text stringlengths 1 1.11k | source dict |
|---|---|
| Brilliant Math & Science Wiki", "The Independence of the Continuum Hypothesis", "The Independence of the Continuum Hypothesis, II", Zeitschrift für Philosophie und philosophische Kritik, https://en.wikipedia.org/w/index.php?title=Cardinality&oldid=998664621, Short description is different from Wikidata, Articles with... | {
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"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9833429638959674,
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"lm_q2_score": 0.8376199714402812,
"openwebmath_perplexity": 714.9079948119803,
"openwebmath_score": 0.7675915360450745,
"tags... |
Equationsin, Integral Curves of First Order Differential Equations, Euler's Method, Successive Approximation, Mechanical Vibrations, Power Series Solutions to Differential Equations SOURCE: Michael R. dx/dt=3x-2y+sin(t) dy/dt=4x-y-cos(t) I have a test tomorrow in my differential equations class and I am struggling to s... | {
"domain": "alberodellerose.it",
"id": null,
"lm_label": "1. YES\n2. YES\n\n",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9925393576394881,
"lm_q1q2_score": 0.8183109043825968,
"lm_q2_score": 0.8244619199068831,
"openwebmath_perplexity": 415.0163270236108,
"openwebmath_score": 0.768282413482666,
... |
ros
Title: Image in rviz using code
I want to write a launch file that can launch RVIZ with image stream by subscribing to a specific topic. Please guide me through this. I can do it manually right now by clicking on the icon and then subscribing to the topic.
Originally posted by akumar3.1428 on ROS Answers with ka... | {
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"tags": "ros",
"url": null
} |
physical-chemistry, quantum-chemistry
Notes
1 I have skipped some stuff. Namely, $\langle \hat{A}\psi |\hat{B}\psi \rangle = \langle \psi |\hat{A}\hat{B}|\psi \rangle$ which is quite straightforward to prove using the hermiticity of both operators; $\langle \psi |\hat{A}|\psi \rangle = a$; $\langle \psi |\hat{B}|\psi ... | {
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"tags": "physical-chemistry, quantum-chemistry",
"url": null
} |
c#, repository
/// <summary>
/// Tries to find Cookie Value and Compare it with our matchwith value.
/// </summary>
/// <param name="SessionId">Session Id of owner</param>
/// <param name="Key">Cookie known as</param>
/// <param name="matchwith">Value to compare with</param>
... | {
"domain": "codereview.stackexchange",
"id": 15097,
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"tags": "c#, repository",
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} |
Because $$\epsilon_1$$ and $$\epsilon_0$$ were arbitrary the claim is proved.
If there are two points for this excercise how many would you give me?
## marked as duplicate by Nosrati, Mark Viola real-analysis StackExchange.ready(function() { if (StackExchange.options.isMobile) return; $('.dupe-hammer-message-hover:no... | {
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"lm_q2_score": 0.8577681031721324,
"openwebmath_perplexity": 800.1561066653719,
"openwebmath_score": 0.38437703251838684,
"ta... |
newtonian-mechanics, energy-conservation, mathematics
Title: Conservation law for Newton mechanics Suppose potential is given by $V(x) = -\int^x F(x')dx'$,where $F$ is force. To show energy $E(x,v)= \frac{1}{2}mv^2 +V(x)$ is conserved when Newton's laws holds.
We need to use the fact that $V(x)$ is differentiable,and ... | {
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"tags": "newtonian-mechanics, energy-conservation, mathematics",
"url": null
} |
c#, file-system, api, web-services, google-drive
static async Task<UserCredential> AuthorizeAgainstGoogleDriveAsync(
string sourceRelativePath = Authorize.RelativeFilePath.Source,
string targetRelativePath = Authorize.RelativeFilePath.Target)
{
using var stream = new FileStream(sourceRelati... | {
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"tags": "c#, file-system, api, web-services, google-drive",
"url": null
} |
urdf, ros-melodic, xml
<alwaysOn>true</alwaysOn>
<updateRate>0.0</updateRate>
<cameraName>/wam_v/camera/front</cameraName>
<imageTopicName>image_raw</imageTopicName>
<cameraInfoTopicName>camera_info</cameraInfoTopicName>
<frameName>front_camera_link</frameName>
<hackBase... | {
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"tags": "urdf, ros-melodic, xml",
"url": null
} |
ros, camera1394
Title: Getting image_color from camera1394
Hi everyone!
