text stringlengths 1 1.11k | source dict |
|---|---|
rosmake
Then, I rebooted, re-installed ROS, and everything is fine again.
Originally posted by Benoit Larochelle with karma: 867 on 2012-09-18
This answer was ACCEPTED on the original site
Post score: 1
Original comments
Comment by anonymous2054 on 2013-01-14:
Same thing happened to me with a fresh install of groovy... | {
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"url": null
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python, email
return wanted
def sanitize(msg):
"""
Given an RFC-2822 message `msg`, generate its 'sanitized' version.
* `msg`: The message to be sanitized.
* Returns a sanitized version of `msg`.
`sanitize` tries to be moderately conservative and only act when things
are moderately safe:
... | {
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"openwebmath_score": null,
"tags": "python, email",
"url": null
} |
statistical-mechanics, supersymmetry, symmetry-breaking
The reason for $\Delta=1 $ is that in the paper you cite, one builds all the states in the Fock space on one bosonic vacuum state. This one bosonic vacuum state is what the index is counting. | {
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"tags": "statistical-mechanics, supersymmetry, symmetry-breaking",
"url": null
} |
c++, console, windows, game-of-life
Why are we using different characters for input than the ones we use for output? If we make input and output formats compatible, it's probably to our advantage.
file.close();
Since we're not checking the status of file after closing, we can omit this and just let the destructor d... | {
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"tags": "c++, console, windows, game-of-life",
"url": null
} |
rosmake
Install colorgcc by sudo apt-get install colorgcc
Define a directory where you will have executables in your path, e.g. $HOME/bin (create bin in your home directory)
3. Add this directory to your path, i.e. `export PATH=$HOME/bin:$PATH`. Prefereably put that line in your .bashrc or similar, so you only have to... | {
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"tags": "rosmake",
"url": null
} |
imu, navigation, ekf, gps, robot-localization
0, 0, 0, 0, 0, 1e-9, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 1e-9, 0, 0, 0, 0, 0, 0, 0, 0,
... | {
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"openwebmath_score": null,
"tags": "imu, navigation, ekf, gps, robot-localization",
"url": null
} |
sql, sql-server, t-sql
AND
COUNT(CASE WHEN [IS_NO_LONGER_GOOD_BOY] = 1 THEN 1 END) = 0
) AS [DOG_SKILL_PAIRS]
WHERE
[DOG_SKILL_PAIRS].[ID] = [DOGS_OUT].[ID]
AND
[DOG_SKILL_PAIRS].[SKILL_NAME] = [DOGS_OUT].[SKILL_NAME]
) | {
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"openwebmath_score": null,
"tags": "sql, sql-server, t-sql",
"url": null
} |
information-theory, entropy, min-entropy
$$-\inf_x f(x) = \sup_x[-f(x)] =
\sup_x [-\inf\{y\in\mathbb{R}:\,\, y\in g(x)\}] \\
= \sup_x \sup\{-y: \,\, y\in\mathbb{R},\,\, y\in g(x)\} \\
= \sup_x \sup\{z\in\mathbb{R}: \,\, -z\in g(x)\}.$$
In words, we first minimise over the possible values of a function $f$ (restricting... | {
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"openwebmath_score": null,
"tags": "information-theory, entropy, min-entropy",
"url": null
} |
java, design-patterns, beginner, generics, simulation
public void addAgentList(Class<? extends Agent> cls,
List<? extends Agent> agents)
{
listOfAgents.put(cls, agents);
}
private final Map<Class<? extends Agent>, List<? extends Agent>> listOfAgents =
new HashMap<Class<? e... | {
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"tags": "java, design-patterns, beginner, generics, simulation",
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php, mysql
For set the privileges I make this PHP code:
mysql_select_db($database_geomo, $geomo);
$query_RSfields = sprintf("SHOW COLUMNS FROM ranks WHERE Field NOT IN ('ID', 'userID', 'gruppo')");
$RSfields = mysql_query($query_RSfields, $geomo) or die(mysql_error());
$row_RSfields = mysql_fetch_assoc... | {
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Computing residues in a practical way is often done using our favorite software to get the Laurent series of $f(z)$ at $z=\pi i$.
Without computer I spontaneously expanded $f(z)$ this way (for $\,z:=\pi i+x\,$ with $\,|x|\ll 1$) : \begin{align} f(\pi i+x)&=\frac{e^{(1+i)(\pi i+x)}}{(1+e^{\pi i+x})^2}=\frac{-e^{-\pi}\;... | {
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"lm_q1q2_score": 0.8482944832111032,
"lm_q2_score": 0.8670357477770337,
"openwebmath_perplexity": 599.0337981774695,
"openwebmath_score": 0.9994819760322571,
"tag... |
slam, navigation, opencv, ros-kinetic, g2o
Originally posted by june2473 on ROS Answers with karma: 83 on 2020-02-03
Post score: 0
From this paper (section 3.5):
When a loop closure or a proximity
detection are detected or some nodes
are retrieved or transferred because
of memory management, a graph
optimization ap... | {
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"tags": "slam, navigation, opencv, ros-kinetic, g2o",
"url": null
} |
c#, excel
sheet.Range[y, 1].Text = value;
}
}
//----------------------------------------------------------------------
//simply copy data from one worksheet to another... | {
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"tags": "c#, excel",
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Thanks!
