text stringlengths 1 1.11k | source dict |
|---|---|
countless resources help. X_J must take integer values of 0 or 1 ì í ê³íë² ê¸°ë³¸ ì¬í: ... The value of 0 or 1 specific chemical composition where available and see local and! A web site to get translated content where available and see local events and offers 0-1 integer:... ê¸°ë° í¼í© ì ì ì í ê³... | {
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"openwebmath_perplexity": 1678.2338945469435,
"openwebmath_score": 0.628940463066... |
c
Are there register variables that shouldn't be, how can I further optimize this code?
I'm trying to rewrite it from scratch. How does this look?
Mis-matched function signature
OP code uses
void *MemContainsMem(const void *StrStart, register unsigned long StrLen,
const char *Substr, register const unsigned cha... | {
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• Ah, I am trying to understand what you are getting at. Are you saying that in the first case I derived a power series around $x=1$ and in the second case I set it up around $x=0$? – imranfat Nov 22 '15 at 22:09
• @imranfat Yes that's right. Something to keep in mind, when you find the Taylor expansion for a function ... | {
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"openwebmath_score": 0.8202622532844543,
"ta... |
homework-and-exercises, rotational-dynamics, energy-conservation, friction, rigid-body-dynamics
Title: Energy Conservation in Rolling without Slipping Scenario
A solid ball with mass $M$ and radius $R$ is placed on a table and given a sharp impulse so that its center of mass initially moves with velocity $v_o$, with ... | {
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"tags": "homework-and-exercises, rotational-dynamics, energy-conservation, friction, rigid-... |
c#, design-patterns, template, generics, winforms
TemplateLabel = new ControlTemplateCreator<Label>(_templateLabel);
}
}
public class Foo
{
public void Bar()
{
Label clonedLabelFromTemplate = Settings.TemplateLabel.Clone();
}
}
The code looks pretty good to me, it's extendable, you can create... | {
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"url": null
} |
automata, finite-automata, nondeterminism
Title: Problems with simulating NFA with DFA I have this NFA:
I want to simulate it with a DFA, thus I have the states {1}, {2}, {3}, {1,2}, {1,3}, {2,3} and {1,2,3}. Usually I look at every state and find out in which state I could end up when selecting a letter. However her... | {
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"tags": "automata, finite-automata, nondeterminism",
"url": null
} |
algorithms, search-algorithms, parallel-computing, spanning-trees, mapreduce
Title: Karloff's algorithm applied to sparse graphs I'm given a graph $G = (V, E)$ with $|V| = N$ and $|E| = m \ge N^{1+c}$ edges for some constant $c >0$. $G$ is called a $c$-dense graph.
Karloff [1, p.6] has given a map-reduce algorithm ca... | {
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"tags": "algorithms, search-algorithms, parallel-computing, spanning-trees, mapreduce",
"url": ... |
type-theory
and if $\Gamma,b::\beta\vdash p[b]::\alpha$ is a sequence of terms depending on the nonrecursive arguments in $b::\beta$ and $\Gamma,b::\beta,x::\xi_i\vdash\pi_i[b,x]::\alpha$ is also a sequence of terms, then the type of the recursor is given by the following rule:
$$
\frac{\Gamma,t:F\vdash K\ \mathsf{spe... | {
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ros, roscpp, service
Originally posted by Wim with karma: 2915 on 2011-09-12
This answer was ACCEPTED on the original site
Post score: 0 | {
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# How does $e^{-j\pi n}$ become $(-1)^n$
For
$$e^{-j\pi n}$$
How does this become $$(-1)^n$$
or is it actually $$(-1)^{-n}$$ I have checked on calculator and values are all the same when the same n value is used
• Check Euler's Formula (en.wikipedia.org/wiki/Euler%27s_formula) Apr 8 '17 at 2:15
• so the negative do... | {
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"tag... |
physical-chemistry, equilibrium
The issue is that we use the concentration (or pressure) of a substance in the equilibrium expression because it is a shortcut. What we are actually putting into the expression is the activity of that substance, a more complicated idea. It very often reduces to the ratio of the concen... | {
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I think that some insight for the proof comes from Dr. Math: Math Forum: Ask Dr. Math FAQ: Pythagorean Triples
• Jun 7th 2010, 07:45 AM
Samson
Quote:
Originally Posted by roninpro
I'm not entirely sure that will work; one solution that I found was $x=2, y=1, z=3$, which gives $4+5=9$ - we have some trouble with the 5.... | {
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"openwebmath_score": 0.8737998008728027,
"tag... |
quantum-mechanics, quantum-information
Title: Quantum entanglement actually can affect particles across distance? https://www.google.com/amp/s/amp.livescience.com/28550-how-quantum-entanglement-works-infographic.html?espv=1
In this article, it says "In quantum physics, entangled particles remain connected so that acti... | {
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example, from kilo-unit to mega-unit.All metric prefixes are powers of 10. For example, meters, centimeters, and millimeters are all metric units of length. Once a number is expressed in engineering notation, its power of 10 can be replaced with its metric prefix. The only exception is ‘micro’, which is a Greek word. P... | {
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"lm_q2_score": 0.8947894696095782,
"openwebmath_perplexity": 1400.9622831616473,
"openwebmath_score": 0.6760522127151489,
"tags":... |
orbital-motion, astronomy, computational-physics, solar-system, celestial-mechanics
Simulation: https://codepen.io/DerkJanS/full/OJMRgvW
UPDATE: I know have this:
Based on http://www.planetaryorbits.com/ Kepler's First Law states that planets (or any orbiting body) will travel in an ellipse where the center object (i... | {
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"tags": "orbital-motion, astronomy, computational-physics, solar-system, celestial-mechanic... |
continuous-signals, linear-systems, stability
Title: Is my answer incomplete? Checking the stability of a system Yesterday, during my exam, I had the following exercise:
Given $$H(s) = \frac{1}{s^2+2s+4}$$ check if it's stable.