I'm trying to get the image from my Fire-i400 1394 camera. In order to do that, I am using the following comands:
$ rosrun camera1394 camera1394_node
$ ROS_NAMESPACE=camera rosrun image_proc image_proc
$ rosrun image_view image_view image:=camera... | {
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"tags": "ros, camera1394",
"url": null
} |
electromagnetism, electrostatics, maxwell-equations
Title: Maxwell equations in absence of magnetic field I always thought that a change in electric field induces a magnetic field and vice-versa. Moreover, I imagined that any current distribution will give rise to a magnetic field. But then I wrote this down: Maxwell'... | {
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"tags": "electromagnetism, electrostatics, maxwell-equations",
"url": null
} |
special-relativity, speed-of-light
Which means I have to make earth goes close to the speed of light while I am still not moving!!
but if I travelled to the speed of light ( from my perspective i am still and the earth is moving)
I am confused now!. I'm afraid you have it backwards. A stationary (inertial) clock takes... | {
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"tags": "special-relativity, speed-of-light",
"url": null
} |
electric-circuits, capacitance, semiconductor-physics, electronics, electrical-engineering
You can see the AC signal, the (bridge) rectified signal, and the signal after the capacitor (with a certain current being drawn). As the capacitor gets larger, the amount of voltage droop will be smaller (the slope of the green... | {
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"tags": "electric-circuits, capacitance, semiconductor-physics, electronics, electrical-eng... |
classical-mechanics
Newton's equation for the motion of the system of particles is
$m_i \ddot{\mathbf x}_i=\mathbf F_i(\mathbf x_1,\dots,\mathbf x_n,\dot{\mathbf x_1},\dots,\dot{\mathbf x_n},t)$.
Now, the force may be written as the sum of the external force and individual forces due to each other particle: $\mathbf F... | {
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"tags": "classical-mechanics",
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} |
This represents the best degree 15 trigonometric approximation to the square wave over $[-\pi,\pi]$ in the $L^2$ sense. The oscillations show the famous Gibbs phenomenon.
### 11.9 References
[Austin, Kravanja & Trefethen 2014] A. P. Austin, P. Kravanja and L. N. Trefethen, "Numerical algorithms based on analytic func... | {
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"lm_q2_score": 0.831143054132195,
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"openwebmath_score": 0.911601722240448,
"tags":... |
your result. In the case of multiplying two matrices, such as C = AB, where neither A nor B are scalars, it must be the case that. Worksheet 01/ Matrix Theory: De nitions & Basic Operations 6 Model 2: Matrix Operations: Matrix Addition & Scalar Multipli-cation A= 2 4 1 2 1 3 0 1 3 5 B= 2 4 4 0 1 1 7 5 3 5 C= 2 4 6 4 2 ... | {
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"id": null,
"lm_label": "1. YES\n2. YES\n\n",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9890130583409235,
"lm_q1q2_score": 0.8198313101749608,
"lm_q2_score": 0.8289388125473629,
"openwebmath_perplexity": 668.8630721038613,
"openwebmath_score": 0.78479182720184... |
ros-melodic
I could not understand very well by the error log what can be done for fixing it. Appreciate if some can help to fix it.
Thanks.
Edit:
Adding CMakeLists.txt from my OpenCV Package.
I could also notice that after trying build/debug with the mentioned VS Code stuff, I now have lots of new folders/files insid... | {
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"tags": "ros-melodic",
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} |
32. Michele_Laino
as a general prescription, the result which you get from a computation has to be as accurate as the less accurate measure
33. anonymous
So how many digits should I state in the answer? Should I round it or not? I normally don't round it unless the question states to do so.
34. Michele_Laino
yes! ... | {
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"lm_q2_score": 0.8577681104440172,
"openwebmath_perplexity": 935.8271231533412,
"openwebmath_score": 0.7765567898750305,
"tags": ... |
newtonian-mechanics, work, potential-energy
2- Is it correct that ∆v should be ≈0 i.e. v=0.01ms-1 so that object may not gain Kinetic energy? Some say that acceleration should be zero or velocity should be constant. But I know that for higher velocities there will be higher K.E. as well. Can we have larger velocity?
3... | {
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"openwebmath_score": null,
"tags": "newtonian-mechanics, work, potential-energy",
"url": null
} |
python, tic-tac-toe
if check_win(test_board, marker):
print("You Won!")
global won
won = True
else:
print("The current position is occupied.")
else:
if check_capacity(test_board, player_in):
result = place_marker(test_board, 'X... | {
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"tags": "python, tic-tac-toe",
"url": null
} |
matlab, digital-communications, downsampling, delay
z=zeros(1,10);
for n=1:10;
k=n+1;
z(1,k)=up(1,n);
end
y=downsample(z,2,1);
subplot(411);
stem(x)
subplot(412)
stem(up)
subplot(413);
stem(z)
subplot(414);
stem(y)
Here is how my output looks like: You should use the built-in upsample() and downsample() func... | {
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"tags": "matlab, digital-communications, downsampling, delay",
"url": null
} |
quantum-mechanics, hilbert-space, operators, momentum, notation
then this implies $\hat{T}(a)|x\rangle\propto|x+a\rangle$, and being $\hat{T}$ unitary this in turn implies $\hat{T}(a)|x\rangle=|x+a\rangle$.
I'm confused about how this is the case. What's inside bras and kets are just labels, so does this mean that ket... | {
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"tags": "quantum-mechanics, hilbert-space, operators, momentum, notation",
"url": null
} |
c++, game, collision, sdl
SDL_Rect wall2;
wall2.x = 256;
wall2.y = 256;
wall2.w = 30;
wall2.h = 40;
while(isRunning) {
while(SDL_PollEvent(&event) != 0) {
if(event.type == SDL_QUIT){
isRunning = fal... | {
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "c++, game, collision, sdl",
"url": null
} |
c++, console, sieve-of-eratosthenes
int main(int argc, char *argv[]) {
if (argc != 2) {
std::cout << "Usage: primesUpTo n\n";
return 1;
}
int n{atoi(argv[1])};
if (n < 0) {
std::cout << "Error: the number must be positive\n";
return 2;
}
std::vector<mytype> resul... | {
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"tags": "c++, console, sieve-of-eratosthenes",
"url": null
} |
Rearrange:
$$30\sqrt{x}=210$$
Divide both sides by 30:
$$\sqrt{x}=7$$
$$x=49$$
Does that help?
