text stringlengths 49 10.4k | source dict |
|---|---|
c++, image, template, c++20, constrained-templates
template<class InputT>
constexpr static auto divides(const std::vector<Image<InputT>>& input1, const std::vector<Image<InputT>>& input2)
{
assert(input1.size() == input2.size());
return recursive_transform<1>(
[](auto&& input1_eleme... | {
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"tags": "c++, image, template, c++20, constrained-templates",
"url": null
} |
ros, opencv, cuda, cmake
Title: add local opencv to path
I want to compile my ROS node with the opencv which is at /usr/local/ I have tried the following rosanswers
I could compile my code without errors. But when i run the node, i get the following error.
undefined reference to `cv::cuda::createStereoBM(int, int)'
... | {
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"tags": "ros, opencv, cuda, cmake",
"url": null
} |
c#, multithreading, thread-safety
if (!NextOption.ContainsKey(key.GetHashCode()))
{
lock (NextOption)
{
if (!NextOption.ContainsKey(key.GetHashCode()))
{
NextOption.Add(key.GetHashCode(), url);
... | {
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"openwebmath_score": null,
"tags": "c#, multithreading, thread-safety",
"url": null
} |
php, rest, curl, phpunit
/**
* Method to provide common validation for data parameters
*
* @param mixed $data
* @return void
* @throws \InvalidArgumentException
*/
protected function validateData($data) {
if(empty($data)) {
throw new \InvalidArgumentException('An ... | {
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"tags": "php, rest, curl, phpunit",
"url": null
} |
forces, quantum-spin
Title: Coulomb Repulsion and Spin
Because of the coulomb interaction the energy of electrons of the same
spin is lower - the average potential energy is less positive for
parallel spin than for antiparallel spin.
This is quoted from Kittel, Ch 11, under Hund Rules.
I can't understand how Coulomb... | {
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"openwebmath_score": null,
"tags": "forces, quantum-spin",
"url": null
} |
polymers, plastics
Title: Degrading Bakelite I'm aware of the fact that Bakelite is a thermosetting polymer, and is infusible. But what happens if you keep on heating a Bakelite piece to ridiculously high temperatures. I'm pretty sure it would break apart at very high temperatures.
Aside from high temperatures, is it ... | {
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"openwebmath_score": null,
"tags": "polymers, plastics",
"url": null
} |
kinematics, dimensional-analysis
$$\sqrt{x\times[Z_1]^2} = \sqrt x \times [Z_1]$$
and so forth. And, of course, we defined the concept of unit multiplication and division that we are now used to. We defined "dimensionality" to capture whether it was meaningful to add treat units as different "spellings" of the same ... | {
"domain": "physics.stackexchange",
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"openwebmath_score": null,
"tags": "kinematics, dimensional-analysis",
"url": null
} |
complexity-theory, algorithm-analysis, asymptotics, recurrence-relation
A similar situation is that of partial limits and limits superior and inferior. Consider the sequence $\sin n$ (where the angle is measure in radians). For each $x \in [-1,1]$, we can find an infinite sequence $n_k$ such that $\sin n_k \to x$. The... | {
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"tags": "complexity-theory, algorithm-analysis, asymptotics, recurrence-relation",
"url": null... |
thermodynamics, electrolysis, metallurgy
Title: Good choice for heat-conductive coil submerged in sea water I know only as much about chemistry as I can remember from a year in college. So, please speak slowly and use short words.
I'm trying to decide on an appropriate material for a heat-transfer coil that is meant ... | {
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"tags": "thermodynamics, electrolysis, metallurgy",
"url": null
} |
c++, algorithm, matrix, c++20
} Avoid restricting template types too much
You are restricting the value type of the matrix to artithmetic types and complex numbers. But what if I had a custom type that implemented fractions, or had some other type for which matrix multiplication would make sense? If you cannot predict... | {
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"tags": "c++, algorithm, matrix, c++20",
"url": null
} |
reinforcement-learning, deep-rl, rewards, function-approximation, sutton-barto
My question is: why does the update rule for the average rate of reward estimate consider TD error, and why are we not updating it simply as $\bar{R}_{t + 1} = (1 - \beta) \bar{R}_t + \beta R_{t+1}$ ? Mystery solved thanks to Exercise 10.8 ... | {
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"tags": "reinforcement-learning, deep-rl, rewards, function-approximation, sutton-barto",
"url"... |
c, weekend-challenge, sudoku
int main()
{
int i, j;
int puzzle[9][9]={{0, 0, 0, 0, 0, 0, 0, 9, 0},
{1, 9, 0, 4, 7, 0, 6, 0, 8},
{0, 5, 2, 8, 1, 9, 4, 0, 7},
{2, 0, 0, 0, 4, 8, 0, 0, 0},
{0, 0, 9, 0, 0, 0, 5, 0, 0},
... | {
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"openwebmath_score": null,
"tags": "c, weekend-challenge, sudoku",
"url": null
} |
mechanical-engineering, automotive-engineering, gears, engines
Title: Why are bulldozers so slow? Tracked-type tractors and bulldozers are very slow engineering vehicles. Their top speed is less than 15 km/h and when pushing it is even lower (< 5 km/h). For example: the Caterpillar D9's top speed in forward gear is 11... | {
"domain": "engineering.stackexchange",
"id": 5131,
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "mechanical-engineering, automotive-engineering, gears, engines",
"url": null
... |
frequency-spectrum, sampling, dft, spectrogram
This means the actual equation should be:
$$ x \left( t \right) = \frac{1}{N} \sum_{k = \left \lfloor - \frac{N}{2} \right \rfloor }^{ \left \lfloor \frac{N - 1}{2} \right \rfloor } X \left[ k \right] {e}^{ j 2 \pi k \frac{t}{T} } $$ | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "frequency-spectrum, sampling, dft, spectrogram",
"url": null
} |
complexity-theory
Title: Clarification of definition of class $DisNP$ I an trying to learn about $DisNP$ Complexity class. I couldn't find this class in any book. But, regarding it, I found this definition in a paper:
Definition: A disjoint NP-pair (NP-pair for short) is a pair of nonempty sets $A$ and $B$ such that $... | {
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"openwebmath_score": null,
"tags": "complexity-theory",
"url": null
} |
c++, sorting, reinventing-the-wheel, mergesort, c++20
Title: Trying for an efficient and readable merge-sort implementation My first implementation of merge sort in C++.
