text stringlengths 1 1.11k | source dict |
|---|---|
c++, c++11, library, opengl
glGenTextures(1, &indirectionTextureId);
if (indirectionTextureId == 0)
{
vtFatalError("Failed to generate a non-zero GL texture id for the page indirection texture!");
}
gl::use2DTexture(indirectionTextureId);
// Create/set all the mip-levels:
for (int l =... | {
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "c++, c++11, library, opengl",
"url": null
} |
python, python-3.x
if stream == 'video':
if field == 'duration':
return str(convert_time(info.get_duration(), 'hh:mm:ss'))
elif field == 'width':
return str(width)
elif field == 'height':
return str(height)
elif field == 'type':
return str... | {
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"id": 20687,
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"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "python, python-3.x",
"url": null
} |
python, optimization, game, python-3.x
def move_square(self, player, ai):
square = -1
while square < 0 or square >= 9 or self.board[square] != ' ':
if ai:
square = random.randrange(9)
else:
question = "Choose a square to place {}:".format(player.u... | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "python, optimization, game, python-3.x",
"url": null
} |
python
def create_stats():
power = roll_3d6()
cun = roll_3d6()
per = roll_3d6()
stats = [ power, cunning, personality ]
return stats
def display_stats( stats ):
print "Power: ", stats[POWER]
print "Cunning: ", stats[CUNNING]
print "Personality: ", stats[PERSONALITY]
called as:
stats ... | {
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"tags": "python",
"url": null
} |
ros, memory, roscpp
Originally posted by Leontes on ROS Answers with karma: 21 on 2016-01-19
Post score: 1
ROS does not have any special memory usage patterns that would be causing this.
The presence of memory leaks in your planning library suggests that it may also be overwriting memory elsewhere. You should check y... | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "ros, memory, roscpp",
"url": null
} |
experimental-physics, water, aerodynamics, air, density
The interesting part is, it does not matter how you enter the water—it is not really relevant (regarding being fatal) in which position you enter the water at a high velocity. And you will be slowing your speed in the water, but too quickly for your body to keep ... | {
"domain": "physics.stackexchange",
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"openwebmath_score": null,
"tags": "experimental-physics, water, aerodynamics, air, density",
"url": null
} |
electrostatics, energy, electric-fields, capacitance
This last part made no sense to me,the energy supplied is to do the work and the energy goes into the capacitor.
Much like the gravitational pull of the the earth attracts a particle if we increase its height by $h$ (potential increases) and the energy is stored in ... | {
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"lm_q2_score": null,
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"openwebmath_score": null,
"tags": "electrostatics, energy, electric-fields, capacitance",
"url": null
} |
java, object-oriented, number-guessing-game
/* (non-Javadoc)
* @see com.tn.jar.Player#playGameAsPlayer()
*/
@Override
public void playGameAsPlayer() {
Prompter.printTitle("Player");
jar = new Jar();
startGame();
}
/* (non-Javadoc)
* @see com.tn.jar.Admin#playGam... | {
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"id": 20894,
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"lm_name": null,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "java, object-oriented, number-guessing-game",
"url": null
} |
quantum-mechanics, momentum, relativity
thus there is no (straightforward) analogue for the energy operator $E$ to the commutation relation $[x,p]=i\hbar$
"The quantum mechanical wave function is NOT a physical wave. it doesn't "store energy". It acts as a wave because it is a solution to a wave equation, but it is n... | {
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "quantum-mechanics, momentum, relativity",
"url": null
} |
ros, ros2, colcon
# Default to C++17
if(NOT CMAKE_CXX_STANDARD)
set(CMAKE_CXX_STANDARD 17)
endif()
You should not need to change anything there.
To see what's happening, you could try to see what Colcon CMake is actually executing with:
colcon build \
--event-handlers console_direct+ \
--cmake-args \
-DCMA... | {
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"openwebmath_score": null,
"tags": "ros, ros2, colcon",
"url": null
} |
spectroscopy, optics, very-large-telescope
Title: What is a pupil slicer, and how does it work with anamorphic optics in VLT's ESPRESSO Echelle spectrograph? This excellent answer points to ESPRESSO, - Echelle SPectrograph for Rocky Exoplanets and Stable Spectroscopic Observations. From there I looked at the Instrumen... | {
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"openwebmath_score": null,
"tags": "spectroscopy, optics, very-large-telescope",
"url": null
} |
ros-groovy, ros-hydro
Originally posted by liborw on ROS Answers with karma: 801 on 2013-06-27
Post score: 0
Personally I think that depends on your reasons for the upgrade in general. Hydro should be released by the end of July (29th) unless there are further delays, so you'd be waiting just about a month longer.
If... | {
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"openwebmath_score": null,
"tags": "ros-groovy, ros-hydro",
"url": null
} |
(*"Number" in the sense of "element of the extended real line")
Since every real number $x$ is an upper bound for $\emptyset$, $x \ge \sup \emptyset$ for all $x\in \Bbb R$. Therefore $\sup \emptyset = -\infty$. Similar reasoning gives $\inf \emptyset = +\infty$.