Could you help me understand where the 30 comes from in $$x+15=225-30\sqrt{x}+x$$
#### Greg
##### Perseverance
Staff member
Hi AshKetchum and welcome to MHB!
$$(15-\sqrt x)^2=(15-\sqrt x)(15-\sqrt x)=15\cdot15-15\sqrt... | {
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"openwebmath_score": 0.7764949798583984,
... |
# How does one prove that the number $111\ldots 1$ (formed by $3^{n}$ digits all equal to $1$) is divisible by $3^{n}?$
I am self-studying Discrete Mathematics (in Portuguese), and there is one exercise I was not able to solve.
Show that the number $111\ldots 1$ (formed by $3^{n}$ digits are equal to $1$) is divisibl... | {
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"lm_q1q2_score": 0.8436198719801523,
"lm_q2_score": 0.8539127455162773,
"openwebmath_perplexity": 246.0666103708126,
"openwebmath_score": 0.8930598497390747,
"tag... |
home-experiment, equipment, cleaning
The question
Are there any other cleaning agent that'll work better than aqeous Sodium Hydroxide?
Are there any other cleaning agent that'll work better than aqeous sodium hydroxide?
Yes, but I would not recommend them to anybody running experiments at home!
Back in the days in t... | {
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"id": 9969,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "home-experiment, equipment, cleaning",
"url": null
} |
bond, lewis-structure
Title: Sugden's concept of singlet linkage I was reading about the octet rule and saw exceptions in it. Different theories I read further and one of those was Sugden's concept of singlet linkage which state that the octet rule is never violated.
My question is that why Sugden's concept is not tau... | {
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"openwebmath_score": null,
"tags": "bond, lewis-structure",
"url": null
} |
bond, molecular-orbital-theory, allotropes
E. S. Fry, T. Walther, S. Li “Proposal for a loophole-free test of the Bell inequalities,” Phys. Rev. A 1995, 52(6), 4381-4395 (https://journals.aps.org/pra/pdf/10.1103/PhysRevA.52.4381).
J. Koperski, X. Qu, H. Meng, R. Kenefick, E. S. Fry, “Rotational analysis of the (57, 0)... | {
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"openwebmath_score": null,
"tags": "bond, molecular-orbital-theory, allotropes",
"url": null
} |
# Integral involving hyperbolic functions
1. Apr 15, 2012
### sharks
The problem statement, all variables and given/known data
Find $$\int \frac{x}{\sqrt{2x^2-2x+1}}\,dx$$
The attempt at a solution
First, i complete the square for the quadratic expression:
$$2x^2-2x+1=2((x-\frac{1}{2})^2+\frac{1}{4})$$
$$\int \fra... | {
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"lm_q2_score": 0.8152324871074607,
"openwebmath_perplexity": 1899.7000207867532,
"openwebmath_score": 0.9341277480125427,
"ta... |
programming, qiskit, grovers-algorithm, quantum-circuit
However, it does not make sense to me because the operator here is not unitary.
I am wondering if Statevector of Qiskit has actual speed up or it is just for illustration of Grover Search. Besides, how does it realize when the operator is not unitary? The reason... | {
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"tags": "programming, qiskit, grovers-algorithm, quantum-circuit",
"url": null
} |
c#, beginner, game, winforms
protected int PointsPlayer1 { get; set; }
protected int PointsPlayer2 { get; set; }
public void PaddleCollision(Player player, Player player2, Ball ball)
{
if (ball.Bounds.IntersectsWith(player.Bounds))
ball.ballSpeedX = -ball.ballSpeedX;... | {
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"openwebmath_score": null,
"tags": "c#, beginner, game, winforms",
"url": null
} |
c++, strings, parsing
I was just wondering if there is an easier way to call the function, which is one or two lines something like:
std::string possibleAnswers[3] = { "0","1","2" };
std::string response = checkInput(pointerPossibleAnswers, length); | {
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"tags": "c++, strings, parsing",
"url": null
} |
c#, linq
public static class Enumerable
{
public static IEnumerable<(TSource, bool)> WhereResult<TSource>(
this IEnumerable<TSource> source,
Func<TSource, bool> predicate)
{
if (source == null)
{
throw new ArgumentNullException(nameof(... | {
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"tags": "c#, linq",
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} |
python, python-3.x
where, i in itself is serving no purpose. Every occurrence of usage of i is of the form words[i]. You can just iterate over the values of words list itself:
for word in words: | {
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"openwebmath_score": null,
"tags": "python, python-3.x",
"url": null
} |
vectors parallel to it, you need 2) – Caridorc Jan 20 '18 at 18:12. (hint: you need to come up with 2 parametric equations). This online analytical calculator helps you to find the parametric equation of a circle using the radius. I can't just solve for one and make the other t, since both variables are raised to an ev... | {
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"openwebmath_score": 0.8174378275871277,
"... |
c#, minesweeper
//Content
private string[] content = new string[buttonCount];
//MineInfor
private int[] mineinfo = new int[buttonCount];
//Points
private int points;
//Mines string
private List<int> mines = new List<int>(minecount);
//Cells
n... | {
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} |
thermodynamics, electromagnetic-radiation, radiation, thermal-radiation
How does Planck's above explanation correlate with intensity being a function of wavelength or temperature? How does it have a relation to blackbody radiation?