Say red machine's daily quota is 100 pills and blue machine's is 120 pills (20% greater), so total of 100+120=220 pills. Half of it would be 110 pills.
To fulfill daily quota red machine must produce 100/10=10 pills per hour and blue machine must produce 120/10=12 pills per hour.
Their combined rate, in this... | {
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"lm_q1_score": 0.9294404077216356,
"lm_q1q2_score": 0.812402692685502,
"lm_q2_score": 0.8740772253241802,
"openwebmath_perplexity": 14178.086724899626,
"openwebmath_score": 0.25008293986320496,
"tags": ... |
frequency, oscillators, resonance
At the simplest level this is because at the natural frequency $(f=f_0)$ the driving force is always in phase with the natural motion of the system. The driving force is then always adding energy to the system, which will increase indefinitely unless there is some form of damping (eg ... | {
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "frequency, oscillators, resonance",
"url": null
} |
rna-seq, docker, wdl
Title: Using Broad Institute RNAseq pipeline There is a Github report for Broad's pipeline on RNA-Seq. It has a docker build file and WDL scripts.
However, I don't see how any of the WDL script is being used in the docker (Dockerfile). It looks like Broad's docker runs on the standard command-line... | {
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"tags": "rna-seq, docker, wdl",
"url": null
} |
# Burning a rope to count time
A rope burns irregularly in 16 minutes and costs 32 rupees, while a second rope burns also irregularly in 7 minutes and costs 14 rupees. Both can be lit only at one end and can be turned off and lit again as many times we want, until they are completely burned. In what way can we count 1... | {
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"lm_q1q2_score": 0.8147529629549333,
"lm_q2_score": 0.8333245932423308,
"openwebmath_perplexity": 863.6717175477087,
"openwebmath_score": 0.469523161649704,
"tags... |
python, performance, algorithm, python-3.x, primes
I have changed the string, but you can see that the for loop is just the same as before. Now to actually turn this into a string, we need to pass it to "".join. join is called on a string object, and whatever you put in that string object is inserted between each valu... | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "python, performance, algorithm, python-3.x, primes",
"url": null
} |
algorithms, turing-machines
Show how to solve it using a number of operations that is polynomial in the size of the input. This means you have to specify a Turing machine to do it, and prove that each of the operations takes a polynomial amount of time. Alternatively, you would prove that the turing machine spends a p... | {
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"tags": "algorithms, turing-machines",
"url": null
} |
vibrations
Title: How does a vibratory bowl feeder cause the parts to move up? When I first learned about bowl feeders I thought that there was some sort of rotation that would cause it to go up, but apparently it is caused by vibrating the bowl.
I do not understand how vibrations can cause a part to move upwards. Fro... | {
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"tags": "vibrations",
"url": null
} |
python, python-3.x, multithreading, http, network-file-transfer
class Downloader:
def __init__(self):
self.recent = deque([0] * 12, maxlen=12)
self.recentspeeds = deque([0] * 200, maxlen=200)
self.dic = dict()
self.workers = [] | {
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vectors, coordinate-systems
However, I also noticed a similar relationship for the Cartesian unit vectors:
$\hat{\textbf{x}} =
\sin\theta \cos\phi \, \hat{\textbf{r}}
+\cos\theta \cos\phi \, \hat{\boldsymbol{\theta}}
-\sin\phi \, \hat{\boldsymbol{\phi}}$
$\hat{\textbf{y}} =
\sin\theta \sin\phi \, \hat{\textbf{r}}
+ ... | {
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"tags": "vectors, coordinate-systems",
"url": null
} |
newtonian-mechanics, forces, work, definition, displacement
If the body moves in straight line, you have to take the component along the force's direction.
For example, if you push a block during a 3m path in front of you, then the distance is 3m.
However, if the block moves 3m to North-west but the force is north-dir... | {
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"url": null
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Therefore $$G_n(u)\to G_0(u)$$ for all point $$u\in(0,1)$$ of continuity of $$G_0$$. As a uniform variable $$U\in(0,1)$$ is almost surely a continuity point of $$G_0$$, we get that $$G_n(U)\to G_0(U)$$ almost surely (and obviously also in probability).
*: We also encounter (perhaps more often) the left-continuous inve... | {
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"lm_q1q2_score": 0.8003291916878967,
"lm_q2_score": 0.8128673087708699,
"openwebmath_perplexity": 281.0727960336061,
"openwebmath_score": 0.9824701547622681,
"tag... |
c#, asp.net-web-api
Not specifying any fields would bring back the full default model as the response body.
