text stringlengths 1 1.11k | source dict |
|---|---|
c#, html, css, asp.net-core
private Css _css;
public CssProvider(IFileProvider fileProvider)
{
_fileProvider = fileProvider;
}
public async Task<Css> GetCss(string fileName)
{
if (_css is null)
{
var cssFile = _fileProvider.GetFileInfo(fileName);
us... | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "c#, html, css, asp.net-core",
"url": null
} |
ros
Title: pointcloud access data
Hi
I have a subscribed topic with the type sensor_msgs::PointCloud2.
I do not need the pcl library. I just want to iterate through each point and take the Z value. but i have no clue how to do this with sensor_msgs::PointCloud2 and i dont find an example.
Do I really need pcl for eas... | {
"domain": "robotics.stackexchange",
"id": 11450,
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"tags": "ros",
"url": null
} |
acoustics, lightning
Lightning is a large current that ionizes the air in its immediate vicinity. Such ionized air is conductive. Having more conductive air near power lines can cause arcing between adjacent conductors in extreme cases. It can also cause more than usual corona discharges as the remnants of the ioni... | {
"domain": "physics.stackexchange",
"id": 16048,
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"openwebmath_score": null,
"tags": "acoustics, lightning",
"url": null
} |
perform the sine function on it. Glenna Rogers. Out of these, the cookies that are categorized as necessary are stored on your browser as they are essential for the working of basic functionalities of the website. Note that the radian is a derived unit in the International System of Units (SI). 19.1 A circle has a cent... | {
"domain": "sintap.pt",
"id": null,
"lm_label": "1. YES\n2. YES\n\n",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9873750496039276,
"lm_q1q2_score": 0.8002466571712248,
"lm_q2_score": 0.810478913248044,
"openwebmath_perplexity": 577.8516825216227,
"openwebmath_score": 0.8369142413139343,
"tags": n... |
waves, definition
Title: How do we count beats? Books say that one beat constitutes two successive maxima of sound intensity with a minima in between. This is confusing me as the definition of beat period says - it is the time interval between two successive beats ( which would mean four successive maxima with two suc... | {
"domain": "physics.stackexchange",
"id": 18157,
"lm_label": null,
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"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "waves, definition",
"url": null
} |
photoelectric-effect
Take the zero of electric potential energy of the charged sphere as zero.
As the electrons leave the surface of the conducting sphere the lose kinetic energy and gain electric potential energy, $eV$ where $V$ is the potential difference between the position of the electron and the surface of the s... | {
"domain": "physics.stackexchange",
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"lm_q2_score": null,
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"openwebmath_score": null,
"tags": "photoelectric-effect",
"url": null
} |
software
Title: Halogen bonds in QuteMol I've been using QuteMol for generating 3D animated molecular images and I've encountered a problem; for some reason that's a complete mystery to me when I create a pdb file for etravirine (using MarvinSketch to create a sdf file and then using OpenBabel to convert the sdf to pd... | {
"domain": "chemistry.stackexchange",
"id": 1029,
"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": "software",
"url": null
} |
javascript
} //end Board class Joe, here's some quick comments based on a cursory inspection. Note you are in danger of starting bike shedding with your question. :) My comments are really personal opinion.
So this is Browser code using the Speech Synthesis API which has good support. it's good you that you are doing ... | {
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"tags": "javascript",
"url": null
} |
python, python-3.x, random
In this code:
In my opinion (opinions can be very subjective) the code is still readable, but has less functions and those have explicit long names, which helps users to understand it faster.
I also put some general parameters as uppercase module variables at the top of the file; this makes... | {
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"tags": "python, python-3.x, random",
"url": null
} |
to 2 decimal places. Problem A meteorologist is inflating a spherical balloon with a helium gas. So, You have to figure out how fast the radius is changing, so. A balloon is not a straight edged polygon shape, usually, so the mathematical equations get that much harder, on the flip side, it may be a spherical or ovalis... | {
"domain": "comefaretradingonlinebft.it",
"id": null,
"lm_label": "1. YES\n2. YES\n\n",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9881308810508339,
"lm_q1q2_score": 0.8008592313124419,
"lm_q2_score": 0.8104789018037399,
"openwebmath_perplexity": 339.69184886938785,
"openwebmath_score": 0.865911602... |
java, caesar-cipher
On to the actual algorithm:
A StringBuilder isn't really needed here. Internally a StringBuilder is just a char array, that is "automatically" extended if needed. But since you know how long the resulting string will be you don't need the automatic extending, so either at least initialize the Strin... | {
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"tags": "java, caesar-cipher",
"url": null
} |
genetics, microbiology, bacteriology
The Creation of eDNA
The release of eDNA (extracellular DNA) can occur via spontaneous excretion or autolytic action.
