text stringlengths 1 1.11k | source dict |
|---|---|
c, linked-list
free(node);
return data;
error:
return NULL;
}
struct FindResult *LLFindNode(LinkedList *ll, LinkedListNode *node) {
struct LLFindNodeBaseParams fnbParams = {
.ll = ll,
.node = node
};
struct FindResult *res = FindNodeBase(&fnbParams);
return res;
}
LinkedList... | {
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"tags": "c, linked-list",
"url": null
} |
general-relativity, special-relativity, energy-conservation, geodesics
Further remark
Components of 4-vectors (or higher rank tensors) are always frame-dependent. In SR this fact does not perturb our physical intuition too much. This is because the components correspond closely to what some inertial observer will obse... | {
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"tags": "general-relativity, special-relativity, energy-conservation, geodesics",
"url": ... |
java, performance, beginner, parsing
if(datePattern != null){
return stringToDate(valueAsString, datePattern);
}else{
// value is a String... nothing else to do!
return valueAsString;
}
}
}
} | {
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"openwebmath_score": null,
"tags": "java, performance, beginner, parsing",
"url": null
} |
thermodynamics, statistical-mechanics, entropy
So, What is meant by "Entropy"? And why is $ΔS=\frac{q_{rev}}{T}$? And what is up with this thing called "Disorder"? "Measurement of Disorder" is not a particularly good metaphor for entropy. Your title suggestion is closer to a sounder notion: in these terms I would call... | {
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"tags": "thermodynamics, statistical-mechanics, entropy",
"url": null
} |
statistical-mechanics, correlation-functions, ising-model, mean-field-theory
Part 1 (b) :
Given that the above relation is an equivalent definition of MFT for a spin model, is it true to say that :
"Mean-field theory is equivalent to taking out any spatial spin correlations of our system."
?
I think this follows from ... | {
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"tags": "statistical-mechanics, correlation-functions, ising-model, mean-field-theory",
"u... |
machine-learning, deep-learning, gradient-descent
Title: Why does gradient descent gives me much better Relative Squared Error then the Least Squares approach? Am I doing regression task with 7 dependent variables and 10000 data points. The SGD gives me 22% of mean absolute percentage error on test and train dataset. ... | {
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"openwebmath_score": null,
"tags": "machine-learning, deep-learning, gradient-descent",
"url": null
} |
ros-melodic
collect2: error: ld returned 1 exit status
display/CMakeFiles/DisplayNode_sub.dir/build.make:115: recipe for target '/home/hojjat/projects/shared_printer/devel/lib/display/DisplayNode_sub' failed
make[2]: *** [/home/hojjat/projects/shared_printer/devel/lib/display/DisplayNode_sub] Error 1
CMakeFiles/Makefi... | {
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"openwebmath_score": null,
"tags": "ros-melodic",
"url": null
} |
ros, turtlebot
Originally posted by underactuated on ROS Answers with karma: 18 on 2017-07-24
Post score: 0 | {
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"tags": "ros, turtlebot",
"url": null
} |
python, python-3.x, postgresql, cryptocurrency
and can be replaced with a simplistic collections.namedtuple. But, the whole declaration can be removed, because of next point.
Instead of using print statements, make use of the logging module. It has some helper packages (on PyPI), or you can write your own for coloure... | {
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"tags": "python, python-3.x, postgresql, cryptocurrency",
"url": null
} |
c#, sql-server, asp.net, ado.net
<h2>Neck Pickup: </h2><p>{10}</p>
<br/>
<h2>Bridge Pickup: </h2><p>{11}</p>
<br/>
<h2>Hardware Color: </h2><p>{12}</p>
<br/>
... | {
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"tags": "c#, sql-server, asp.net, ado.net",
"url": null
} |
homework-and-exercises, newtonian-mechanics, mass, rotational-dynamics, spring
$\frac 1\mu=\frac1m + \frac 1I=\frac1m + \frac 2{ma^2}$
which leads to:
$\mu=\frac{a^2}{a^2+2}m$
Given that the radius is irrelevant in the derivation for the first part, I'm assuming I've forgotten something or misapplied something else, s... | {
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"tags": "homework-and-exercises, newtonian-mechanics, mass, rotational-dynamics, spring",
... |
electromagnetism, electrostatics, electromagnetic-induction
Title: Can an electric scalar potential still be defined through Faraday's Law when the change in flux is due to an expanding circuit loop? When a magnetic field is time-varying, then Faraday's Law can be used to define a conservative field with which a scala... | {
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "electromagnetism, electrostatics, electromagnetic-induction",
"url": null
} |
lagrangian-formalism, gauge-theory, field-theory, maxwell-equations
Title: How to obtain Maxwell's Lagrangian from complex scalar fields? I've looked in several books and they all show how to obtain electrical interactions by forcing local gauge invariance of any complex scalar field Lagrangian (like Klein-Gordon or D... | {
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"tags": "lagrangian-formalism, gauge-theory, field-theory, maxwell-equations",
"url": nul... |
c++, memory-management, vectors
I think you should throw these constructors out. This is getting a bit too clever for a dumb vector.