This is a Web API 2 project with Entity Framework 6 using C# 6. I'm using AutoMapper to go from Entity object to Dto where necessary. What I have right now functions as I wanted for the most part, but I'm sure... | {
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"tags": "c#, asp.net-web-api",
"url": null
} |
c++, c++11, array
sz_t i;
for (i = 0; i < sz; i++)
{
data()[i].~C();
}
sz = 0;
}
template<class sz2_t, sz2_t maxsz2> inlinearray(inlinearray<C,sz2_t,maxsz2> that)
{
size_t i;
sz = that.sz;
for (i = 0; i < sz; i++)
{
push_back(that[i]);
}... | {
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"openwebmath_score": null,
"tags": "c++, c++11, array",
"url": null
} |
python, parsing, homework, bioinformatics
Title: Python Fasta Parser using dictionaries without using BioPython or other external libraries I am writing my own parser for fasta format. I can't use Biopython or anything else, because it's a part of an assigment and our teacher wants us to try to do it manually.
For now... | {
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"tags": "python, parsing, homework, bioinformatics",
"url": null
} |
ros, action-server, ros-kinetic
Title: Action Server Compiler Error => error: no match for call to ‘(boost::_mfi
Hi all,
I have a problem about creating an action_server on ROS1. I have created a few action server programs in the past. But never get this error which i will tell the details of. My action server progra... | {
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"tags": "ros, action-server, ros-kinetic",
"url": null
} |
waves, string, wavelength, harmonics
\end{aligned} $$
or
$$\begin{aligned}
A_i &= \frac{2}{i\,\pi\,c} \int \sin\left(i \frac{\pi x}{\ell} \right) v_0(x) {\rm d}x = 0 \\
B_i & = \frac{2}{\ell} \int \sin\left(i \frac{\pi x}{\ell} \right) y_0(x) {\rm d}x = \frac{2 Y \ell^2}{\pi^2 i^2 x_P (\ell-x_p)} \sin\left(i ... | {
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"openwebmath_score": null,
"tags": "waves, string, wavelength, harmonics",
"url": null
} |
c#, async-await
Title: Class for easier to read IProgress handling (Version 2.0) This is an update to my question Class for easier to read IProgress handling and includes the suggestions from @svick, with one exception.
It was also suggested to change the setter for Content, so the report object could be set directly.... | {
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2. ## Re: Finding the area of a window
Have you found the length of the slant side in terms of a and b?
3. ## Re: Finding the area of a window
Originally Posted by Debsta
Have you found the length of the slant side in terms of a and b?
I am honestly not sure how to do this one at all.the perimeter written there had ... | {
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"openwebmath_score": 0.77018803358078,
"tags... |
python
You could shorten this further and clearer by combining the two conditions then:
if state == 'click' and af_button.checked != 1:
squishtest.clickButton(squishtest.waitForObject(af_button))
elif state != 'click' and af_button.checked != 0:
squishtest.clickButton(squishtest.waitForObject(af_button)) | {
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"url": null
} |
ros, nao-robot, naoqi, nao
Title: Trouble running nao_driver package
Hello,
I have been trying for a few days to run nao_driver package, with no sucess. I looked around for answers, but none of the solutions could help me.
Aparently, Naoqi is set up correctly, since I can import it with "import naoqi" in python.
Howe... | {
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"openwebmath_score": null,
"tags": "ros, nao-robot, naoqi, nao",
"url": null
} |
-
The correct way to write composition is $f \circ g$, defined as $(f \circ g)(x) = f(g(x))$. – Srivatsan Dec 19 '11 at 19:20
Yeah, but where does $x$ come from? I mean when we do addition, there is no extra $x$ anywhere... – drozzy Dec 19 '11 at 19:23
Well, here it is important to dissociate the function from its ar... | {
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"lm_q1q2_score": 0.8008472663282373,
"lm_q2_score": 0.822189121808099,
"openwebmath_perplexity": 211.15210435248412,
"openwebmath_score": 0.9169955849647522,
"tag... |
c#, winforms, pdf
for (; pageNumber <= numberOfPages; pageNumber += increment)
{
AddFieldToPage(
field,
pageNumber,
pdfStamper,
parentField);
}
}
... | {
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"openwebmath_score": null,
"tags": "c#, winforms, pdf",
"url": null
} |
general-relativity, special-relativity, lagrangian-formalism, time, action
However, for anyone learning the subject for the first time I think there are good arguments to introduce the treatment in terms of coordinate time in the first instance. Such a treatment adopts
$$
\tilde{\cal L} = - m c^2 / \gamma
$$
and $S = ... | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "general-relativity, special-relativity, lagrangian-formalism, time, action",
"ur... |
interstellar-medium, interstellar
$$
M_J = \rho \left( \frac{\pi k_B T}{4 \mu m_\mathrm{u} G \rho} \right)^{3/2} \\
\propto \frac{T^{3/2}}{\rho^{1/2}}.
$$
Here, $k_B$, $G$, and $m_u$ are Boltzmannn's constant, the gravitational constant, and the atomic mass unit, while $T$, $\mu$, and $\rho$ are the temperature, the m... | {
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"id": 2530,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "interstellar-medium, interstellar",
"url": null
} |
general-relativity, spacetime, curvature, coordinate-systems, geodesics
So you might well be able to come up with some choice of coordinates that is curved only in the time direction. But someone else using a different coordinate system might find the curvature is in the space coordinates or more likely both time and ... | {
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"tags": "general-relativity, spacetime, curvature, coordinate-systems, geodesics",
"url":... |
ros, transforms, transform
Original comments
Comment by Eric Perko on 2011-05-11:
Ya... not sure what's up with the docs... You may want to file a ticket against tf for the docs describing what you were unable to find/the source of your confusion... at the least, there are doc strings for e.g. TransformListener in the... | {
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} |
cosmology, universe
The local view we here on earth is one of relative order. However as the field of view is changed from inside the box that most would paint us in, to a view that is able to allow the encompassing known universe as a misshapen bubble that is burgeoning in some areas and imploding a bit in others.