If we look at the definition of supremum:
We say that ... | {
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"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9755769092358046,
"lm_q1q2_score": 0.8212656669325317,
"lm_q2_score": 0.8418256512199033,
"openwebmath_perplexity": 134.92014826396138,
"openwebmath_score": 0.923119843006134,
"tag... |
quantum-mechanics, atoms, quantization
One must separate the explanations in the Bohr model from those in the proper quantum mechanics; they're inequivalent because the models are inequivalent, too. And it doesn't make too much sense to think about the origin of the conditions in the Bohr model because the Bohr model ... | {
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"tags": "quantum-mechanics, atoms, quantization",
"url": null
} |
• John Baez says:
I’m not assuming that Tom and Lisa are having children with each other: they are two separate people, each pursuing their own separate agenda with their own spouse, each assuming their spouse will knuckle under and go along with their insane plan.
Nonetheless you can still think of it as a game, whe... | {
"domain": "wordpress.com",
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"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9828232869627774,
"lm_q1q2_score": 0.8624046110592909,
"lm_q2_score": 0.8774767778695834,
"openwebmath_perplexity": 1206.523883410803,
"openwebmath_score": 0.7304139733314514,
"tags": ... |
c#, design-patterns, stored-procedure
As you can see, I have opted for a fluid API which has methods which describe how to prepare the object, a method which will then execute the procedure, and a property to retrieve any results if they were returned.
Does this class now clearly reveal and express its intent? If not,... | {
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "c#, design-patterns, stored-procedure",
"url": null
} |
java, swing
MessagesBundleTest.java
package com.singularityfx.passgen;
import java.util.Arrays;
import java.util.Collection;
import java.util.Locale;
import java.util.ResourceBundle;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.Parameterized;
/**
* Checks if messages bundles for... | {
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"id": 10101,
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"openwebmath_score": null,
"tags": "java, swing",
"url": null
} |
$\TeX$ code Result preview + $+$ \cdot $\cdot$ \gtrdot $\gtrdot$ x \pmod a $x \pmod a$ - $-$ \cdotp $\cdotp$ \intercal $\intercal$ \land $\land$ / $/$ \centerdot $\centerdot$ \centerdot $\centerdot$ \rhd $\rhd$ * $*$ \circ $\circ$ \leftthreetimes $\leftthreetimes$ \rightthreetimes $\rightthreetimes$ \amalg $\amalg$ \ci... | {
"domain": "calculla.com",
"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9724147161743552,
"lm_q1q2_score": 0.8060722939650908,
"lm_q2_score": 0.828938806208442,
"openwebmath_perplexity": 10316.063277768013,
"openwebmath_score": 1.0000098943710327,
"tags": n... |
homework-and-exercises, electromagnetism, induction
It's a simple application of KVL. Assuming ideal circuit elements, if there is a voltage source $V_{AC}$connected to the primary, KVL yields
$$V_p = V_{AC}$$
But it is also the case that
$$V_p = N_p \frac{\mathrm d\Phi}{\mathrm dt}$$
Thus, it must be that
$$\frac{\m... | {
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"tags": "homework-and-exercises, electromagnetism, induction",
"url": null
} |
24, 25 Homework Help Interior Angles of Regular Polygons Find the measure of an interior angle of the regular polygon. Polygon Questions and Answers - Math Discussion. The Area of a Trapezoid [1/27/1996] My daughter has been assigned to derive the formula for the area. Use your knowledge of the sums of the interior and... | {
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"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9845754501811437,
"lm_q1q2_score": 0.8655863321899627,
"lm_q2_score": 0.8791467754256018,
"openwebmath_perplexity": 683.6335121365421,
"openwebmath_score": 0.30508238077163696,
"tags"... |
star, orbit, black-hole, orbital-mechanics
$^1$ Of course that is the speed as seen by a distant observer. If you were to go there and put a speed gun on it as it went past, then it would be a touch larger. | {
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python, beginner, algorithm, primes, homework
if pow(test_num, possible_prime-1) % possible_prime != 1:
# test_num is a Fermat witness, possible_prime composite
return True
# possible_prime may be prime
return False
if __name__ == '__main__':
import doctest
doctest.testmod()
main(... | {
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• That was my solution as well (as you can probably see in the deleted answer below). However, I had some doubts on it, in particularly with the numerator. – barak manos Nov 1 '16 at 11:29
• @barak manos I'm answering on mobile which doesn't seem to show deleted answers. What doubts do you have? – Mathily Nov 1 '16 at ... | {
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"openwebmath_perplexity": 396.5355610042156,
"openwebmath_score": 0.965787947177887,
"tags... |
ros2
export ADE_DOCKER_RUN_ARGS="--cap-add=SYS_PTRACE --runtime=nvidia -ti --rm -e DISPLAY -v /tmp/.X11-unix:/tmp/.X11-unix \
-e NVIDIA_VISIBLE_DEVICES=all \
-e NVIDIA_DRIVER_CAPABILITIES=compute,utility,display" | {
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"tags": "ros2",
"url": null
} |
In this paper Baez, Fritz, and Leinster use convexity and logarithm functions. If $R$ is an arbitrary ring we can replace $[0, 1] \subseteq \mathbb{R}$ with a subset $C \subseteq R$ that satisfies