I'm looking for any sort of optimization and/or conventional practice tips, such as using the appropriate data types and naming my variables appropri... | {
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"tags": "c++, sorting, reinventing-the-wheel, mergesort, c++20",
"url": null
} |
catkin, boost, cmake
Originally posted by ahendrix with karma: 47576 on 2014-12-01
This answer was ACCEPTED on the original site
Post score: 1
Original comments
Comment by lucascoelho on 2014-12-01:
I missed the "using namespace boost;" line, exactly what you said! Thanks a lot! | {
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\\ & =\ln \left( u+1 \right)+\frac{1}{2}\ln \left( {{u}^{2}}-u+1 \right)+3\frac{1}{\sqrt{3}}ta{{n}^{-1}}\left( \frac{2u-1}{\sqrt{3}} \right) \\ \end{align} | {
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"openwebmath_score": 0.9999364614486694,
"tags... |
filters, downsampling
figure, plot(linspace(-1,1,1024), abs(fftshift(fft(h,1024))));
hold on
plot(linspace(-1,1,1024), abs(fftshift(fft(h2,1024))),'r');
title('DTFT magnitudes for h[n] and h2[n] = h[2n]');
legend('h[n]','h[2n]')
The resulting plot is: | {
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} |
row and the second row (. We can find its transpose by swapping the column and row elements as follows achieves no change overall before on. To another, or to exchange the positions of two things… non-square matrix ; Multiply element... Solve It on “ PRACTICE ” first, before moving on to the solution words if A= [ aij,... | {
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"lm_q1_score": 0.982287697666963,
"lm_q1q2_score": 0.8289477850737355,
"lm_q2_score": 0.8438951104066293,
"openwebmath_perplexity": 746.62868446024,
"openwebmath_score": 0.7288891673088074,
"tags... |
quantum-mechanics, hilbert-space, linear-algebra, eigenvalue, software
$$
The last free parameter $x_{a=\sqrt 2}$ is fixed by the normalization condition
$$
\left( \begin{matrix} x \\ y \end{matrix} \right)_{a=\sqrt 2} \cdot \left( \begin{matrix}x \\ y \end{matrix} \right)_{a=\sqrt 2} = 1
$$
where i have omitted comp... | {
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"url": ... |
If you're seeing this message, it means we're having trouble loading external resources on our website.
If you're behind a web filter, please make sure that the domains *.kastatic.org and *.kasandbox.org are unblocked.
# Scatterplots | Lesson
## What's a scatterplot?
A scatterplot displays data about two variables ... | {
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"openwebmath_score": 0.32533368468284607,
"tags"... |
at a distance L/2 is thought of as average! Or rectangular tube composite BODIES What is center of MASS of the polygonal composite figures Illustrated:! The objective of this video is to consider centroid of the shaded region parallel axis Theorem composite section centroidal.... Is passing through centroid, it passes ... | {
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"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9895109105959843,
"lm_q1q2_score": 0.8019777206723575,
"lm_q2_score": 0.8104789063814616,
"openwebmath_perplexity": 967.1269150955148,
"openwebmath_score": 0.5556424260139465,
"t... |
php, object-oriented, repository
public function insert($input)
{
$name = $input['name'];
$email = $input['email'];
$username = $input['username'];
$password = md5($input['password']);
$query = "insert into user (name, email, username, password) values ('$name', '$email', '... | {
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"openwebmath_score": null,
"tags": "php, object-oriented, repository",
"url": null
} |
planet
a Cen A b: 3.6/10 life, 5.6/10 cool-factor. Unconfirmed, probably too small for a habitable moon even at its highest mass estimate; really close to the inner HZ too.
HD 180617 A b: 3/10 life, 3/10 cool-factor. May be too small for a decent moon, and very cold. Only works with the most generous Hill ratio.