Also, you’re opening the door for some MASSIVE confusion when the student discovers that dumb::vector(1, 2) is not the same as dumb::vector{1, 2}.
vector(const std::initializer_list<valu... | {
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"tags": "c++, memory-management, vectors",
"url": null
} |
quantum-gate, quantum-state, terminology-and-notation
By definition, the input $\vert x \rangle$ and the output $\vert x \rangle$ on the data register of $\text{CNOT}$ are the same. As shown above, this is not in contradiction with $\vert \psi_2 \rangle = \vert -- \rangle$.
The notation is agnostic to orthonormality ... | {
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} |
causality
But isn't it always the case, that for same inputs we're getting same outputs except for the case of time-variance, which this sentence is not about? Consider, for example, a moving average window. At any time $n$ the output $y[n]$ will equal the average $\frac{x[n-1]+x[n]+x[n+1]}{3}$. Now let us choose:
$$x... | {
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"openwebmath_score": null,
"tags": "causality",
"url": null
} |
rosjava
at java.lang.Thread.run(Thread.java:636)
Caused by: java.net.SocketException: Network is unreachable
at sun.nio.ch.Net.connect(Native Method)
at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:525)
at org.jboss.netty.channel.socket.nio.NioClientSocketPipelineSink.connect(NioClientSocket... | {
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"tags": "rosjava",
"url": null
} |
approximation, data-compression
Suppose you are Seurat, the pointillist, and you have a budget of 100 brushstrokes with which to express a monochromatic landscape. In addition to (x, y) information we can also give each stroke a radius r, for big blobs or fine dots. This is not too far away from a wavelet representati... | {
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"tags": "approximation, data-compression",
"url": null
} |
27. anonymous
tbh idk
28. jigglypuff314
I suggest you open another question to ask this someone else deciphering this weirdly phrased english confuses me every time and I would feel bad if I gave you a wrong answer :3
29. anonymous
okay ill skip that one for now
30. anonymous
Which of the following represents $3... | {
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"lm_q1_score": 0.9833429580381724,
"lm_q1q2_score": 0.8151311418851962,
"lm_q2_score": 0.8289388104343893,
"openwebmath_perplexity": 2112.1598763818724,
"openwebmath_score": 0.6594314575195312,
"tags":... |
organic-chemistry, structural-formula, stereochemistry
Title: Inversion of Configuration - Opening of Epoxide This doesn't look like a traditional inversion of configuration: | {
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"url": null
} |
ros, gazebo, gazebo-worlds
Comment by Amal on 2013-04-26:
so what I have to do now >:o
I assume the question to be: "What values do we add to a robot by building a world in gazebo simulator, like the one here ?"
Answer: If you build a world like that one, a cup on top of a table, in gazebo, you could write and verify... | {
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visible-light
Looking for more information, however, I was a little disappointed, since nothing seemed to give a graph of lumens emitted over time for all different kinds of bulbs. Of course, there isn't just one relevant time scale. A light could flicker with 60 Hz and also flicker with 2000 Hz (I just made that up... | {
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"tags": "visible-light",
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} |
python, beginner, game, python-3.x
if game_Over_Alert():
all_Off()
play_Game()
play_Game()
view.close() Here are some general tips and guidelines:
Do read the PEP8 guide – Loads of good information in that one
Use docstring, not comments for functions – Docstrings will possibly show up in your IDE w... | {
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"tags": "python, beginner, game, python-3.x",
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c#, xunit
public enum TransactionTypeEnum
{
Deposit, Withdraw, ThirdPartyTransfer
}
} Is your mock ATM class literally named _atm?! Or is it a non-static class that you have assigned to an instance named _atm? Either way, I don't like it and find the _atm class to be useless in your limited example.
... | {
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programming-challenge, time-limit-exceeded, swift, collatz-sequence
creates the Collatz sequence starting at 13. But in contrast to your
function, all elements are evaluated lazily, i.e. on demand when
the sequence is enumerated.
for n in seq { print(n) }
would print that Collatz sequence. But we need only the length... | {
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"tags": "programming-challenge, time-limit-exceeded, swift, collatz-sequence",
"url": ... |
songoku
No. The sample variance for the t test is not the same as the population variance for the z test.