Ps:- I'm a student of 10th grade so please do try to keep the explanation simple.. At t... | {
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"tags": "thermodynamics, electromagnetic-radiation, radiation, thermal-radiation",
"url":... |
arc length calculus II topics in terms of parametric equations integration differentiation. 'S first begin by finding a general formula for arc length of an arc on a 2D-Coordinate system integrals. Parametric equations finding a general formula for computing arc length will be as follows: NOTE finding arc... The surfac... | {
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"openwebmath_score": 0.9759906530380249,
"tags... |
python, python-3.x, interview-questions, integer
max_product = max([x * neg[0] * neg[1] for x in pos])
This is also wrong. Even if you fix the other line, this may multiply the wrong three numbers. For example, consider the input above. The neg variable would hold -6 and -2 (the two smallest negative numbers). So... | {
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"url": null
} |
that you would apply to a 3D model of the camera if you wanted to represent it in the scene). When modelling three dimensions on a two-dimensional computer screen, you must project each point to 2D. This is the currently selected item. Transformation of Stresses and Strains David Roylance Department of Materials Scienc... | {
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"openwebmath_score": 0.5945829749107361,
... |
mechanical-engineering, electrical-engineering, robotics
But the more conventionally approach would probably be two motors each spinning for a mirror for the X and Y axis respectively with one mirror re-directing the laser into the other.
RC servos aren't the most accurate devices. Linearity of input signal vs positio... | {
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"tags": "mechanical-engineering, electrical-engineering, robotics",
"url": null
} |
c#, object-oriented
//Deserialize the Json and returs a list of WalkingData
return JsonConvert.DeserializeObject<List<WalkingData>>(jsonData);
}
//save an instance of WalkingData in Json file
public void Save()
{
List<WalkingData> lstExistingWalking... | {
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E is the only one that I can see speeding up because it is going from -2 to 0, but apparently that is wrong
Imagine someone telling you: "I was going at 2 m/s to the left, then I was going at 0 m/s." Would you tell that person they were speeding up?
Heres my take on it:
A = constant speed forward ( t = 0 - 3 seconds )... | {
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"openwebmath_score": 0.5683655738830566,
"... |
ros, python, msg-subscriber, ros-kinetic
My code to subscribe this topic is as follows. I appreciate your help to identify what about my code is wrong.
import rospy
from openpose_ros_msgs.msg import OpenPoseHumanList
def callback(msg):
for human in msg.human_list:
x = human.body_key_points_with_prob.x
y ... | {
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"openwebmath_score": null,
"tags": "ros, python, msg-subscriber, ros-kinetic",
"url": null
} |
scala, networking
var readCount = {
if (available >= length) length
else available
}
Array.copy(data, readPos, destination, offset, readCount)
readPos += readCount
readCount
}
def skip(length: Long): Long = {
if (readPos < 0) readPos = 0
var readCount = {
if (available... | {
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"lm_q2_score": null,
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"openwebmath_score": null,
"tags": "scala, networking",
"url": null
} |
homework-and-exercises, electromagnetism, special-relativity, forces, reference-frames
laws in the momentarily comoving frame, but you need of course first to calculate the components of the electrical field in this frame. In order to do this, you plug in your $\bf E$ and $\bf B$ components in your EM field tensor $F_... | {
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"tags": "homework-and-exercises, electromagnetism, special-relativity, forces, reference-fr... |
python, game, console, battle-simulation
def move(self, direction, board):
'''To update entity position'''
if direction == 'left' and board.is_valid_move(self, (self.x, self.y - 1)):
self.y -= 1
elif direction == 'right' and board.is_valid_move(self, (self.x, self.y + 1)):
... | {
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"tags": "python, game, console, battle-simulation",
"url": null
} |
power, actuator
A stiffer material may mean that the input power is transmitted more efficiently to the output end of the actuator because the motion isn't "consumed" by flex or deformation in the actuator material.
More efficient actuators then would imply that you could make an actuator that had the same weight but... | {
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"tags": "power, actuator",
"url": null
} |
reinforcement-learning
In practice, the beta parameter is annealed up to 1 over the duration of training. The alpha parameter can be annealed simultaneously, thereby making prioritized sampling more aggressive while at the same time more strongly correcting the weights. And in practice, from the paper you linked, ke... | {
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"tags": "reinforcement-learning",
"url": null
} |
Since $\{s_n\}$ converges to $s$ and $\{t_n\}$ converges to $t$, $\{t_n - s_n\}$ converges to $t - s$. Since $s_n \leq t_n$ for all $n$, each term $t_n - s_n$ is nonnegative. It thus suffices to show that a sequence of nonnegative terms cannot converge to a negative limit (use proof by contradiction). | {
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"openwebmath_score": 0.9927693605422974,
"tag... |
newtonian-mechanics
Since what is the point of K.E. which is frame dependent? How much does K.E.(frame dependent) tell us about reality?(Not much, you pick the frame and get different K.E.!)