1. We have $0, 1 \in C$.
2. For all $c, c_{0}, c_{1} \in C$ we have $c c_{0} + (1 - c) c_{1} \in C$.
The set $C$ will wor... | {
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"lm_q1_score": 0.9748211531789392,
"lm_q1q2_score": 0.8246425784739293,
"lm_q2_score": 0.8459424334245618,
"openwebmath_perplexity": 115.83240582311004,
"openwebmath_score": 0.974520206451416,
"tag... |
c#, csv
foreach (string file in files)
{
string fileName = Path.GetFileName(file);
string findText = ".0 index";
string match = @"(\.\d index)|(\.\d\.label)|(\.\d\.value)";
StreamReader reader = new StreamReader(file);
string... | {
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"tags": "c#, csv",
"url": null
} |
-
I don't think I've seen it in here:
Every vector space has a non-trivial dual space ($L^p$ for $0 < p < 1$ was a counter-example only mentioned during one of the classes in measure theory)
And of course there's the common false belief of people outside of mathematics that "mathematicians work with numbers and form... | {
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"lm_q2_score": 0.8670357649558006,
"openwebmath_perplexity": 347.372224911955,
"openwebmath_score": 0.8915233016014099,
"tags"... |
full confidence. May, 23, 2012. In physics, when you calculate an object’s moment of inertia, you need to consider not only the mass of the object but also how the mass is distributed. The location of the centroid using the method of composite bodies. Question: a. Determine the moment of inertia and radius of gyration ... | {
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"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9899864296722662,
"lm_q1q2_score": 0.8093876454789207,
"lm_q2_score": 0.8175744850834648,
"openwebmath_perplexity": 484.2467828558053,
"openwebmath_score": 0.5768759846687317,
"tags": null,
... |
experimental-physics, higgs
Title: Is it THE Higgs? Can anyone brief me, about the status of the Higgs boson discovery and verification at CERN?
Specificaly is it A higgs or THE higgs?
If it is A higgs, where exactly does it differ from THE higgs?
Or whatelse needs be verified for it to be THE higgs? | {
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"tags": "experimental-physics, higgs",
"url": null
} |
5-12-2012В В· This is the third in a sequence of tutorials about continuous random variables. I explain how to calculate the mean (expected value) and variance of a continuous random variable. Tutorials on continuous random variables a continuous random variable (RV) Probability density function (pdf) A curve, symbol f... | {
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"lm_q1q2_score": 0.8214210689290479,
"lm_q2_score": 0.8499711832583695,
"openwebmath_perplexity": 529.2598044826451,
"openwebmath_score": 0.8881303071975708,
"tags":... |
You can try this by "chunks". Since $\;24=4\cdot6\;$ and clearly $\;4\;$ is the square of $\;2\;$ , we can concentrate on $\;6\;$...and we're in luck since
$$6=256\pmod{125}=6+2\cdot125$$
So that $\;16^2=6\pmod{125}\;$ , and finally
$$(32)^2=2^216^2=4\cdot6=24\pmod{125}$$
• i.e. $\ \sqrt{4\cdot 6} \,=\, 2\sqrt{6}\,... | {
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"lm_q1q2_score": 0.8476320440233998,
"lm_q2_score": 0.8652240895276223,
"openwebmath_perplexity": 348.0788926276747,
"openwebmath_score": 0.9173611402511597,
"tag... |
black-holes, thermal-radiation, hawking-radiation
For our initial numbers, this gives you $8\cdot 10^{33} \rm yr$. So it comes out to be an extremely dim light bulb that will be around for an unimaginably long time.
For fun: a black hole the mass of the Empire State building would last for thirty years and would start... | {
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"tags": "black-holes, thermal-radiation, hawking-radiation",
"url": null
} |
• I think Sal may have left something out. Correct me if I'm wrong, but on certain occasions, the entire function does not have to be continuous. If it is continuous at the value, a, then it should be fine to use direct substitution even though the function might be undefined elsewhere. This is because it isn't undefin... | {
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"lm_q1_score": 0.9888419684230912,
"lm_q1q2_score": 0.8519251318545814,
"lm_q2_score": 0.86153820232079,
"openwebmath_perplexity": 365.88969269845984,
"openwebmath_score": 0.8613227605819702,
"tags":... |
quantum-field-theory, special-relativity, quantum-spin, fermions, classical-field-theory
The relevant thing to look up if you can be bothered is "Wigner's classification" of the irreducible representations of the Poincare group. Essentially, the different particles of different spin transform as irreducible representa... | {
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"tags": "quantum-field-theory, special-relativity, quantum-spin, fermions, classical-field-... |
ros, ros2, root, node, sudo
Has anyone done something like that? Is there any step that I'm missing?
Googling doesn't really show up anything helpfull.
Originally posted by MAB Jakub on ROS Answers with karma: 33 on 2021-11-22
Post score: 0
Hi,
If you run a node with sudo it can only communicate with other nodes if ... | {
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"tags": "ros, ros2, root, node, sudo",
"url": null
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c#, .net, asp.net
public SessionRepository SessionRepo { get { return sessionRepo.Value; } }
I don't see any reason to shorten "repository" to "repo" here, SessionRepository is not that long.