So I can say that the factor to choose between z - test or t - test is whether the population variance is known or not? If population variance is known, I use z - test and if not, I use t - test, independent of the... | {
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"lm_q2_score": 0.8499711794579723,
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"openwebmath_score": 0.8351411819458008,
"tag... |
### Code(Python):
class Solution:
# @return an integer
def uniquePaths(self, m, n):
#define map and initialization
mp = [[0 for i in xrange(n)] for i in xrange(m)]
for i in xrange(m):
mp[i][0]=1
for j in xrange(n):
mp[0][j]=1
for i in xrange(1,m):
for j in xrange(1,n):
mp[i][j]=mp[i-1][j]+mp[i][j-1]
return mp[m-1][n... | {
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"lm_q1_score": 0.9780517507633985,
"lm_q1q2_score": 0.8582177066839761,
"lm_q2_score": 0.8774767858797979,
"openwebmath_perplexity": 2527.0851145767156,
"openwebmath_score": 0.3533759117126465,
"tags": ... |
You solved the first part correctly. You have $(I-A)^2=(I-A)(I-A)=I-2A+A^2$. If you know that $A^2=A$, you get $(I-A)^2=(I-A)(I-A)=I-2A+A^2=I-A$.
If $X$ is an $n\times n$-matrix, then the inverse of $X$ is a $n\times n$-matrix $Y$ such that $$XY=YX=I$$ and it is denoted by $X^{-1}$.
Not every matrix must have an inve... | {
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"lm_q1_score": 0.9883127420043056,
"lm_q1q2_score": 0.8148262313980967,
"lm_q2_score": 0.8244619306896955,
"openwebmath_perplexity": 114.13928635154576,
"openwebmath_score": 0.9749341607093811,
"ta... |
javascript, cryptography, integer
new Error("The exponent "+t.toString()+" is too large.");if(this.isSmall&&a(i=Math.pow(n,r)))return new u(p(i));s=this,o=G[1];for(;;){r&!0&&(o=o.times(s),--r);if(r===0)break;r/=2,s=s.square()}return o},u.prototype.pow=o.prototype.pow,o.prototype.modPow=function(e,t){e=Q(e),t=Q(t);if(t... | {
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"openwebmath_score": null,
"tags": "javascript, cryptography, integer",
"url": null
} |
• ### that the scattering angle of the photon is twice the 2. A 0.700-MeV photon scatters off...
that the scattering angle of the photon is twice the 2. A 0.700-MeV photon scatters off a free electron such that the scattering angre scattering angle of the electron, as shown in the figure below. a. Determine the scatte... | {
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"lm_q1_score": 0.9553191348157373,
"lm_q1q2_score": 0.8061891448735801,
"lm_q2_score": 0.8438951084436077,
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"openwebmath_score": 0.8567330837249756,
"tags"... |
AaBbCcDd EeFfGgHh IiJjKkLl MmNnOoPp
AaEeIiMm BbFfJjNn CcGgKkOo DdHhLlPp
AaFfKkPp BbEeLlOo CcHhIiNn DdGgJjMm
AaGgLlNn BbHhKkMm CcEeJjPp DdFfIiOo
AaHhJjOo BbGgIiPp CcFfLlMm DdEeKkNn
Here is this solution in unhelpful picture format, just for fun.
To go from this to a soluti... | {
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"lm_q1q2_score": 0.8010778229795923,
"lm_q2_score": 0.8128673087708699,
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"openwebmath_score": 0.8795148134231567,
"tags... |
I do not write the proofs of these equations, since they all involve $b$ being a perfect square and taking the factoring of a difference of squares. Note that if $b$ is a perfect square, $P(a,b)$ is necessarily finite (but possibly empty) due to this factoring.
As I find likely solutions for greater $n$, I will update... | {
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"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9877587229064297,
"lm_q1q2_score": 0.8231236380319216,
"lm_q2_score": 0.8333245953120233,
"openwebmath_perplexity": 131.77835917948073,
"openwebmath_score": 0.9686526656150818,
"ta... |
c++, linked-list, homework
A lot of the user interface code could be spint into functions.