There are known mechanisms for the release eDNA like formation of blebs (Dorward and Garon 1990). This extracellular DNA production is affected by many physiochemi... | {
"domain": "biology.stackexchange",
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "genetics, microbiology, bacteriology",
"url": null
} |
quantum-field-theory, energy, interactions
In general, the ground state can differ from the (interacting) vacuum state, spontaneously breaking Lorentz symmetry and leading to a preferred frame. Spontaneous symmetry breaking of this type is necessary if $P^\mu|\Omega\rangle\neq 0$, and the preferred frame is the one in... | {
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"id": 24578,
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"openwebmath_score": null,
"tags": "quantum-field-theory, energy, interactions",
"url": null
} |
c++, networking, windows
Socket::Socket()
{
// Initialize the winsock
if ((WSAStartup(MAKEWORD(2, 2), &winsock) != 0))throw winsock_initialize_error();
}
SOCKET Socket::get_socket(int type)
{
switch (type)
{
case TCP:
if ((sock = socket(AF_INET, SOCK_STREAM, 0)) == INVALID_SOCKET) throw so... | {
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"id": 28921,
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"tags": "c++, networking, windows",
"url": null
} |
gazebo
Originally posted by dmeltz on Gazebo Answers with karma: 127 on 2014-04-03
Post score: 0
I would say that Nate already answered this question in the gazebo mailing list. Here is the content of Nate's answer:
Retroreflective values are stored in collision shapes, and these values are read by the CPU ray senso... | {
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"tags": "gazebo",
"url": null
} |
android, singleton, kotlin, firebase
companion object {
///val instance = SingletonModel()
var questions = mutableListOf<QuestionBO>()
var results = mutableListOf<ResultBO>()
fun updateQuestion(questionsFromServer:MutableList<QuestionBO>){
questions = questionsFromServer;
... | {
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"lm_q2_score": null,
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"openwebmath_score": null,
"tags": "android, singleton, kotlin, firebase",
"url": null
} |
java, programming-challenge, computational-geometry, interval
Title: CodeEval's SkyScrapers challenge This is a solution to CodeEval's SkyScrapers challenge.
You are given a list of triples \$(l, h, r)\$. Each triple represents an axis-aligned rectangle, with top-left corner at \$(l, h)\$ and bottom-right corner at \$... | {
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"tags": "java, programming-challenge, computational-geometry, interval",
"url": null
} |
beginner, php, object-oriented, session, role-playing-game
You should get in the habit of explicitly setting accessibility information on your class properties and methods. Without these, everything on your class is public. This may be OK for simple applications, but can be really bad in working with more complex app... | {
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"tags": "beginner, php, object-oriented, session, role-playing-game",
"url": null
} |
ros, slam, navigation, 3dslam
For processing the clouds as a map, you could subscribe to the openni driver and the /tf frames from rgbdslam, assemble the clouds according to the received transformation and then run the pcl code on it.
Sending data to other machines can be done by ROS (more or less) out-of-the-box.
If ... | {
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"openwebmath_score": null,
"tags": "ros, slam, navigation, 3dslam",
"url": null
} |
python, strings
for j, phrase in enumerate(phrases):
if 'right' in phrase:
mod = dict(enumerate(phrase))
for key in mod:
if mod[key] == 'r' and mod[key+4] == 't':
i = key
mod[i] = 'l'
mod[i+1] = 'e'
... | {
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"id": 36357,
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"openwebmath_score": null,
"tags": "python, strings",
"url": null
} |
java, algorithm, library
/**
* The set of variables present in this clause.
*/
private final Set<BinaryVariable> positiveBinaryVariableSet =
new TreeSet<>();
/**
* The set of negated variables in this clause.
*/
private final Set<BinaryVariable> negatedBinaryVariableSet = ... | {
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"id": 25089,
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"openwebmath_score": null,
"tags": "java, algorithm, library",
"url": null
} |
symmetry, group-theory, representation-theory
What is the intuition behind it? I have been told that we require the matrix element to transform as a scalar (essentially be invariant) under the symmetry operations which would mean that the matrix element corresponds to the identity representation. However, I don't find... | {
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"openwebmath_score": null,
"tags": "symmetry, group-theory, representation-theory",
"url": null
} |
hash, probabilistic-algorithms
def add(value):
self.array(self.hash[ value ]) = True
Is the hash necessary? Why can't we use a random number generator right away?
def add(value):
self.array(int(m*random.random())) If I understand the question correctly, the answer is simple: if Hash(object) returns 27 whe... | {
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"id": 1791,
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"openwebmath_score": null,
"tags": "hash, probabilistic-algorithms",
"url": null
} |
python, python-3.x, web-scraping, beautifulsoup
for link in page_soup.findAll("a"):
if "psc=" in str(link):
link_to_get = prefix + str(
link.get("href")
)
links.add(link_to_get)
print(f"Got link {lin... | {
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"tags": "python, python-3.x, web-scraping, beautifulsoup",
"url": null
} |
c#, programming-challenge, interview-questions, stack
else
{
return false;
}
}
else if (curr == ']')
{
if (myStack.Count > 0)
{
var top = mySta... | {
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"openwebmath_score": null,
"tags": "c#, programming-challenge, interview-questions, stack",
"url": null
} |
c++, c++20, odbc
Amazingly enough, in C++17 and later, the compiler can even deduce all template parameter types from that constructor.