which was supposed to be the hardest (since it was the last one). From my knowledge, I qu... | {
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"url": null
} |
quantum-mechanics, quantum-interpretations
real values change…) It seems that quantum mechanics is unique in this regard; for all other theories, we may freely not differentiate ontology and gnoseology, there is no difference. For all other theories, we may even say, for example, that nothing exists, and we only deal ... | {
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"tags": "quantum-mechanics, quantum-interpretations",
"url": null
} |
deep-learning, image-recognition, natural-language-processing
Title: How to build a commercial image captioning system? Image Captioning is a hot research topic in the AI community. There are considerable image captioning models for research usage such as NIC, Neural Talk 2 etc. But can these research models be used f... | {
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"tags": "deep-learning, image-recognition, natural-language-processing",
"url": null
} |
ros, message
So that's it! I'll reiterate it here with command line input (this is the same as above):
From the GUI, make a new folder in the home directory 'testkin_ws' and inside that make a folder 'src'. You get ~/testkin_ws/src/. Copy the source files and folders into 'src', open in an editor and change all inst... | {
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"tags": "ros, message",
"url": null
} |
python, reinventing-the-wheel, set
set_test = Set([1, 2, 3, 4, 5])
set_test2 = Set([4, 5, 6, 7, 8])
print(set_test.is_subset(set_test2)) Since you explicitly ask about your is_subset implementation in the title, I will review this first, and the rest of the code afterwards.
Bug
As I already commented on the question, ... | {
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"tags": "python, reinventing-the-wheel, set",
"url": null
} |
c++
This works as expected but my editor gives me a style-guide warning for the function signature.
runtime/references: Is this a non-const reference? If so, make const or use a pointer: cv::Mat &cv_matrix
So how should this be done? I have tried to do as the style-guide suggests but been unable to get working code a... | {
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When posting on Brilliant:
• Use the emojis to react to an explanation, whether you're congratulating a job well done , or just really confused .
• Ask specific questions about the challenge or the steps in somebody's explanation. Well-posed questions can add a lot to the discussion, but posting "I don't understand!" ... | {
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"openwebmath_score": 0.9564879536628723,
"ta... |
statistical-mechanics, entropy, approximations
Title: A Problem With Deriving Ideal Gas Entropy From Multiplicity To derive the entropy of an ideal gas via the ergodic hypothesis, we first find the density of states function:
$$g(E)=\frac{V^{N}}{h^{3N}}\frac{(2\pi m E)^{\frac{3N}{2}}}{\left(\frac{3N}{2}-1\right)!}\fra... | {
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"tags": "statistical-mechanics, entropy, approximations",
"url": null
} |
c#, math-expression-eval
// if it is last character number, we have to check it after loop ends, because we can't loop no more
if (flagMultiplyDivide)
{
if (previousOperator.Equals('*'))
{
currentNumberDouble = MultiplyNumbers(currentNumberString, temporaryNumberString);
... | {
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"tags": "c#, math-expression-eval",
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homework-and-exercises, electrostatics, experimental-physics, charge
In answer to your block-quoted question: if you are imagining measuring few-electron charges with a leaf electroscope, you have some order-of-magnitude computations to do about the masses and forces involved in that apparatus.
But don't take this res... | {
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"tags": "homework-and-exercises, electrostatics, experimental-physics, charge",
"url": nu... |
quantum-mechanics, quantum-field-theory, path-integral, thermal-field-theory
If we now consider this from a path integral perspective we can consider the partition function
$$Z(\beta)=\int\mathcal{D}{q}\mathcal{D}\bar{\psi}\mathcal{D}{\psi}\exp\left[-\int_0^\beta d\tau \frac{1}{2}\left(\dot{q}^2+\omega^2q^2\right)+\ba... | {
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"tags": "quantum-mechanics, quantum-field-theory, path-integral, thermal-field-theory",
"... |
thermodynamics, statistical-mechanics
@MarkMitchison kindly pointed out that the density of state depends on the dispersion relation. What are the general definitions of $$E, p$$ in terms of $$\omega, k$$? E.g. for the first case $E=\hbar \omega$ and $p=\hbar k$. So the question is: what are the respective values for ... | {
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"tags": "thermodynamics, statistical-mechanics",
"url": null
} |
python, python-3.x, xml, lxml
# discount
if price_tag in offer.keys() and oldprice_tag in offer.keys() \
and offer[price_tag] is not None and offer[oldprice_tag] is not None:
old = float(offer[oldprice_tag])
new = float(off... | {
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"tags": "python, python-3.x, xml, lxml",
"url": null
} |
c++, optimization, sieve-of-eratosthenes
Title: Sieve of Eratosthenes optimization I have applied some optimizations like storing only odd values
and starting to mark off from square of the number.