case AddContact:
std::cout << "\nEnter the contacts' first name: ";
std::cin >> firstName;
std::cout << "\nEnter the contacts' last name: ";
std::cin >> lastName;
std::cout << "\nEnter... | {
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"openwebmath_score": null,
"tags": "c++, linked-list, homework",
"url": null
} |
# an exam has 50 multiple choice questions with 5 options
An exam has 50 multiple choice questions. Each question has five answer options and each question has 2 grades A-. Assuming that "a student" has no prior knowledge and randomly guess on all questions exam,
1. Compute the expected mean for the student score
2. ... | {
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"lm_q2_score": 0.865224070413529,
"openwebmath_perplexity": 627.6381328677032,
"openwebmath_score": 0.7624414563179016,
"tags... |
bash
.env:
KIBANA_PASS=some_supersecure_kibana_pass
ES_PASS=some_supersecure_elasticsearch_pass
other files:
docker-compose.yml
create-certs.yml
update:
I have fixed the substitution lines. They now read:
cat es_passes.txt | grep 'PASSWORD kibana' | awk '{print $4}' | xargs -I {} sed -r -i 's/^KIBANA_PASS=.*$/KIBA... | {
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"openwebmath_score": null,
"tags": "bash",
"url": null
} |
ros-kinetic, debian
Ign http://packages.ros.org jessie/main Translation-en_IN
Ign http://packages.ros.org jessie/main Translation-en
Hit http://security.debian.org jessie/updates/non-free ... | {
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"tags": "ros-kinetic, debian",
"url": null
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homework-and-exercises, electrostatics
Title: Charge and Sign of a pith ball Could really use some help on this question. I don’t even know where to start. Well do you know about forces, acceleration and mass? Clue: $F = ma$
Do you know how to get the force on a charged object in an electric field? Clue: $F = Eq$
This... | {
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"tags": "homework-and-exercises, electrostatics",
"url": null
} |
java, strings, playing-cards
The whole class is here:
public class CardNumber {
private final String name;
private final int value; | {
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python, programming-challenge, time-limit-exceeded, pathfinding
def answer(maze):
...
while q:
...
for next in adjacent_to((dims, curr)):
...
Here I had to remove the generator from adjacent_to as well, because it messes with the caching.
This solves the medium maze with 28616 func... | {
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"url": null... |
electrostatics, electromagnetic-induction
This is unintuitive for me, because the positive charge isn't even connected to the conductor. I initially thought that grounding sets $V_{\text{conductor}}$ to zero instead.
Could someone clarify this and point out any misconceptions I may have? Thanks! There cannot be a pote... | {
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In addition to including only "as" in the argument of either \mbox or \text and supplying a missing & symbol immediately before 14038, do consider switching to an alignat* environment and aligning the material on the = symbols.
\documentclass{article}
\usepackage{amsmath} % for 'alignat*' env. and '\text' macro
\begin... | {
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"tag... |
navigation, ros-melodic, amcl
Originally posted by JackB with karma: 977 on 2020-10-15
This answer was ACCEPTED on the original site
Post score: 1 | {
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"tags": "navigation, ros-melodic, amcl",
"url": null
} |
compilers, data-flow-analysis
Real compilers like gcc or llvm perform both kind of analysis and there are even optimizations that require both kind of analysis simultaneously:
Partial redundancy elimination is one of those forward- and backward-analysis requiring algorithms: It tries to move code to the latest-necesar... | {
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"tags": "compilers, data-flow-analysis",
"url": null
} |
c#, object-oriented
// Accidentally
SetToken(...) //without guard expression
The compiler will not notify the caller of the SetToken that you should call the IsNotEmpty if you want to call SetToken.
So, it is advisable to move your guard expression into the to be called method. If you want to expose it that's fine b... | {
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deep-learning, lstm
I have two questions here:
1). How to reshape properly? My vocab size is 359 which I imagined (obviously wrong) to be the number of the features. --> input = (274, 95, 359). This is not possible since an array of 274*95 = 26030 can't be reshaped into (274, 95, 359).
If I take the number of diffrent... | {
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"url": null
} |
signal-analysis, audio, speech-processing, speech-recognition
SoX is a cross-platform (Windows, Linux, MacOS X, etc.) command line
utility that can convert various formats of computer audio files in to
other formats. It can also apply various effects to these sound files,
and, as an added bonus, SoX can play and... | {
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"tags": "signal-analysis, audio, speech-processing, speech-recognition",
"url": null
} |
beginner, php, security, static, network-file-transfer
/**
* Set a max. height and Width of image
* @var
*/
static $allowedFileDimensions;
/**
* Max file size to upload. Must be less than server/browser
* MAX_FILE_UPLOAD directives
* @var
*/
static $allowedMaxFileSize;
... | {
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"tags": "beginner, php, security, static, network-file-transfer",
"url": null
} |
classical-mechanics, angular-momentum, rotational-dynamics, torque, rotational-kinematics
$$\mathbf{\text{EDIT II}}$$
$$\mathbf{\text{Definition :}}\text{ A collection of $N$ particles is called a rigid collection if and only if}$$
$$|\mathbf{r}_i-\mathbf{r}_j|=c_{ij} \text{ (some constant that doesn't vary with time)... | {
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"tags": "classical-mechanics, angular-momentum, rotational-dynamics, torque, rotational-kin... |
ros, planning-environment, arm-navigation
and the arm does not move. It doesn't matter how I initially position the arm, the goal attempt always fails with the same error. My Dynamixel controller node publishes a valid set of joint positions on the /joint_states topic as I can verify in RViz.
