text stringlengths 1 1.11k | source dict |
|---|---|
biochemistry, cell-biology, immunology
The excerpt looks grammatically incorrect and is therefore confusing. I guess what it tries to convey is — like there can be several probes for a single mRNA in a normal gene-expression microarray, there can be several antibodies binding to different epitopes in the same protein.... | {
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"tags": "biochemistry, cell-biology, immunology",
"url": null
} |
java, concurrency, stack, cache
private void Go() {
TaskStack<String, Integer> stack = new TaskStack<>(TSReviewApp::GetLengthSlow);
ThreadedEvaluator futOutput1 = new ThreadedEvaluator(stack,"How is it going?");
ThreadedEvaluator duplicateFuture1 = new ThreadedEvaluator(stack,"duplicate input"... | {
"domain": "codereview.stackexchange",
"id": 28626,
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"tags": "java, concurrency, stack, cache",
"url": null
} |
The derivative of a function gives us the slope of the line tangent to the function at any point on the graph. Best Answer: If the line is tangent to the circle, then a perpendicular line will pass through the point of tangency to the center of the circle. a circle has equation (x-2)^2 + (y+3)^2=25 d. Now, from the cen... | {
"domain": "uiuw.pw",
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"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9891815519849906,
"lm_q1q2_score": 0.8017107869937098,
"lm_q2_score": 0.8104789109591831,
"openwebmath_perplexity": 181.34237721029245,
"openwebmath_score": 0.605201780796051,
"tags": null,
... |
is the product of these, and is 3. If someone got 0 correct answers means he was guessing with ~0% probability, not 100% as it says now. Then the probability of guessing g is 2^-128. If each question has four choices and you guess on each question, what is the probability of getting exactly 7 questions correct? n = 10 ... | {
"domain": "nxtgeneration.it",
"id": null,
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"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9822877044076955,
"lm_q1q2_score": 0.8248603553577103,
"lm_q2_score": 0.8397339716830605,
"openwebmath_perplexity": 329.75409601172134,
"openwebmath_score": 0.7561070919036865,
... |
electrostatics, multipole-expansion
$$
V(\mathbf r)=\int_\Omega\frac{\rho(\mathbf r')\mathrm d\mathbf r'}{|\mathbf r-\mathbf r'|}.
\tag 1
$$
This is a bit of a big, messy object, because it requires you to carry out a long, complicated three-dimensional numerical integral every time you want to know the value of $V(\m... | {
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"openwebmath_score": null,
"tags": "electrostatics, multipole-expansion",
"url": null
} |
pneumatic
Title: Cylinder Reconditioning When reconditioning of a pneumatic cylinder, which fit between piston and cylinder is required? and how much tolerance between mating parts is required?. Will surface finish inside of cylinder play a major role?. It depends on the application. I think it's better described as p... | {
"domain": "engineering.stackexchange",
"id": 1955,
"lm_label": null,
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"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
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"openwebmath_score": null,
"tags": "pneumatic",
"url": null
} |
calculator as these two are the main concepts of calculus. Integration can be used to find areas, volumes, central points and many useful things. It is often used to find the area underneath the graph of a function and the x-axis. The first rule to know is that integrals and derivatives are opposites! Sometimes we can ... | {
"domain": "staroutlet.shop",
"id": null,
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"lm_q1_score": 0.9773708026035286,
"lm_q1q2_score": 0.8058050146987202,
"lm_q2_score": 0.8244619263765707,
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"openwebmath_score": 0.9296665787696838,
"tags"... |
c#, design-patterns, entity-framework-core
}
Application layer
public class AccountService
{
public decimal CheckBalanceAmount(int bankAccountId)
{
BankAccount bankAccount;
using (var ctx = new AppDbContext())
{
bankAccount = ctx.BankAccounts.Find(bankAccountId);
}... | {
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"id": 35734,
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"openwebmath_score": null,
"tags": "c#, design-patterns, entity-framework-core",
"url": null
} |
[email protected] With the development of the computer during the mid 20th century there came a need for a quick method of determining the discrete Fourier transform of a signal. the convolution of the Fourier transforms, we see that our result will involve a convolution of the forcing term f ( x ) with the inverse Fou... | {
"domain": "mpl-bauen.de",
"id": null,
"lm_label": "1. YES\n2. YES\n\n",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9908743628803028,
"lm_q1q2_score": 0.8361940220815403,
"lm_q2_score": 0.8438951025545426,
"openwebmath_perplexity": 618.223011256596,
"openwebmath_score": 0.8325456380844116,
"tags"... |
python, python-3.x, battleship
Title: Game of Battleship I'm working on a 2-player battleships game in python, although the game is slightly buggy. It sometimes does not allow me to play another game once the first game has finished, and it does not change the location of the ship once the game has moved onto game 2. ... | {
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"lm_q2_score": null,
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"openwebmath_score": null,
"tags": "python, python-3.x, battleship",
"url": null
} |
qiskit
I ran the following code:
circuit = QuantumCircuit(1, simulator, 100)
print('Expected value for rotation pi {}'.format(circuit.run([np.pi])[0]))
Error traceback:
---------------------------------------------------------------------------
CircuitError Traceback (most recent call... | {
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"tags": "qiskit",
"url": null
} |
ruby, ruby-on-rails
This feels smelly, and I have four methods along with three registered callbacks to satisfy this need. I have no logic in the controller and the form is relatively simple.
