming, modules",
"url": null
} |
experimental-physics, space, vacuum
where $mgh$ is the gravitational energy of a nitrogen molecule. This gives
$$ H_0 = \frac{ kT}{mg } \sim 9 \text{ km} $$
The order of magnitude estimate comes out a wash (they are inherently the same calculation done two different ways), but they are a wash assuming we had a space ... | {
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"openwebmath_score": null,
"tags": "experimental-physics, space, vacuum",
"url": null
} |
ros, catkin-make, catkin, rplidar
After I input
ls -al /home/ubuntu/catkin_ws
I got below!
ubuntu@ubuntu:~/catkin_ws$ ls -al /home/ubuntu/catkin_ws
total 24
drwxrwxr-x 5 ubuntu ubuntu 4096 Jan 25 15:04 .
drwxr-xr-x 22 ubuntu ubuntu 4096 Jan 25 23:16 ..
-rw-rw-r-- 1 ubuntu ubuntu 98 Jan 24 13:34 .catkin_workspace... | {
"domain": "robotics.stackexchange",
"id": 26825,
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "ros, catkin-make, catkin, rplidar",
"url": null
} |
special-relativity, magnetic-fields, electrons
Title: Can relativity explain the magnetic attraction between two parallel electrons or electron beams comoving in a vacuum? (No wires) How can relativity explain the magnetic attraction of two electrons (or two electron beams) comoving in a vacuum at some certain constan... | {
"domain": "physics.stackexchange",
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "special-relativity, magnetic-fields, electrons",
"url": null
} |
newtonian-mechanics, conservation-laws, earth, estimation
Title: If everyone on Earth jumped at the same time, is it possible to steer the Earth? Newton's third law states that in every action, there is a equal and opposite reaction.
When we jump, we exert a force on the ground and the resultant force upwards propels ... | {
"domain": "physics.stackexchange",
"id": 77720,
"lm_label": null,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "newtonian-mechanics, conservation-laws, earth, estimation",
"url": null
} |
statistical-mechanics, condensed-matter, ising-model, eigenvalue, spin-statistics
Title: NP-completeness of non-planar Ising model versus polynomial time eigenvalue algorithms From the papers by Barahona and Istrail I understand that a combinatorial approach is followed to prove the NP-completeness of non-planar Ising... | {
"domain": "physics.stackexchange",
"id": 7756,
"lm_label": null,
"lm_name": null,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "statistical-mechanics, condensed-matter, ising-model, eigenvalue, spin-statistics",... |
special-relativity, inertial-frames, observers
Title: Relativity of simultaneity in special relativity I’ve read a lot of article about the topic and I think I understood it : according to the theory, two observers in two different frames of reference can disagree on the order of two events. For observer o1, event e0 ... | {
"domain": "physics.stackexchange",
"id": 92130,
"lm_label": null,
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"openwebmath_score": null,
"tags": "special-relativity, inertial-frames, observers",
"url": null
} |
algorithms, binary, smt-solvers
It might be helpful to use CryptoMiniSAT or some other SAT solver with built-in support for XOR (as each sum is a large XOR of boolean variables).
I'm not sure whether this will be enough to make your problem practically solvable in this way, though.