UPDATE: After more test... | {
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ethology, behaviour, intelligence
(Photo from below article, copyright)
Behind a paywall is:
Crocodilians use tools for hunting.
V. Dinets, J.C. Brueggen & J.D. Brueggen
Published online: 29 Nov 2013
https://doi.org/10.1080/03949370.2013.858276
It is also known that Crocodylus porosus caches uneaten food; and unproven... | {
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java, server, properties, configuration
private int eventServerPort;
private int clientServerPort;
and the initialization of those 2 variables done in the constructor. The purpose of doing this in the constructor, instead of a static initializer, is that it lets you have proper instance fields.
The first concern is t... | {
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"tags": "java, server, properties, configuration",
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inorganic-chemistry, redox, coordination-compounds, molecular-structure, halides
Title: How can AuCl3 exist? The reduction potential for $\ce{Au^3+ + 3e- -> Au}$ is $1.503 \text{ V}$. The reduction potential of $\ce{Cl2 + 2e- -> 2Cl-}$ is $1.36 \text{ V}$. So, the $E^o$ for $\ce{2Au^3+ + 6Cl- -> 2Au + 3Cl2}$ is $0.143... | {
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"tags": "inorganic-chemistry, redox, coordination-compounds, molecular-structure, halides... |
will be. Certain personality traits and cognitive domains of executive functions (EF) are differentially related to attention deficit hyperactivity disorder (ADHD) symptoms in adolescents. To evaluate systems with an initial condition, the full Laplace domain equations for differentiation and integration. Derivatives a... | {
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"openwebmath_score": 0.7458417415618896,
... |
javascript, game, canvas
Title: Efficient way to calculate game time It's a common occurrence nowadays to have different refresh rates across different devices. That's why it's very important to keep track of the device's frame rate to keep the game time consistent across different refresh rates.
Is this an efficient ... | {
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"tags": "javascript, game, canvas",
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} |
wave-particle-duality
In fact you do not know what it is until you observe it, and if it is one event, you can only pull your beard and wonder at its trajectory as a single particle. By accumulating events you observe the wave nature in the distribution.
This insight allowed to describe mathematically the microcosm w... | {
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(2.9). By above, we know that f has a left inverse and a right inverse. See the lecture notesfor the relevant definitions. This same quadratic function, as seen in Example 1, has a restriction on its domain which is x \ge 0.After plotting the function in xy-axis, I can see that the graph is a parabola cut in half for a... | {
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"openwebmath_score": 0.913962006568908... |
c#, task-parallel-library
Title: Avoid while(true) in task scheduling code I am writing a task scheduler (that will one day grow up to be a windows service when I look into them) that should pretty much loop infinitely until I tell the program to stop. But having while(true) seems incorrect. What is the correct way to... | {
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quantum-field-theory, renormalization, feynman-diagrams, regularization, wick-rotation
In the first method, you integrate $\int_{-\infty}^\infty dk^0 \int^\Lambda d^3k$, but in the second calculation you integrate $\int^\Lambda d^4 k_E$. | {
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homework-and-exercises, newtonian-mechanics, energy, conservation-laws, collision
Title: Two objects of equal and opposite velocities collide elastically. If the two objects have different masses, which one has a bigger final speed? Question: Two objects, one less massive than the other, collide elastically and bounce... | {
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"tags": "homework-and-exercises, newtonian-mechanics, energy, conservation-laws, collision"... |
quantum-mechanics, homework-and-exercises, atomic-physics
Title: Collapse of wavefunction in hydrogen atom under measurement of $L^2$ If a hydrogen atom is in the state $\Psi = \frac{1}{\sqrt{3}}(\psi_{100} + \psi_{211}+\psi_{21-1})$
and the square of the angular momenta was measured to be $2\hbar^2$. After the measur... | {
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"tags": "quantum-mechanics, homework-and-exercises, atomic-physics",
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} |
velocity, dimensional-analysis
Title: Why is meters/second the same as meters per second? In quantities such as speed where the derived (SI) unit is m/s, why do we pronounce it and interpret it as meters per second? My guess is that 1 m is associated with 1 second. Similarly, 5 m/s is pronounced and interpreted as 5 m... | {
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c++, template, calculator
Or shorter:
auto add() const {
return number1 + number2;
}
Putting it all together:
template <class T1, class T2>
class Calculator {
T1 number1;
T2 number2;
public:
template <class T3, class T4, class = decltype(T1(std::declval<T3&&>()),
T2(std::declval<T4&&>()), void... | {
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can anyone explain how u arrive at this solution?