Trapp... | {
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"tags": "planet",
"url": null
} |
ros, arduino, publisher
Order_listener code:
#include "ros/ros.h"
#include "std_msgs/Bool.h"
void orderCallback(const std_msgs::Bool::ConstPtr& msg)
{
ROS_INFO("%d", msg->data);
}
int main(int argc, char **argv)
{
ros::init(argc, argv, "order_listener");
ros::NodeHandle n;
ros::Subscriber sub = n.subscribe("... | {
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"tags": "ros, arduino, publisher",
"url": null
} |
scikit-learn, keras, feature-scaling
dataX = self.x_scaler.fit_transform(dataX)
dataY = self.y_scaler.fit_transform(dataY)
self.model.fit(dataX, dataY, nb_epoch=1000)
data = numpy.array([[val1, val2, val3]])
data = self.x_scaler.transform(data)
prediction = self.model.predict(data)
real_prediction = self.y_scaler.in... | {
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"openwebmath_score": null,
"tags": "scikit-learn, keras, feature-scaling",
"url": null
} |
quantum-mechanics, wavefunction, schroedinger-equation, perturbation-theory, calculus
Title: Power series of quantum mechanical eigenfunctions In Griffith's Quantum Mechanics book, when he tackles time-independent perturbation theory, he states that one can write the eigenfunctions of the perturbed system,
$$
H = H^0 ... | {
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"tags": "quantum-mechanics, wavefunction, schroedinger-equation, perturbation-theory, calcu... |
security, vb.net, ms-access
Title: Security issues in a SQL query and possible function?
By adding more and more features to my websites, I am now up to 7 different hard coded queries.
I have read a lot about SQL injections and possible flaws and security issues, and wanted to make sure that it was secure enough.
Thi... | {
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"tags": "security, vb.net, ms-access",
"url": null
} |
Why are you testing reflexivity by looking at two different elements of $$\mathcal{X}$$? The definition of reflexivity says that a relation is reflexive iff each element of $$\mathcal X$$ is in relation with itself.
To check whether $$\mathcal R$$ is reflexive, just take one element of $$\mathcal X$$, let's call it $$x... | {
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"lm_q2_score": 0.8705972600147106,
"openwebmath_perplexity": 86.55734743884899,
"openwebmath_score": 0.8572835922241211,
"tag... |
general-relativity, black-holes, astrophysics, redshift, quasars
The relativistic doppler shift for a source moving at a speed $v$ at an angle $\theta$ (in the reference frame of the observer), then the emitted and observed frequencies are related by
$$ f_o = \frac{f_e}{\gamma\left[ 1 + (v/c)\cos\theta\right]},$$
whe... | {
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"tags": "general-relativity, black-holes, astrophysics, redshift, quasars",
"url": null
} |
matlab, finite-impulse-response, kernel
Title: Optimize FIR filter kernel in Matlab I am currently using the firls function in Matlab to create my FIR filter kernel. This works well but I typically have to play with the filter order to get the gain to 1 and the shape to be somewhat Gaussian in the frequency domain.
I ... | {
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"tags": "matlab, finite-impulse-response, kernel",
"url": null
} |
rviz
Title: Dose the rviz View-Oriented Text support UTF-8 caption?
Hi,
I'd like to display some text markers with Chinese characters in rviz.
So I tried:
marker.text = text.encode('UTF-8')
and the marker.text therefor in the u'\u5b57\u8282' form.
But nothing pop out.
Any suggestion to make it work?
Thanks!
Origin... | {
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} |
special-relativity, mass, speed-of-light, speed
Title: What is the fastest speed that a massive object can travel at? What is the fastest speed (in miles per hour) that a massive object can travel at? I have heard that an object can travel at the speed of light, but I've also heard that massive objects cannot travel a... | {
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"tags": "special-relativity, mass, speed-of-light, speed",
"url": null
} |
python, python-3.x, tic-tac-toe
Functionality
It's conventional for a method to either change state and return None, or to return something but not change state - win returns something and changes state (although the return value is ignored anyway).
Rather than showBoard, I would be inclined to implement a __str__ me... | {
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Next, note that $$\sum_{0\le i<k}|P_i|=\sum_{0\le i<k}\binom{i+2}2=\binom{k+2}3\;.$$ Thus, in the ordering of $\Bbb N^3$ as a whole, $\langle 0,0,k\rangle$ has $\binom{k+2}3$ predecessors. Combining results, we see that $\langle x,y,z\rangle$ has $$\binom{x+y+z+2}3+\binom{x+y+1}2+x$$ predecessors in this ordering of $\... | {
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"lm_q1_score": 0.9799765557865637,