However, difference in energy tell us a lot (in fact, conservation of energy is just complement of energy difference)
So at long... | {
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"tags": "newtonian-mechanics",
"url": null
} |
graphs, terminology, sets
Title: What is the difference between Partition and Division? While reading graph theory, I came across different definitions where they use partitions and divisions, I was wondering, are these terms same or different?
Can anyone explain me their difference in Set Theory?
I know this is a sim... | {
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...
Cheers!
lamefeed
Mentor
2021 Award
Thanks for all the good suggestions :)!
Starting to like doing math with complex numbers :)
sign error
#### Attachments
3 KB · Views: 245
lamefeed
Gold Member
another approach is write out ##z = a +bi##
1.) recall that magnitudes (like determinants) multiply. So take the squa... | {
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"lm_q2_score": 0.8558511488056151,
"openwebmath_perplexity": 2059.712096022219,
"openwebmath_score": 0.9246149659156799,
... |
homework-and-exercises, energy, electricity, energy-conservation, power
Title: Calculating energy needed for by a car climbing a slope I'm having a difficult time answering this question. I think I'm just converting the units wrong somewhere:
You're the CEO of a courier company, and you decide to select an electric c... | {
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"tags": "homework-and-exercises, energy, electricity, energy-conservation, power",
"url": ... |
ros, ros2, use-sim-time
Title: Node stuck at launching when launch with use_sim_time
Publisher Node
import rclpy
from rclpy.node import Node
from std_msgs.msg import String
class MinimalPublisher(Node):
def __init__(self):
super().__init__('minimal_publisher')
self.publisher_ = self.create_publisher(St... | {
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"openwebmath_score": null,
"tags": "ros, ros2, use-sim-time",
"url": null
} |
There all 3 typical regimes, determined by the magnitude of $$[1-ha]$$ inside the expression $$y_k= (1-ha)^ky_0$$.
1. Small $$h$$: $$0 \le [1-ha] < 1$$
In this case, $$(1-ha)^k$$ will decay with $$k$$ and always be positve.
We can solve for the range of $$h$$:
$h \le 1/a$
This corresponds to h=0.5 in the above fig... | {
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"openwebmath_perplexity": 1129.366850515747,
"openwebmath_score": 0.9788032174110413,
"tags":... |
java
To compute the next field of the current row, we need to sum up the current field of the current row and the same field of the previous row. The only reason I ended up with the final version is to arguably make the formula look more symmetric. Have I taken things a little too far, and perhaps stick with the origi... | {
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} |
c#, performance, hash-map, console, csv
switch (lineId.Item2.DayOfWeek)
{
case DayOfWeek.Monday:
mondayTot += dictItem.Value;
mondayCount++;
break;
case DayOfWeek.Tues... | {
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"openwebmath_score": null,
"tags": "c#, performance, hash-map, console, csv",
"url": null
} |
quantum-mechanics, quantum-field-theory, operators, differentiation
Let $X$ and $P$ be individual operators satisfying
$$
[X,P]=i.
\tag{1}
$$
The operator $X$ is just one operator, so there is nothing to differentiate here.
Now consider a one-parameter family of operators, with one operator $X(t)$ for each time $t$.... | {
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"url": nul... |
java, array, interview-questions
return Arrays.equals(firstSorted, secondSorted);
}
Looking at the code that way, you can see other issues too...
generally, "Hungarian Notation" is frowned on in Java Code Style - don't have String appended to variable names like firstString and secondString ... we know that they are... | {
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"tags": "java, array, interview-questions",
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} |
terminology, human-computing, computer-vs-human
Although the simulated network is huge, it only represents 1% of the neuronal network in the brain.
K is a peta-scale supercomputer, so, we need an exa-scale machine to completely simulate the whole human brain. These machines will be (probably) available between 2017-2... | {
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"openwebmath_score": null,
"tags": "terminology, human-computing, computer-vs-human",
"url": null
} |
frequency-spectrum, signal-detection, compressive-sensing, spectrum-estimation
But, you'll say, there's superefficient parametric estimators such as ESPRIT, that can get a much higher resolution with less samples!
Yes, that's what I'd have suggested in your situation, in general, too, but you've got to realize that th... | {
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"tags": "frequency-spectrum, signal-detection, compressive-sensing, spectrum-estimation",
"url... |
beginner, c, linked-list
A: If someone held a gun to your head, you would agree to #1.