2QBF
We can formulate your problem ... | {
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"openwebmath_score": null,
"tags": "algorithms, binary, smt-solvers",
"url": null
} |
important for perfect preparation. Series Convergence Tests Math 122 Calculus III D Joyce, Fall 2012 Some series converge, some diverge. Alternating Series and P-series "convergence" I couldn't resist trying out a pun. Overview of Ratio Test; 4 Examples; Root Test. Trust Ram Meter Inc. then the series is convergent. " ... | {
"domain": "emporiumgalorium.de",
"id": null,
"lm_label": "1. YES\n2. YES\n\n",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.97594644290792,
"lm_q1q2_score": 0.8563703479136634,
"lm_q2_score": 0.8774767858797979,
"openwebmath_perplexity": 830.88619511814,
"openwebmath_score": 0.7549763321876526,
"t... |
opencv, cv-bridge
Default:{...}
Decimal:{...}
Hex:{...}
Binary:{...}
Octal:{...}
When I try and run image viewer I get the error in the title what is going wrong? | {
"domain": "robotics.stackexchange",
"id": 8011,
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"tags": "opencv, cv-bridge",
"url": null
} |
if $\varphi : M \to N$ and $\psi : N \to M$ then $\text{Trace}(\varphi \circ \psi) = \text{Trace}(\psi \circ \varphi)$ and $\text{Det}(\varphi \circ \psi) = \text{Det}(\psi \circ \varphi)$. \item In case $M$ is finite locally free show that $\text{Trace}$ defines an $A$-linear map $\text{End}_A(M) \to A$ and $\text{Det... | {
"domain": "github.com",
"id": null,
"lm_label": "1. YES\n2. YES\n\n",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9854964220125032,
"lm_q1q2_score": 0.8080019446376565,
"lm_q2_score": 0.8198933315126792,
"openwebmath_perplexity": 120.73245969658541,
"openwebmath_score": 0.9982831478118896,
"tags"... |
c++, linked-list, template
Title: Separate Declaration and Definition of private Node implementation in template Linked List I was practicing implementing a template Linked List with a private node implementation. I know one of the methods to define template class member functions is to keep the declaration and defin... | {
"domain": "codereview.stackexchange",
"id": 26021,
"lm_label": null,
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"openwebmath_score": null,
"tags": "c++, linked-list, template",
"url": null
} |
python, r
Title: What's the best graphic in R to study air pollution? I have a Python dataframe (in addition to an excel file) with data on air pollution for countries, (one line every day between 2014 and 2020). I would like to see what's the polluant the most related to industrial production, fort that I want to com... | {
"domain": "datascience.stackexchange",
"id": 7633,
"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": "python, r",
"url": null
} |
To my mind, the most interesting thing here is the connection to r-norms. I’ll explore that more in the next post, applying r-norms to the surface area of an ellipsoid.
[1] Carl E. Linderholm and Arthur C. Segal. An Overlooked Series for the Elliptic Perimeter. Mathematics Magazine, June 1995, pp. 216-220
# Bessel de... | {
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"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9780517475646369,
"lm_q1q2_score": 0.801898107854701,
"lm_q2_score": 0.8198933337131077,
"openwebmath_perplexity": 821.6639504124951,
"openwebmath_score": 0.8268793821334839,
"tags": n... |
noise, power-spectral-density, sensor, white-noise
Title: Modelling MEMS accelerometer noise I am trying to compare two MEMS accelerometers in terms of their noise for ground motion monitoring applications. I would like to take some "clean" data (recorded by good quality instrumentation), add white noise to it so I ca... | {
"domain": "dsp.stackexchange",
"id": 12374,
"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": "noise, power-spectral-density, sensor, white-noise",
"url": null
} |
c#, recursion, linq
var gdata = new List<ProductLineDto>();
gdata.AddRange(ganttData);
for (var i = 0; i < gdata.Count; i++)
{
var pType = new List<ProjectTypeDto>();
pType.AddRange(gdata[i].ProjectType);
for (var j = 0; j < pType.Count; j++)
{
... | {
"domain": "codereview.stackexchange",
"id": 25039,
"lm_label": null,
"lm_name": null,
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"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "c#, recursion, linq",
"url": null
} |
botany, species-identification
Title: What is this plant in the Butler, Pennsylvania area? This is growing in the woods near my house in the Butler, Pennsylvania (USA) area. I have not seen it around before, and I have no idea what is it. What is it? Is it poisonous to pets (or little kids)? That looks like a bit like... | {
"domain": "biology.stackexchange",
"id": 11360,
"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": "botany, species-identification",
"url": null
} |
electromagnetism, quantum-field-theory, gauge-theory, commutator, gauge
Title: Quantization of a spin-1 field canonical commutator This is a question regarding the spin-1 massive field commutator $[A_i(\mathbf{x},t),\Pi_j(\mathbf{y},t)]$, where $\Pi$ is the conjugate field and $A^\mu$ is the four-potential. My result ... | {
"domain": "physics.stackexchange",
"id": 39976,
"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": "electromagnetism, quantum-field-theory, gauge-theory, commutator, gauge",
"url":... |
Write the simplified form of each expression. Radical Form to Exponential Form Worksheets Exponential Form to Radical Form Worksheets Adding Subtracting Multiplying Radicals Worksheets Dividing Radicals Worksheets Algebra 1 Algebra 2 Square Roots Radical Expressions Introduction Topics: Simplifying radical expressions ... | {
"domain": "scanjetviaggi.it",
"id": null,
"lm_label": "1. YES\n2. YES\n\n",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.975576912076157,
"lm_q1q2_score": 0.8108439660829655,
"lm_q2_score": 0.8311430457670241,
"openwebmath_perplexity": 1737.6890247971703,
"openwebmath_score": 0.7300655841827393,
"... |
java, beginner
PointsCalculation:
public class PointsCalculation {
public void getResults(int points) {
if (points < 4) {
System.out.println(
"\nScore: " + points + " out of 7." + "\nSorry, you didn't do so well! Thanks for playing.");
} else if (points < 6) {
... | {
"domain": "codereview.stackexchange",
"id": 23832,
"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": "java, beginner",
"url": null
} |
c, reinventing-the-wheel, memory-management, pointers, memory-optimization
Number of digits
Your method is naive, and therefore slow.