P... | {
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"openwebmath_score": null,
"tags": "cosmology, universe",
"url": null
} |
javascript, interview-questions, ecmascript-6, fizzbuzz
Indentation
Your indentation is all over the place. Indentation helps you read the code, being lax or inconsistent using indentation make code a 1000 times harder to read.
It does not matter what style of indentation 2 or 4 spaces 1 or 2 tabs. Don`t mix and match... | {
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"url": null
} |
matlab, fourier-transform, spectrum-estimation
The above answer is when you want to use linear shift. If you wan to use circular shift, then do it like the following:
x=w.*rhat;
phi=fft(circshift(x',M+1)');
where M is even and w and rhat are just the symmetric vectors around M+1 (for instance w=[2 4 6 4 2] is... | {
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"tags": "matlab, fourier-transform, spectrum-estimation",
"url": null
} |
algorithms
Title: Does KMP Algorithm handle finding multiple matches in overlapping cases? I am wondering if KMP algorithm can find multiple matches in a given string when there is an overlap.
Here is an example.
Word to Search from (S): abcabcabc
Search word (W): abcabc
If you look at "W", it matches "S" from i... | {
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"tags": "algorithms",
"url": null
} |
fluid-dynamics
We have two known stream lines:
$$
y = h(x)
$$
and
$$
y = 0.
$$
Let's select the stream function as follows:
$$
\psi(x,y) = C\frac{y}{h(x)}. (3)
$$
For the upper streamline we have $\psi=C$ and for the lower line $\psi=0$. This is a strong assumption and the main point of the solution. The selection of ... | {
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"tags": "fluid-dynamics",
"url": null
} |
python, beginner, python-3.x, csv
Given example of data in file2:
274451|24575|24575|3872531727|23|24575|2017-11-08 11:43:21.15|2017-11-25 16:30:21.061|STB|375g1043DC92|375g1043DC92
506406|280335|280335|4516157218|22|280335|2017-11-22 15:44:54.307|2017-11-29 11:26:02.123|STB|256d9739d3cc|256d9739d3cc
367536|163226|163... | {
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"openwebmath_score": null,
"tags": "python, beginner, python-3.x, csv",
"url": null
} |
c++, iterator, stl
Here's an example of it being applied:
/** Convert a Vector into a stream suitable for display. */
std::ostream& Vector::Print(std::ostream& out, int width) const {
out << "[" << std::setprecision(1) << std::fixed;
FixedWidthDouble::width_ = width;
std::copy(begin(), end(), std::ostream_iterat... | {
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"url": null
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c#, performance, generics, reflection, interval
namespace Services.Helpers
{
#region Custom Attributes
[AttributeUsage(AttributeTargets.Property)]
public class DoNotCopyIntoTimeWindow : System.Attribute { } // leave default
[AttributeUsage(AttributeTargets.Property)]
public class IsProcessedIntoTi... | {
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"tags": "c#, performance, generics, reflection, interval",
"url": null
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reinforcement-learning, rewards, hyper-parameters, training-datasets, human-like
and,
We train all the RL models for 256k episodes. These episodes include
about 31k unique prompts, after filtering out prompts with PII and deduplication based on common
prefixes.
If you want to know what ChatGPT does specifically, you... | {
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"tags": "reinforcement-learning, rewards, hyper-parameters, training-datasets, human-like",
"ur... |
thermodynamics, entropy, stability
We form the Hessian:
$$H = \begin{bmatrix}
-cNR/U^2 & 0 & cR/U \\
0 & -NR/V^2 & R/V \\
cR/U & R/V & -(c+1)R/N
\end{bmatrix}.$$
The principle submatrices are threefold: the ones corresponding to $(\Delta U, \Delta V)$, $(\Delta N, \Delta V)$, $(\Delta U, \Delta N)$. These ... | {
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} |
I do have a query regarding no. of ways to arrange I's together (I1 and I2). Why can not we write 4! * 2! as we can also arrange identical I's in two ways and that will give the option A (60-48 = 12).
Regards,
Raxit.
Intern
Joined: 12 Nov 2019
Posts: 3
Re: The letters D, G, I, I , and T can be used to form 5-letter st... | {
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"openwebmath_score": 0.7955590486526489,
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"url": "ht... |
The IQR can be calculated using the IQR() function, as shown in the line of code below. A large interquartile range indicates the data Values are widely dispersed. Please enable Cookies and reload the page. The broader these ranges, the higher the variability in your dataset. IQR = Q3 – Q1. IQR = Q 3 - Q 1 lnterquartil... | {
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"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9626731147976794,
"lm_q1q2_score": 0.8239048841449312,
"lm_q2_score": 0.8558511414521923,
"openwebmath_perplexity": 901.7410825750325,
"openwebmath_score": 0.560030460357666,
"tags": nul... |
Ordering the fractions from least to greatest, we find that they are in the order listed. Therefore, our final answer is $\boxed{\textbf{(B)}\ \frac{5}{19}<\frac{7}{21}<\frac{9}{23}}$.