"lm_q1q2_score": 0.8229196053469375,
"lm_q2_score": 0.8397339716830605,
"openwebmath_perplexity": 170.8777419436295,
"openwebmath_score": 0.9053110480308533,
"tag... |
# Does Cayley Hamilton Theorem apply for non-diagonalizable matrices as well?
Cayley Hamilton Theorem says that a matrix $$A$$ satisfies its characteristic equation. My professor proved this for diagonalizable matrices. What happens if $$A$$ is not diagonalizable? Does the C-H Theorem still hold? Can you give a proof ... | {
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"lm_q2_score": 0.8376199633332891,
"openwebmath_perplexity": 372.70245259938906,
"openwebmath_score": 0.8807723522186279,
"ta... |
optics, visible-light, everyday-life, distance
Title: Why does one get an illusion as moon following him? When you run or ride bike at night if you observe the moon you feel like he moves along with you as the same speed you are going. Why? Suppose you're walking past a nearby tree:
As you pass the tree the angle of ... | {
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"tags": "optics, visible-light, everyday-life, distance",
"url": null
} |
which builds the distance graph adjacency matrix, and is equivalent to the more readable
Table[Norm[p1-p2],{p1,Points},{p2,Points}]
• DistanceMatrix would be much faster (but still of $O(n^2)$ complexity). The purpose of using a Delaunay triangulation as the base graph was to avoid the $O(n^2)$ complexity. – Szabolcs... | {
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"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9334308165850443,
"lm_q1q2_score": 0.8142759315850592,
"lm_q2_score": 0.8723473846343394,
"openwebmath_perplexity": 1521.4639742658176,
"openwebmath_score": 0.4133446514606476,
"ta... |
c++, c++11, multithreading
// A callback function that is called when both scanning tasks are completed or stopped.
virtual void scanFinished(bool success, const std::string& errorMessage) = 0;
private:
void freeThreadsResources();
void scanLocalWrapper(const std::wstring& localDir);
void scanSharedWr... | {
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"tags": "c++, c++11, multithreading",
"url": null
} |
GMAT Question of the Day - Daily to your Mailbox; hard ones only
It is currently 19 May 2019, 10:02
### GMAT Club Daily Prep
#### Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.
Customize... | {
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"id": null,
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"openwebmath_perplexity": 6044.133223168102,
"openwebmath_score": 0.7333633899688721,
"tags": null,
"url": "ht... |
general-relativity
Title: Correct my understanding of the logical flow of the formulation of General Relativity Correct and direct me when I am wrong.
That is how I understand the logical flow of the formulation of the general theory of relativity:
First we have the equivalence principle, that one tells us that if wan... | {
"domain": "physics.stackexchange",
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"openwebmath_score": null,
"tags": "general-relativity",
"url": null
} |
c++, sudoku
void solve(subSquare grid[9][9]){
printf("Before solving: \n");
readGrid(grid);
phase1(grid);
phase2(grid);
if(gridUnsolved(grid)){
phase3(grid);
}
if(!gridUnsolved(grid)){
printf("After solving:\n");
readGrid(grid);
}else{
printf("ERROR: Impo... | {
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"openwebmath_score": null,
"tags": "c++, sudoku",
"url": null
} |
programming-languages
Title: What makes a language "optimized" for a specific task? Often there are programming languages that are specialized for specific tasks. Some programming languages are excellent at array arithmetic (such as matrices and the use of multidimensional arrays), yet some are much better at higher-l... | {
"domain": "cs.stackexchange",
"id": 7751,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "programming-languages",
"url": null
} |
error-correction, no-cloning-theorem
Title: Cloning for error correction by preparing state multiple times In quantum error correction, we start with the fact that no-cloning theorem doesn't allow cloning of unknown states, hence we need to come up with other strategies.
But often we know the circuit that produces the... | {
"domain": "quantumcomputing.stackexchange",
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"tags": "error-correction, no-cloning-theorem",
"url": null
} |
algorithms, data-structures, trees, discrete-mathematics
The text you quote is less sophisticated. It is bounding the number of leaves at distance at most $d$ from the root by the number of nodes at distance at most $d$ from the root. Since there are at most $2^e$ nodes at distance exactly $e$ from the root, it follow... | {
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"tags": "algorithms, data-structures, trees, discrete-mathematics",
"url": null
} |
(a) Write a differential equation for Wronskian of $y_1,y_2,y_3$, which are solutions for homogeneous equation and solve it.
(b) Find fundamental system $\{y_1,y_2,y_3\}$ of solutions for homogeneous equation, and find their Wronskian. Compare with (a).
(c) Find the general solution of (\ref{2-1}).
7
##### Term Test... | {
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"openwebmath_perplexity": 2054.453891909338,
"openwebmath_score": 0.7448478937149048,
"tags": nu... |
inorganic-chemistry, alloy
Title: If alloys are homogeneous mixtures, why can't we separate their components? An alloy is a material composed of two or more metals or a metal and a nonmetal. And, they are usually formed by heating the elements to their melting points, and then cooling them, so that the components mix.... | {
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"tags": "inorganic-chemistry, alloy",
"url": null
} |
rviz, ros-kinetic
[ERROR] [1549745353.053836019, 94.978000000]: Could not load model 'package://evarobot_description/meshes/caster_base.stl' for link 'front_caster_base_link': OGRE EXCEPTION(6:FileNotFoundException): Cannot locate resource package://evarobot_description/meshes/caster_base.stl in resource group Autodet... | {
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"id": 32441,
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"openwebmath_score": null,
"tags": "rviz, ros-kinetic",
"url": null
} |
r, seurat, rstudio
Title: ScaleData() from Seurat causes crash on RStudio Cloud Using the sample data in the 2,700 PBMC clustering tutorial, the session crashes at the ScaleData() step. The progress bar remains at 0% and hangs, followed by an R crash. I've tried reducing the size for number of genes to scale at in a s... | {
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"id": 778,
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"openwebmath_score": null,
"tags": "r, seurat, rstudio",
"url": null
} |
swift, playing-cards
Type Choices
Creating a card based on an integer isn't very intuitive. An alternative choice, as you've mentioned, would be using enums. Such an approach avoids the possibility of creating an invalid Card :
enum Suit: Character {
case spades = "♠", hearts = "♡", diamonds = "♢", clubs = "♣"
}
... | {
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In each case, the denominator is 2, so we can factor out a half.