In general, division and modulo are the slowest arithmetic operations on a CPU. For x64, a 64-bits division is 30 to 90 cycles when an addition is 1 cycle and a multiplication 3 cycles.... | {
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"id": 41727,
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "c, reinventing-the-wheel, memory-management, pointers, memory-optimization",
... |
bioinformatics, proteins
Title: Protein PTM site prediction Is there any in silico analysis method to predict post-translational modification sites on a given protein? There are actually a lot of these sites available, I have used some of the one listed below. Additionally there are some huge list of other services a... | {
"domain": "biology.stackexchange",
"id": 3564,
"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": "bioinformatics, proteins",
"url": null
} |
ruby, beginner, windows
#Add the disks usage in %
def get_logical_disk_usage_percentage(logical_disk)
logical_disk.each do |disk|
disk.push(((disk[2].to_f/disk[3].to_f)*100).round(2))
disk.push(100.00-disk[5])
end
return logical_disk
end
def run
timestamp = Time.now.utc.to_i
logi... | {
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"openwebmath_score": null,
"tags": "ruby, beginner, windows",
"url": null
} |
{ 3 } = 3 Mathematics questions answers. The committee if there must be more women than men ideas about Mathematics! With some questions to the safe is 472 '' { 9 } { 4 } $.. Answer keys are possible to count many possible outcomes there are 4 pairs of adjacent numbers in! Types of permutation in Discrete Mathematics s... | {
"domain": "apanorthstar.org",
"id": null,
"lm_label": "1. YES\n2. YES\n\n",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.981735721648143,
"lm_q1q2_score": 0.8304919072573559,
"lm_q2_score": 0.8459424353665381,
"openwebmath_perplexity": 886.4381233016849,
"openwebmath_score": 0.6314994096755981,
"t... |
c#, sorting, winforms
panelI.Top = paintArea.Height - panelI.Height;
panelP.Top = paintArea.Height - panelP.Height;
}
void StepAlgorithm_SortStepPerformed(object sender, SortStepPerformedEventArgs e)
{
switch (e.StepPoint)
{
case PointOfStep.BeforeStep:
... | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "c#, sorting, winforms",
"url": null
} |
bash, linux, networking
Title: Bash script to change network interface parameters/configuration and start virtual machines On my Arch Linux system I have created a script that should do the following on system startup:
detect all network interfaces
check if physical interfaces are up
check if bridge interfaces are up... | {
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"id": 32281,
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"lm_q2_score": null,
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"openwebmath_score": null,
"tags": "bash, linux, networking",
"url": null
} |
computer-architecture, cpu-cache, virtual-memory
Therefore, the data cache acts as a dedicated cache for memory reads. The data cache has some cache entries, where each cache entry contains a physical address and the value of memory at that address.
The data cache lets the processor very quickly read from memory. Wh... | {
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"id": 2035,
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"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "computer-architecture, cpu-cache, virtual-memory",
"url": null
} |
hydrology, statistics
Title: How to check the recurrence intervall of heavy rain events Heavy rain or flood events have recurrence intervalls. I.e. 100 year, 50 year or 25 year events. However, with increasing data and global warming and other factors these intervalls change.
How can I check wether a heavy rain event... | {
"domain": "earthscience.stackexchange",
"id": 1916,
"lm_label": null,
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"openwebmath_score": null,
"tags": "hydrology, statistics",
"url": null
} |
placed with respect to the center cell is the same" (12, p. After eliminating weakly dominated strategies, we get the following matrix:. Example: Find the eigenvalues and eigenvectors of the real symmetric (special case of Hermitian) matrix below. For example, 2 = (𝑋 𝑥−1)(𝑋 𝑥−1) = (𝑋 2𝑥−1) (48) and so on for high... | {
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"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9910145699205375,
"lm_q1q2_score": 0.8610200024040231,
"lm_q2_score": 0.8688267847293731,
"openwebmath_perplexity": 464.864180982628,
"openwebmath_score": 0.7947157621383667,
"tags": null... |
tensorflow, programming
Title: Output of classifier.predict Tensorflow extract probabiltity When I do a prediction with my DNN clasifier I get a dictionary like this.