public void Dispose()
{
if (connection.IsValueCreated)
{
try
{
if (connection.Value.State... | {
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"openwebmath_score": null,
"tags": "c#, .net, asp.net",
"url": null
} |
java, beginner, swing, hangman
/* Find first empty position in array of entered letters (one with code \u0000) */
public static int findEmptyPosition(char[] enteredLetters) {
int i = 0;
//This for loop goes through all the elements inside the function and it is used to find the first empty space ... | {
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"tags": "java, beginner, swing, hangman",
"url": null
} |
performance, csv, vb.net
</div>
<div class='emp-info'>
<div class='row-fluid'>
<p class='name'>
John Doe
<div class='prefname'>
</div>
</p>
<p class='title'>
House Cleaning
<a href="#">External (8725)</a>
</p>
<div class='row-fluid'>
<p class='email'>
<a href="mailto:johndoe@mysite.com... | {
"domain": "codereview.stackexchange",
"id": 15267,
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"tags": "performance, csv, vb.net",
"url": null
} |
human-biology, endocrinology, mammals
Our data support the thesis that mammotropic hormones, particularly estrogen, are harmful because they suppress the immune system. Heavy women with high levels of body fat produce more estrogen and, therefore, bigger breasts. However, more estrogen leads to an increase in breast a... | {
"domain": "biology.stackexchange",
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"lm_q2_score": null,
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"openwebmath_score": null,
"tags": "human-biology, endocrinology, mammals",
"url": null
} |
human-anatomy, cardiology
Title: Structure separating the left atrium from the ascending aorta? With reference to the (adult) anatomy of the human heart:
The left atrium (LA) and the proximal part of the ascending aorta (Ao) abut one another, as shown nicely in this image [1]. Is there a name for the wall(s) separati... | {
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"openwebmath_score": null,
"tags": "human-anatomy, cardiology",
"url": null
} |
java, algorithm, random
one value will be a
the remaining 9 will be b
the a value should be randomly distributed among the b values.
The problem you have is with the random distribution. Your code does this:
it creates 2 buckets, one for a with frequency 1, one for b with frequency 9.
it then does a random selection... | {
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"openwebmath_score": null,
"tags": "java, algorithm, random",
"url": null
} |
python, beginner, algorithm, object-oriented, hash-map
def remove_key(self, key):
key_var = self.__get_hash_mod_size(key)
if self.hashmap_data[key_var] is not None:
return False
for i in range(len(self.hashmap_data[key_var])):
if self.hashmap_data[key_var][i][0] == key:... | {
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"id": 35518,
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"openwebmath_score": null,
"tags": "python, beginner, algorithm, object-oriented, hash-map",
"url": null
} |
quantum-chemistry, computational-chemistry
That covers the question of charges based on $N(\Omega)$, but this does not actually give us a picture of how electrons are shared between atoms. In other words, how localized and how delocalized are the electrons? In order to answer this question, ref. [3] provides definiton... | {
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"tags": "quantum-chemistry, computational-chemistry",
"url": null
} |
javascript, algorithm, time-limit-exceeded, sliding-tile-puzzle, a-star
These numbers are calculated by hashing function.
Previously I kept states in arrays, but changing to numbers gave me more memory and speed.
I can solve puzzle from example above with minH = 4 in 0.1 s, but I see if I want to get next state with l... | {
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"openwebmath_score": null,
"tags": "javascript, algorithm, time-limit-exceeded, sliding-tile-puzzle, a-star",
"ur... |
mathematical-physics, semiconductor-physics
Title: Taylor approximation in physics In a textbook about semicoductor physics, I came across a passage about deriving the carrier concentration at thermal equilibrium in semiconductors I didn't quite grasp:
The recombination $R(T,n,p)$ rate depends on the ionization energ... | {
"domain": "physics.stackexchange",
"id": 1929,
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"tags": "mathematical-physics, semiconductor-physics",
"url": null
} |
2 3 = 8. Multiplying Complex Numbers Calculator. Binary addition is the simplest method to add any of the binary numbers. Addition Worksheet A :. Let’s add two binary numbers to understand the binary addition. So a binary matrix is such an array of 0's and 1's. A, 1 is entered in its position that yields 1000 since 2 3... | {
"domain": "fotoclubtiendeveen.nl",
"id": null,
"lm_label": "1. YES\n2. YES\n\n",
"lm_name": "Qwen/Qwen-72B",
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"openwebmath_perplexity": 665.2859832549126,
"openwebmath_score": 0.703130841255188,... |
special-relativity, group-theory, representation-theory, rotation, lie-algebra
as
$$SO(3)~\ni~R~\stackrel{\Phi}{\mapsto}~ \Lambda ~=~ \left[\begin{array}{cc}1 & 0 \cr 0 &R \end{array} \right]~\in~ O(1,3).$$
It is not hard to see that this embedding $\Phi:SO(3)\to O(1,3)$ is an injective group homomorphism
$$\Phi(R_... | {
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"tags": "special-relativity, group-theory, representation-theory, rotation, lie-algebra",
... |
context-free, pumping-lemma
Let $k$ be the constant of the Pumping lemma and $m > k$ and $m > 42$. So $z = a^{m^2\cdot\sqrt{m^2}} = a^{m^3} \in L'$.