= form_for @order do |f|
# ...
= f.label :bill_to_shipping_address, class: 'checkbox' do
#{f.check_box :bill_to_... | {
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"tags": "ruby, ruby-on-rails",
"url": null
} |
clustering, matlab, computer-vision
Title: Agglomerative Clustering Stopping Criteria I am trying to implement section 3.4 of paper Predicting Important Objects for Egocentric Video Summarization where they have created a distance matrix of frame histograms.
In short, let say Ω is mean of distances between all frames,... | {
"domain": "datascience.stackexchange",
"id": 485,
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"tags": "clustering, matlab, computer-vision",
"url": null
} |
E[X - \mu]^{3} \right)^{2}}{\left(E[X - \mu]^{2} \right)^{3}}$. Search everywhere only in this topic Advanced Search. Kurtosis of $$x$$ is measured as $\kappa = \frac{E[X - \mu]^{4}}{\left( E[X - \mu]^{2} \right)^{2}}$, and $$\kappa = 3$$ for a normal distribution. Here, the results are split in a test for the null hyp... | {
"domain": "jimchristy.com",
"id": null,
"lm_label": "1. Yes\n2. Yes\n\n",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9658995742876885,
"lm_q1q2_score": 0.8339495851220217,
"lm_q2_score": 0.8633916064586998,
"openwebmath_perplexity": 4628.22776329525,
"openwebmath_score": 0.5811334848403931,
"tag... |
quantum-mechanics, quantum-field-theory, lagrangian-formalism, variational-principle, action
Can one add a few sentences to complete the answer to question 2? In what sense is the quantum motion special? How does it apply to free particles? Or: how can one express the quantum action principle for free particles in wor... | {
"domain": "physics.stackexchange",
"id": 69496,
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"tags": "quantum-mechanics, quantum-field-theory, lagrangian-formalism, variational-princip... |
solve a 2D time-independent Schrodinger equation using Finite Difference Method(FDM). We saw that the shape function is used to interpolate the deflection at each point in between the element. In this case we represent the solution on a structured spatial mesh as shown in Figure 2. The idea is to create a code in which... | {
"domain": "auto-hirch-egelsbach.de",
"id": null,
"lm_label": "1. YES\n2. YES\n\n",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9875683513421314,
"lm_q1q2_score": 0.8292946920005402,
"lm_q2_score": 0.83973396967765,
"openwebmath_perplexity": 840.7911889415304,
"openwebmath_score": 0.4307586550712585... |
quantum-mechanics, fermions, representation-theory, clifford-algebra, anticommutator
$$ \hat{a}_k = \left( \prod_{j=1}^{k-1} \hat{\sigma}^z_j \right)\hat{\sigma}^-_k.$$
Here, I am using the standard Pauli operators $\hat{\sigma}^{x,y,z}$ and $\hat{\sigma}^\pm = \tfrac{1}{2}(\hat{\sigma}^x \pm {\rm i}\hat{\sigma}^y)$, ... | {
"domain": "physics.stackexchange",
"id": 61245,
"lm_label": null,
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"lm_q2_score": null,
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"openwebmath_score": null,
"tags": "quantum-mechanics, fermions, representation-theory, clifford-algebra, anticommutat... |
c++, c++11, recursion, image, matrix
Title: Rotate image 90 degree clockwise recursively Previous question:
Rotate image 90 degree clockwise
In this code I have used tail recursive, which is bad. Time complexity is still \$O(N^2)\$, which is worse-case. The only good part is memory complexity.
How can I improve the re... | {
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"openwebmath_score": null,
"tags": "c++, c++11, recursion, image, matrix",
"url": null
} |
java, performance, multithreading, thread-safety
Title: Synchronous and asynchronous client methods I am working on a project in which I need to have synchronous and asynchronous methods of my Java client. Some customer will call synchronously and some customer will call asynchronously, depending on their requirement.... | {
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"id": 5808,
"lm_label": null,
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "java, performance, multithreading, thread-safety",
"url": null
} |
algorithms
clueVal ← (value of clue n)
groupLength ← (boundRight - boundLeft) + 1
# Not mentioned above, but don't forget to check that group i is not larger than the clue we're trying to match it to
If groupLength <= clueVal:
# Check that the boundaries of group i... | {
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"id": 15234,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "algorithms",
"url": null
} |
# Binomial Expansion Find: $\sum_{k=0}^n\binom{n}{k} 2^k$
Find: $\sum_{k=0}^n \binom{n}{k}2^k$
So I know how to find the coefficients of binomial expansions but I’m not sure how to do this type of problem where I just find the summation.
The example in the book is $\sum_{k=0}^n \binom{n}{k} 4^k$ and the answer is $5... | {
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"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9752018426872776,
"lm_q1q2_score": 0.8147650869155415,
"lm_q2_score": 0.8354835391516132,
"openwebmath_perplexity": 296.8096021521544,
"openwebmath_score": 0.6232320666313171,
"tag... |
ros, ubuntu, ros-fuerte, ubuntu-precise, rosaria
Title: Move a P3AT robot with ROSARIA
Hello.
I got a problem moving the Pioneer 3-AT. Please help me.
I installed a package ROSARIA but I can't move the robot.
I'm using Ubuntu 12.04 asn ROS fuerte.