To create a tuple that will act as the DTO type we need to map from C++ column types to what ODBC expects. The helper template DTOType is there to do that:
template<typename> struct D... | {
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"tags": "c++, c++20, odbc",
"url": null
} |
python, performance, beginner, algorithm, mathematics
DIVIDER_DASH_LINE = '-' * 50
GREEN_APPLE = '\U0001F34F'
RED_APPLE = '\U0001F34E'
magic_squares = (
[[4, 3, 8],
[9, 5, 1],
[2, 7, 6]],
[[8, 1, 6],
[3, 5, 7],
[4, 9, 2]],
[[1, 14, 4, 15],
... | {
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "python, performance, beginner, algorithm, mathematics",
"url": null
} |
hydrology, glaciology
There are factors that influence this behaviour. The general case described above concerns so-called temperate glaciers. Glaciers at very high elevations and latitudes may be completely below the freezing point. There may also be permafrost in surroundings. Under such circumstances the storage vo... | {
"domain": "earthscience.stackexchange",
"id": 348,
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"tags": "hydrology, glaciology",
"url": null
} |
Since $|G|=n_1n_2 \cdots n_k,$ it’s clear from $(*)$ that $|G|$ divides $|\text{End}(G)|.$
iii) Using $(*)$ in ii), we have
$n=|G|=n_1n_2 \cdots n_k=|\text{End}(G)|= n_1^{2k-1}n_2^{2k-3} \cdots n_k$
if and only if $k=1,$ i.e. $n=n_1$ and so $G \cong \mathbb{Z}_{n_1}=\mathbb{Z}_n. \ \Box$
Example 1. Let $p$ be a pri... | {
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"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9802808730448281,
"lm_q1q2_score": 0.8037257529759197,
"lm_q2_score": 0.8198933337131076,
"openwebmath_perplexity": 95.63939031809484,
"openwebmath_score": 0.969171941280365,
"tags": n... |
javascript, object-oriented, design-patterns, modules
var splashScreen = (new sg.splashScreen).init();
var employeeJsonCall = (new sg.employeeJsonCall).init(); About code style, I highly recommend you to read angular code style even if you have no idea what is it. It contains a lot of sanity approaches about how to ma... | {
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"openwebmath_score": null,
"tags": "javascript, object-oriented, design-patterns, modules",
"url": null
} |
javascript, php, html, mysql, css
//if the result still contains text.. dont display it and error out
if (checkResult($result)) {
setResult("Error: Result contains unknown text."); //write error message
setBox("error"); //set the box to type error
... | {
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"openwebmath_score": null,
"tags": "javascript, php, html, mysql, css",
"url": null
} |
c#, multithreading, producer-consumer
This is the Semaphore implementation:
private static Semaphore isFull = new Semaphore(buffSize, buffSize);
private static Semaphore isEmpty = new Semaphore(0, buffSize);
static void produce()
{
for (int i = 0; i < valuesToProduce; i++)
{
isFull.WaitOne();
... | {
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"openwebmath_score": null,
"tags": "c#, multithreading, producer-consumer",
"url": null
} |
geometry, turbomachinery
Title: Turbocompressor spool geometry How come axial compressors always narrow and turbines always widen towards the rear? From what I know:
The speed of sound of air increases with temperature, therefore increases (decreases) as it goes through the compressor (turbine).
The compressor and tu... | {
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"openwebmath_score": null,
"tags": "geometry, turbomachinery",
"url": null
} |
z-tests, the squared Mahalanobis distance is D² = (1-r²)-1 (z 1 ² – 2rz 1 z 2 + z 2 ²), which once again follows a chi-square distribution with 2 degrees of. Euclidean distance d E(p;p is) = p (p p is)T(p p is) Mahalanobis distance d M = p (p p is)TM is(p p is) M is - symmetric, positive-de nite matrix M is - de nes ho... | {
"domain": "pontevecchioparquet.it",
"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9893474872757474,
"lm_q1q2_score": 0.8134307460368096,
"lm_q2_score": 0.8221891261650247,
"openwebmath_perplexity": 1350.3428928883864,
"openwebmath_score": 0.776372492313385,
... |
javascript, mathematics, collision
ctx.beginPath(); // You dont need to use moveTo after beginPath
ctx.lineTo(A.x, A.y);
ctx.lineTo(B.x, B.y);
ctx.stroke();
ctx.setTransform(1,0,0,1,0,0);
requestAnimationFrame(update);
}
<canvas id="canvas" width = "400" height= "400"></... | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "javascript, mathematics, collision",
"url": null
} |
ros, turtlebot3, windows10
Original comments
Comment by osilva on 2022-01-14:
Hi @rushik, can you please explain what installation did you use for Windows 10? Also are you comparing simulations or working with the actual turtlebot3? Finally can you show the steps for launching teleop for Windows10?
