text stringlengths 1 1.11k | source dict |
|---|---|
molecular-biology, dna, pcr, experimental-design, enzyme-kinetics
More specifically, this is for a variation of the Surveyor Mutation detection assay, where re-annealed DNA with mismatches are digested, leaving non-mutant DNA intact. I would like to keep non-mutant plasmids for E. coli transformation. However, some li... | {
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"tags": "molecular-biology, dna, pcr, experimental-design, enzyme-kinetics",
"url": null
} |
performance, regex, posix
Title: Regex to match each line in a file, with windows and/or linux line break included, even for missing line break at EOF My requirement is to match each line of a text file, including the line terminator of each, at most excluding the terminator of the last line, to take into account the ... | {
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"tags": "performance, regex, posix",
"url": null
} |
np-complete, decision-problem, polynomial-time
Title: Is it Polynomial to decide whether any product of input numbers satisfies a boolean expression? I have an input number c of n bits and its prime factorization. I want to find a divisor of c with certain fixed bits "f". For example:
INPUT:
c=1100011 (99) (n=7)
prime... | {
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"tags": "np-complete, decision-problem, polynomial-time",
"url": null
} |
condensed-matter, symmetry, crystals
Title: Most symmetric unit cell in a two-dimensional arrangement Consider the two dimensional structure below, where two atoms A (white) and B (black) are displayed like a brick wall.
I need to find the most symmetric primitive unit cell of this structure and the unit vectors of t... | {
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"tags": "condensed-matter, symmetry, crystals",
"url": null
} |
c++, quiz, sfml
while(getline(database, words))
{
if(words.find("-") == 0) //Grabs all lines from data.ini starting with "-" and puts them into vector
{
storage.push_back(words);
}
}
double numbOfQuestions = (storage.size()/4)-1; //Number of q... | {
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"tags": "c++, quiz, sfml",
"url": null
} |
quantum-computing, quantum-information, universal-computation
I understand that there are universal sets of two-qubit quantum gates but does it imply that the set must always consist of two-bit gates? No, it is not necessary for a set of gates universal for quantum computation to contain a two-qubit gate. | {
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"tags": "quantum-computing, quantum-information, universal-computation",
"url": null
} |
java, beginner, web-scraping, stackexchange
while(scanner.hasNextLine()) {
oneLine = scanner.nextLine();
if(oneLine.matches(".*<div class=\"post-text\" itemprop=\"description\">.*")) {
while(scanner.hasNextLine()&&(!oneLine.matches(".*<div class=\"post-menu\">.*"))) {
... | {
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"openwebmath_score": null,
"tags": "java, beginner, web-scraping, stackexchange",
"url": null
} |
acoustics, humidity, attenuation
The worst-case scenario, where we get the most attenuation per wavelength, is $f \tau_N \sim 1$. In this case, the inner energy lags behind the translational energy in such a way that it tends to oppose it. For example, in a sound wave peak, the translational energy can be at maximum a... | {
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"tags": "acoustics, humidity, attenuation",
"url": null
} |
formal-languages, regular-languages, context-free, closure-properties
But here is a strange language that I think implies the opposite:
$L = \{ 0^{i}1^{j}2^{n} \mid i \le n \ \text{ or }\ j \le n \} $
$A(L) = \{ 0^{i}1^{j}2^{n} \mid n = \min(i,j) \} $
$L$ is context free but $A(L)$ isn't. Obviously, at least one of th... | {
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"tags": "formal-languages, regular-languages, context-free, closure-properties",
"url": null
} |
php, rest, curl, phpunit
/**
* @dataProvider notStringAndEmptyProvider
* @expectedException \InvalidArgumentException
* @covers RestClient::setRemoteHost
*/
public function testSetRemoteHostThrowsExceptions($host) {
$this->client->setRemoteHost($host);
}
/**
* @dataProvide... | {
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"tags": "php, rest, curl, phpunit",
"url": null
} |
audio, python, spectrogram
This is what I guessed would be like, as vocal frequencies are typically around the range of 100 to a thousand, right?
A spectrogram is when I divide my samples into a certain amount of windows, and then take the Fourier transform of each of the windows, resulting in a time frequency graph.
... | {
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"tags": "audio, python, spectrogram",
"url": null
} |
c#, asp.net, reflection
if (affectedRows != 1)
{
tran.Rollback();
tran.Dispose();//Dispose
conn.Close();
conn.Dispose();
return -1;//Fail
... | {
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"tags": "c#, asp.net, reflection",
"url": null
} |
dna-sequencing
and:
A: TTTGGG
B: TTGGGG
C: TGGGGG
(In reality these primers are longer and more complex!)