The scanf function is very, very hard to use correctly. It is even harder to use effectively. The various ways it can fail are difficult for even experienced developers to understand and avoid. Did your pattern allow for white space... | {
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"tags": "beginner, c, linked-list",
"url": null
} |
3. Jan 14, 2010
MATLABdude
To elaborate upon what RoyalCat says, assume you have just a block of glass (width does not matter--the pendant in me says as long as it's sufficiently thin so that not all the light is absorbed). Now assume that you have a beam of light striking at angle $\theta_i$. What angle (in terms of... | {
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"lm_q2_score": 0.8774767810736693,
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"openwebmath_score": 0.6225447654724121,
... |
algorithms, complexity-theory, np-complete
Title: Are all known algorithms for solving NP-complete problems constructive? Are there any known algorithms that correctly output "yes" to an NP-complete problem without implicitly generating a certificate?
I understand that it is straightforward to turn a satisfiability or... | {
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"openwebmath_score": null,
"tags": "algorithms, complexity-theory, np-complete",
"url": null
} |
free-energy
$$\mathrm{d}U = T\mathrm{d}S - p\mathrm{d}V + \sum_{i=1}^{m} \mu_i \mathrm{d}n_i$$
other relevant thermodynamic potentials may be found using the Legendre transform. Helmholtz free energy is defined as a transformation from $(S\rightarrow T)$ and Gibbs free energy by a transformation from $(S\rightarrow T)... | {
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"openwebmath_score": null,
"tags": "free-energy",
"url": null
} |
compilers, assembly
Title: Assembly writer vs compiler in VLIW architecture I read this sentence in a book:
In VLIW architecture, the compiler/and or assembly writer chooses instructions that can be executed in parallel.
What is the difference between assembly writer and compiler? Would an assembly writer also mean... | {
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"openwebmath_score": null,
"tags": "compilers, assembly",
"url": null
} |
newtonian-mechanics, material-science, aerodynamics, aircraft, structural-beam
Is this reasoning the fundamental basis for making wings flexible
(intentionally designing flutter) as well? Or are wings flexible, thus
introducing flutter (which will be aerodynamically undesirable, in at
least a few cases), as a result o... | {
"domain": "physics.stackexchange",
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"tags": "newtonian-mechanics, material-science, aerodynamics, aircraft, structural-beam",
... |
python, performance, robotframework
Test IN RANGE Edge Case 1 - Single Keyword with Single Argument
For Loop IN RANGE 0 1 INDEX0
... \\ Log to Console testlog
*** Keywords ***
Get Blue Squadron
[Return] standing by
Get Green Squadron
[Arguments] ${text}
[Return] stan... | {
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"openwebmath_score": null,
"tags": "python, performance, robotframework",
"url": null
} |
cell-biology
Title: If I want to study protein translocation with RFP as a reporter should I fuse it to the C or N terminus? I want to identify the whereabouts of the signal sequence (signal peptide) on a coding gene and I want to infer this by using RFP or GFP fusion and visualising the location of the fluorescence. ... | {
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"openwebmath_score": null,
"tags": "cell-biology",
"url": null
} |
c++, error-handling, exception
However, what I'd like to know is if my code isn't too complicated
as for an exception class and if it properly handles possible stack trace
generator exceptions and properly falls back to std::runtime_error functionality.
Also, is there some important property/method that all exception... | {
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"openwebmath_score": null,
"tags": "c++, error-handling, exception",
"url": null
} |
infinitesimals: derivatives were defined as ultimate ratios Noté /5. Cauchy (1789–1857). It is troubling how widespread misunderstanding of calculus is 150 years later. Suppose an imaginary number (i) visits the real number line. Bag limits also control the harvest of males and females of many game animals in order to ... | {
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"id": null,
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"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9822877044076956,
"lm_q1q2_score": 0.8227837889578651,
"lm_q2_score": 0.837619961306541,
"openwebmath_perplexity": 1486.1323035085018,
"openwebmath_score": 0.7404050827026367,
"tags": null,
... |
set into two-halves. The rankings range from "Top Quartile" to "Bottom Quartile…. Lower quartile or first quartile: the median of all data below the median Median or second quartile: the middle value of the set of data. Median is the middle data value, at 50% of the data, where there is an equal probability of data val... | {
"domain": "gemsnroll.de",
"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9752018362008348,
"lm_q1q2_score": 0.8105322182592586,
"lm_q2_score": 0.8311430394931456,
"openwebmath_perplexity": 671.4857891771487,
"openwebmath_score": 0.5922364592552185,
"tags": n... |
c#, game, unity3d
protected virtual DynamicMesh CreateWestFace(DynamicMesh currentMeshData, int x, int y, int z)
{
currentMeshData.AddVertex(new Vector3(x - this.HalvedOffset.x, y - this.HalvedOffset.y, z + this.HalvedOffset.z), this.Offset, this.IsCollideable);
currentMeshData.AddVerte... | {
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"tags": "c#, game, unity3d",
"url": null
} |
optics, visible-light, waves, camera
SmarterEveryDay has a video on this effect. A gif taken from that video depicting the effect which is closer to the ruler case is:
The frames on the left are like the actual motion of the strings but the image on the right is the formation of a single frame that is formed by comb... | {
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"tags": "optics, visible-light, waves, camera",
"url": null
} |
c++, beginner, object-oriented, reinventing-the-wheel, sfml
If you compile this code with all warnings enabled (e.g. -Wall -Wextra -pedantic) the compiler will tell you that your initialization is out of order.