Comment by rushik o... | {
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"tags": "ros, turtlebot3, windows10",
"url": null
} |
Discrete Mathematics and its Applications (math, calculus) - Kenneth Rosen | All the textbook answers and step-by-step explanations ... Discrete Mathematics and its Applications, by Kenneth H Rosen. Discrete Mathematics II: Set Theory for Computer Science Part IA Comp. I have been trying to work on this question and th... | {
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"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.966410494349896,
"lm_q1q2_score": 0.825230247508156,
"lm_q2_score": 0.8539127548105612,
"openwebmath_perplexity": 1225.8404414427655,
"openwebmath_score": 0.5750621557235718,
"tags": n... |
$$I_{(0,0)} (y, x^3-y^2) \overset 6 = I_{(0,0)} (y, x^3) \overset 5 = I_{(0,0)}(x,y) + I_{(0,0)}(x,y) + I_{(0,0)}(x,y) \overset 4 = 1 + 1 + 1 = 3 .$$
The same computations could be done for the second example, it is just that they are more tedious. First, let us translate the curve such that the cusp moves from $(1,0)... | {
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"openwebmath_score": 0.8502720594406128,
"tags"... |
ros, ubuntu, ros-fuerte, ubuntu-precise, uwsim
Title: UWSim, Ubuntu 12.04, ros-fuerte installation problem
Hello,
I am trying to install UWSim in Ubuntu 12.04 with fuerte installed. I checked out the repository from here
svn checkout http://uji-ros-pkg.googlecode.com/svn/trunk/underwater_simulation underwater_simulat... | {
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and also generalized functions in the case of PiecewiseIntegrate. Know the definition of definite integral for a general function. $\begingroup$ Using Piecewise is better, but an alternative is Integrate[PiecewiseExpand@f[x], {x, -3, 7}], which converts the function to Piecewise. In Nspire CAS, templates are an easy way ... | {
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"lm_q1_score": 0.9416541659378681,
"lm_q1q2_score": 0.8112710456992343,
"lm_q2_score": 0.861538211208597,
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"openwebmath_score": 0.8796647191047668,
"tags": null,
... |
quantum-mechanics, homework-and-exercises, statistical-mechanics, phase-space, semiclassical
(For quantum systems in one space dimension the volume means the area as in the question).
(In the above asymptotically refers to the limit where both quantities are large, for example in the semiclassical approximation $\hbar... | {
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"tags": "quantum-mechanics, homework-and-exercises, statistical-mechanics, phase-space, sem... |
forces, pressure
Title: Force and Area are proportional to each other, but I have read on book the next following sentence:
The force is proportional to the area, for if we increase the area but keep the number of molecules per cubic centimeter the same, we increase the number of collisions with the piston in the sam... | {
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f#, playing-cards
let hasFifty =
hasSeqOf 4 >> function // there can be only one (four in a row)
| Some(cl) :: _ -> Some(cl)
| _ -> None
// Two separate functions for Hundred because sometimes they exist in the
// same hand and share a card , but the card can be only in one project.
let hasHundredOn... | {
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java
BruteForceSATSolver.java
package net.coderodde.sat;
import java.util.HashMap;
import java.util.Map;
import java.util.Set;
public final class BruteForceSATSolver implements SATSolver {
@Override
public Map<BinaryVariable, Boolean>
findSatisfyingAssignment(Formula formula) {
Set<BinaryVa... | {
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javascript, jquery, google-chrome, bookmarklet
var lightboxImageBlank = "https://www.oxfordlearnersdictionaries.com/external/images/lightbox-blank.gif?version=2.3.41";
if (document.readyState != 'loading'){
initEntry('See more', 'See less');
} else if (document.addEventListener) {
document.addEve... | {
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harmonic-oscillator
{*} Or plot amplitude versus time on semi-log paper if you are doing this the old-school way. Or plot log(amplitude) versus time on linear--linear graph paper. Then extract the slope. | {
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• Think of it like this: in the original $x$-coordinates, the components of the ODE trajectory may be correlated in some sense to one another. This is due to the coupling between different coordinates of $x$ through the structure of $A$. When we diagonalize $A$, we are changing coordinates to a system where we remove t... | {
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"openwebmath_score": 0.9541980028152466,
"ta... |
biochemistry, metabolism
The overall demand for NADPH for biosynthesis is > 80% of total cytosolic NADPH production (Figure 4b), with a majority of this NADPH consumed by fatty acid synthesis. At least in transformed cells growing under aerobic conditions, most cytosolic NADPH is devoted to biosynthesis, not redox def... | {
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"tags": "biochemistry, metabolism",
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java, strings
The example input and output is listed as below.