The series eventually becomes $\frac{1}{2}\sum^{2499}_{k=0}[\sqrt{4k+3} - \sqrt{4k+1}]$.
Does this look nicer? Good luck.
-AB
Any additional steps? I seem stucked.
6. ## Re: Show that the sum of the series is greater than 24
I've been racking my head... | {
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"openwebmath_score": 0.94483482837677,
"tags... |
qiskit, quantum-gate, quantum-state, programming, unitarity
As can be seen in the table above, the state vectors of U and P swap with each other when the initial vectors are |00> and |10>. However, I have realized that this is related to swapping the 1st and 3rd columns of U to create P, but I am not currently able to... | {
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"openwebmath_score": null,
"tags": "qiskit, quantum-gate, quantum-state, programming, unitarity",
"url": nul... |
c++, object-oriented
Address_book.h
#ifndef ADDRESS_BOOK
#define ADDRESS_BOOK
#pragma once
#include "Person.h"
class Address_book
{
friend std::istream& operator>>(std::istream&, Address_book&);
friend std::ostream& operator<<(std::ostream&, Address_book&);
public:
//set vector size to match appropriate ... | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "c++, object-oriented",
"url": null
} |
humidity, water-vapour
Title: Water vapor content versus specific humidity I am wondering the difference between water vapor content and specific humidity to determine the moisture availability in the atmosphere. Which one is more acceptable variable to determine the moisture availability in the atmosphere?
I need to ... | {
"domain": "earthscience.stackexchange",
"id": 1504,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "humidity, water-vapour",
"url": null
} |
crystal-structure
Title: Why shape of diamond is like diamond? I know that in diamond carbon atoms occur in 3d geometry but i want to ask that why it is in shape of diamond not like some other 3d geometrical shape like cube or cuboid? Diamond has the shape of diamond for precisely the same reason why any other crysta... | {
"domain": "chemistry.stackexchange",
"id": 9077,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "crystal-structure",
"url": null
} |
ros, answers.ros.org
Title: how do I revise my original question
My question went out when only 10% complete. I don't know why.
The page says I can revise it, but it does not say how.
Originally posted by joq on ROS Answers with karma: 25443 on 2011-02-15
Post score: 1
I see a little "edit" link just below the tags... | {
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"tags": "ros, answers.ros.org",
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} |
# What are examples of variables that follow a binomial probability distribution
What are examples of variables that follow a binomial probability distribution probability distribution definition with example: the total set of all the probabilities of a random variable to attain all the possible values. Give some real... | {
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"lm_q2_score": 0.8244619177503206,
"openwebmath_perplexity": 209.56731435058538,
"openwebmath_score": 0.8872148990631104,
"ta... |
python, scikit-learn, sampling
>>> Y = np.array(df['completed_trip_status'].values.tolist())
>>> X
array([[[ 1, 1, 2, 3, 1, 1, 1, 1, 1, 3, 1,
3, 1, 1, 1, 1, 2, 1, 3, 1, 3, 3,
2, 3, 3, 1, 1, 1, 1],
[ 0, ... | {
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "python, scikit-learn, sampling",
"url": null
} |
cc.complexity-theory, np-hardness, approximation-algorithms, packing
Title: bin packing with overlapping objects I have $N$ bins with capacity $M$ and $k$ objects with size $s_i$. The goal is to pack these objects in the bins. Until now it is similar to the bin-packing problem. But the twist is that each object has a ... | {
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"tags": "cc.complexity-theory, np-hardness, approximation-algorithms, packing",
"url": nu... |
II - Exponents and Exponential Expressions Review: Tutoring Solution, Algebra II - Systems of Linear Equations: Tutoring Solution, California Sexual Harassment Refresher Course: Supervisors, California Sexual Harassment Refresher Course: Employees. To define the height is 8 cm, but the height, perimeter and area two. T... | {
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"id": null,
"lm_label": "1. Yes\n2. Yes\n\n",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9787126531738087,
"lm_q1q2_score": 0.8667787235660888,
"lm_q2_score": 0.8856314677809303,
"openwebmath_perplexity": 1772.1875258555697,
"openwebmath_score": 0.33080369234085083,
"... |
html, css, html5
17:37:25.462 SyntaxError: mistyped ; after conditional? full.en.js:1:30118
17:37:25.462 TypeError: variable e redeclares argument full.en.js:3:8639
17:37:25.463 TypeError: variable e redeclares argument full.en.js:3:21906
17:37:25.464 ReferenceError: reference to undefined property a[A][o] stub.en.js:... | {
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"tags": "html, css, html5",
"url": null
} |
ros, catkin, catkin-package
Title: export gcc flags though catkin? CFG_EXTRAS?