This simply means you initialize your members in a different order than they have been declared in. In your ... | {
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"tags": "c++, beginner, object-oriented, reinventing-the-wheel, sfml",
"url": null
} |
slam, navigation, ros-melodic, costmap, global-planner
Comment by skpro19 on 2021-01-14:
By external_map, I mean any map that is being published on the /map topic.
Whenever you are running a program (i.e. node) that publishes on the /map topic, and you want to use that /map topic to build your global_costmap, you woul... | {
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"tags": "slam, navigation, ros-melodic, costmap, global-planner",
"url": null
} |
Of course, we can then solve this to figure out a function for $$P_A$$. We know $$P_A$$ should be a constant value, because its a uniform distribution. By taking a derivative, we can reach the intuitive answer: $$P_A(A) = \frac{1}{|C|}$$ Intuitively if we integrate (or add up) a bunch of $$\frac{1}{|C|}\cdot |A|$$ valu... | {
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"id": null,
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"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9861513881564148,
"lm_q1q2_score": 0.8458892020739035,
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"openwebmath_perplexity": 216.1896405335572,
"openwebmath_score": 0.8782725930213928,
"tag... |
homework-and-exercises, statistical-mechanics
I don't understand how they get the third term, particularly the 1/80 factor. I've often seen this equation expressed just to the tau^2 term, and I understand how to get the 1/12 factor from a binomial expansion of
$$\left( 1 + \frac{\pi^{2}}{8} \left(\frac{\tau}{E}\right)... | {
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"tags": "homework-and-exercises, statistical-mechanics",
"url": null
} |
error-handling, scala, networking
Title: Page download with reattempts in Scala I wrote the following code to deal with possible network problems.
def getPage(browser: Browser, page: String): Document =
{
var attempts = 5
while (attempts > 0) {
try {
return browser.get(page)
}... | {
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"tags": "error-handling, scala, networking",
"url": null
} |
where the function is increasing and decreasing, x-coordinates of the inflection points, open intervals where the function is concave up and concave down, and relative minima and maxima. And the goal here--STUDENT: [INAUDIBLE. 5 yesterday, which fit well with the light curve. Let's look at a couple of techniques for ma... | {
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"id": null,
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"lm_q2_score": 0.8577681122619883,
"openwebmath_perplexity": 1251.2958620737718,
"openwebmath_score": 0.5482892990112305,
"tags"... |
ros, catkin, dependencies
Title: Can catkin/cmake detect the version of a dependency?
The idea would be to pass dependency version information through as a flag and conditionally compile different code paths.
The specific scenario is having packages which depend on a package which I'm in the process of pushing severa... | {
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"id": 16165,
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"tags": "ros, catkin, dependencies",
"url": null
} |
rank of the matrix [A; B]. Matrices and their generalizations change the order of transposed to 3x2, i.e matrices proof-writing or. Also 1+2i given row contiguously in memory and columns of the important terminologies in! Along its main diagonal and above can be obtained by changing rows to columns and columns to.. B =... | {
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"lm_q1_score": 0.9688561676667173,
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"lm_q2_score": 0.8438951025545426,
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"openwebmath_score": 0.6087575554847717,
"tags... |
Here are pictures of $D_k$ for $k=1,\dots,8$ placed side by side with $D_{k}\setminus D_{k-1}$, (made by "hand" from edited versions of this file from wikipedia):
$D_1$:
$D_2$ and $D_2\setminus D_1$:
$D_3$ and $D_3\setminus D_2$:
$D_4$ and $D_4\setminus D_3$:
$D_5$ and $D_5\setminus D_4$:
$D_6$ and $D_6\setminus ... | {
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"lm_q2_score": 0.8198933425148214,
"openwebmath_perplexity": 619.7350754789661,
"openwebmath_score": 0.7024920582771301,
"tags... |
pauli-gates, bell-experiment, non-locality
Title: What would the CHSH inequality be equal to if the two qubits were separable? I am writing an Excel spreadsheet to work through the matrix algebra for a simple Bell's game with the following parameters.
$$\newcommand{\bra}[1]{\langle #1|}\newcommand{\ket}[1]{|#1\rangle}... | {
"domain": "quantumcomputing.stackexchange",
"id": 1603,
"lm_label": null,
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"openwebmath_score": null,
"tags": "pauli-gates, bell-experiment, non-locality",
"url": null
} |
cosmology
What is the overall average temperature of the CMB? (Average over area)
What direction is the overall dipole moment? (Technical way of asking which direction the Earth is moving relative to the average Universe. Easy to grasp in Mollweide. See http://aether.lbl.gov/www/projects/u2/ )
What is the size distrib... | {
"domain": "physics.stackexchange",
"id": 19292,
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"lm_q2_score": null,
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"openwebmath_score": null,
"tags": "cosmology",
"url": null
} |
ros, c++, image, msg
Title: Could rostopic pub the vector keypointsSelection type?