Input String
Start Keyword
End Keyword
Output
"Java is a class-based, object-oriented programming language that is designed to have as few implementation dependencies as possible"
""(empty string)
""(empty string)
"Java is a class-based, object-oriented ... | {
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python, python-3.x, interview-questions, complexity, pathfinding
if len(self.paths) < 1 is better written as if len(self.paths) == 0 or if not self.paths
In self.neighbors you perform a check to see if an adjacent node is outside the maze. Try moving this logic into self.adjacent
Instead of solving recursively, which ... | {
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"url": nul... |
c++, binary-search, set
// In-order traversal
Node_Iterator & operator++();
Node_Iterator operator++(int);
T & operator*() { return n->_value; }
T * operator->() { return &n->_value; }
Node_Iterator & operator=(Node_Iterator<T> it) { n = it.n; return *this; }
friend class Set<T>;
};
template <cla... | {
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electrical-engineering, power-electronics, temperature
Oh yeah, and the interior temperature must be within -20°C to +65°C.
If you need any information before you can help me, please go ahead and ask. Also, as I've stated above, I am new to engineering, so if you are trying to help me, please explain as much as you ca... | {
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machine-learning, data-mining, predictive-modeling, feature-selection, feature-engineering
As for q2, you need to look at support_ attribute of the RFECV object. It returns a boolean mask that corresponds to X.columns (if True, then that feature is selected, if False, then not). You can also look at ranking_, but it p... | {
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organic-chemistry, nmr-spectroscopy
Title: Strange 1H-NMR signals/signal ratio Fedorov et al. assign the $^1$H-NMR ($\ce{CDCl3}$) chemical shifts of the $\ce{CH2}$ group in 2-(bromomethyl)phenylboronic acid
to three singlets at $4.75$, $5.09$ and $5.15~\ce{ppm}$ in a ratio of $3:3:14$.
Can someone explain their reaso... | {
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The statement is true. Let $X$ be an infinite Hausdorff space. It will suffice to show that we can find a nonempty open set $V_1$ such that $X\setminus\overline V_1$ is infinite. (Then we find $V_2$ in the same way with the infinite Hausdorff space $X\setminus\overline V_1$ playing the role of $X$, and so on.)
At any ... | {
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"lm_q2_score": 0.8289388040954683,
"openwebmath_perplexity": 71.73179782195339,
"openwebmath_score": 0.9560031294822693,
"tags... |
javascript, game, ecmascript-6, dom, snake-game
score++;
if(apple.type === "superapple") {
speed = 1.10*speed;
score += 4;
}
apple.move();
} else {
this.segments.pop();
};
}
changeDirecti... | {
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"tags": "javascript, game, ecmascript-6, dom, snake-game",
"url": null
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javascript, game, constructor
MajorPoint.prototype = Object.create(Phaser.Sprite.prototype);
MajorPoint.prototype.constructor = MajorPoint;
var EndPoint = function(game, x, y, state, callback, callbackContext) {
MajorPoint.call(this, game, x, y, 'start-end', 0);
//If end is not reachable, hides this object.
//... | {
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c#, beginner
}
}
class Item
{
public string Name { get; set; }
public float Price { get; set; }
public int Popularity { get; set; }
} First, I'm going to show you some interesting points.
1. The callstack
You're calling some methods recursively. A recursive method calls itself. See in SearchChecker() and ... | {
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quantum-mechanics, photons, energy-conservation, reflection
Does the wavelength of the photon change during elastic scattering (mirror reflection)? If a mirror reflection affected the energy of the photons to a large extent the colors would change, and it would not be a "true mirror"
The fact that the colors do not ch... | {
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ros, catkin, win-ros, windows, ros-groovy
That added a Cmake prefix variable to the config.cmake that winros_init_build makes that allowed it to find the main ros workspace and everything built correctly afterwards.
Originally posted by david.hodo with karma: 395 on 2013-03-19
This answer was ACCEPTED on the original... | {
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"url": null
} |
hector
Originally posted by Stefan Kohlbrecher with karma: 24361 on 2014-03-16
This answer was ACCEPTED on the original site
Post score: 1
Original comments
Comment by Stefan Kohlbrecher on 2014-03-17:
You have to set "trajectory_source_frame_name" to a frame that is part of your robot (for example /base_link).