0
@gabbar how to take a sequence.........its why only 10 number??
0
In context of question it is 10 head at 180??
0
Answer should be 10. I think that the "head" should not be included in the request set.
Even in the first part of this question, 180th track which was t... | {
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"openwebmath_score": 0.4586324989795685,
"tags"... |
algorithms, graphs
Title: Suppose G is simple graph with n vertices. Prove that G has twice as many edges as vertices only if $n\geq 5$ I just didn't understand the second part of the prove
"G has twice as many edges as vertices only "... what do I actually have to prove ?
I understand it like $n=2e$ , is it right ?
t... | {
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python, primes, hash-map
def __getitem__(self,key):
key = int(key)
if key>= self.previous_max:
self.__find_primes((key+1))
try:
return super(PrimeDict,self).__getitem__(key)
except:
return False
https://gist.github.com/aausch/6709819
Is there any way... | {
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} |
newtonian-mechanics, rotational-dynamics, rotational-kinematics, rotation
So this means that more the moment of inertia more the “grip” on the road (which is favoured in wheels).
No. Notice that none of your analysis has taken into account the material properties between the two surfaces. What you are essentially doi... | {
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"url... |
parsing, datetime, rust, configuration, scheduled-tasks
pub fn new_with_wrap_around(min: u8, max: u8) -> DateTimeFieldParser {
DateTimeFieldParser {
range: min..=max,
wrap_around_at_end: true,
}
}
pub fn parse_field(&self, string_value: &str) -> Vec<u8> {
let mu... | {
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java, concurrency, guava, bitcoin
import javax.annotation.ParametersAreNonnullByDefault;
import static java.util.concurrent.TimeUnit.NANOSECONDS;
import static java.util.concurrent.TimeUnit.MINUTES;
class Vanitas {
private static final Logger log = Logger.getLogger(Vanitas.class);
private static final Networ... | {
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newtonian-mechanics, everyday-life, speed
This rotation is opposed by the static friction of the tire. As you continue turning, portions of the tread on the contact patch are pulled over and stressed.
Now imagine holding the steering wheel at that angle and allowing the car to roll forward a bit. The tread at the re... | {
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shown in Figure 2. Here's what they look like: The Cartesian Laplacian looks pretty straight forward. 9: Cylindrical and Spherical Coordinates In the cylindrical coordinate system, a point Pin space is represented by the ordered triple (r; ;z), where rand are polar coordinates of the projection of Ponto the xy-plane an... | {
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"lm_q2_score": 0.8757869803008764,
"openwebmath_perplexity": 535.9419383625223,
"openwebmath_score": 0.931949257850... |
ros, husky, ros-indigo
Originally posted by stevensu1838 on ROS Answers with karma: 27 on 2019-12-02
Post score: 0
Edit: I just noticed that link to the Husky Dual Arm manipulation demo, not the general Husky + UR5 page.
The dual arm manipulation demo page asks you to git clone https://github.com/DualUR5Husky/univers... | {
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filters, frequency-response, biquad
Where am i wrong? Not exactly what you're asking but the frequency (and phase) response of that SVF is identical to a biquad filter whose coefficients were calculated using the bilinear Z-transform. | {
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arduino, rosserial
Originally posted by tonybaltovski with karma: 2549 on 2015-03-09
This answer was ACCEPTED on the original site
Post score: 1
Original comments
Comment by Wes G on 2015-03-09:
That's great, I'll have to look into that more.
Comment by Wes G on 2015-03-10:
Marking this question the answer, because i... | {
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"tags": "arduino, rosserial",
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inorganic-chemistry, decomposition
I looked up the answer and it was given to be silver nitrate, and I took it up as something to be remembered. However, when I checked online for the decomposition of other options such as ferric nitrate I found many research papers discussing the same which is not something one asks ... | {
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quantum-mechanics, waves, wavefunction, schroedinger-equation, integration
P. S. (a joke, but also quite not). Never ever read the book by Landau and Lifshitz if you want to derive something. After many and many years of physics and mathematics in all possible flavours I am still unable to understand any single line t... | {
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"ur... |
special-relativity, loop-quantum-gravity
Not at all – if you're saying this, you're probably not familiar with the mathematics of LQG. LQG is background-independent pretty much by construction. Also, background independence doesn't just mean that there's no preferred inertial frame of reference aka ether, the idea goe... | {
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"tags": "special-relativity, loop-quantum-gravity",
"url": null
} |
cc.complexity-theory
Title: Example of a problem in $P^{PP}$? Can someone provide an example of (possibly complete) natural problems in the class $P^{PP}$?