Can it be optimized further?
bool * isPrime = new bool [n/2];
for (int i=0; i < n/2; ++i)
isPrime [i] = true;
cout<... | {
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"tags": "c++, optimization, sieve-of-eratosthenes",
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python, optimization, genetic-algorithms
Defining a Problem to Optimize Now we're going to put together a simple example of using a genetic algorithm in Python. We're going to
optimize a very simple problem: trying to create a list of N numbers
that equal X when summed together.
If we set N = 5 and X = 200, then t... | {
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The range of a function is the set of output values when all x-values in the domain are evaluated into the function, commonly known as the y-values. gebraic methods to computethe value of a limit of a function. (a) Interpret the domain and range. If there is a requirement that a y-value produced by a function. Every fu... | {
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"openwebmath_score": 0.6847590804100037,
... |
rocket-science
Title: How does fire create thrust in rocket? All big rockets are burning either gas or fluid to create thrust. While this is so, I have filled up a plastic bottle with air at high pressure, and it can go long distances by blowing the pressurised air at reverse direction. If my bottle can do this withou... | {
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"tags": "rocket-science",
"url": null
} |
ros2
Title: How should I choose appropriate QoS policy?
I am developing a ROS2 node which subscribes a camera topic and does image processing afterwards. I set the QoS policy as SensorDataQoS whose depth is 5, but I found that the latency was quite long by "ros2 topic delay". The latency is shorten to normal value ti... | {
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"tags": "ros2",
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} |
hashing, streaming-algorithm
I have already resolved the first exercise, finding a max R tail length of 0 for (a) and 4 for (b) and (c), therefore the resulting estimation of distinct elements is respectively 1,16,16. (it is not asked to do averages/medians of the hash functions to find a better value)
However, I can'... | {
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"tags": "hashing, streaming-algorithm",
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Hence, this series converges uniformly for all $$x \in \mathbb{R}$$ by the Dirichlet test -- since $$(\ln k)^{-1}$$ converges to $$0$$ monotonically and uniformly with respect to $$x$$.
Proving that $$\sum_{k=1}^n \frac{\sin kx}{k}$$ is uniformly bounded requires some effort. Because of periodicity, we can consider WL... | {
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"ta... |
Clarification, or responding to other sets and metric space X metrics from old Problem...! ) a star 's nuclear fusion ( 'kill it ' ) such that, every space. Space - Mathematics Stack Exchange is a subset of a metric space 1 Prove that the boundary the... Have n't found an answer to this RSS feed, copy and this! Points,... | {
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"lm_q1q2_score": 0.8257502898176386,
"lm_q2_score": 0.8577681031721325,
"openwebmath_perplexity": 526.111156095374,
"openwebmath_score": 0.6814806461334229,
"... |
python-3.x, bitwise
Given that we need to apply a bias anyway,
it seems more convenient to operate on strictly
non-negative numbers:
def single_number(nums: list[int]) -> int:
BIAS = 2**31
nums = [num + BIAS for num in nums]
assert all(num >= 0 for num in nums)
res = 0
for bit in range(32):
... | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "python-3.x, bitwise",
"url": null
} |
function that isn't continuous. How to solve: Write down a function that is continuous at x = 1, but not differentiable at x = 1. But even though the function is continuous then that condition is not enough to be differentiable. Just to realize the differentiability we have to check the possibility of drawing a tangent... | {
"domain": "com.br",
"id": null,
"lm_label": "1. YES\n2. YES\n\n",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9678992923570262,
"lm_q1q2_score": 0.8338822215263384,
"lm_q2_score": 0.8615382076534742,
"openwebmath_perplexity": 207.28947880393957,
"openwebmath_score": 0.8916527628898621,
"tags": nu... |
natural-language-processing
for row in rows:
row["keyword"] = process_text(row["keyword"])
filename = "processed.csv"
with open(filename, 'w', newline='', encoding='utf-8') as csvfile:
writer = csv.DictWriter(csvfile, fieldnames=list(rows[0].keys()))
writer.writeheader()
writer.writerows(rows)
# Clos... | {
"domain": "ai.stackexchange",
"id": 3951,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "natural-language-processing",
"url": null
} |
python, random, formatting
y, x = lst.pop()
# Determine if we should paint it
if painted <= maxPainted:
avatar[y][x] = fill
painted += 1
# Find all available neighbors and add them to the ... | {
"domain": "codereview.stackexchange",
"id": 14035,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "python, random, formatting",
"url": null
} |
rviz, pointcloud
{
geometry_msgs::Point32& pC = cloud.points[i];
pC.y = *(it) * 0.001;
myfile2 << *(it++) * 0.001 <<"\n";
pC.x = *(it) * 0.001;
myfile2 << *(it++) * 0.001 <<"\n";
pC.z = *(it) * 0.001;
myfile2 << *(it++) * 0.001 <<"\n";
... | {
"domain": "robotics.stackexchange",
"id": 5738,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "rviz, pointcloud",
"url": null
} |
18 bronze badges skewness gains importance from the mean after raising them integer. From physics tendency, variation, skewness and the measures of relative skewness, namely, 2020 by Pipis., negative skewness is a measure of skewness should have three properties sample could bear exact witness its! Than 0 flatness or p... | {
"domain": "shivjeet.com",
"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9559813451206063,
"lm_q1q2_score": 0.812556582369208,
"lm_q2_score": 0.8499711699569787,
"openwebmath_perplexity": 1897.481031938312,
"openwebmath_score": 0.5925322771072388,
"tags": nu... |
halting-problem
Title: Can a runtime environment detect an infinite loop? Would it be possible for a runtime environment to detect infinite loops and subsequently stop the associated process, or would implementing such logic be equivalent to solving the halting problem?