Comme... | {
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c++, beginner, linked-list, reinventing-the-wheel
would not require any additional changes in the return types:
auto *L2 = new ListNode<T>(node->value);
It is common to use lowercase letters for variable names, even though you create all the list objects in uppercase.
Moreover, it looks nicer. But, do not overload yo... | {
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performance, csv, assembly
ReadLine proc
mov bufferOffset, arg0 ; initialize [bufferOffset]
mov bufferTail, arg1 ; initialize [bufferTail]
mov isQuotedSequence, arg2 ; initialize [isQuotedSequence]
cmp bufferOffset, bufferTail ... | {
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quantum-mechanics, quantum-field-theory, field-theory, harmonic-oscillator, quantum-optics
Yes, we can also take $V(\phi)$ to be a square-well potential, but at sufficiently low energies $V$ might as well be a low-order polynomial, at least if spacetime is four-dimensional. (The story is richer in lower-dimensional sp... | {
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slam, navigation, octomap, turtlebot, ros-fuerte
Comment by Devasena Inupakutika on 2013-03-19:
SLAM gMapping.
Comment by Devasena Inupakutika on 2013-03-22:
Hi Jon, For SLAM to work with kinect, I have created three launch files as follows --> one for kinect_laser to transform point cloud data to laser scan data, one... | {
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rospy
When I try to run my code called: the surp_controller.py
surp_controller.py is completely based on gopigo_controller.py .
I receive the following errors:
File "/home/rmb/gopigo_ws/src/gopigo_controller/src/surp_controller.py", line 230, in <module>
main();
File "/home/rmb/gopigo_ws/src/gopigo_controller/s... | {
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localization, navigation
Title: robot initial localization
Hi, every one, I have build a map with Pioneer robot P3AT now, and the navigation node alse seems run well. But there is one question:
How to initial localize the robot in the map?
That is to say, the problem of "global localization", after we fire up the nav... | {
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be continuous at x 0.In particular, any differentiable function must be continuous at every point in its domain. As a verb continued is (continue). Theorem: If a function f is differentiable at x = a, then it is continuous at x = a Contrapositive of the above theorem: If function f is not continuous at x = a, then it i... | {
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"lm_q1_score": 0.9752018434079933,
"lm_q1q2_score": 0.804016796731388,
"lm_q2_score": 0.824461932846258,
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"openwebmath_score": 0.91771608591... |
GMAT Changed on April 16th - Read about the latest changes here
It is currently 24 Apr 2018, 15:46
### GMAT Club Daily Prep
#### Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.
Customized... | {
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"lm_q1_score": 1,
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"lm_q2_score": 0.8198933337131076,
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"openwebmath_score": 0.39354509115219116,
"tags": null,
"url": ... |
terminology, vectors, group-theory, representation-theory
Title: What is the vector representation of $\mathrm{SO}(6)$? What is meant by the vector representation of $\mathrm{SO}(6)$?
I have only encountered the term vector representation in the context of the Lorentz group $\mathrm{SO}(1,3)$, where it refers to the ... | {
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"tags": "terminology, vectors, group-theory, representation-theory",
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Let $$X_1,...,X_N \sim \text{IID U} \{ 1,...,k \}$$ be your sample data and let $$W = \sum_{i=1}^N \mathbb{I}(X_i=7)$$ be the number of sevens in the sample. Since you are sampling with replacement via uniform sampling, the random variable $$W$$ follows a binomial distribution with probabilities given by the proportion... | {
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"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9861513875459069,
"lm_q1q2_score": 0.8085389530207316,
"lm_q2_score": 0.8198933381139646,
"openwebmath_perplexity": 355.32491773510765,
"openwebmath_score": 0.99822598695755,
"tags... |
python, colab, javascript
Title: Audio not saving in google colab # all imports
from IPython.display import Javascript
from google.colab import output
from base64 import b64decode
RECORD = """
const sleep = time => new Promise(resolve => setTimeout(resolve, time))
const b2text = blob => new Promise(resolve => {
co... | {
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geology, atmosphere, air-pollution, mining
Because of this, it is not possible to create a formula that can be used everywhere that will state how far an active underground mining region must be from surface buildings.
The other factor which would need to considered is the manner of construction of the buildings near ... | {
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "geology, atmosphere, air-pollution, mining",
"url": null
} |
quantum-mechanics, hilbert-space, superposition, quantum-states
Note; I think my question differs from this post.
The OP of that post already understands the presence and meaning of the minus sign, but rather asks why the minus sign is associated with $S=0$, which is a different question.
Yet this question has been ma... | {
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"tags": "quantum-mechanics, hilbert-space, superposition, quantum-states",
"url": null
} |
image-processing, linear-algebra, 3d, eigendecomposition
How can I obtain a matrix from the 3D image I obtain after applying it a (3x3x3) discrete Laplace operator?