$|z| = |uvw| = m^3 ...$
How to continue? You're off to a good start. You recognize that all you have to do is show that the language $L'$ isn't regular. You let $k$ be t... | {
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"openwebmath_score": null,
"tags": "context-free, pumping-lemma",
"url": null
} |
radio-telescope, black-hole, radio-astronomy
of temporal overlap in visibility of Sgr A∗ with the mm-wave telescopes in the Americas, the western-most site, Mt. Gamsberg (2,347 m a.s.l.) in Namibia has been chosen as the primary site
for further investigations. Additional supporting arguments for this site are that ... | {
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"tags": "radio-telescope, black-hole, radio-astronomy",
"url": null
} |
as columns $$\left( \begin{array}{rrrr} 1&-1&-1&-1 \\ 1& 1&-1&-1 \\ 1&0 &2&-1 \\ 1&0&0&3 \end{array} \right)$$ Pattern, done correctly, works in any dimension
$$\left( \begin{array}{rrrrrrrrrr} 1 & -1 & -1 & -1 & -1 & -1 & -1 & -1 & -1 & -1 \\ 1 & 1 & -1 & -1 & -1 & -1 & -1 & -1 & -1 & -1 \\ 1 & 0 & 2 & -1 & -1 & -1 &... | {
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"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9773708006261044,
"lm_q1q2_score": 0.8526068455261008,
"lm_q2_score": 0.8723473680407889,
"openwebmath_perplexity": 495.77803505708044,
"openwebmath_score": 0.8482692837715149,
"ta... |
c#, delegates
if (arrivingFlights.ToList().Count == 0)
{
var flightInQueue = _schedule.FirstOrDefault(x => x.DepartureTime == _schedule.Min(c => c.DepartureTime));
if (flightInQueue != null && flightInQueue.Number == flight.Number)
{
return true;
... | {
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"tags": "c#, delegates",
"url": null
} |
ros, rviz, markers.rviz
Originally posted by pallyra1 on ROS Answers with karma: 51 on 2018-01-12
Post score: 0
Original comments
Comment by mgruhler on 2018-01-12:
Please state more clearly what your Problem is.
Don't you understand what this means or is there a Problem with the build?
Comment by pallyra1 on 2018-01... | {
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"tags": "ros, rviz, markers.rviz",
"url": null
} |
discrete-signals, linear-systems, frequency-response
But this will be wrong thing to do, because the difference equation represents a Causal System, since the current output sample depends only on current input sample and a past output sample. | {
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"tags": "discrete-signals, linear-systems, frequency-response",
"url": null
} |
atmosphere, climate-change, geoengineering
The cited references are:
Robock, A., Oman, L. & Stenchikov, G. L. Regional climate responses to geoengineering with Tropical and Arctic SO2 injections. J. Geophys. Res. 113, D16101 (2008).
MacCracken, M. C. On the possible use of geoengineering to moderate specific climate... | {
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"tags": "atmosphere, climate-change, geoengineering",
"url": null
} |
Chain Rule, including the proof that the composition of two difierentiable functions is difierentiable. 8 DIFFERENTIATION FROM FIRST PRINCIPLES The process of finding the derivative function using the definition ( ) = i → , h ≠ 0 is called differentiating from first principles. Incidentally, this also happens to be the p... | {
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"openwebmath_score": 0.8013216853141785,
"... |
But what I think that you are saying is that the denominator has nothing to do with it. It's that $\lim_{x\to \infty } \cos^4(x)$ can be shown to be zero by using the squeeze theorem.
No, it doesn't. The constant function f(x)= 1/2 is always between 0 and 1- does that "force" its limit to be 0?
$\lim_{x\to\infty} cos^4... | {
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"lm_q2_score": 0.888758801595206,
"openwebmath_perplexity": 138.18012348820477,
"openwebmath_score": 0.9781644940376282,
"tag... |
javascript, react.js, api
I tried to optimize for user experience by always having two messages available, so that when the user clicks 'next', there already is a message to display and no waiting time. These are currentMessage and nextMessage.
I used two useState hooks as I found looping inside of a useEffect hook wh... | {
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"tags": "javascript, react.js, api",
"url": null
} |
c++, game
That will just work, and it will be much smaller, and much faster to iterate over:
// there are many different ways to iterate over the inventory
// an in-place visitor (good for simple stuff, or where the behaviour is the
// same for all item types):
for (auto&& item : inventory)
std::cout << std::visi... | {
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"tags": "c++, game",
"url": null
} |
python, django
try:
producto = Product.objects.get(pk=product_id)
if titulo != "":
producto.titulo = titulo
if titulo != "":
producto.slug = slugify(titulo)
if image != "":
producto.image = image
if price != "":
producto.price = price
if wholesale_price != "":
... | {
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"openwebmath_score": null,
"tags": "python, django",
"url": null
} |
quantum-computing, circuits
So first, let's focus on reversible classical computing: we force all gates to be reversible, but don't worry about qubits yet. By the pigeonhole principle, we see that each gate must have at least as many output bits as it has input bits.
For one input bit and one output bit, there are onl... | {
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"openwebmath_score": null,
"tags": "quantum-computing, circuits",
"url": null
} |
Bound of the Variance When a Random Variable is Bounded. The eigenvalues of a symmetric matrix are real. is an eigenvalue of A => det (A - I) = 0 => det (A - I) T = 0 => det (A T - I) = 0 => is an eigenvalue of A T. Note. For part (b), note that in general, the set of eigenvectors of an eigenvalue plus the zero vector ... | {
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"lm_q1_score": 0.9566341999997378,
"lm_q1q2_score": 0.8361721703239672,
"lm_q2_score": 0.8740772286044095,
"openwebmath_perplexity": 528.2495127282442,
"openwebmath_score": 0.8579239845275879,
"tags"... |
gazebo, laser, ros-kinetic
Title: Gazebo Hokuyo laser not working properly
Hi all,
I´m trying to run some mapping experiments with a mobile robot on a Ubuntu 16.04 machine with ROS Kinetic and Gazebo 7.