To install ROSARIA I used :
roslocate info ROSARIA | rosws merge -
ros... | {
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"tags": "ros, ubuntu, ros-fuerte, ubuntu-precise, rosaria",
"url": null
} |
java, android
//Methods that retrieves information. This is performed in the Background thread
private void retrieveInfoFromDevice() {
StringBuilder text = new StringBuilder();
SQLiteDatabase sqLiteDatabase;
sqLiteDatabase = dbHandler.getWritableDatabase();
sqLi... | {
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"id": 10485,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "java, android",
"url": null
} |
speech, segmentation
I've read that strong long-term modulation frequencies between 1-16 Hz are indicative of speech activity, but haven't been able to find any good explanations of what exactly these are. What I've been able to determine so far is that they are the temporal spectrum of specific frequency bands. (Unsu... | {
"domain": "dsp.stackexchange",
"id": 1056,
"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": "speech, segmentation",
"url": null
} |
homework-and-exercises, electrostatics, potential, method-of-images
I had mistakenly assumed that the case being discussed involved symmetrically placed charges, so that following the image process naïvely would lead to positive and negative images coinciding. The problem with the method of images when the angle of in... | {
"domain": "physics.stackexchange",
"id": 42148,
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"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "homework-and-exercises, electrostatics, potential, method-of-images",
"url": nul... |
programming-languages, lambda-calculus, functional-programming
Title: How does one formally show that two lambda functions are $\alpha$ equivalent? I was going through the following slides and I wanted to show the following:
$$ \lambda x. x \equiv_{\alpha} \lambda y . y$$
formally. They define a an $\alpha$-conversion... | {
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"id": 12394,
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"openwebmath_score": null,
"tags": "programming-languages, lambda-calculus, functional-programming",
"url": null
} |
c#, enum
}
foreach (var OppItem in FilterdOppsList)
{
Console.WriteLine(OppItem.OppText);
}
Console.ReadLine(); Shortening ifs
You add everything to the same list so you can concatenate all conditions and use only one if with a helper variable:
foreach (Opportunities Opp in OpportunitiesList)
{
var canAdd =
... | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "c#, enum",
"url": null
} |
orbit
I know the problem can be solved numerically, but I'm interested in finding the equation describing the movement. Since you're interested in the equations of motion, I would solve this problem by using Lagrangian mechanics. Essentially, find the kinetic and potential energies for these two bodies, A and B.
Con... | {
"domain": "astronomy.stackexchange",
"id": 21,
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"openwebmath_score": null,
"tags": "orbit",
"url": null
} |
electromagnetism, magnetic-fields, potential
Then the distance from a point on the loop to ($r_1,\phi_1,z_1$) $=r=|\vec{r_1}-\vec{r'}|=(a^2+r_1^2-2r_1a*cos(\phi-\phi_1)+z_1^2)^{1/2}$
We have,
$$\mathbf{A}(\mathbf{r})=\frac{\mu _0}{4\pi}\int\frac{\mathbf{I}(\mathbf{r'})}
{r}dl'$$
$$\mathbf{A}(\mathbf{r})=\frac{\mu _0I}... | {
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"openwebmath_score": null,
"tags": "electromagnetism, magnetic-fields, potential",
"url": null
} |
python, mathematics
Title: Extended Euclidean algorithm I have programmed the extended euclidean algorithm. Is this a good approach?
def ext_ggT(a, b):
x,y, u,v = 0,1, 1,0
while a != 0:
q, r = b//a, b%a
m, n = x-u*q, y-v*q
b,a, x,y, u,v = a,r, u,v, m,n
gcd = b
return gcd, x, y N... | {
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"openwebmath_score": null,
"tags": "python, mathematics",
"url": null
} |
Output Specification:
For each test case, output in one line the largest sum, together with the first and the last numbers of the maximum subsequence. The numbers must be separated by one space, but there must be no extra space at the end of a line. In case that the maximum subsequence is not unique, output the one wi... | {
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"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9381240177362488,
"lm_q1q2_score": 0.8010760573637591,
"lm_q2_score": 0.853912747375134,
"openwebmath_perplexity": 5419.411773715861,
"openwebmath_score": 0.3704994320869446,
"tags": null,
... |
c#, multithreading, thread-safety
/// <summary>
/// If when calling the callback method
/// the call should be done asynchronously,
/// by default it's called synchronously.
/// </summary>
Async = 2,
/// <summary>
/// Any attempt to s... | {
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "c#, multithreading, thread-safety",
"url": null
} |
c#, performance, linq
if (hashCollision)
{
bool combinationFound = false;
foreach (var extantCombination in extantCombinations)
{
combinationFound = CompareCombinations(sortedValues, extantCombination);
if (combinationFound)
... | {
"domain": "codereview.stackexchange",
"id": 7931,
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "c#, performance, linq",
"url": null
} |
objective-c, ios
Algorithm performance:
The main problem of your algorithm is its complexity. Basically you have two arrays and you compare objects from an array with all objects from the other array. That's O(n^2)
There are many ways how you could improve this, I will list some of them:
Don't use a NSArray to store ... | {
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"openwebmath_score": null,
"tags": "objective-c, ios",
"url": null
} |
reinforcement-learning, papers, autoencoders, generalization, state-spaces
Deep Spatial Autoencoders for Visuomotor Learning
DAQN: Deep Auto-encoder and Q-Network In short, it is much easier for the agent to learn from a smaller dimensional state space. This is because the agent must also do representation learning; i... | {
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "reinforcement-learning, papers, autoencoders, generalization, state-spaces",
"url": nu... |
c
float average(int sum, int number)
{
return sum/(float)number;
}
This reduces the number of loops from 2 into 1. And completely removes the need of having an array of integers. Making your program both memory efficient and fast. | {
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"tags": "c",
"url": null
} |
gazebo
I obtained the following possible answers:
The robot turns a little to the right
before hitting the ground and go
straight. (Most common).