Hallo, experts,
i have a question about rostopic pub: i do something imageprocessing, than calculate the key-points of a image, and i want to use rostopic
pub the vector KeypointsSelection
, that has been detected. but how could i my... | {
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"tags": "ros, c++, image, msg",
"url": null
} |
quantum-mechanics, electromagnetism, gauge-theory, aharonov-bohm
$^\dagger$In fact, electromagnetic gauge transformations preserve not just the Maxwell equations but the Faraday tensor itself. In more complicated (non-Abelian) gauge theories this is not true - the equations of motion are preserved, but the non-Abelian... | {
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"tags": "quantum-mechanics, electromagnetism, gauge-theory, aharonov-bohm",
"url": null
} |
c#, multithreading, thread-safety, lazy
where TryGetOrAdd is defined as follows:
public static class Extensions
{
public static TValue TryGetOrAdd<TKey, TValue>(this IDictionary<TKey, TValue> d, TKey key, Func<TValue> toAdd)
{
if (d.TryGetValue(key, out TValue value))
return value;
... | {
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"tags": "c#, multithreading, thread-safety, lazy",
"url": null
} |
c++, object-oriented, c++11, design-patterns, pointers
Your public insert method would be something like:
void insert(int val)
{
_insert(root, val);
}
Also: add a find function to see if an element is in the tree. Use the find function to write some simple tests. You may rename del to erase to be closer at the s... | {
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"tags": "c++, object-oriented, c++11, design-patterns, pointers",
"url": null
} |
c#, f#, combinatorics, comparative-review
let inline reverse i =
let mutable a = i
let mutable b = myArray.Length - 1
while a < b do
swap a b
a <- a + 1
b <- b - 1
let pivot = findPivot (myArray.Length - 1)
if pivot = -1 then false
else
l... | {
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"tags": "c#, f#, combinatorics, comparative-review",
"url": null
} |
c#
var restCall = new DirectTrackRestCall();
var logger = new ConsoleLogger();
Args args = (Args)Enum.Parse(typeof(Args), string.Join(",", sargs));
if (args.HasFlag(Args.Campaigns))
{
var getter = new ResourceGetter(logger, urls.ListAdvertisers, restCall);
restCa... | {
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"tags": "c#",
"url": null
} |
them. WATCH OUT OP cpa-atmsl. false. Look at the two examples that follow. Be careful here though. 3) sqrt 4 x sqrt 4 = sqrt 16 = 4 For tips on multiplying radicals that have coefficients or different indices, keep reading. It is okay to multiply the numbers as long as they are both found under the radical symbol. To m... | {
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"lm_q1_score": 0.9702399094961359,
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"lm_q2_score": 0.837619959279793,
"openwebmath_perplexity": 852.9584525258998,
"openwebmath_score": 0.8059995174407959,
"tags": n... |
I hope this isn't off topic, but undefined suggests it can be, but just hasn't yet been defined. Would not undefinable be more accurate, in the context of the OP?
Watson
Resident Member
Posts: 4605
Joined: 19 Apr 2009
Location: Earth, middle of the top half, but only briefly each 24 hours.
### Re: Is 0/0 undefined o... | {
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"lm_q2_score": 0.8840392832736084,
"openwebmath_perplexity": 1630.4931841615064,
"openwebmath_score": 0.8781976103782654,
"t... |
particle-physics, mass, neutrinos
The elements of the mixing matrix are exactly the flavor content of each mass state
$$ \nu_\alpha = \sum_{i=1}^3 V_{\alpha,i} \nu_i \,, $$
for $V$ the mixing matrix (in the notation used in 2).
This image (linked rather than imported because I can't find any license information) shows... | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "particle-physics, mass, neutrinos",
"url": null
} |
hubble-telescope, early-universe
Title: Portion of universe visible if gathering image from inflationary epoch Apologies in advance for my over-exposure to pop science. I want to propose a telescope powerful enough to collect imagery from 10^-32 seconds after the “Big Bang”, or as soon as the end of the inflationary ... | {
"domain": "astronomy.stackexchange",
"id": 2907,
"lm_label": null,
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"openwebmath_score": null,
"tags": "hubble-telescope, early-universe",
"url": null
} |
ros, navigation, odometry, base-link, robot-localization
Sending out a nav_msgs/Odometry message with the robot's pose, velocity, and respective covariances
Sending out a transform from the world_frame parameter (e.g., odom) to the base_link_frame parameter (e.g., base_link). Note that this data is the same as the dat... | {
"domain": "robotics.stackexchange",
"id": 29802,
"lm_label": null,
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"lm_q1_score": null,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "ros, navigation, odometry, base-link, robot-localization",
"url": null
} |
observational-astronomy, space-telescope, simbad
Title: How did this artefact end up in the SIMBAD sky map?
I was randomly looking through the SIMBAD sky map when I came across this artefact. It looks like the projection of a telescopes secondary mirror mount to me but I am wondering how that would end up in the map.... | {
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"tags": "observational-astronomy, space-telescope, simbad",
"url": null
} |
c#, game, comparative-review, state-machine, state
public void ActivateHandler(IPlayerConnection playerConnection)
{
playerConnection.SendText($"Did I get it right, {_playerName} (Y/N)?");
}
public void ReceivedLine(IPlayerConnection playerConnection, string confirmation)
{
if (confirm... | {
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"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "c#, game, comparative-review, state-machine, state",
"url": null
} |
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