I have the gcc c++0x flag set for a few of my packages. All the packages that depend on these package also needs the c++0x flag if they must not throw warning when the header files are processed.
Is there a way for catkin to export the fla... | {
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"tags": "ros, catkin, catkin-package",
"url": null
} |
It may be that someone coming along later may not accept our informal arguments but may like our axioms for different reasons. This person will then be able to see the assumptions clearly and quickly and accept the proofs from them as valid and useful.
In the case of the reals, and our thought experiments on them, we ... | {
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"lm_q2_score": 0.8128673246376009,
"openwebmath_perplexity": 220.41505821084087,
"openwebmath_score": 0.8564059734344482,
"tags": null,
... |
inorganic-chemistry, redox, mole
Regarding the above question, how would one solve it?
Would it be valid to simply say that I know that 6 electrons are being transferred because we have this skeleton equation (balanced for charge):
$$\ce{Al -> Al(OH2)6^3+ + 6 e-}$$
And given that 6 electrons are being transferred an... | {
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"tags": "inorganic-chemistry, redox, mole",
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} |
Set $\displaystyle a=1,b=-1$ in the above identity
I think the easiest way to prove it is to think of a finite set of $$n$$ elements,
If you think of it that way, it's the number of even sized ($$(-1)^k = 1$$) subsets of $$\{1,\,\dotsc,\,n\}$$ minus the number of odd-sized ($$(-1)^k = -1$$) subsets.
The map
$$\varp... | {
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"lm_q2_score": 0.863391602943619,
"openwebmath_perplexity": 155.7491201492834,
"openwebmath_score": 0.9542222619056702,
"tags... |
electromagnetism, string-theory, tensor-calculus, notation
Title: Help with strange notation involving fractions of tensors I'm currently reading the paper Open strings in background gauge fields by Callan et.al. It is frequently used a notation that is not explained anywhere. If $F_{\mu\nu}$ is the electromagnetic f... | {
"domain": "physics.stackexchange",
"id": 98422,
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"tags": "electromagnetism, string-theory, tensor-calculus, notation",
"url": null
} |
machine-learning, tensorflow
Title: The cross-entropy error function in neural networks In the MNIST For ML Beginners they define cross-entropy as
$$H_{y'} (y) := - \sum_{i} y_{i}' \log (y_i)$$
$y_i$ is the predicted probability value for class $i$ and $y_i'$ is the true probability for that class.
Question 1
Isn't it... | {
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"tags": "machine-learning, tensorflow",
"url": null
} |
ros, ros-lunar, audio-common
So I'm tempted to modify the CMAKE file to reference one of these other programs.
QUESTION:
Are any of you familiar enough with the audio_common node to suggest which of the three programs should get referenced, or does it even matter? I'm willing to experiment but don't want to jackup my... | {
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"tags": "ros, ros-lunar, audio-common",
"url": null
} |
newtonian-mechanics, astrophysics, angular-momentum, conservation-laws
Title: Pulsars with accreting disk in binary system Following this line, I am wondering about the following question.
Accreting pulsars in binary systems are usually thought to accrete from a prograde disk, so increasing their spin in the process.
... | {
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"id": 14010,
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"tags": "newtonian-mechanics, astrophysics, angular-momentum, conservation-laws",
"url": ... |
special-relativity
Title: Help understanding Rindler's lighthouse Context
I am studying special relativity using [1]. In [1], Gray writes that,
The Minkowski diagram can help us see what is going on in a given special relativity problem: if we plot the relevant events on the diagram, we can see their relationship mor... | {
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"tags": "special-relativity",
"url": null
} |
newtonian-mechanics, harmonic-oscillator, spring, coupled-oscillators, normal-modes
They are easy to find
You can afterwards decompose any motion into a sum of normal modes. This comes from writing your equations of motion in the normal basis*.
So first you work out the normal modes by assuming a solution like the on... | {
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"id": 27672,
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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": "newtonian-mechanics, harmonic-oscillator, spring, coupled-oscillators, normal-mode... |
wpf, rubberduck, xaml
And:
<controls:GroupingGrid Grid.Row="1" x:Name="ResultsByInspectionTypeGrid"
ShowGroupingItemCount="True"
SelectedItem="{Binding SelectedItem}"
ItemsSource="{Binding Source={StaticResource ResultsByInspectionType}}"
... | {
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "wpf, rubberduck, xaml",
"url": null
} |
thermodynamics
Title: specific enthalpy change during phase change consider 1 kg of water in a sealed cylinder and piston, whic exert 1 atm pressure on the system. Also water is saturated liquid at T=100$^\circ$ C. Then we give the system heat, so part of the system change to saturate vapor, if we assume the process r... | {
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"lm_q2_score": null,
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"openwebmath_score": null,
"tags": "thermodynamics",
"url": null
} |
quantum-mechanics, homework-and-exercises, heisenberg-uncertainty-principle
Note now, that the post you were quoting was wrong in the sense we do not take the square of the expectation value, but the square of the absolute value of the expectation value.