The robot is rotating to the
right while moving in a "straight"
direction.
The robot dumps (also quite common
xD).
I tried to change the start time (setting to 5, 10...) a... | {
"domain": "robotics.stackexchange",
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} |
If you accept the position of the arrowheads ...
r1 /. Line -> Arrow
• This should be posted as a comment if it partially addresses the question. I upvoted your answer,anyhow. I expect to reupdate my post using your suggestion. – Black Milk Sep 10 '14 at 14:21
• How about Show[r1, r1 /. Line[pts_] :> Arrow[pts, 2]]... | {
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"openwebmath_perplexity": 1870.7970892962162,
"openwebmath_score": 0.4286884665489197,
"ta... |
ros, slam, navigation, rtabmap-odometry, rtabmap
With publish_tf set to false, TF will not be published.
cheers,
Mathieu
Originally posted by matlabbe with karma: 6409 on 2018-05-31
This answer was ACCEPTED on the original site
Post score: 4
Original comments
Comment by Jetson_student_group on 2018-06-01:
Hello Math... | {
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"tags": "ros, slam, navigation, rtabmap-odometry, rtabmap",
"url": null
} |
pytorch, weights, linear-regression, tensor, bias
Title: Not able to understand Pytorch Tensor (Weight & Biases) Size for Linear Regression Below are the two tensors
[ 73., 67., 43.]
[ 91., 88., 64.],
[ 87., 134., 58.],
[102., 43., 37.],
[ 69., 96., 70.]
[ 56., 70.],
[ 81., 101.],
[119., 133.],
[ 22., ... | {
"domain": "ai.stackexchange",
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"openwebmath_score": null,
"tags": "pytorch, weights, linear-regression, tensor, bias",
"url": null
} |
lo.logic, type-theory, normalization, parametricity
Suppose now that $T=T_1\rightarrow T_2$. We proceed similarly: take 2 arbitrary terms $u$ and $u'$ such that $u\ T_1\theta\ u'$. We need to show that $t\sigma_1\ u\ T_2\theta\ t\sigma_2\ u'$. But by inversion again, (and the definition of $\eta$-long forms), $t$ must... | {
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"lm_name": null,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "lo.logic, type-theory, normalization, parametricity",
"url": null
} |
python, beginner, fibonacci-sequence
# Run while loop to prompt user enter Fibonacci number
while (run):
text = input('Enter the next Fibonacci number >')
if (text.isdigit()):
t = int(text)
if t == prev_2 + prev_1:
if t <= 50:
prev_2 = prev_1
prev_1 = t
else:... | {
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "python, beginner, fibonacci-sequence",
"url": null
} |
algorithms, arrays
Second Observation:
Consider $1$, the smallest number in the result array. Which number in $A$ should be changed to $1$ so as to incur the least cost? The smallest number of $A$.
Then consider $2$, the next smallest number in the result array. Which number among the remaining numbers in $A$ should ... | {
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"openwebmath_score": null,
"tags": "algorithms, arrays",
"url": null
} |
performance, c, memory-management, reinventing-the-wheel
but this is pointless, since you could have just initialized g_list = NULL; in the first place.
Each time malloc is called, the variable i is incremented. But i is an int, which on many systems has a maximum value of 2,147,483,647. So after this many allocations... | {
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"tags": "performance, c, memory-management, reinventing-the-wheel",
"url": null
} |
homework-and-exercises, coordinate-systems, tensor-calculus, stress-energy-momentum-tensor
\end{equation}
The right hand side will be in terms of $\rho$ and $\theta$. So Finally I just let $\rho \rightarrow \sqrt{r^2 + t^2}$ and $\theta \rightarrow \tan^{-1}\left(\frac{t}{r} \right)$.
However, my end result becomes su... | {
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"tags": "homework-and-exercises, coordinate-systems, tensor-calculus, stress-energy-momentu... |
python, python-3.x
if not isinstance(n, int): # if the value of n isn't an integer - since it has to be one
raise ValueError("nthTerm.calculate(n) only accepts integer values of 'n'.")
if n < 1:
raise ValueError(f"'{n}' is not a non-negative integer higher than 0.")
if... | {
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"tags": "python, python-3.x",
"url": null
} |
correctness-proof, check-my-answer
Step 1: If $2^{11} \in A$. We stop.
Step 2: Pick two equal elements in $A$ and merge them. But how do we make sure there exists such two elements? Suppose the reverse.
If they're all distinct, because all elements are less than $2^{11}$(we've found no $2^{11}(s)$ in step 1), the larg... | {
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "correctness-proof, check-my-answer",
"url": null
} |
python, beginner, unit-testing, heap
Defining a __len__() method implements the builtin len() function for your container class.
Triple quoted strings can have multiple lines, so you don't need to use them at the beginning and end of every line. Docstrings typically go inside a function/method definition not before i... | {
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"openwebmath_score": null,
"tags": "python, beginner, unit-testing, heap",
"url": null
} |
python, performance, programming-challenge
Title: Find total number of phone numbers formed by the movement of Knight and Bishop on keypad I recently took a test on HackerRank, and submitted my answer for the following question. I passed all the test cases but company told me that the answer is not efficient, and they... | {
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\medskip\noindent
Here we say that $M \to N$ is injective if all the maps $M_i \to N_i$
are injective. In fact, we will identify $M_i$ with the image of
$M_i \to N_i$, i.e., we will think of $M_i$ as a subset of $N_i$.