If there is no way to obtain a matrix, then I should compute the eigenvalues and eigenvectors of a 3D structured grid. What is the simplest way to do this... | {
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"openwebmath_score": null,
"tags": "image-processing, linear-algebra, 3d, eigendecomposition",
"url": null
} |
rosbag
Title: How to modify the bag file?
I planned to test the result of kinect signal after some information in points cloud is corrupt to simulate the bit error after wireless transmission.
So I firstly save these points could data by rosbag, and I can replay it to rviz project.
However, I then want to change cert... | {
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"tags": "rosbag",
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ros
Originally posted by joq with karma: 25443 on 2012-10-09
This answer was ACCEPTED on the original site
Post score: 1
Original comments
Comment by aldo85ita on 2012-10-10:
Hi @joq, I edited my post ading more information. I suspect that the origin of timestamp problem (showed in the Warning above) is due to "/came... | {
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homework-and-exercises, electromagnetism, electromagnetic-radiation, interference, plane-wave
If your application is radar tracking, then perhaps you are interested in Crosseye effects (Google "Crosseye", it's an angle deception countermeasure, typically intended for use against trackers). If this is the case, you ar... | {
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by a, and so rewrite this as. This is t is equal to minus 3, minus 2, minus 1, 0, 1, 2, and so forth and so on. Since the surface of a sphere is two dimensional, parametric equations usually have two variables (in this case #theta# and #phi#). This is called a parameter and is usually given the letter t or θ. Example $... | {
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"id": null,
"lm_label": "1. YES\n2. YES\n\n",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9828232909876815,
"lm_q1q2_score": 0.8293997542238286,
"lm_q2_score": 0.8438950947024556,
"openwebmath_perplexity": 579.4427026364159,
"openwebmath_score": 0.810407... |
• What about the order of power calculation?? – Hamid Reza Ebrahimi Jan 29 '17 at 3:47
• @HamidRezaEbrahimi If you see my answer, you can see the order in which he calculate powers. First calculate $56^{78}$. Then calculate $34^{56^{78}}$. Then calculate $12^{34^{56^{78}}}$. – S.C.B. Jan 29 '17 at 3:51
• Start from the... | {
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"lm_q1_score": 0.9579122720843812,
"lm_q1q2_score": 0.8141978146197092,
"lm_q2_score": 0.8499711699569786,
"openwebmath_perplexity": 844.8267391070639,
"openwebmath_score": 0.9124524593353271,
"tag... |
json, clojure
(defn add-embedded-resources
"Adds multiple embedded resources as members of a resource group mapped to
rel. If there already exist resources mapped to rel, adds the new resources
to the existing resource group. Takes the resources as:
* Single resource
* Collection of resources
* Vari... | {
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"tags": "json, clojure",
"url": null
} |
ros, source, ros-package-path, setup.bash
Title: Unexpected behaviour of "source devel/setup.bash"
OS: Ubuntu 14.04
ROS: Indigo Turtle
Bash: Terminator
Hello,
I have encountered an undesirable behaviour while working with ROS related to sourcing workspaces. First of all I have two workspaces which contain similar pac... | {
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"url": null
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# show that $P$ is partially ordered set by $\subseteq$
Let $Y$ be a set and suppose$P \subseteq \mathcal{P}(Y)$. Show that $P$ is partially ordered set by $\subseteq$.
So I start off with $\mathcal{P}(Y)=\{\emptyset\subseteq,......\subseteq P....\subseteq..\subseteq Y\}$
How should I use now the reflexivity, antisy... | {
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"openwebmath_score": 0.8254692554473877,
... |
motor, power, circuit, driver
It looks like there's an application note specifically for your product. It says, in part: | {
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ros, gazebo, sensor
Originally posted by prasanna.kumar with karma: 1363 on 2013-01-09
This answer was ACCEPTED on the original site
Post score: 1
Original comments
Comment by gordon on 2013-01-11:
@prasanna.kumar
Thanks, it worked. How silly of me! | {
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If you do merely prove each from another of them, then what you have done is to show that they are all EQUIVALENT--that is, IF one is true, then they all are. But then either they are all true, OR they are all false. You don't know which!
I think the pages I referred you to answer this question, by explaining the ro... | {
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"lm_q2_score": 0.8354835350552604,
"openwebmath_perplexity": 490.923540117864,
"openwebmath_score": 0.6749465465545654,
"tag... |
markov-decision-process, policies, bellman-equations, transition-model
As $P$ is given, we treat, equation $\ref{2}$ as a linear equation in $V$.
But $P[i][j] = \sum_a (\pi(a \mid j) \times \mathrm{p}(i \mid j, a) )$. But, $ \pi (a \mid s)$ (i.e., probability that I will take action a in state s) is NOT given.