For the purpose of this question, I define an "i... | {
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"id": 18138,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "halting-problem",
"url": null
} |
java, beginner, datetime
/*Following is the better version (written by me) of the 'smelly code'
above*/
for( int month_index = FEBRUARY; month_index <= month;
month_index++ ) //months runs from FEBRUARY to month variable
dayOfMonth2 += Month_length[month_index];
... | {
"domain": "codereview.stackexchange",
"id": 14448,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "java, beginner, datetime",
"url": null
} |
c#, performance, sql, file-system
while (runLoop)
{
Console.Clear();
// reset variables
fileName = "";
documentID = Guid.Empty;
location = "";
using (SqlConnection connection = new SqlConnection(connString))
... | {
"domain": "codereview.stackexchange",
"id": 4710,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "c#, performance, sql, file-system",
"url": null
} |
php, mysql, php5, mysqli
It's a little more overhead, but it's safer. | {
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"id": 7174,
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"lm_name": null,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "php, mysql, php5, mysqli",
"url": null
} |
java, logging
public static Logger getConfiguredLogger(Class<?> callingClass, String logPathIfNotAlreadySet)
{
return getConfiguredLogger(callingClass, logPathIfNotAlreadySet, Level.FINEST); // default log level
}
public static Logger getConfiguredLogger(Class<?> callingClass, String logPathIfNotA... | {
"domain": "codereview.stackexchange",
"id": 39724,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "java, logging",
"url": null
} |
beginner, android, kotlin
}
ACTIVITY_MAIN.XML
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:id="... | {
"domain": "codereview.stackexchange",
"id": 36145,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "beginner, android, kotlin",
"url": null
} |
neural-networks, reinforcement-learning, convolutional-neural-networks, recurrent-neural-networks, feedforward-neural-networks
I have read that feedforward nns have limitations regarding control flow and loops, so I'm not sure if that structure will be appropriate.
This is true, but does not impact your situation, be... | {
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"id": 2287,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "neural-networks, reinforcement-learning, convolutional-neural-networks, recurrent-neural... |
php, mysql, pdo
$DBH->commit(); //
} catch (Exception $e) {
$DBH->rollBack();
echo "Fel: " . $e->getMessage();
}
}else{
$error=1;
} Instead of checking for a UID collision before an insert, I would put a unique key on that column, and then write fallback code for the case (very very unlik... | {
"domain": "codereview.stackexchange",
"id": 273,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "php, mysql, pdo",
"url": null
} |
universe, light, speed
Title: Traversing a proton within the Planck time If I could travel a super small distance (proton) in an even smaller time (Planck time), how long would it take me to cross the observable universe? If you don't like math: A fraction of a second.
For math lovers:
One proton is $8.414 \cdot 10^{-... | {
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"openwebmath_score": null,
"tags": "universe, light, speed",
"url": null
} |
ros, pr2-controllers, pr2, callbacks
Originally posted by Guido on ROS Answers with karma: 514 on 2011-03-11
Post score: 0
Hi Guido,
ROS's spin() function is called external to the controller manager. On the PR2, it's called from pr2_etherCAT, and in Gazebo it's called from pr2_gazebo_plugins. The controller manage... | {
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"tags": "ros, pr2-controllers, pr2, callbacks",
"url": null
} |
qiskit, circuit-construction, transpile
def __init__(self):
super().__init__()
graph = rx.generators.directed_cycle_graph(5)
num_qubits = len(graph)
rng = np.random.default_rng(seed=12345678942)
rz_props = {}
rx_props = {}
ry_props = {}
measure_props = {}... | {
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "qiskit, circuit-construction, transpile",
"url": null
} |
javascript, google-chrome, ascii-art
You've got a nice separation of model, ui, controller and so forth, but perhaps a bit more encapsulation within each of those would be nice, such as abstracting/encapsulating the key-combo matching.