we know that MAJSAT is a $PP$ complete problem which is defined as: Given a Boolean formula F. The answer must be YES if more than half of all assignments $x_1$, $... | {
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acid-base, ions
Can someone help me with this and possibly give me hints at solving the rest? Your approach thus far is correct. $\ce{Fe^3+}$ is acidic; $\ce{Fe(OH)3}$ is not a strong base. Indeed, if $\ce{Fe(OH)3}$ were a strong base, it would dissociate and form $\ce{Fe^3+}$, but, as you've mentioned, the opposite p... | {
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"tags": "acid-base, ions",
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image-processing, real-time, deep-learning
• if, or to the extent that,
• its actions are manifest to action observers with latencies that can be related (usually in an application-specific way) to the actions’ perceived currencies—
• i.e., in a time frame that those actions’ latencies and predictability of late... | {
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"tags": "image-processing, real-time, deep-learning",
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catkin, make
Original comments
Comment by wjch on 2016-03-12:
Thanks for your attention, so,as you said ,I have added "find_package(catkin REQUIRED COMPONENTS roscpp)" into the txt,but it's the same error,help me please!
Comment by wjch on 2016-03-12:
this is my txt:
cmake_minimum_required(VERSION 2.8.3)
project(exam1... | {
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javascript, object-oriented, design-patterns, modules
this.attr({
cursor: "pointer"
});
}).attr({
opacity: 0,
stroke: "#e60028",
"stroke-dasharray": option[0]
}).animate(loadCube.delay(1000)); | {
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"tags": "javascript, object-oriented, design-patterns, modules",
"url": null
} |
navigation, exploration, turtlebot, gmapping, explore
/robot_state_publisher
/mobile_base_nodelet_manager
/robot_pose_ekf
/slam_gmapping
/camera/camera_nodelet_manager
/move_base
/move_base
Outbound:
/rviz_1370012116847082561
/move_base
/rosout
/rviz_1370... | {
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"tags": "navigation, exploration, turtlebot, gmapping, explore",
"url": null
} |
homework-and-exercises, newtonian-mechanics, oscillators, angular-velocity
Title: A particle subject to a potential of the form $V(x)=V_0\vert x \vert$ A particle is moving in a potential $V(x)=V_0\vert x \vert$. I need to get the angular frequency and the period of the movement of the particle.
This is what i have do... | {
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"ur... |
c#, algorithm, datetime
This is how I implemented the method:
// ActiveItems() method (although it's bad naming) retrieves all the currently active hotels/transfers etc from a booking.
var items = booking.ActiveItems(); // each item has check-in and/or check-out dates, internals doesn't matter for this problem
var ... | {
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of X in degrees. Or in a simpler form, the arctan function can be used to calculate the angle of a slope by dividing the rise by the run measurement. example. The trigonometric functions in MATLAB ® calculate standard trigonometric values in radians or degrees, hyperbolic trigonometric values in radians, and inverse va... | {
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"lm_q1q2_score": 0.8145006956387153,
"lm_q2_score": 0.8311430394931456,
"openwebmath_perplexity": 977.7343932663177,
"openwebmath_score": 0.6621477007865906,
"tags": null,
... |
c++, strings, reinventing-the-wheel
// allocate a given size of memory
char* str_alc(int size);
private:
int size;
char* str;
};
So as you can see, it's not really anything special, just some basic functions that should be enough for my project. A few comments on the code:
I chose to add a get() method i... | {
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"tags": "c++, strings, reinventing-the-wheel",
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sdformat
Title: Insert sdf at coordinates
Hello,
Is it possible to insert an sdf file at specific coordinates in Gazebo? For instance the origin? All I can seem to do is select my model from the insert tab and then manually place it in the viewport.
I'm new to Gazebo so my understanding of how to properly use it is s... | {
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immunology, coronavirus, vaccination, lymphatic-system, covid
I found one publication that shows reduced risk for infection by influenza in patients who already had SARS-CoV-2, though this is attributed to pathogenic competition.4 Considering total pathogen dosage, it is logical to me that challenge with two pathogens... | {
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"tags": "immunology, coronavirus, vaccination, lymphatic-system, covid",
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special-relativity, reference-frames, coordinate-systems, inertial-frames, observers
postscript:
So, geometrically, this relates these two segments bounded by a pair of parallel lines in terms of the Minkowski-angle between the segments
and a Minkowski angle from one segment to the Minkowski-perpendicular segment.