## Solution 2
Instead of finding the LCD, we can subtract each fraction from $1$ to get a common numerator. Thus,
$1-\dfrac{5}{19}=\... | {
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"lm_q1q2_score": 0.8119679570651849,
"lm_q2_score": 0.822189123986562,
"openwebmath_perplexity": 2886.0934387298826,
"openwebmath_score": 0.6570287942886353,
... |
c#, generics
private static readonly IReadOnlyCollection<PropertyInfo> propertiesForEquality = typeof(T).GetProperties(flags).Where(p => p.GetCustomAttribute<EqualityMemberAttribute>() != null).ToList();
private static readonly IReadOnlyCollection<FieldInfo> fieldsForEquality = typeof(T).GetFields(flags).Where(p ... | {
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"url": null
} |
7. Aug 31, 2014
### PeroK
Alternatively, you should be able to do something with n (mod3) to formulate the sequence of 1, 0, 0, 1, 0, 0 ...
8. Sep 2, 2014
### andrewkirk
If we are to be rigorous, we need to take care with our definitions in defining the pattern. Recursive definitions mostly use the Recursion Theor... | {
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"lm_q2_score": 0.8774767970940975,
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"openwebmath_score": 0.7913281917572021,
"tags... |
python, unit-testing, computational-geometry, coordinate-system
The function average is built into Python under the name statistics.mean.
Much of this code is awkward because points are represented by Python tuples or lists. A simple operation like subtracting two points (in distance) requires disassembling the points... | {
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"tags": "python, unit-testing, computational-geometry, coordinate-system",
"url": null... |
c#, meta-programming, rubberduck
PropertyNameTextBox.TextChanged += PropertyNameBox_TextChanged;
ParameterNameTextBox.TextChanged += VariableNameBox_TextChanged;
LetSetterTypeCheckBox.CheckedChanged += EncapsulateFieldDialog_SetterTypeChanged;
SetSetterTypeCheckBox.CheckedChanged += Encapsulat... | {
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"tags": "c#, meta-programming, rubberduck",
"url": null
} |
jenkins, ros-kinetic
reprepro is the tool that the ROS buildfarm uses for managing its debian package repository. In order to facilitate common buildfarm actions we use a repository containing scripts for our common operations called reprepro-updater. The only changes that I would advise making would be to trim the pl... | {
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java, tree
}
} I don't see any reason for the added complexity of the second implementation. The Node class doesn't provide any methods or fields nor does it serve as a base class for your TreeNode1. It just makes naming the tree nodes worse: TreeNode is definitely a better name than Node.TreeNode1.
So in version ... | {
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"tags": "java, tree",
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} |
signal-analysis, continuous-signals, cross-correlation, correlation
Title: Investigating correlation for unequal signal lengths I have measurements from two tablet sensors. The first sensor measures the touch pressure applied to the tablet and the second sensor is the acceleration of the tablet (in z direction). The s... | {
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"tags": "signal-analysis, continuous-signals, cross-correlation, correlation",
"url": null
} |
This implies the following common refinement of the two factorizations
$$\rm a_1 a_2 = (c_{1 1} c_{1 2} c_{1 3}) (c_{2 1} c_{2 2} c_{2 3}) = (c_{1,1} c_{2 1}) (c_{1,2} c_{2 2}) (c_{1,3} c_{2 3}) = b_1 b_2 b_3$$
This immediately yields the uniqueness of factorizations into primes (atoms). It also works more generally ... | {
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"lm_q2_score": 0.8615382058759129,
"openwebmath_perplexity": 276.518186960265,
"openwebmath_score": 0.8860232830047607,
"tags":... |
interference, diffraction
Title: Can diffraction effects be ignored when $D \approx \lambda$? I was solving a textbook exercise which was stated as follows:
Derive an expression for the intensity in the interference pattern for three equally spaced slits. Express in terms of $\delta = 2\pi d \sin(\theta)/\lambda$, wh... | {
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## Worked Examples
### 1. Given integers $x, y$, describe the set of all integers $N$ that can be expressed in the form $N=ax+by$, where $a, b$ are integers.
Solution: Let $k = \gcd(x,y)$. Then any integer of the form $kn$, where $n$ is an integer, can be expressed as $ax+by$. We already know that this condition is a... | {
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"lm_q2_score": 0.8824278772763472,
"openwebmath_perplexity": 496.1830356409937,
"openwebmath_score": 0.9846743941307068,
"tag... |
fourier-transform, integration, dirac-delta-impulse
Title: Fourier Transform of $|t|$ I was going through Papoulis' book (The Fourier Integral and its Applications) when I came across the Fourier Transform for $|t|$. To find it he writes $|t|$ as (I am not sure how):
$$|t| = -\frac{1}{\pi} \int_{-\infty}^{\infty} \fra... | {
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"tags": "fourier-transform, integration, dirac-delta-impulse",
"url": null
} |
terminology, human-influence, erosion
abrasion (corrasion): The erosive action that occurs when rock particles of varying size are dragged over or hurled against a surface.