{'probabilities': array([9.9912649e-01, 8.7345875e-04, 8.5633601e-12], dtype=float32), 'logits': array([ 12.641698, 5.599522, -12.840958], dtype=floa... | {
"domain": "datascience.stackexchange",
"id": 4346,
"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": "tensorflow, programming",
"url": null
} |
logic, curry-howard
For example, in most languages, you can make a function that takes a natural number and returns an array of that size and it will have type $\operatorname{nat} \to \operatorname{nat} \operatorname{array}$. But if you want to specify it further and say that it doesn't return any array but really an ... | {
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"id": 21905,
"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": "logic, curry-howard",
"url": null
} |
atomic-physics, reflection, diffraction, braggs-law
Title: How is Bragg's Law related to the Phenomenon of Diffraction? As far as I understand, bragg reflections is a geometric result which says that parallel x ray beams that are incident on atomic planes will constructively interfere at specific angles. Where does di... | {
"domain": "physics.stackexchange",
"id": 56402,
"lm_label": null,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "atomic-physics, reflection, diffraction, braggs-law",
"url": null
} |
python, python-3.x, median
This shows that the generation of the random input takes longer than finding the median, and that 90% of Median() is spent sorting (probably most of the rest is caused by converting between lists and iterators). You're unlikely to get large gains through modifications to your own part of th... | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "python, python-3.x, median",
"url": null
} |
python, ros-kinetic, ubuntu, ubuntu-xenial
Title: Subscribing to a text file
hello everyone. I want to know if i could subscribe to a data stored in a text file.
My data is in the form
0.97542241 1.22256888
1.66565685 1.25254882
1.22222658 1.26589587
There is a tab space between each ... | {
"domain": "robotics.stackexchange",
"id": 33750,
"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": "python, ros-kinetic, ubuntu, ubuntu-xenial",
"url": null
} |
6. After you complete this assignment, again push your work up to github. Name your commit "completed assignment 1".
# Problem 1-2¶
Location: assignment-problems/is_symmetric.py
Note: This problem is worth 1 point for passing both tests, plus another 1 point for code quality (if you pass the tests). So, the rubric i... | {
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"lm_q1_score": 0.9496693674025231,
"lm_q1q2_score": 0.8483485785423569,
"lm_q2_score": 0.8933094060543487,
"openwebmath_perplexity": 3939.1719175841904,
"openwebmath_score": 0.29098623991012573,
"tags": n... |
Sorry if this question sounds kinda dumb but I'm still new to multivariable calculus and today is my first time dealing with MVC limits.
Thank you !
Others can add and/or correct, but I'm not sure if you can do the polar trick. If $x$ and $y$ tend to infinity, then clearly $r \to \infty$. But if you have $r \to \inft... | {
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"id": null,
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"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9715639694252315,
"lm_q1q2_score": 0.8508830922761204,
"lm_q2_score": 0.8757869981319862,
"openwebmath_perplexity": 133.60280344362724,
"openwebmath_score": 0.9482593536376953,
"ta... |
ros, roslibjs
Title: How to get error information using roslibjs
Using roslibjs and rosbridge--I'd like to get more information when there is an error, particularly when connecting.
My code is:
ros = new ROSLIB.Ros({
url: robotUrl
});
ros.on('error', function(error) {
console.log ('Error connecting to websocket serve... | {
"domain": "robotics.stackexchange",
"id": 21658,
"lm_label": null,
"lm_name": null,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "ros, roslibjs",
"url": null
} |
wavelet, statistics, random-process
Title: This is an expression for the computation of kurtosis.