Semi-related: A long time ago, I wrote something to handle keyboard shortcuts. Mayb... | {
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"id": 8234,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "javascript, google-chrome, ascii-art",
"url": null
} |
falls within a specified range. To get to this menu, press: followed by. A binomial is a two-term algebraic expression. These are the coefficients of the binomial expansion and it tells us that we will have 5 terms in the expansion. * Before learning how to perform a Binomial Expansion, one must understand factorial no... | {
"domain": "calleemason.com",
"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9790357573468175,
"lm_q1q2_score": 0.8115607360678023,
"lm_q2_score": 0.8289388104343893,
"openwebmath_perplexity": 440.7888487863707,
"openwebmath_score": 0.8252242207527161,
"tags"... |
python, pandas, pivot
Title: Pivoting and then Padding a Pandas DataFrame with NaN between specific columns - Case Study This question is about pivoting and padding columns, two very frequent activities in Pandas.
I have a raw dataframe. I need to manipulate from long to wide and then pad NaN based on a specific rule.... | {
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"id": 43660,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "python, pandas, pivot",
"url": null
} |
thermodynamics, heat
In contrast, when you heat food on a stove or in a conventional oven, the only process involved is thermalization, and every molecule in the food (and pot) is equally capable of receiving energy by that process. So when you take your food off the stove, all the molecules have been completely heate... | {
"domain": "physics.stackexchange",
"id": 805,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "thermodynamics, heat",
"url": null
} |
big-bang-theory
$\dagger$In which case they're in principle not "atoms", but a plasma. However, in astronomy it's quite normal to call it atoms anyway. | {
"domain": "astronomy.stackexchange",
"id": 2073,
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"openwebmath_score": null,
"tags": "big-bang-theory",
"url": null
} |
ros, installation
Failed to fetch hxxp://packages.ros.org/ros/ubuntu/pool/main/r/ros-hydro-joystick-drivers/ros-hydro-joystick-drivers_1.9.10-0precise-20131015-2201-+0000_i386.deb Unable to connect to packages.ros.org:hxxp: [IP: 64.50.236.52 80]
E: Unable to fetch some archives, maybe run apt-get update or try with -... | {
"domain": "robotics.stackexchange",
"id": 16368,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "ros, installation",
"url": null
} |
f#, network-file-transfer
let isValidFile (fileData: seq<MultipartFileData>) =
let nameLength =
[
for x in fileData ->
x.Headers.ContentDisposition.FileName.Length
]
let fileTypeList =
[
for x in fileData ->
... | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "f#, network-file-transfer",
"url": null
} |
relative-motion, thought-experiment
A is moving and B is stationary.
B is moving and A is stationary.
A and B are both moving with some velocity from each other that could be equal or not. If A changes their velocity then you can say absolutely that A has accelerated, since acceleration is not a relative effect. That ... | {
"domain": "physics.stackexchange",
"id": 83258,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "relative-motion, thought-experiment",
"url": null
} |
quantum-mechanics, statistical-mechanics, estimation, computer, landauers-principle
computer initialized. Wikipedia tells me the Milky Way's mass is estimated to be $10^{12}$ solar masses, or about $2\times 10^{30}\times 10^{12}\times 10^{17} =2\times 10^{59}$ joules. If you can cool your computer to the temperature o... | {
"domain": "physics.stackexchange",
"id": 30931,
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"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "quantum-mechanics, statistical-mechanics, estimation, computer, landauers-principl... |
# How do I differentiate this integral?
That is:
$$\left(\int_{a(x)}^{b(x)}\!f(x,t)\,dt\right)'$$
I don't know how to differentiate a integral if functions of $x$ are at its limits.
Can you guys show me how to do this? | {
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"lm_q1q2_score": 0.8155425332039468,
"lm_q2_score": 0.8244619306896955,
"openwebmath_perplexity": 600.395962371277,
"openwebmath_score": 0.9197989106178284,
"tags... |
javascript, css, xml, library, tex
// Remove the ending parenthesis, if present.
if (algorithmParameterList[algorithmParameterList.length - 1] === ")") {
algorithmParameterList =
algorithmParameterList
.substring(0, algorithmParameterList.length - 1);
}
// Remove possible leading and trail... | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "javascript, css, xml, library, tex",
"url": null
} |
species-identification, entomology, lepidoptera
Title: What moth is this? | {
"domain": "biology.stackexchange",
"id": 7003,
"lm_label": null,
"lm_name": null,
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "species-identification, entomology, lepidoptera",
"url": null
} |
python, csv, beautifulsoup, matplotlib
Code improvements
When you're opening a file for reading, you can do:
with open(open_file) as csvfile ...
...
This will open the file in reading mode by default.