The use of ‘erosive’ in the definition perhaps doesn't make it entirely clear that this can apply to the particles as well as the surface itself,... | {
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"tags": "terminology, human-influence, erosion",
"url": null
} |
the-moon, equinox
Here is my "preliminary research":
Methodology
I suppose I could solve the 3 body problem (Sun, Earth, Moon) numerically backwards in time, but I suspect that the numerical errors and gravitation perturbations from other planets will accumulate rather quickly (how quickly?)
I could do arithmetic with... | {
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ros, ros-kinetic, ardent
**Process for starting ROS publisher:
$ source /opt/ros/kinetic/setup.bash
$ source <path_to_folder>/ros1_bridge_overlay/catkin_ws_overlay/devel/setup.bash
$ rosrun my_interfaces test_publisher // How I named my executable
**Process for starting ROS2 subscriber:
$ source /opt/ros/arde... | {
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"openwebmath_score": null,
"tags": "ros, ros-kinetic, ardent",
"url": null
} |
javascript, css, animation, dom
Title: JavaScript code to add buttons and slowly remove them My javascript code is working, however i am seeking suggestions on how I can go about improving my existing code for reusability and testability. The code is pretty straight forward, I have three buttons "add", "slow remove" a... | {
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"openwebmath_score": null,
"tags": "javascript, css, animation, dom",
"url": null
} |
c#, generics, hash-map, enum, extension-methods
[AutoEqualityProperty]
public SoftString Name { get; }
[AutoEqualityProperty]
public T Tag { get; }
public override int GetHashCode() => AutoEquality<ItemKey<T>>.Comparer.GetHashCode(this);
public override bool Equals(object obj) => obj is ItemKey<... | {
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"openwebmath_score": null,
"tags": "c#, generics, hash-map, enum, extension-methods",
"url": null
} |
c++, multithreading, c++17
// Pop the front task
// move shouldn't throw
auto const task = std::move(_toDo.front());
_toDo.pop();
// Allow other tasks to
// be added while we're executing one
lock.unlock(); // won't throw
try {
// execute task
... | {
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "c++, multithreading, c++17",
"url": null
} |
special-relativity, inertial-frames
In the preceding paragraph concerning the doubt he states that the defining particles in S' (that I think it is particles at rest relative to S') are moving with constant velocity in S. That said, for me $dx'/dt'$ should be zero. What am i missing? Any help would be appreciated. The... | {
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"tags": "special-relativity, inertial-frames",
"url": null
} |
java, performance, ai, compiler, prolog
//should we write false? it would end the array decomposition
return null;
}
//case var/cste
if(Annuaire.val(s1.code)==null && Annuaire.val(s2.code)!=null){
if(caseDisplay){
... | {
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"openwebmath_score": null,
"tags": "java, performance, ai, compiler, prolog",
"url": null
} |
dna
When someone says:
'there is no health risk from XYZ'
what they mean is..
"to the extent that we can determine, we can't see any more chance of adverse health if you are exposed to XYZ conditions than if you weren't"
DNA damage happens all the time. The frequent flier study you cite is trying to see if the addi... | {
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"tags": "dna",
"url": null
} |
reference-request, nondeterminism, semantics, formal-methods
"wp (c1;;c2) Q s = wp c1 (wp c2 Q) s"
is a valid formulation for w.p. for compositions, as, naturally, executing c1 you want to end up in a state belonging to the weakest precondition of wp(c2, q), which, in turn, means that after further executing c2 (in ... | {
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c#, object-oriented, library
/// <summary>Sets the owner's value</summary>
public void SetValue(TrackableEntity owner, T value)
{
T foundValue;
if (values.TryGetValue(owner.Id, out foundValue) && foundValue.Equals(value)
{
return;
}
owner.IsDirty = true;
... | {
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"tags": "c#, object-oriented, library",
"url": null
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kinect
Originally posted by jarvisschultz with karma: 9031 on 2014-10-31
This answer was ACCEPTED on the original site
Post score: 1
Original comments
Comment by mh on 2014-11-11:
Thank you very much for this explanation and the additional helpful information! | {
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only when the front is true except when both components are true has. This a self-contradiction think of the given statement is really a combination a... Also try to discuss examples biconditional statement truth table in natural language and code back is only. a triangle is isosceles if and only if q, its,... Email an... | {
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"openwebmath_perplexity": 525.5291997350896,
"openwebmath_score": 0.49255892634391785,
"ta... |
fourier-transform
The electric field (E) at an event is the derivative of the action of the electromagnetic field with respect to the electric polarization density at that event.
The magnetic induction (B) at an event is the derivative of the action of the electromagnetic field with respect to the magnetization at tha... | {
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"tags": "fourier-transform",
"url": null
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ferromagnetism
No, the energy came from you walking up to the top of the hill to put the ball there in the first place.