After you have done such a indexing PCR and also cleaned your PCR (get rid of the polymerase, something like this) you have to pool your samples (put them all together) before you are sequencing. And thats the p... | {
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"tags": "dna-sequencing",
"url": null
} |
quantum-mechanics, homework-and-exercises, harmonic-oscillator
To find $\left<x^2\right>$, I thought I'd be smart and find it using the definition of $\xi$ like this: Since $x=\sqrt{\frac{\hbar}{m\omega}}\xi$, then $\left<x^2\right> = \left<\left(\sqrt{\frac{\hbar}{m\omega}}\xi\right)^2\right> = \frac{\hbar}{m\omega}\... | {
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"id": 57467,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "quantum-mechanics, homework-and-exercises, harmonic-oscillator",
"url": null
} |
quantum-mechanics, atomic-physics, spectroscopy, orbitals
What does he mean here?
Perhaps I am missing the significance of the three series. Perhaps there is some other physics going on?
What is the significance of the three series? Why are they always shown in textbooks? 1 He is saying that, just as in the three se... | {
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"tags": "quantum-mechanics, atomic-physics, spectroscopy, orbitals",
"url": null
} |
javascript
function ViewModel() {
var self = this;
self.cars = constants.cars;
// ...
} | {
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"openwebmath_score": null,
"tags": "javascript",
"url": null
} |
java, spring, junit
@Test
public void listFolder_shouldReturnFolderItems() throws Exception {
File tempUploadFile1 = temporaryFolder.newFile("testFile2.txt");
FileUtils.writeStringToFile(tempUploadFile1, "test file content", "UTF-8");
String testFilePath1 = String.format("%s/%s", TEST_FOLDE... | {
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "java, spring, junit",
"url": null
} |
newtonian-mechanics, friction, aerodynamics, speed
Title: Is possible to use the air friction to increase the speed of a car? Its possible to make a device that, attached to the car, it will use the air that hits the car at high speed and give the car a boost? Friction wants to resist relative movement between the ai... | {
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"tags": "newtonian-mechanics, friction, aerodynamics, speed",
"url": null
} |
sql, sql-server, t-sql
--Attempt 4 (WORKS!!!)
IF EXISTS (SELECT * FROM sys.assemblies WHERE name = 'SQL_CLR_Functions')
BEGIN
EXEC (N'CREATE FUNCTION dbo.CLR_CharList_Split(@list nvarchar(MAX), @delim nchar(1) = N'','')
RETURNS TABLE (str nvarchar(4000)) AS EXTERNAL NAME SQL_CLR_Functions.[Library.SQL.... | {
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"tags": "sql, sql-server, t-sql",
"url": null
} |
performance, html, regex, go, markdown
scanner := bufio.NewScanner(input)
for scanner.Scan() {
line := scanner.Text()
...
}
}
Use []byte instead of string
In go, a string is a read-only slice of bytes. Working with strings is usually more expensive than working with slice of bytes,
so use []... | {
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Proof: We will follow mathlove's beautiful answer. Before the proof begins, note that $N$ must contain a canonical copy of $\mathbb{N}$, namely the subsemiring generated by $1$. For convenience, we will assume that $\mathbb{N}\subset N$, which lets us use constants like $5$ without explaining that $5$ means $1+1+1+1+1$... | {
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"lm_q1_score": 0.9770226334351969,
"lm_q1q2_score": 0.8417423353935076,
"lm_q2_score": 0.8615382147637196,
"openwebmath_perplexity": 327.63171772041284,
"openwebmath_score": 0.9709072113037109,
"ta... |
javascript, beginner, dom
Title: Refactor JavaScript nested if-else I'm really new to code optimization and JS. I would like to ask for help on optimizing my code. Thank you in advance.
Here is my code:
if(entity_param_connections_products == "PL") {
if(pl_flex_l1_label === ""){
document.getElementById("... | {
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"tags": "javascript, beginner, dom",
"url": null
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homework-and-exercises, pressure, atmospheric-science, ideal-gas, fluid-statics
If you assume that the temperature of the atmosphere is uniform then the pressure varies as height like $P(z) = P_0 \, exp(-\frac{M g z}{R T})$, with $M$ the molar mass of air, $g$ the acceleration due to gravity (assumed constant), $R$ th... | {
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"tags": "homework-and-exercises, pressure, atmospheric-science, ideal-gas, fluid-statics",
... |
Proof 4 barely counts because it’s really just Proof 3 with more noise. Once you whittle down to the one case you need to eliminate, you end up with a modular arithmetic argument not substantively different from what you need if you just prove it directly. Yet it was the approach chosen by many of the weaker student... | {
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"lm_q1_score": 0.9867771809697151,
"lm_q1q2_score": 0.8113174788893635,
"lm_q2_score": 0.8221891370573388,
"openwebmath_perplexity": 1123.5114730926791,
"openwebmath_score": 0.8474717140197754,
"tags"... |
graphs, algorithm-analysis, runtime-analysis, graph-traversal, heaps
Title: Time complexity of BFS with min heap Given a matrix of size m x n, I am trying to traverse it using BFS from top left corner to bottom right corner. Instead of using a normal queue for BFS, I am using a min heap. For each cell, I am inserting ... | {
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"openwebmath_score": null,
"tags": "graphs, algorithm-analysis, runtime-analysis, graph-traversal, heaps",
"url": null
} |
python, json
Now, how can we represent a location in a template in such a way that we can use it as a key in a dictionary? Well, a location is a template is always a key in a dictionary, so we'd like to represent it as the pair (dictionary, key). However, this won't work, because only immutable (constant) objects can ... | {
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"tags": "python, json",
"url": null
} |
c++, beginner, reinventing-the-wheel, complex-numbers
Title: C++ Calculator for complex numbers I've written a little calculator in C++ for complex numbers:
#include <iostream>
using namespace std;
class ComplexNumber {
public:
double real;
double imaginary;
void add(ComplexNumber a, Com... | {
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jupiter, planetary-science
If instead, we use the volumetric average radius of $R=69900$ km, this reduces to $3.34\times 10^{38}$ kg m$^2$ s$^{-1}$.