DRY(Don't repeat yourself)
Your code is really messy. I don't know how you're gonna use all of these functions. Y... | {
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"openwebmath_score": null,
"tags": "python, csv, beautifulsoup, matplotlib",
"url": null
} |
there are many examples of expressions written in terms of themselves. # depending on the problem, backtracking is not necessarily calling the # method itself directly. take more storage than their iterative counterparts. When solved, the time complexity will come to O(nLogn). 1 $\begingroup$ I tried this. Solve using ... | {
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"id": null,
"lm_label": "1. YES\n2. YES\n\n",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9539661002182845,
"lm_q1q2_score": 0.8050473124866414,
"lm_q2_score": 0.8438950947024555,
"openwebmath_perplexity": 876.3355535957812,
"openwebmath_score": 0.4719288349151611... |
c, linked-list, lock-free
void *lf_list_get(LF_List*, uint64_t);
void *lf_list_put_if_absent(LF_List*, uint64_t, void*);
int lf_list_remove(LF_List*, uint64_t);
void* lf_list_find(marked_ptr_t* head, uint64_t key, marked_ptr_t** prev, marked_ptr_t* cur, marked_ptr_t* last)
{
marked_ptr_t* tp_prev;
marked_pt... | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "c, linked-list, lock-free",
"url": null
} |
nuclear-physics, quantum-chromodynamics, chirality, pions
Indeed, Matt almost certainly means
$J^5_{\mu , +}= J^5_{\mu 1,1} +i J^5_{\mu 1,2} \propto F_\pi \partial_\mu (\pi_1 + i \pi_2) + O(\pi^2)$ in his footnote.
You could convince yourself the axial current is $\propto \Sigma^\dagger \partial_\mu \Sigma - \Sigma \p... | {
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "nuclear-physics, quantum-chromodynamics, chirality, pions",
"url": null
} |
ros, navigation, base-global-planner, move-base, ompl
Title: How to solve this problem from running a new BaseGlobalPlanner in move_base
Hi, all, I wrote a global planner by modifying this ompl_planner_base code which is based on OMPL . The original code is an old style, so I modified it to run it in Hydro successful... | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "ros, navigation, base-global-planner, move-base, ompl",
"url": null
} |
java, queue
... write `of(....)` which clones
... write `payload()` which clones
... write `withPayload()` which clones
... write `toBuilder`
}
So you need to write just 4 methods. Nice, isn't it? You lose a single feature, namely the check if all fields in the builder were set. There's a corresponding is... | {
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"lm_q2_score": null,
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"openwebmath_score": null,
"tags": "java, queue",
"url": null
} |
ros, rosdep, raspberrypi, ros-groovy, raspbian
Is it expected behavior?
Thanks!
Edit:
Full script:
pi@raspberrypi /etc $ sudo easy_install rosdep
Searching for rosdep
Best match: rosdep 0.10.15
rosdep 0.10.15 is already the active version in easy-install.pth
Using /usr/lib/pymodules/python2.7
Processing dependencies f... | {
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"openwebmath_score": null,
"tags": "ros, rosdep, raspberrypi, ros-groovy, raspbian",
"url": null
} |
php, codeigniter
public function __construct()
{
parent::__construct();
$this->data = $this->Static_model->get_static_data();
$this->data['pages'] = $this->Pages_model->get_pages();
$this->data['categories'] = $this->Categories_model->get_categories();
$this->data['posts'] =... | {
"domain": "codereview.stackexchange",
"id": 34109,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "php, codeigniter",
"url": null
} |
quantum-mechanics, hilbert-space, operators, heisenberg-uncertainty-principle
This is always true, even if the plane waves do not belong to the Hilbert space, nor to the domain of the operator $[\hat{x},\hat{p}]$, where $\hat{x}$ is the usual position operator.
Now, when we are dealing with a particle in an infinity s... | {
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"tags": "quantum-mechanics, hilbert-space, operators, heisenberg-uncertainty-principle",
... |
python, python-3.x, rest
return self._request(json={**kwargs, **{"command": "usage"}})
def availability(self, **kwargs):
required = ["broadband"]
if not any(arg in required for arg in kwargs):
raise InvalidParameters("Missing object of types: " + ", ".join(required))
return s... | {
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"openwebmath_score": null,
"tags": "python, python-3.x, rest",
"url": null
} |
machine-learning, neural-network, data-mining, deep-learning, text-mining
(1) = (cat) or ((dog) or (bird))
(2) = (young) and (dog) and (collar)
(3) = ((cat) and (old)) or ((bird) and (yellow))
What do you think will work the best? LSTM maybe? How can I have this representation as a result? Syntaxnet parser could sure... | {
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"tags": "machine-learning, neural-network, data-mining, deep-learning, text-mining",
"... |
mavros
Title: Not all topics publishing data
Hi
A few topics macros topics won't publish. But most do. I am interested in getting the topic /mavros/rc/out. However, whenever I
`$rostopic echo /mavros/rc/out'
There is no data.
I have a Pixhawk with the px4 flight stack and I am connecting it to a raspberry pi 2 runnin... | {
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"tags": "mavros",
"url": null
} |
\begin{document} This is your only binary choices \begin{math} \left\{ \begin{array}{l} 0\\ 1 \end{array} \right. Can a smartphone light meter app be used for 120 format cameras? This typically requires some creative use of an eqnarrayto get elements shifted to a new line to align nicely. \begin{eqnarray} y &=& x^4 + 4... | {
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"id": null,
"lm_label": "1. Yes\n2. Yes",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.935346511643776,
"lm_q1q2_score": 0.8579958343066884,
"lm_q2_score": 0.9173026505426831,
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"openwebmath_score": 0.8269694447517395,
... |
You can use either forms (they are equivalent) to integrate: the solution you are referring to just offers one form of the function for integrating purposes; it's not the only "correct" form of the function.