This is going to be true of all "conservative" forces, like gravity or magnetism (or lots of others). | {
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"tags": "ferromagnetism",
"url": null
} |
ros, turtlebot, android-teleop, ros-electric
Original comments
Comment by fergs on 2011-12-18:
Stack maintainers must do a release before updates are pushed from source to debs. TurtleBot has not been re-released yet.
Comment by JamesRonald on 2011-12-17:
Fergs, I just received a bunch of ros-electric-turtle updates v... | {
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capabilities, and find the solution that is right for your application or industry. To see what this does for us, write v(t) for the time derivative θ. Professor for Post Graduation, Department of Mechanical Engineering, Bangalore Institute of Technology, Bangalore Introduction A two degree of freedom system is one tha... | {
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"lm_q1_score": 0.9817357259231532,
"lm_q1q2_score": 0.809403734138827,
"lm_q2_score": 0.824461932846258,
"openwebmath_perplexity": 797.8372050585724,
"openwebmath_score": 0.5793882012367249,
"tags": null... |
Lagrange Interpolation
Linear interpolation is interpolation by the straight line through (x0, ƒ0), (x1, ƒ1); see Fig Thus the linear Lagrange polynomial p1 is a sum p1 = L0ƒ0 + L1ƒ1 with L0 the linear polynomial that is 1 at x0 and 0 at x1; similarly, L1 is 0 at x0 and 1 at x1. Obviously, This gives the linear Lagrang... | {
"domain": "slideplayer.com",
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"lm_q1_score": 0.9927672374804856,
"lm_q1q2_score": 0.8022226552973304,
"lm_q2_score": 0.8080672135527632,
"openwebmath_perplexity": 1697.246070172658,
"openwebmath_score": 0.8605360388755798,
"tags"... |
image-recognition, deep-learning, classification
Title: How does Wolfram's Image Identification Project work? Wolfram Language Image Identification Project launched an Image Identify site demo which returns the top predicted tags for the photos.
How does it work, briefly? I mean what type of learning vision technologi... | {
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "image-recognition, deep-learning, classification",
"url": null
} |
c#, tree, iterator, iteration
Occasionally a CompositeTask will tick a sub-task that returns Status.RUNNIGN. This means that the sub-task requires more time than a single frame to perform some action and is requesting to be ticked again during the next Engine update/frame/loop. When a sub-task returns a running status... | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "c#, tree, iterator, iteration",
"url": null
} |
c, winapi
int choice = get_menu_choice();
static int hotkey = KEY_F5; /// default hotkey
switch(choice) {
case 1:
hotkey = get_hotkey();
init_menu(head, tail, SAVED_HOTKEY, hotkey);
break;
case 2:
chosen_recording(head, tail, hotkey);
... | {
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"openwebmath_score": null,
"tags": "c, winapi",
"url": null
} |
for additional. Move mouse to apply filter to different parts of the image. The linear convolution (2) Using Discrete Fourier Transform it is assumed that some signal samples in the respective. In practice, we generally need to calculate the convolution of very long sequences. A Fourier modulus also loses too much info... | {
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"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9838471680195556,
"lm_q1q2_score": 0.82822778291892,
"lm_q2_score": 0.8418256512199033,
"openwebmath_perplexity": 860.205398522123,
"openwebmath_score": 0.8229966163635254,
"tags": null,... |
mechanical-engineering, fluid-mechanics
This is what confused me. From this observation , I think 2nd bucket should fill up faster than the 1st one.
Why ? Because if I imagine the separation between the bucket and water at an extreme level. Then , I can see like drops filling up the bucket and not like a stream of flo... | {
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"tags": "mechanical-engineering, fluid-mechanics",
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gives sequence of diagonal sum $\color{red}1,\color{blue}1,\color{green}2,\color{cyan}4,\color{magenta}7,\dots$, Tribonacci sequence, etc.
-
Sorry, I'm slow: how are you computing your diagonal sums? – Guess who it is. Dec 18 '11 at 1:29
Also, if you look here, I'd say it's pretty convenient to have the generalized F... | {
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"lm_q1_score": 0.9693241965169938,
"lm_q1q2_score": 0.8742535357379186,
"lm_q2_score": 0.9019206771886166,
"openwebmath_perplexity": 476.2738541921384,
"openwebmath_score": 0.8445354104042053,
"tag... |
organic-chemistry, isomers
The summary:
While there are 2 hydrogen atoms on a carbon atoms - or more generally, there are only 3 kinds of groups on a C atom - the groups/atoms of the same kind are interchangeble and you can rotate the molecule to match the mirror image.
If there are 4 different groups on C atoms, yo... | {
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"openwebmath_score": null,
"tags": "organic-chemistry, isomers",
"url": null
} |
electromagnetism, magnetic-fields, terminology, nuclear-magnetic-resonance
Title: What is 90 or 180 "degree" RF pulse in MRI? I am studying MRI, specifically spin echoes.