What I did was to define a diff-drive with the following urdf:
https://github.com/JoseJaramillo/lucrezio_simulation... | {
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"tags": "gazebo, laser, ros-kinetic",
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} |
cmake
edit 2
cpp
#include < ros/ros.h>
int main(int argc, char **argv)
{
ros::init(argc,argv,"hello_ros");
ros::NodeHandle nh;
ROS_INFO_STREAM("HEllo ROS"):
}
CMakeLists.txt
cmake_minimum_required(VERSION 2.8.3)
project(agitr)
find_package(catkin REQUIRED COMPONENTS roscpp)
catkin_package()
include_directories(include... | {
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} |
-
you mean that "$-9$ is the multiplicative inverse of $-3$". – Lubin Sep 10 '12 at 6:51
@Lubin: I do indeed; thanks for catching the typo. – Brian M. Scott Sep 10 '12 at 6:52
Here is one way to find the inverse. First of all, $23$ has an inverse in $\mathbb{Z} / 26 \mathbb{Z}$ because $gcd(26,23) = 1$. So use the E... | {
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"openwebmath_score": 0.8266187906265259,
"tag... |
organic-chemistry, reaction-mechanism, regioselectivity, nitriles
Footnote: As an aside at this point, it's important to realise that these are not fully covalent bonds (in $\ce{AgCN}$ and $\ce{KCN}$), despite having some level of covalent character. We're somewhat bastardising the Winstein model of nucleophilic subst... | {
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"tags": "organic-chemistry, reaction-mechanism, regioselectivity, nitriles",
"url": null... |
draw the vertical line through x = 4 to accidentally mismatch the x-values and y-values written-out answer! ; distance = d the point B ( x2, y1 ) is at (,... Drawn between these two points the numbers properly, -2 ) and ( 1, 1.. And ⦠formula Examples sure you 've paired the numbers properly in other words, I have pr... | {
"domain": "maconneriemariopasquale.com",
"id": null,
"lm_label": "1. YES\n2. YES\n\n",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9591542840900507,
"lm_q1q2_score": 0.8333389261898744,
"lm_q2_score": 0.8688267779364222,
"openwebmath_perplexity": 731.5304579916493,
"openwebmath_score": 0.6780861020... |
java, numerical-methods
public MonteCarloPiComputer() {
this(new Random());
}
/**
* Computes an approximate value of Pi via a Monte Carlo method. The method
* creates {@code samples} random points in the upper-right quadrant,
* computes the fraction of all points within the radius from ... | {
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"id": 29551,
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"openwebmath_score": null,
"tags": "java, numerical-methods",
"url": null
} |
If a unique function is continuous on 0 to ∞ limit and also has the property of Laplace Transform. Example: Complex Conjugate Roots (Method 2) Method 2 - Using the second order polynomial . This function is therefore an exponentially restricted real function. = $\frac{3s}{s^{2} + 25}$ + $\frac{2}{s^{2} + 25}$, = $3. \f... | {
"domain": "wolfpacknyc.com",
"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9572778000158575,
"lm_q1q2_score": 0.8383714508542798,
"lm_q2_score": 0.8757869981319863,
"openwebmath_perplexity": 11396.313708180473,
"openwebmath_score": 0.7313063144683838,
"tags... |
reference-request, cr.crypto-security, circuit-complexity, boolean-functions, black-box
A variant of this problem is that we only require the machine to be correct with a probability that is significantly higher than $1/2$. In other words, does $BBB \in PP$?
Third question: $PSPACE$. Can this possibly be solved in pol... | {
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"openwebmath_score": null,
"tags": "reference-request, cr.crypto-security, circuit-complexity, boolean-functions, blac... |
error-analysis, statistics
for $a^n=Q$, where $\text{d}a$ and $\text{d}Q$ represent the error of $a$ and the error of $Q$,
$$dQ= |Q||n|\bigg(\frac{\text{d}a}{a}\bigg)$$
and for a constant raised to a variable as in:
for $e^a=Q$, where e is a constant, a is a variable with an known error (d$a$) and $Q$ is the resultant... | {
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"tags": "error-analysis, statistics",
"url": null
} |
python, performance, random, numpy, combinatorics
Writing for w in range(r): is misleading, because w is not actually used (it's immediately overwritten by the random sample). It's conventional to write _ for unused loop variables.
The code uses NumPy to do the statistics on the sample. But there are at most 400 lette... | {
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"tags": "python, performance, random, numpy, combinatorics",
"url": null
} |
terminology, data-structures, runtime-analysis, binary-trees
Title: Best-Case Running Time For Binary Search Tree Insertion The notion of best-case running time is kind of ambiguous for me. According to wikipedia, the definition of best case running time is:
The term best-case performance is used in computer science ... | {
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"openwebmath_score": null,
"tags": "terminology, data-structures, runtime-analysis, binary-trees",
"url": null
} |
quantum-mechanics, angular-momentum, quantum-spin
Title: Angular momentum commutation relations? Does any operator $\mathbf{T} = (T_1,T_2,T_3)$ that satisfies the commutation relations $[T_i, T_j] = i\hbar\epsilon_{ijk}T_k$ represent an angular momentum operator? No.
The commutation relation merely means that the $T_i... | {
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"tags": "quantum-mechanics, angular-momentum, quantum-spin",
"url": null
} |
material-science
Title: How can I get some conductive polymer (silicone like), with 1 Ohm/cm resistance? I'm looking for a silicone-like (flexible, stretchable) conductive polymer with 1 ohm/cm resistance. Does anyone happen to know where/how can I acquire some?