But since $\langle AB-BA\rangle=\langle[A,B]\rangle=\langle iC\r... | {
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"openwebmath_score": null,
"tags": "quantum-mechanics, homework-and-exercises, heisenberg-uncertainty-principle",
"u... |
java, beginner, calculator
Title: Basic GUI calculator I know there's loads of these out there but I thought I'd give it a shot. My mate made a calculator but he used a GUI Builder and I personally prefer typing my GUI's by hand.
I've finished my first year of university (moving on to my second year) and I'm studying ... | {
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"openwebmath_score": null,
"tags": "java, beginner, calculator",
"url": null
} |
planet, solar-system, rotation
They define a planet's north pole as the one pointing north of the solar system's invariable plane.
This means that W decreases with time for Venus and Uranus.
Their figure 1 appears to indicate Q's RA as 90° - α0, in conflict with the text. I believe the text is correct.
When you are re... | {
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"id": 3786,
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"openwebmath_score": null,
"tags": "planet, solar-system, rotation",
"url": null
} |
velodyne
Title: how to save Vlp-16 results
Hi everyone I am new in Ros and Lidar.
My project is finding humans in VLP-16 lidar output.
To do that, I have a camera and vlp-16. I need to save images from camera and data from VLP-16. Then I will label corresponding pixels and train them with a ML algorithm.
I am saving ... | {
"domain": "robotics.stackexchange",
"id": 27512,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
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"openwebmath_score": null,
"tags": "velodyne",
"url": null
} |
continuous at x = a. In figure B \lim _{x\to a^{+}} \frac {f(x)-f(a)}{x-a}\ne \lim _{x\to a^{-}} \frac {f(x)-f(a)}{x-a}. x or in other words f' (x) represents slope of the tangent drawn a… Can we say that if a function is continuous at a point P, it is also di erentiable at P? Connection between continuity and differen... | {
"domain": "oscarfalk.com",
"id": null,
"lm_label": "1. YES\n2. YES\n\n",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9820137874059599,
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"lm_q2_score": 0.8577681122619883,
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"openwebmath_score": 0.9041855335235596,
"tag... |
c, game, file-structure
const uint32_t pmf_max_major = 1;
const uint32_t pmf_max_minor = 0;
const unsigned char pmf_eof_id[4] = {0x00, 0x00, 0xFF, 0xF1};
const unsigned char pmf_vertex_id[4] = {0x00, 0x00, 0xFF, 0xF2};
const unsigned char pmf_texture_coordinate_id[4] = {0x00, 0x00, 0xFF, 0xF3};
const unsigned char pm... | {
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"tags": "c, game, file-structure",
"url": null
} |
ros, roslaunch, universal-robot, rosparam
Comment by gvdhoorn on 2014-10-22:
You need to change the jointnames because by default (as you found), industrial_robot_client (IRC) uses joint_1, joint_2, etc. That needs to match the names in the goal that you send to the joint_trajectory_action node. Either update test_mov... | {
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"tags": "ros, roslaunch, universal-robot, rosparam",
"url": null
} |
machine-learning, network-topology
Title: Analyzing network architecture with TDA I'm doing Neural Architecture Search (NAS) by varying the number of layers and neurons per layer for a neural network (connections are feed-forward throughout), and then training it on a fixed task to test its performance. The end goal i... | {
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"id": 21308,
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"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "machine-learning, network-topology",
"url": null
} |
formal-languages, reference-request
An overview of the literature in that area is given by Sakarovich, in his paper "The "last" decision problem for rational trace languages". | {
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"openwebmath_score": null,
"tags": "formal-languages, reference-request",
"url": null
} |
gravity, light, dark-matter, positional-astronomy, gravitational-lensing
Title: If dark matter bends light, how do we know the stuff in the sky is where we think it is? We measure movement, position, and many other things of an object in space because of its light and what we can measure with it. But as far as I know ... | {
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"tags": "gravity, light, dark-matter, positional-astronomy, gravitational-lensing",
"url... |
definition, conformal-field-theory, bosons
Title: Compactified Boson on the cylinder vs. on the Torus I am a little bit confused if there is a difference between the compactified boson on the torus and on the infinite cylinder.
In the big yellow book from Di Fransesco et altera, the formula for the conformal dimension... | {
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"lm_q2_score": null,
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"openwebmath_score": null,
"tags": "definition, conformal-field-theory, bosons",
"url": null
} |
perl, ssh
my $ssh = Net::SSH::Perl->new("$hostname", port=>$port, debug=>0);
You do not need to quote variable names. New Perls will probably optimize this away, but it's ugly and might introduce bugs. You've done that a couple of times (though not consistently), and I'm not going to mention it again.
Also, your spac... | {
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "perl, ssh",
"url": null
} |
python, python-3.x, google-api
Title: Python function that takes a response from Google Ads API and sorts / aggregates it I am working on this function here and it produces the desired output. I just want to make sure I'm going about things in a smart way.