However, I don't understand what the subscript '4x' or the parameter (0,0) stand for. Could anyone explain ? For a stationary process $x$, moments and cumulants, when they exist, depend on relative time lags, hence $n-1... | {
"domain": "dsp.stackexchange",
"id": 3405,
"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": "wavelet, statistics, random-process",
"url": null
} |
$$(a, b) + (c, d) = (a + c, b + d), \; a, b, c, d \in \Bbb R, \tag 1$$
are consistent with the field axioms. For example, we may immediately rule out component-wise multiplication,
$$(a, b)(c, d) = (ac, bd), \tag 2$$
the identity element of which is $$(1, 1)$$, because it has zero-divisors, e.g., assuming $$a \ne 0 ... | {
"domain": "stackexchange.com",
"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9843363494503271,
"lm_q1q2_score": 0.8386081109934642,
"lm_q2_score": 0.8519528019683105,
"openwebmath_perplexity": 159.00290261612562,
"openwebmath_score": 0.902271568775177,
"tag... |
geophysics, hydrology, geysers
Are the 65 minute and 91 minute values given for the eruption times simply a byproduct of needing more time for the steam to "recharge" after a larger eruption, or is there a deeper interplay between the underground cavity and the main channel that causes some sort of a vortex that has a... | {
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"id": 210,
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "geophysics, hydrology, geysers",
"url": null
} |
c#
grdMessage.EditIndex = -1;
mdsRedirect.WriteXml(st);
mdsRedirect.Dispose();
getxml();//read XML file and bind it
} Not sure if it's "optimized", but here's something of a simplification:
protected void grdMessage_RowUpdating(object sender, GridViewUpdateEventArgs e)
{
string messageIdStr... | {
"domain": "codereview.stackexchange",
"id": 924,
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "c#",
"url": null
} |
Products of orthogonal projection and reflection matrices
I am asking about a 3 part problem that I was marked for only 3/10 points.
Let the matrix $A$ represent the orthogonal projection onto the line $y=-\sqrt{3}x$, and let matrix $B$ represent reflection over the line $y=-\sqrt{3}x$.
$A^{1001}$
$B^{1001}$
and $... | {
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"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9591542805873231,
"lm_q1q2_score": 0.8298833841376799,
"lm_q2_score": 0.865224084314688,
"openwebmath_perplexity": 243.97951674619108,
"openwebmath_score": 0.8529571294784546,
"tag... |
nuclear-physics, radiation
Title: Determining energy of gamma-rays after alpha-decay of Am-241 So it turns into Np, and electrons just falling into 'free new' levels and emmiting, right?
Give me a link where to read, please, if it's very easy to answer. This is a complicated decay with many possible modes--there are ... | {
"domain": "physics.stackexchange",
"id": 9123,
"lm_label": null,
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"openwebmath_score": null,
"tags": "nuclear-physics, radiation",
"url": null
} |
the source of S) and S T is the identity map (on the source of T). It does have an inverse exactly when its determinant is nonzero. 2 x 2 invertible matrix. Find the matrix of r with respect to the standard basis. In this way, we can represent the point by 3 numbers instead of 2 numbers, which is called Homogenous Coor... | {
"domain": "shopnetplus.it",
"id": null,
"lm_label": "1. YES\n2. YES\n\n",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.986571747626947,
"lm_q1q2_score": 0.801951925875367,
"lm_q2_score": 0.8128673133042217,
"openwebmath_perplexity": 351.95506445665274,
"openwebmath_score": 0.8326934576034546,
"tag... |
javascript, jquery, event-handling
<div class="form-group">
<label>End IP Address</label>
<input type="text" class="form-control" id="txtendIpAddr" disabled=true>
</div> Overall your code is readable and it is clear to me what you are trying to accomplish by reading the code alone. Your variable names describe the... | {
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"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "javascript, jquery, event-handling",
"url": null
} |
homework-and-exercises, electromagnetism, differentiation, approximations
$$\psi(\vec{r})\to\psi(x,y,z)=e^{i(xk_x+yk_y+zk_z)}$$
Of course, these may not be (and in fact probably aren't) the easiest coordinate systems to use for performing these Taylor expansions, but the same idea applies - pick a coordinate system an... | {
"domain": "physics.stackexchange",
"id": 52689,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "homework-and-exercises, electromagnetism, differentiation, approximations",
"url... |
astronomy, telescopes, stars
Title: Are our telescopes capable of taking actual images of brown dwarfs? One nice result from NASA's WISE infrared survey of the sky is the discovery of particularly cool (as in 'not very warm') stars, now called 'Y dwarfs'. This was reported, for example, in
NASA's WISE mission discov... | {
"domain": "physics.stackexchange",
"id": 11610,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "astronomy, telescopes, stars",
"url": null
} |
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