So, how... | {
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "markov-decision-process, policies, bellman-equations, transition-model",
"url": null
} |
kinematics, acceleration, rotational-kinematics
$$ [\dot{\omega}_b]_\times = \ddot{R}_{ab}{R_{ab}}^T + \dot{R}_{ab}{\dot{R}_{ab}}^T \label{2}\tag{2}$$
In this way $[\dot{\omega}_b]_\times$ is also an anti-symmetric matrix, something that contradicts the answer in this post. Why $\dot{\omega}_b$ should not be computed ... | {
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"tags": "kinematics, acceleration, rotational-kinematics",
"url": null
} |
biochemistry, chemical-biology
The $\ce{Na^+-K^+}$–ATPase is an antiport that generates a charge separation across the membrane, because for every three positive charges exit the cell for every two that enter.
The key to how it functions lies in the precise phosphorylation of a specific Asp residue of the transport pr... | {
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"id": 6417,
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"openwebmath_score": null,
"tags": "biochemistry, chemical-biology",
"url": null
} |
python, regex, file
MyOutputFilename Not_this_file
OutputFilename this_file_should_change
# Next line should have value "no change"
OutputFilenameAndSome no change
# Multiple
AnotherConfig AnotherValue
YetAnother config value with multiple spaces
# Flawed
FinalFlaw What if the value has OutputFilename as part of text? | {
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"tags": "python, regex, file",
"url": null
} |
c++, c++11
class Square : public Shape
{
bool Equals(const Shape& s) override
{
try
{
const Square& other = dynamic_cast<const Square&>(s);
// condition to check equality.
}
catch(std::bad_cast&)
{
return false;
... | {
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"tags": "c++, c++11",
"url": null
} |
ros, gazebo, simulation, simulator-gazebo, gazebo-plugins
rosinstall ~/ros-gazebo /opt/ros/diamondback ~/ros-gazebo/workspace
cd ~/ros-gazebo/workspace
svn co https://code.ros.org/svn/ros-pkg/stacks/simulator_gazebo/tags/diamondback simulator_gazebo
source ~/ros-gazebo/setup.bash
rosmake gazebo_worlds | {
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"tags": "ros, gazebo, simulation, simulator-gazebo, gazebo-plugins",
"url": null
} |
entropy, information
Title: How much entropy is in the word 'bed'? I am referring to one of the first examples in Shannon's famous paper. I (think I) understand the concept of average entropy of a system, but let's say we are interested in a specific sequence of letters that system generates, like 'bed'.
I guess by sa... | {
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"tags": "entropy, information",
"url": null
} |
ros, husky, begginer-tutorials, roscpp, ros-indigo
*/
const std::string topic_name = "/husky_velocity_controller/cmd_vel";
ros::Publisher velocity_pub = node.advertise<geometry_msgs/Twist>(topic_name, 1000);
//node.advertise() will publist the topic with the specified name. The second argument is ... | {
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"tags": "ros, husky, begginer-tutorials, roscpp, ros-indigo",
"url": null
} |
python
# Hash table containing words in low-ranked profiles.
LOW_WORDS = {}
These aren't constants, so they shouldn't be global or in ALL_CAPS
# Number of users in each category
hi = 0
low = 0
Once you actually start logic, its best to do it inside a function except for really simply scripts.
# Add training data to ... | {
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To see why this is true, suppose first that $x$ is in the null space of $A$. This means that $Ax=\vec 0$. Multiplying both sides of this equation by $E$, we see that $(EA)x=E\vec 0 =\vec 0$, meaning that $x$ is also in the null space of $EA$. Now suppose that $x$ is in the null space of $EA$, so that $(EA)x=\vec 0$. As... | {
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"lm_q2_score": 0.870597270087091,
"openwebmath_perplexity": 79.41043329591068,
"openwebmath_score": 0.949213981628418,
"tags"... |
c++, c++11, queue, serialization
Title: Serializable Queue header only library I was hoping someone could check the library I 'm working on to see if they could give any suggestions. My biggest issue right now is getting tuple to work with more than just the basic types and I also wanted to add exception safety; is th... | {
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"tags": "c++, c++11, queue, serialization",
"url": null
} |
dimensional-analysis
The strengths and limitations of the method are stated in the wikipedia article : | {
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gauge-theory, representation-theory, quantum-chromodynamics, lie-algebra, yang-mills
$$
which states that the tensor product of the fundamental and the anti-fundamental (conjugate fundamental) representation decomposes into the adjoint representation and the trivial representation.
More precisely, the 9 basis vectors ... | {
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c++, promise, template-meta-programming, c++17
Title: `std::move_as_tuple` and `std::when_all` Working with futures and .then, I keep running into the problem of needing to "capture by move" in a lambda. In fact, not only that, but when implementing e.g. when_all, I find myself needing to capture a whole parameter-pac... | {
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"openwebmath_score": null,
"tags": "c++, promise, template-meta-programming, c++17",
"url": null
} |
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