We will use the description of the colimits given in
Section \ref{section-limit-sets} without further... | {
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"openwebmath_score": 0.9809542298316956,
"tags": nul... |
signal-analysis, continuous-signals, integration
my attempt:
$(a)$ $\displaystyle\int_{-\infty}^{\infty} f(t) dt=2 u (t)+r(t)-r(t-T)+Ku(t-T)$
then we draw it's diagram and found it was unbounded so,we doubt how area can be zero for any value of $K$ so, we need help here finding value of K (which we think will come ne... | {
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"tags": "signal-analysis, continuous-signals, integration",
"url": null
} |
c++, beginner, game
}
}
void fightAttack() { //attack function
if (fight_energy == 0) {
cout << "\t\t\t\tNot enough energy! Use your shield to boost her!\n";
imgFightNPC();
}
en_fight_hp = fightNPC(en_fight_hp, damage, en_shield);
hero_fight_hp = fightHeroNpc(hero_figh... | {
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D\subset X\setminus \bigcup_{k=1}^n P_k \}$ is infinite be defined. Let $X_n=X\setminus \bigcup_{k=1}^n P_k$. Then there is a measurable $E_1\subset X_n$ such that $0<\mu(E_1)<\mu(X_n)$. Let $E_2:=X_n\setminus E_1$. We put $$V_1=\{\mu(D): D \textrm{ is measurable}, D \subset E_1 \},$$ $$V_2=\{\mu(D): D \textrm{ is meas... | {
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"lm_q1q2_score": 0.8130861444789108,
"lm_q2_score": 0.8289388019824946,
"openwebmath_perplexity": 100.17748898269063,
"openwebmath_score": 0.9883548021316528,
"ta... |
turtlebot
Title: trying to save a turtlebot map with android
I am having issues with the two android_make_a_map.launch and android_map_nav.launch
When trying to save the map from make_a_map.launch I get the following error on my android.
"naming map couldn't even start: no such service save_map of type map_store/save... | {
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"id": 8186,
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"tags": "turtlebot",
"url": null
} |
gazebo-gui
Your function returns a bool which indicates if the event was handled or not. So if you return false, the event will be propagated onwards. Return true to stop propagation.
bool MyPlugin::OnMouseRelease(const common::MouseEvent &_event)
{
// Do what you want to do and decide if you want to propagate the e... | {
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"tags": "gazebo-gui",
"url": null
} |
rotational-kinematics
usually linear velocity is the velocity of a point rotating around the axis of rotation given by
$$ \vec v = \vec{\omega} \times\vec{r} $$ when object has no translational motion but if the object has both translational and rotational motion then $\vec v$ will be measured from Center-of-momentum ... | {
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"url": null
} |
(Here, we view the polynomials $f(x)=x^3-x^2+3x-1$, $g(x)=x^3+2$ as polynomials of $\mathbb{Z}_p[x]$)
Thus, it suffices to investigate the prime divisors of the resultant: if $r$ is a divisor of the resultant $Res\big(f,g\big)=k$, then any solution of the simultaneous polynomial equations:
$$f(x) \equiv 0 \mod r \\ g(... | {
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"lm_q2_score": 0.8104789155369047,
"openwebmath_perplexity": 320.5234471512781,
"openwebmath_score": 0.9304338097572327,
"tags": n... |
algorithms, computational-geometry
Title: Calculate winding number How can one calculate the winding number of a polygon given as
a list of vertices in some (counter-clockwise or clockwise) order?
The complexity of the algorithm must be linear time. The winding number $w$ of a polygon has to be calculated around a cer... | {
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"openwebmath_score": null,
"tags": "algorithms, computational-geometry",
"url": null
} |
quantum-gate, unitarity, quantum-state
Title: Hadamard gate for qudit (dimesion 8) I am using the code for generating the gates for qu8it
The resultant gate is not unitary (and so not hermitian too). I am a bit confused with the result. Is it possible for a quantum gate to be non-unitary? When I take the just real or ... | {
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"tags": "quantum-gate, unitarity, quantum-state",
"url": null
} |
mechanical-engineering, mechanisms, mechanical
How far this concept from reality? A disk shaped threadmill seems somewhat problematic from a technical perspective. Placement of actuators and moving of the surface material seems much more problematic in a disk than other shapes. Speed of actuators need to be nonuniform... | {
"domain": "engineering.stackexchange",
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"tags": "mechanical-engineering, mechanisms, mechanical",
"url": null
} |
beginner, object-oriented, game, vba, excel
You can find the workbook here:
https://github.com/Evanml2030/Excel-SpaceInvader
Note that you cannot import and run Gameboard.frm without the corresponding Gameboard.frx file. Frx is a proprietary Microsoft file type that degenerates into alien symbols inside notepad, not s... | {
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"tags": "beginner, object-oriented, game, vba, excel",
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} |
c#, .net
if (CompressedStore)
writer = new GZipStream(writer, CompressionLevel.Optimal);
using (writer)
{
serializer.Serialize(writer, data);
}
This avoids the duplication and so it's shorter, but it's also less obviously correct (using combined with new is a good pattern, and it's not used here), so I think ... | {
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"tags": "c#, .net",
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Fermat
Active member
So, we need to show that $\langle Ef | g \rangle = \langle f | Eg \rangle$ for all $f,g\in L_{2}$. This is tantamount to showing that
$$\frac{1}{2} \int_{ \mathbb{R}}\left[ f(x)+f(-x) \right]^{*} g(x) \, d\mu = \frac{1}{2} \int_{\mathbb{R}} f^{*}(x) \left[ g(x)+g(-x) \right] \, d\mu,$$
or
$$\int_{... | {
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"openwebmath_score": 0.9324895143508911,
"ta... |
estimation, neutrinos, biophysics, perception, cosmic-rays
This probability multiplied by the neutrino flux through your head indicates there are $6\times 10^{-6}$ s$^{-1}$ neutrino interactions in your head, or roughly one every two days.