Applying the suggestions posted by by @Jonas Meyer:
\begin{align} -4\left(x + \dfrac 12\right)^2 + 4 & \;= \;4... | {
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"lm_q1_score": 0.9740426443092215,
"lm_q1q2_score": 0.8052525398988999,
"lm_q2_score": 0.826711791935942,
"openwebmath_perplexity": 297.88954692609025,
"openwebmath_score": 0.998314380645752,
"tags... |
A non zero polynomial can also have all its base set as roots!
Have a look at Math Counterexamples.
By Gauss's fundamental theorem of algebra a polynomial has number of roots equal to its degree, where roots are counted with multiplicities. So in order to have infinite roots we should consider asymptotically infinite... | {
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"lm_q1_score": 0.9597620562254525,
"lm_q1q2_score": 0.8039158583442457,
"lm_q2_score": 0.8376199633332891,
"openwebmath_perplexity": 179.20727454999047,
"openwebmath_score": 0.884517252445221,
"tag... |
javascript
// set the answer
myQuiz.answerQuestion(questionIdx, answerIdx);
// we can also get total quiz score
var totalQuizScore = myQuiz.getTotalScore();
// or we can get scores on individual questions
var question1Score = myQuiz.questions[0].getScore();
Note that the outcome here is very reusable code that coul... | {
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"id": 20564,
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"lm_name": null,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "javascript",
"url": null
} |
c++, design-patterns, memory-management, pointers, reference
#include <iostream>
int main() {
Data data{ 5 };
const View& view = data.view();
std::cout << data.value() << std::endl;
std::cout << view.value() << std::endl;
} Lesser item first:
class View {
public:
View() = delete;
View(const View&) =... | {
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"tags": "c++, design-patterns, memory-management, pointers, reference",
"url": null
} |
ros, diff-drive-controller
PURPOSE OF LIMIT ON WINDUP: At some point the integrator will become large enough that the (I*integrator) term will saturate the output of the controls. There is no value to having the integrator getting larger than that. Larger than that cannot help control the system and leads to the unwi... | {
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"id": 35648,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "ros, diff-drive-controller",
"url": null
} |
opencv, pcl, stere-image-proc
Title: Potential data loss with stereo_image_proc
Hello,
I have been messing around with the point clouds generated by stereo_image_proc for the bumblebee2 for a little bit now. I have just applied the toROSMsg command to convert my point clouds to opencv images and realized that there ... | {
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"openwebmath_score": null,
"tags": "opencv, pcl, stere-image-proc",
"url": null
} |
differentiation, vector-fields
Title: Intuitive analysis of gradient, divergence, curl I have read the most basic and important parts of vector calculus are gradient, divergence and curl. These three things are too important to analyse a vector field and I have gone through the physical meaning of gradient, divergence... | {
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"id": 31787,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "differentiation, vector-fields",
"url": null
} |
fluid-dynamics, forces
I've seen this technique used in construction of underwater tunnels and oil rigs to fix the structure in place. It is called a vacuum-anchor (e.g. Troll A platform). I want to apply it in a smaller scale. First, water at seabed pressure will also be between the sand grains in the bucket, so the ... | {
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"id": 13337,
"lm_label": null,
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"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "fluid-dynamics, forces",
"url": null
} |
thermodynamics, temperature, everyday-life, thermal-conductivity
So the heat goes from “hot object” to “mitt” to “hand” to “the rest of the human body” to “ambient air.” You need an insulator so the transfer from “hot object” to “mitt” is much slower than from “mitt” to “ambient air” (through your hand and body).
If t... | {
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"id": 71365,
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"lm_q1_score": null,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "thermodynamics, temperature, everyday-life, thermal-conductivity",
"url": null
} |
gazebo, ros-fuerte
Thank you for your time and responce. Best regards,
Neostek
Originally posted by Neostek on ROS Answers with karma: 156 on 2012-11-07
Post score: 0
Original comments
Comment by Lorenz on 2012-11-07:
Probably a question for http://answers.gazebosim.org
There's a parameter for the update rate in Fu... | {
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"tags": "gazebo, ros-fuerte",
"url": null
} |
condensed-matter, semiconductor-physics
Clarifications added in regard to the question asked by Calmarius in comments: From this answer it's still not clear to me why would the
fermi level lie in a forbidden gap. Based on what I have found on the
internet they say fermi level is the maximum energy level occupied b... | {
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"id": 76117,
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"lm_q2_score": null,
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"openwebmath_score": null,
"tags": "condensed-matter, semiconductor-physics",
"url": null
} |
control-engineering, control-theory, pid-control
Title: What's the difference between Fuzzy PI, PD and PID controllers? I am investigating fuzzy control and I am a little confused, I have come across 3 models and I can't quite fathom out what is going on.