It effectively just sorts through the data, with consideration... | {
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"tags": "python, python-3.x, google-api",
"url": null
} |
gazebo, ros-kinetic, gazebo-plugin
Originally posted by fitimhalimi with karma: 16 on 2018-05-29
This answer was ACCEPTED on the original site
Post score: 0
Original comments
Comment by JimmyHalimi on 2018-05-29:
Just tried man, and it works, thank you very much | {
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"tags": "gazebo, ros-kinetic, gazebo-plugin",
"url": null
} |
25 June 2018, 9:24 am, and Harvey Goldstein R code explain. We then pass the code work “ under the hood ” and stan multilevel model relevant! Thus may contain many model parameters are allowed to vary by group random models. The unpooled and partially-pooled models Bayesian extensions for multilevel models, and them...... | {
"domain": "webd.pl",
"id": null,
"lm_label": "1. YES\n2. YES\n\n",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.960361158630024,
"lm_q1q2_score": 0.8237671659064492,
"lm_q2_score": 0.8577680995361899,
"openwebmath_perplexity": 2914.198867559362,
"openwebmath_score": 0.4788624048233032,
"tags": nul... |
In [6]:
def occ(n, cache=[0, 1]):
"The expected occupancy for a row of n houses (under misanthrope rules)."
# Store occ(i) in cache[i] for all as-yet-uncomputed values of i up to n:
for i in range(len(cache), n+1):
cache.append(mean(cache[L] + 1 + cache[R]
for (L, R) in runs(i)))
return cache[n]
Let's make sure this ... | {
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"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9525741268224333,
"lm_q1q2_score": 0.8152616537588049,
"lm_q2_score": 0.8558511414521923,
"openwebmath_perplexity": 1502.821566863453,
"openwebmath_score": 0.6529601812362671,
"tags": nu... |
formal-languages, operational-semantics
Title: How is a Transition System in Operational Semantics defined? I'm describing the semantics of a new optimization for Java using Operational Semantics but I'm not sure how to define the transition system.
I found this link :http://www.irisa.fr/celtique/teaching/PAS/opsem-20... | {
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"openwebmath_score": null,
"tags": "formal-languages, operational-semantics",
"url": null
} |
answer choices . Learn what the inverse of a function is, and how to evaluate inverses of functions that are given in tables or graphs. A function is called one-to-one if no two values of $$x$$ produce the same $$y$$. red: The inverse of f is a function which maps f ( x) to x in reverse. For example, a linear function ... | {
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"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9637799482964023,
"lm_q1q2_score": 0.8093187657442072,
"lm_q2_score": 0.8397339736884711,
"openwebmath_perplexity": 715.9731660148466,
"openwebmath_score": 0.6602132320404053,
"tags": ... |
simulation
Comment by shardator on 2017-12-20:
speed of the clock...
Comment by gvdhoorn on 2017-12-20:
Then I would urge you to report that on the proper issue trackers.
If with "ROS core" you actually mean roscpp and the other pkgs in ros_comm, then the tracker would be ros/ros_comm/issues.
Comment by shardator on 2... | {
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"tags": "simulation",
"url": null
} |
ros, cvbridge
Title: problem facing in integration of ROS and OPENCV
hello! i have picked code from cvbridge tutorial of ROS, followed all the steps then build package. node has been created but when i m trying to run that node after running image stream according to tutorial, nothing appear on screen. here is the co... | {
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"tags": "ros, cvbridge",
"url": null
} |
clojure, brainfuck
(defonce state (r/atom {:sourcecode ""
:delay 1
:cell-display-width 3
:brainfuck-input-disabled true
:interpreter-state initial-interpreter-state}))
;; /State --------------------------------------------... | {
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"tags": "clojure, brainfuck",
"url": null
} |
kinetic-theory
Now since our particles are not interacting we can just imagine that we're talking about the one-particle ideal gas, so we only have three velocity variables $v_x, v_y, v_z$ to deal with, and in terms of this any other average of any other quantity is going to be $$\big\langle g(v_x, v_y, v_z) \big\rang... | {
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"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "kinetic-theory",
"url": null
} |
javascript
Title: isType(obj) / getType(obj) - v0 By browser unknown, i mean i don't know how far back support goes for this.
Also, I'm wondering when I can delegate to typeof.
I've heard typeof is faster but the method below is more widely supported and also mentioned in ES5.
/*isType
** dependencies - none
** bro... | {
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"tags": "javascript",
"url": null
} |
c++, strings, hash-map
Use more whitespace to enhance readability of the code
Instead of crowding things together like this:
cout<<"( "<<rev<<","<<temp<<" ), ";
most people find it more easily readable if you use more space:
cout << "( " << rev << ", " << word << " ) ";
Only print words once
Right now, with this inp... | {
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "c++, strings, hash-map",
"url": null
} |
java, algorithm, comparative-review, depth-first-search
for (int index = 0; index < nodes.size(); index++) {
map.put(nodes.get(index), index);
}
return map;
}
/**
* Checks that there is no parents of {@code node} on the right of
* {@code node}, and that there is no chil... | {
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"id": 43651,
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "java, algorithm, comparative-review, depth-first-search",
"url": null
} |
acid-base, equilibrium, aqueous-solution, ions
Title: Why does the ionic product of water remain constant after addition of non-neutral solute? In my textbook, it is given that the ionic product of water $K_\mathrm{w}$ remains constant even when a non-neutral solute such as an acid is added to it.
$$K_\mathrm{w} = \c... | {
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"openwebmath_score": null,
"tags": "acid-base, equilibrium, aqueous-solution, ions",
"url": null
} |
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