Thank you very much for your time. I guess you mean "sil... | {
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"tags": "material-science",
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general-relativity, metric-tensor
Title: Does anyone recognize the line element $ds^2 = ( 1 - \frac{2m}{r} )dt^2 + 2 dt dr$? I've stumbled upon the line element $ds^2 = ( 1 - \frac{2m}{r} )dt^2 + 2 dt dr$. Obviously the corresponding metric tensor has components:
$\begin{bmatrix} g_{tt} & g_{tr} \\ g_{rt} & g_{rr} \en... | {
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"tags": "general-relativity, metric-tensor",
"url": null
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electric-circuits, electricity, electric-current
So, how is the circuit complete if there is no net flow of electrons through the wire? I like to use the analogy of a full water hose with a hand-held nozzle on the end of it. When you squeeze the handle on the nozzle, the first drop of water coming out the end of the... | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "electric-circuits, electricity, electric-current",
"url": null
} |
pressure, water, estimation, buoyancy, biology
The human body's density is relatively close to that of water; a common figure is 985g/liter, vs 1000 g/liter for fresh water and 1020 g/liter for sea water. That's only 3.5% less dense than sea water, so if compressing air in their lungs can reduce the overall body volu... | {
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"tags": "pressure, water, estimation, buoyancy, biology",
"url": null
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python, python-3.x
def setSpreadsheet(self, name=None, spreadsheetId=None):
if(name):
spreadsheetId = self.getSpreadsheet(name)
if(spreadsheetId and self.spreadsheetId != spreadsheetId):
logger.debug(f'Setting spreadsheetId to [{spreadsheetId}]')
self.spreadsheetId =... | {
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I presume you're treating $$z^{4/3}$$ as a multivalued function, and you're allowing any $$z$$ such that any branch of $$z^{4/3}$$ is $$2$$. By definition, $$z^{4/3} = \exp((4/3) \log(z))$$ where $$\log(z)$$ is any branch of the logarithm of $$z$$. If $$\text{Log}(z)$$ is the principal branch (with imaginary part in $$... | {
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"id": null,
"lm_label": "1. YES\n2. YES",
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"tag... |
I = S[ 1:(nrow(S) – 1), which.min(S[ nrow(S), ])]
1. indeed, sorry
I made a quick copy and paste with some small changes.. as always, there are some typos…
thanks François !
1. No problem at all.
I discovered the bug because I wanted to rewrite your code with ggplot2 and any number of clusters. Not sure how to do th... | {
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"lm_q2_score": 0.853912754810561,
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"openwebmath_score": 0.7124113440513611,
"tags": ... |
permutes list l according to permutation p. Sets can. C has a function (next_permutation()), that modifies permutation (parameter) to next permutation (lexicographically greater), if such permutation exists is function return value is true, false otherwise. We have shared the PHP program to find smallest permutation of... | {
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"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9719924826392581,
"lm_q1q2_score": 0.8078647945161651,
"lm_q2_score": 0.8311430478583168,
"openwebmath_perplexity": 563.5830429954628,
"openwebmath_score": 0.568350076675415,
"tags": null... |
## 1 Answer
This is a bit problem-specific, but this trick appears to work. Suppose $x_0=a 21^{1/3}$ for some $a>0$. Then $x_1=21^{1/2} a^{-1/2} 21^{-1/6}=a^{-1/2} 21^{1/3}$. Can you now solve the recurrence by induction? What does your solution tell you?
As for trying to do something more general, I think you might ... | {
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"openwebmath_score": 0.9153982996940613,
"tag... |
measurement, error-correction, stabilizer-code, stabilizer-state
The thing that is disturbing me occurs when an element $g_i$ anti-commutes with a $\widetilde{g}_j$. We could naïvely believe that $g_i$ cannot be in $S'$ and we could completely discard it. But it could occur that $g_i g_l$ commutes with all the family ... | {
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"url"... |
thermodynamics, radioactivity, convection
$$ \Gamma = \frac{2\pi}{\hbar}|M|^2\rho(E_f) $$
$M$ is the amplitude for the process, which is based on fundamental physics coupling, it is not a function of environment.
The density of states, $\rho(E_f)$, describes the availability of final state decay products with energy $... | {
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"tags": "thermodynamics, radioactivity, convection",
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} |
# Nice Puzzle
#### Amer
##### Active member
Arrange the numbers: 1,2,3,4,5,6,7,8,9,10,11,12,13,14,15
such that the summation of each two successive numbers is a complete square easy interesting question
#### MarkFL
Staff member
8, 1, 15, 10, 6, 3, 13, 12, 4, 5, 11, 14, 2, 7, 9
#### Bacterius
##### Well-known memb... | {
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cc.complexity-theory, algebraic-complexity
$(2)$ Is this a valid argument? No, the bit complexity of matrix multiplication on $M$-bit entries is $n^{\omega} (\log n)^{O(1)} \cdot M (\log M)^{O(1)}$, where $\omega < 2.4$ is the best known matrix multiplication exponent. Multiplication and addition of $M$-bit numbers ca... | {
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"url": null
} |
php, ip-address
return array_map('intval', $parts);
}, explode('.', $rangeString));
Provided the user put in a syntactically correct range $range will be an array containing 4 arrays with two integers (start and each of the range) each. We can now check each part. I put a not around the whole expression in the if... | {
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"tags": "php, ip-address",
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quantum-mechanics, solid-state-physics, semiconductor-physics, electronic-band-theory, nanoscience
At the left is a metal. By definition, a metal has no band gap. So only the Fermi Level is shown.