In this PD+I controller, I can see the error signal being scal... | {
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"openwebmath_score": null,
"tags": "control-engineering, control-theory, pid-control",
"url": null
} |
quantum-field-theory, operators, hilbert-space, interactions, s-matrix-theory
\begin{equation}
a|\Omega\rangle \ne 0, \qquad a^\dagger|\Omega \rangle \ne |\Omega_1\rangle, \qquad \dots . \qquad (1)
\end{equation}
Here by $a$ and $a^\dagger$ I mean just the very same creation and annihilation operators as for harmonic ... | {
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"tags": "quantum-field-theory, operators, hilbert-space, interactions, s-matrix-theory",
... |
machine-learning, tensorflow, r, logistic-regression
dummy(type)[,-1]) %*%
c(-30,0.2,4,1,-2,3,-3)
pi <- 1/(1+exp(-linPred))
mort <- factor(rbinom(n,size = 1, prob = pi),
labels = c("Alive","Died"))
dat <- data.frame(age=age,lac=lac,wbc=wbc,
sex=sex,type=type,
... | {
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"tags": "machine-learning, tensorflow, r, logistic-regression",
"url": null
} |
Unfortunately, not only does my formula not account for rotations, but I also don't know how many solutions it will have given the number $$n$$ (combinatorics people, help!) but hopefully this is a good amount of insight to get going.
FYI: the $$n=4$$ case was checked with the following Python code:
n=4
X=(0,0,0,0)
s... | {
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"lm_q1q2_score": 0.8197487624793429,
"lm_q2_score": 0.8354835309589074,
"openwebmath_perplexity": 178.20723443988564,
"openwebmath_score": 0.862475574016571,
"tag... |
differential-geometry
$$g_{ij} = \pmatrix{1 & 0 \\ 0 & 1}$$
The connection coefficients you quote arise from the polar coordinate basis $\left\{\frac{\partial}{\partial r},\frac{\partial}{\partial \theta}\right\}$ which is not orthonormal, and in which the metric takes the form
$$g_{ij} = \pmatrix{1 & 0 \\ 0 & r^2}$$
... | {
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"openwebmath_score": null,
"tags": "differential-geometry",
"url": null
} |
# How many strings of five ASCII characters contain the character @ (“at” sign) at least once?
I'm given the question: "How many strings of five ASCII characters contain the character @ (“at” sign) at least once?"
Note: There are 128 different ASCII characters.
I realized I'd have to use rule of product and sum on t... | {
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"lm_q1_score": 0.9763105307684549,
"lm_q1q2_score": 0.8156913795570749,
"lm_q2_score": 0.8354835411997897,
"openwebmath_perplexity": 359.9241523887554,
"openwebmath_score": 0.801111102104187,
"tags... |
Since the volume is 100 cm³: . $V \:=\:\frac{1}{3}r^2h \:=\:100\quad\Rightarrow\quad h \:=\:\frac{300}{\pi r^2}$
Substitute into [1]: . $R \:=\:\sqrt{r^2 + \left(\frac{300}{\pi r^2}\right)^2} \:=\:\sqrt{r^2+\frac{90,000}{\pi^2r^4}} :=\:\sqrt{\frac{\pi^2r^6 + 90,000}{\pi^2r^4}}$
. . Hence: . $R\:=\:\frac{\sqrt{\pi^2r^... | {
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"id": null,
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"lm_q1_score": 0.9702399069145609,
"lm_q1q2_score": 0.828500228133481,
"lm_q2_score": 0.8539127510928476,
"openwebmath_perplexity": 1256.1267188937727,
"openwebmath_score": 0.908760130405426,
"tags... |
## Quickly recognizing primes less than 1000: memorizing exceptional composites
In my previous post I wrote about a procedure for testing the primality of any number less than $1000$:
1. Test for divisibility by all primes up to $13$, and also $19$. (In practice I test for 2 and 5 first, which is pretty much automati... | {
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"lm_q1_score": 0.9871787861106087,
"lm_q1q2_score": 0.8000875784508752,
"lm_q2_score": 0.8104789018037399,
"openwebmath_perplexity": 326.01854084157463,
"openwebmath_score": 0.6821288466453552,
... |
ros-melodic, ros-kinetic
Additionally:
def loop():
...
send_command_service = rospy.Service('mswrapper/send_command', SendCommand, handle_send_command)
Are you (re)creating Service servers in a loop? That's probably not something you want to do.
Originally posted by gvdhoorn with karma: 86574 on 2019-07-03
T... | {
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"openwebmath_score": null,
"tags": "ros-melodic, ros-kinetic",
"url": null
} |
0 is below the threshold 10!
1 is below the threshold 10!
2 is below the threshold 10!
3 is below the threshold 10!
4 is below the threshold 10!
5 is below the threshold 10!
6 is below the threshold 10!
7 is below the threshold 10!
8 is below the threshold 10!
9 is below the threshold 10!
10 is below the threshold 10!
... | {
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"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9683812345563902,
"lm_q1q2_score": 0.8005721856972532,
"lm_q2_score": 0.826711791935942,
"openwebmath_perplexity": 4807.1650011525335,
"openwebmath_score": 0.25303059816360474,
... |
javascript, jquery, comparative-review
This code should do the trick as well as a jsPerf test for your case #1 vs my modified code. As you can see, my Firefox 18 performs both operations equally while Chrome 23 performs better with the modified code which proves that browser implementation can make a difference.
$(fun... | {
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"openwebmath_score": null,
"tags": "javascript, jquery, comparative-review",
"url": null
} |
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