Whether that would produce any perceptible effect in your brain needs to be sh... | {
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"tags": "estimation, neutrinos, biophysics, perception, cosmic-rays",
"url": null
} |
javascript, array, canvas
// new
// not needed: curr is coord and prev is prevCoord
Now, the drawing commands become the following:
// old
context.moveTo(prev.x, prev.y);
context.lineTo(curr.x, curr.y);
// new
context.moveTo(prevCoord.x, prevCoord.y);
context.lineTo(coord.x, coord.y);
Store the current as previous
... | {
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"openwebmath_score": null,
"tags": "javascript, array, canvas",
"url": null
} |
electromagnetism, special-relativity, speed-of-light, gauss-law, causality
Four field lines enter it radially and only one exits radially. But three extra field lines exit transversely, so the radiation field ensures that Gauss's law keeps working. (And it keeps working no matter how quickly you kick the charge: kicki... | {
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"tags": "electromagnetism, special-relativity, speed-of-light, gauss-law, causality",
"ur... |
everyday-chemistry, smell
Title: Does a smell imply particles or chemicals in the air? (I know little science so please help me if I'm in the wrong place or if my question needs editing. I could use help with tagging, for example.)
If I can smell something then does that mean there are particles or chemicals in the ai... | {
"domain": "chemistry.stackexchange",
"id": 11004,
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"openwebmath_score": null,
"tags": "everyday-chemistry, smell",
"url": null
} |
special-relativity, classical-mechanics
First, lets switch to the Polyakov-type action
$$ S[X, e] = \int d \tau \, \frac{1}{2} \left( \frac{\dot{X}^2}{e(\tau)} - e(\tau)\, m^2 \right). $$
It can be shown that it is equivalent to the (mentioned by you) Nambu-Goto type action by solving the E/L equation for $e(\tau)$ (w... | {
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"tags": "special-relativity, classical-mechanics",
"url": null
} |
python, python-3.x, matrix, pandas
# Calculate first the denominator since we slice the big matrix
# In dataframes that only have accessed the base firm
denominator_df = df_matrix.loc[(df_matrix[base] == 1)]
denominator = denominator_df.sum(axis=1).values.tolist()
denomi... | {
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"openwebmath_score": null,
"tags": "python, python-3.x, matrix, pandas",
"url": null
} |
## Code (centered column):
\documentclass{article}
\usepackage{amsmath}
\usepackage{calc}
\newcommand*{\Widest}{b_2 b_2 b_2}%
\newcommand*{\Center}[1]{\makebox[\widthof{$\Widest$}]{$#1$}}%
\begin{document}
\begin{alignat}{3}
a_1 a_1 a_1 & \le \Center{a_2 } && \le a_3 a_3 a_3 \\
b_1 & \le \Center{b_2 b_2 b... | {
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"openwebmath_perplexity": 2046.4642327058993,
"openwebmath_score": 0.9735262989997864,
"tag... |
algorithms, time-complexity, combinatorics, permutations
Title: Faster algorithm for specific inversion count (part 2) Following the issue from Faster algorithm for a specific inversion:
We have a permutation (a derangement actually) $\sigma$ of the set $\{0,1,\dots,n-1\}$ with cardinality $n$.
I want to compute certa... | {
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"openwebmath_score": null,
"tags": "algorithms, time-complexity, combinatorics, permutations",
"url": null
} |
python, beginner, python-3.x, primes
def all_primes_set(lista):
lista_set = set(lista)
return len(primes_set & lista_set) == len(lista_set)
On my machine all of these are faster than your original function:
primes_list = list(prime_sieve(100000))
%timeit primes_op(primes_list)
77.3 ms ± 373 µs per loop (mean... | {
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"openwebmath_score": null,
"tags": "python, beginner, python-3.x, primes",
"url": null
} |
java, recursion, time-limit-exceeded, backtracking, knapsack-problem
if (arrayWithGeneratedNumbers[i] != 0) { // ignore 0, because I left units with 0 behind on the ground
currentStrength += strengths.get(i);
}
}
if (currentStrength > max) { // is my current strength better ... | {
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"openwebmath_score": null,
"tags": "java, recursion, time-limit-exceeded, backtracking, knapsack-problem",
"url":... |
ros-kinetic
Output << unit_test_test:check /home/toby/wepods_ws/logs/unit_test_test/build.check.004.log
/usr/bin/cmake -H/home/toby/wepods_ws/src/wepods_ros/unit_test_test -B/home/toby/wepods_ws/build/unit_test_test --check-build-system CMakeFiles/Makefile.cmake 0
cd /home/toby/wepods_ws/build/unit_test_test; catk... | {
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"tags": "ros-kinetic",
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beginner, haskell, recursion, interpreter, brainfuck
Use State and lens to carry state around instead of manual threading.