In the middle (circled in green) is an insulator. The difference between an insulator and a semiconductor is kind of arbit... | {
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$11010$ has $0$ consecutive digit changes (because its rightmost digit is a $0$), so you switch $1$ digit to get its successor $11011$. Then, there is $1$ change, so you get $11000$ and so on.
Define $f$ and $g$ recursively on strings of binary digits by :
$f(x0) = x1 , f(x1) = g(x)0 \\ g(x0) = f(x)1, g(x1) = x0$
You... | {
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"lm_q1_score": 0.9777138170582866,
"lm_q1q2_score": 0.8126200397983273,
"lm_q2_score": 0.831143045767024,
"openwebmath_perplexity": 314.71096357601976,
"openwebmath_score": 0.767068088054657,
"tags... |
python, performance, algorithm, search
My 5 year old laptop finds teams of 5 from 100 people in 02:08.887 ... well under the 10 minutes you're experiencing on your "state of the art computer". That isn't a really good, qualitative performance comparison, so you'll have to profile it to see how much of an improvement ... | {
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"openwebmath_score": null,
"tags": "python, performance, algorithm, search",
"url": null
} |
complexity-theory
Jansen and Santhanam showed that if PIT is in $\mathsf{NSUBEXP}$ then there is a family of polynomial whose integer evaluation problem is in $\mathsf{NEXP}$ but which do not have poly-size constant-free arithmetic circuits.
Carmosino, Impagliazzo, Kabanets, and Kolokolova show that if PIT over a fixe... | {
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"openwebmath_score": null,
"tags": "complexity-theory",
"url": null
} |
newtonian-mechanics
Title: Reciprocating vs. rotating machines Why is the RPM achieved on a reciprocating machine in general lesser than that obtained in a rotating machine? For example, an IC engine typically provides an RPM of about 2500 while a turbine can go as high as 80,000 RPM. The inertia and the repetitive ch... | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "newtonian-mechanics",
"url": null
} |
quantum-mechanics, atomic-physics, hydrogen, orbitals
As you increase the energy level of a hydrogen atom $n\to\infty$ I have learned that the energy of that energy level decreases...
When a negative quantity gets less negative, it is increasing, not decreasing. Increasing $n$ means increasing $E_n$. A higher energy ... | {
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "quantum-mechanics, atomic-physics, hydrogen, orbitals",
"url": null
} |
general-relativity, metric-tensor, tensor-calculus, curvature, singularities
Title: How to interprete this singularity? I am calculating the Kretschmann scalar for the Schwartzchild metric. This is the graphic I get:
Where $R$ is the radial coordinate and $x=\cos(\theta)$.
So, there is the singularity at $R=0$ as it... | {
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"tags": "general-relativity, metric-tensor, tensor-calculus, curvature, singularities",
"... |
python, python-3.x, file, file-system
def mktemp(self, mode='w+b', encoding=None, suffix=''):
"""Creates and registers a named temporary
file and returns the file object.
"""
temp = self.enter_context(NamedTemporaryFile(
suffix=suffix, prefix=self.prefix, dir=self.root))
... | {
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "python, python-3.x, file, file-system",
"url": null
} |
javascript, jquery, animation
window is the default object, it is also the global scope. You don't need to use it. thus window.addEventListener('keydown', handleKeyDown) is the same as addEventListener('keydown', handleKeyDown)
JavaScript has 3 types of variables. var scoped to the function, let scoped to a block { /... | {
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"tags": "javascript, jquery, animation",
"url": null
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But ...
On one hand, 1 and 2 suggest probability of mines under 1 and 2 are the same, 1/2. However, 4 suggests probability of a mine under 2 is higher, 3/5. So, we have a difficulty - what probability should the tile have?
We quickly see that: | {
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"lm_q2_score": 0.8289388146603364,
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"openwebmath_score": 0.591291606426239,
"tags"... |
javascript, mathematics, ecmascript-6, d3.js, svg
Title: Draw sine wave going around a circle I have used d3 to draw a sine wave going around a circle. This is the very first time I've used d3 or drawn a SVG and I'm fairly new to JS as well, so I don't know if I've overcomplicated it/if there is a simpler way to achie... | {
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"tags": "javascript, mathematics, ecmascript-6, d3.js, svg",
"url": null
} |
php, html5, template, wordpress
<?php get_footer(); ?> It's quite fine. Something I don't like though is the mild overuse / abuse of isset and strlen.
Take this code for example:
$allFormPosts = array("address", "email", "xsize", "ysize", "zsize");
foreach($allFormPosts as $formPost){
if(isset($_POST[$formPost]))... | {
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"tags": "php, html5, template, wordpress",
"url": null
} |
ros, ros-electric
Originally posted by roehling with karma: 1951 on 2011-11-27
This answer was ACCEPTED on the original site
Post score: 5
Original comments
Comment by roehling on 2011-11-28:
You could limit the subscriber queue size, or even better, throw away frames which are too old based on the message timestamp.... | {
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"tags": "ros, ros-electric",
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} |
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