Now I kind of understand how magnetic resonance imaging works, but what I'm stuck is the definition of "degree" in MRI. What I thought was that if I... | {
"domain": "physics.stackexchange",
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"openwebmath_score": null,
"tags": "electromagnetism, magnetic-fields, terminology, nuclear-magnetic-resonance",
"ur... |
electromagnetic-induction
Moreover, is this also true if the solenoids intersect at say an angle? No, it doesn't need to assume the fields outside the solenoid are zero.
The use of long solenoids is convenient because you can compute the flux easily and do the integrals easily. But you could also take two loops separ... | {
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"openwebmath_score": null,
"tags": "electromagnetic-induction",
"url": null
} |
• Sorry, I had typos in what I wrote. Please replace $u(2.34-t)$ by $x(2.34-t)$ in two places in the displayed equation. May 8 '16 at 18:17
• @DilipSarwate I've edited your previous comment with that correction.
– Peter K.
May 8 '16 at 18:40 | {
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"lm_q2_score": 0.822189134878876,
"openwebmath_perplexity": 908.1400440896086,
"openwebmath_score": 0.9999880790710449,
"tags... |
c#, unity3d
GameObject recipient = hit.transform.gameObject;
if (recipient.tag == "Player" && !isBeingTouched)
{
OnTouchEnter(touch);
}
}
if (beingTouchedByFingerNumber != -1)
{
dc.ChangeText(7, "Touched by Phase: " + Input.GetTouch(beingTouchedByFingerNumber).p... | {
"domain": "codereview.stackexchange",
"id": 14567,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "c#, unity3d",
"url": null
} |
javascript, jquery, html
var currentPosition = $.inArray(modImageSource, galleryImages);
if (currentPosition < 0 ) {
currentPosition = 0;
}
var next;
if (direction === "next") {
next = (currentPosition + 1 < galleryImages.length - 1) ? currentPosition + 1 : 0;
} else if (direction... | {
"domain": "codereview.stackexchange",
"id": 8776,
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"lm_q1q2_score": null,
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"openwebmath_score": null,
"tags": "javascript, jquery, html",
"url": null
} |
-
Looks fine to me. – Brian M. Scott Jan 5 '13 at 18:56
That's all correct! I've voted to close rather than posting an answer because I don't think the nature of the question will give rise to many useful answers. (Not that it's a bad question, of course!) – Clive Newstead Jan 5 '13 at 18:56
@Clive Newstead: why clos... | {
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"lm_q1_score": 0.984575447918159,
"lm_q1q2_score": 0.8049637582929858,
"lm_q2_score": 0.817574478416099,
"openwebmath_perplexity": 701.4820814148593,
"openwebmath_score": 0.8491717576980591,
"tags"... |
bash, ios
#if file exists
if [ -e "$FILENAME" ]
then
#If downloaded file exeeds 1MB it should have been a success
#fsize=$(stat -c %s $FILENAME)
#echo $fsize
if [ $(stat --format="%s" "$FILENAME") -gt 1000000 ]; then
#import to iBooks and add to newsstand
cd /private/var/mobile/Medi... | {
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"lm_q2_score": null,
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"openwebmath_score": null,
"tags": "bash, ios",
"url": null
} |
computability, denotational-semantics
We can now explain why every computable map is continuous. Suppose $D$ and $E$ are $\omega$CPOS and $f : D \to E$ computable. Suppose $x \in D$, $e \in E$, $e$ is compact, and $e \leq f(x)$. Intuitively, this say that "finite piece of information $e$ appears in the output $f(x)$".... | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "computability, denotational-semantics",
"url": null
} |
thermodynamics
Title: Thermal strain of a rod between two walls
I don't understand how thermal strain is \begin{gather*}\alpha\Delta T\\\end{gather*}
If the walls were not there, length of the rod would have been \begin{gather*}L_{o}(1+\alpha\Delta T)\\\end{gather*}
and now when the walls are brought closer to compre... | {
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"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "thermodynamics",
"url": null
} |
quantum-field-theory, mathematical-physics, symmetry, vacuum, symmetry-breaking
Title: Why Goldstone Bosons? (A Question about VEVs) I understand how the mechanism of spontaneous symmetry breaking works, and why it produces Goldstone bosons (for global symmetries) and massive gauge bosons (for local ones).
However, I'... | {
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"openwebmath_score": null,
"tags": "quantum-field-theory, mathematical-physics, symmetry, vacuum, symmetry-breaking",
... |
ros, gazebo, urdf, sdf, xacro
Original comments
Comment by ChickenSoup on 2013-05-13:
If you can provide more information, like the error msg etc, it would be easy to help.
Comment by Gazer on 2013-05-14:
Ok. I am interested in opening up the file download from https://github.com/utexas-bwi/segbot/tree/master/segbot_d... | {
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"tags": "ros, gazebo, urdf, sdf, xacro",
"url": null
} |
algorithms, mathematical-programming
I'm not too curious in the actual programming, I'm searching for a way to write this down nicely. Maybe there is even an existing implementation for this? I'm having troubles asking google for the lack of search terms.
I implemented it myself, but it got a lot of code, so I'm in se... | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "algorithms, mathematical-programming",
"url": null
} |
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