Use monad-loops to spin the loop instead of manual tail calls.
prevBracketIndex should avoid recursion too by using lists of indices.
Initial depth is always 0 in prevBracketIndex so it should be ... | {
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"openwebmath_score": null,
"tags": "beginner, haskell, recursion, interpreter, brainfuck",
"url": null
} |
javascript, jquery, ajax
$.template('occurrence_tmpl', OCCURRENCE_TMPL);
OK, so strictly it's an array of string literals, but that's to make JSLint happy. I then use this:
result = $.tmpl('occurrence_tmpl', data);
occurrence_div = form.find('.recurrenceinput_occurrences');
occurrence_div.replaceWith(result);
This i... | {
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"openwebmath_score": null,
"tags": "javascript, jquery, ajax",
"url": null
} |
c#
Insert(insertLog,
new[]
{
new SqlParameter("@UserKey", userKey),
new SqlParameter("@ObjectName", className),
new SqlParameter("@Property", property),
new SqlParameter("@NewValue", valueNew),
new SqlParameter("@Pr... | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "c#",
"url": null
} |
ros-kinetic
Title: get rid of warning: Inbound TCP/IP connection failed
I get this warning intermittently:
Inbound TCP/IP connection failed:
connection from sender terminated
before handshake header received. 0
bytes were received. Please check
sender for additional details.
I see this sometimes when a subscriber u... | {
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"openwebmath_score": null,
"tags": "ros-kinetic",
"url": null
} |
power-spectral-density
Is the highlighted part applicable as definition of "power" in "power spectrum" as well?
Yes. It's what I'd recommend to use. Power is just the square of some amplitude signal.
If so, is "(electric power) spectrum" incorrect translation because the "power" spans other types of physical power i... | {
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"tags": "power-spectral-density",
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} |
dynamical systems you had to learn a lot about numerical methods. m Matlab m-file for portraying an IFS based on a matrix of values henon. Analysis tools include power spectrum calculation and Poincare sections. (Leave out the special case when one of the eigenvalues is 1. By creating phase plane diagrams of our system... | {
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"lm_q2_score": 0.8479677545357568,
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"openwebmath_score": 0.6228296756744385,
"tags": nu... |
If my reasoning is incorrect, please let me know. Thanks again!
#### JeffM
##### Elite Member
For a polynomial of degree 4, $$\displaystyle f(x)\rightarrow\infty$$ as $$\displaystyle x\rightarrow\pm\infty$$ and so there must be an odd number of extrema. If there were an even number, then either $$\displaystyle f(x)\r... | {
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"lm_q1q2_score": 0.8447648373090627,
"lm_q2_score": 0.8723473862936942,
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"openwebmath_score": 0.7015562057495117,
... |
c++, assembly
string comparison
statement.front() == std::string("LTORG")
does not need to construct a string on the right-hand side; simply compare the string literal, and the left-hand side's overloaded == will do the right thing.
enums
//find the type of statement
unsigned short type = 0;
should be using an enum ... | {
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"openwebmath_score": null,
"tags": "c++, assembly",
"url": null
} |
weights are the lengths of the corresponding sides. This point of concurrency is called the incenter of the triangle. Find ,nLADC. Then, as , it follows that and consequently pentagon is cyclic. The centroid is _____ in the triangle. The incenter is deonoted by I. The altitudes of a triangle are concurrent. The perpend... | {
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"lm_q1_score": 0.9719924802053235,
"lm_q1q2_score": 0.8479150963784783,
"lm_q2_score": 0.8723473829749844,
"openwebmath_perplexity": 794.3205136913356,
"openwebmath_score": 0.57602858543396,
"tags": null,... |
newtonian-mechanics, forces, friction, free-body-diagram
Title: Why do we bounce back if we push a wall? Suppose we push a wall with some force $F$, and the friction between the wall and my hands is $F_{fr}$. If we push a wall, we see that we bounce back, which means the wall applied a force greater than what we appli... | {
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"tags": "newtonian-mechanics, forces, friction, free-body-diagram",
"url": null
} |
which shows that exp(zw) is not equal to exp (exp(z),w)</p> <p>another one a continuous function of a complex variable need not have primitive in a region.the example is f(z) = square ( | z| ). </p> http://mathoverflow.net/questions/16829/what-are-your-favorite-instructional-counterexamples/71645#71645 Answer by Chandr... | {
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"openwebmath_perplexity": 970.2770908274482,
"openwebmath_score": 0.8440715670585632,
"tags... |
c++, hash-map
dict.addOrMod("Key", 5);
std::cout << dict.find("Key") << "\n";
std::cout << *dict.find("Key") << "\n";
} Dict.h
Do not do this.
using namespace std;
Especially in a header file. You are polluting the namespace for everybody that uses your header file (and you will break peoples code). Some peop... | {
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"tags": "c++, hash-map",
"url": null
} |
soft-question, mathematics, models
But what can be done in the next row? Starting the gravitation-experiment on earth, this experiment can be done on other planets or with other heavy objects. The experiment is not easy in most cases and the results are only other very special cases.