One... | {
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The probability of $D_b$ is $1-(6/7)^5$, so in the long run $D_b$ occurs in that fraction of all $5$-ticket draws. Similarly, $D_r$ occurs in the fraction $1-(5/7)^5$ of all $5$-ticket draws. If I make $n$ $5$-ticket draws, I expect $D_b$ and $D_w$ each to occur about $(1-(6/7)^5)n$ times, $D_r$ to occur about $(1-(5/7... | {
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"lm_q1q2_score": 0.8108852094019442,
"lm_q2_score": 0.8198933293122506,
"openwebmath_perplexity": 132.67237961818725,
"openwebmath_score": 0.8568284511566162,
"ta... |
javascript, jquery, asp.net, validation
Title: Check whether all textboxes are filled I'm doing some simple validations using jQuery to check if all textboxes are filled.
$(document).ready(function () {
$("#<%= btnInsertCountry.ClientID %>").click(function () {
var codeValue = $("#<%= txtCountryCode.ClientID %>").... | {
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newtonian-mechanics, kinematics, rotation
So the point is: $v=\omega r$ in this case is the equivalent of not moving in the non-rotating case.
By the way you can at once compute the necessary friction if the body is not a cylinder but a sphere: then torque and force have to be at the ratio 2:5, you need a friction fo... | {
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# Probability of meeting - a confusion
This is a basic probability question.
Persons A and B decide to arrive and meet sometime between 7 and 8 pm. Whoever arrives first will wait for ten minutes for the other person. If the other person doesn't turn up inside ten minutes, then the person waiting will leave. What is ... | {
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"lm_q1_score": 0.989510906574819,
"lm_q1q2_score": 0.8579413271157709,
"lm_q2_score": 0.8670357460591569,
"openwebmath_perplexity": 154.8414077831596,
"openwebmath_score": 0.703490138053894,
"tags"... |
method calculator - Solve the Linear programming problem using Simplex method, step-by-step We use cookies to improve your experience on our site and to show you relevant advertising. This calculator solves arbitrary equations step-by-step. duction to linear programming, presenting through practical examples the possib... | {
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"lm_q1_score": 0.9759464485047916,
"lm_q1q2_score": 0.8174722323678324,
"lm_q2_score": 0.8376199673867852,
"openwebmath_perplexity": 808.1264268448064,
"openwebmath_score": 0.39217397570610046,... |
vba, excel
becomes
projectSheet.cells(x,1) =
That would simplify your code a lot. But if we want to address the speed, we're going to have to use some arrays..
Arrays
First you need to decide if you want the formulas written, or you want the data written. If it's the formula, stop unneeded rewriting of it.
If you'd ... | {
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Adding up the digits like this is sometimes called "casting out 9's" and can be used to check arithmetic. The sum of numbers with remainders r and s will have a remainder of r+s (or r+s-9), so the sum of digits of the inputs, reduced as far as they will go, should match the sum of digits of the result, similarly reduce... | {
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"lm_q1_score": 0.9697854164256365,
"lm_q1q2_score": 0.808146031653765,
"lm_q2_score": 0.8333245870332531,
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"openwebmath_score": 0.5505184531211853,
"tags": ... |
Help me make my explanation better by providing a logical feedback.
If you liked the post, HIT KUDOS !!
Don't quit.............Do it.
Manager
Joined: 06 Dec 2016
Posts: 245
Re: If n is the product of 3 consecutive integers, which of the following [#permalink]
### Show Tags
11 Apr 2017, 18:40
Something you all nee... | {
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"openwebmath_score": 0.5774070024490356,
"tags": ... |
computational-geometry
To find optimal solution also rotation would be needed, or different approach.
If you decide that not rotated version is sufficient, the ray casting algorithm (also known as scanline test) for testing point inside polygon would be very effective, because all points in a row form line, so in one ... | {
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"tags": "computational-geometry",
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natural-selection
Title: What's the difference between stabilizing selection and balancing selection? I came across these terms in Darwin's "Origin of Species" and I wasn't sure what the difference is. Usual meaning
Usually, Stabilizing selection is a concept that applies to a phenotypic trait while balancing selectio... | {
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homework-and-exercises, mathematical-physics, operators, hilbert-space, fourier-transform
$$x = e^{ik} + e^{-ik} - 2 = 2(\cos(k) - 1) \leq 0 . $$
If the question is whether $g\ge 0$ then the answer is "no" in the sense that it's eigenvalues are non-positive as we have just showed.
A bit of intuition
We recognize
$$\ph... | {
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