In the theoretic description the s... | {
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"tags": "soft-question, mathematics, models",
"url": null
} |
• Thank you for the example ! If we add the condition that $\Vert f(x) \Vert$ must "explode" on $C$, in some sense, then your function $f$ shall have a minimum on a reflection of $C$ ($\lbrace x_{n+1} > x_{1}^{2} + \ldots + x_{n}^{2} \rbrace$). Does that follow from some theorem ? Aug 9 '16 at 14:25
• I think one way y... | {
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"lm_q2_score": 0.8152324826183822,
"openwebmath_perplexity": 144.22969002124097,
"openwebmath_score": 0.8786675930023193,
"tag... |
quantum-mechanics, wavefunction
Title: Does a wave packet have finite size? Does the “amplitude” of a particle's wave packet decrease to 0 at some finite distance? I think a general statement for a wavepacket cannot be made. There could be wavepackets like those representing a particle in a deep quantum well that go z... | {
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"tags": "quantum-mechanics, wavefunction",
"url": null
} |
homework-and-exercises, classical-mechanics, rotational-dynamics, moment-of-inertia
Note that maybe by accident the error you made in the $I_{xy}$ term cancels
$$I_{xy}=I_{yx}\\=\int_Axy\rho dA\\=\rho\int_xxdx\int_yydy\\=\rho\tfrac{1}{2}x^2|_0^{0.3}\tfrac{1}{2}y^2|_0^{0.6}=0.18\text{ kg}\,\text{m}^2.$$
Hope this helps... | {
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"tags": "homework-and-exercises, classical-mechanics, rotational-dynamics, moment-of-inerti... |
electrostatics, electric-fields, gauss-law
I should point out that it is the nature of electrostatics that makes flux a physically important quantity. In particular, the flux, as defined in the way you defined (i.e., the surface integral of the vector inner-product of the field at a point and the area element of the c... | {
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"tags": "electrostatics, electric-fields, gauss-law",
"url": null
} |
homework-and-exercises, statistical-mechanics, ising-model, mean-field-theory
$$H(\{s_i\},J) = -J \sum_{\langle ij\rangle}^{(1)}s_is_j$$
and immediately proceeded to write the configurations, then terms like
$$- e^{4K}(e^{8Km}\pm e^{-8Km})$$
for 4 $+$ spins, and so on. However, it was a huge leap and I cannot fill in ... | {
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"tags": "homework-and-exercises, statistical-mechanics, ising-model, mean-field-theory",
... |
c++, json, lex, yacc
int JsonRecParser::JsonValueParse(int val)
{
switch(val)
{
case '{': return JsonMapParse(lexer.yylex());
case '[': return JsonArrayParse(lexer.yylex());
case yy::JsonParser::token::JSON_STRI... | {
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"openwebmath_score": null,
"tags": "c++, json, lex, yacc",
"url": null
} |
rostopic
<param if="$(arg tabletop_segmentation_convert_to_base_link)" name="x_filter_max" value="1.0" />
<param if="$(arg tabletop_segmentation_convert_to_base_link)" name="table_z_filter_min" value="-0.5" />
<param if="$(arg tabletop_segmentation_convert_to_base_link)" name="table_z_filter_max" value="-0.01" /> | {
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"openwebmath_score": null,
"tags": "rostopic",
"url": null
} |
python, algorithm, python-3.x, backtracking, n-queens
to
def generateSolution(board, col=0): | {
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"tags": "python, algorithm, python-3.x, backtracking, n-queens",
"url": null
} |
derivative is different from the logarithm function. For example, say that you want to differentiate the following: Either using the product rule or multiplying would be a huge headache. View Logarithmic_Differentiation_Practice.pdf from MATH AP at Mountain Vista High School. Problems. 11) y = (5x − 4)4 (3x2 + 5)5 ⋅ (5... | {
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"lm_q1_score": 0.957277806109987,
"lm_q1q2_score": 0.8399890647682559,
"lm_q2_score": 0.8774767986961403,
"openwebmath_perplexity": 559.350464254909,
"openwebmath_score": 0.9357950091362,
"tags": null,
"url"... |
special-relativity, visible-light, photons, mass, speed-of-light
Second, what implications would this have on the expansion of the universe? We know that universe is expanding faster than light can keep up with it due to what we know of space-time. Would there be any kind of possible correlation between this new $c$ a... | {
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"tags": "special-relativity, visible-light, photons, mass, speed-of-light",
"url": null
} |
If a sequence has two subsequences that do not both converge to the same limit, then the sequence does not converge.
This can be proven using the $\epsilon-\delta$ definition of convergence:
• Let $a_n$ converge to $L$, and let $\{a_{n_k}\}_{k\to\infty}$ be a subsequence of $a_n$.
• Let $\epsilon > 0$.
• Then, becaus... | {
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"lm_q2_score": 0.8824278741843884,
"openwebmath_perplexity": 119.0916195551768,
"openwebmath_score": 0.9875617623329163,
"tag... |
java, enum, lambda
/**
* Creates a {@link Map} with <code>E</code>.{@link #toString()} for the keys and <code>E</code>
* as the values.
*
* @param forEnum the {@link Enum} to represent.
* @return a {@link Map} with mappings <code>String → E</code>.
* @see #createReverseEnumMap(Set)
... | {
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"tags": "java, enum, lambda",
"url": null
} |
climate, planetary-science, ice-age, mars
On a more discussion based addition to the question, could factors such as ice albedo and other feedback loops play a similar role in Mars' ice ages that they do in Earth's ice ages?
I have also asked this at the Astronomy stack exchange here If I understood it correctly, the ... | {
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"tags": "climate, planetary-science, ice-age, mars",
"url": null
} |
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