This simple approach neglects the more complicated equation of state of Jupiter, it's non-sphericity and the probable presence of a solid core. Consideration of these, to... | {
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"tags": "jupiter, planetary-science",
"url": null
} |
lagrangian-formalism, field-theory, differential-equations, variational-calculus, effective-field-theory
However, the Wilsonian effective action
$$\begin{align}
\exp&\left\{ -\frac{1}{\hbar}W_c[J^H,\phi_L] \right\}\cr
~:=~~~&\int \! {\cal D}\frac{\phi_H}{\sqrt{\hbar}}~\exp\left\{ \frac{1}{\hbar} \left(-S[\phi_L+\phi_H... | {
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"tags": "lagrangian-formalism, field-theory, differential-equations, variational-calculus, ... |
y + 3 ≤ 3
y ≤ 0
So y is 0 or negative
Second scenario - remove the absolute value brackets. Put a negative sign around the other side of the inequality, AND flip the sign:
y + 3 >= -3
y >= -6
Therefore we have a possible range for y: -6=<y<=0
Ok, so far so good, we're half way through. What about x?
Here's the for... | {
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"url"... |
The alternating series test
If the terms of an alternating series, $\sum_{n = 1}^\infty \,(-1)^n a_n$
(1) are decreasing, and (2) if the limit of the size of the terms, as n → ∞ is zero:
then the series converges.
Proof of the alternating series test
First, take a look at the alternating series on a number line. W... | {
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"tags": nu... |
Hint: Divide top and bottom by $b^n$.
At the top we get $b+a\left(\dfrac{a}{b}\right)^n$.
Remarks: $1$.) Presumably it has already been shown that if $|x|\lt 1$ then $\lim_{n\to\infty} x^n=0$. If not, let $|x|=1+t$. By the Binomial Theorem, or the Bernoulli Inequality, $(1+t)^n \ge 1+nt$. From this one can prove quic... | {
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"lm_q2_score": 0.8354835289107307,
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"openwebmath_score": 0.8603295683860779,
"ta... |
semiconductor-physics, electronics, information, electrical-engineering, data
This is inconvenient, because we wanted to calculate $\left[\text{entropy flux}\right]$ in terms of how fast information could be passed through something like a wire or pipe, i.e. in terms of $\frac{\left[\text{information}\right]}{\left[\t... | {
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"tags": "semiconductor-physics, electronics, information, electrical-engineering, data",
... |
(You can draw it on the graph …Explains the slope concept, demonstrates how to use the slope formula, points out the connection between slopes of straight lines and the graphs of those lines. You, and I are going to create a slope graph chart together, in a simple step-by-step format. This tutorial shows you how to tak... | {
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"id": null,
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"lm_q2_score": 0.819893340314393,
"openwebmath_perplexity": 326.4255176426403,
"openwebmath_score": 0.64701247215271,
"tag... |
ros2
undefined reference to rosidl_message_type_support_t const* rosidl_typesupport_cpp::get_message_type_support_handle<geometry_msgs::msg::Twist_<std::allocator<void> > >()' | {
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"tags": "ros2",
"url": null
} |
c++, c++11, stl, iterator
You are allowed to call the destructor.
~Range(); // delete resources
But this stops the object from being an object. The only thing you are allowed to do at this point is call the call placement new to make it a real object again (or pass it around as void*). So calling the destruct... | {
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"tags": "c++, c++11, stl, iterator",
"url": null
} |
waves, doppler-effect
Title: Does "apparent frequency" mean the Doppler effect is not an actual physical effect? When discussing the Doppler effect, we use the word "apparent frequency". Does that mean that the frequency of sound is still that of the source and that it is some physiological phenomenon in the listener'... | {
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"tags": "waves, doppler-effect",
"url": null
} |
imu, navigation, ekf, robot-localization, ekf-localization-node
Also, my TF tree is super simple right now: map => (equal) odom => (set by robot_localisation) base_link => (equal) imu
Originally posted by mathislm on ROS Answers with karma: 13 on 2023-01-06
Post score: 1
Cheers for adding your config and sensor data... | {
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"tags": "imu, navigation, ekf, robot-localization, ekf-localization-node",
"url": null
} |
ros, gazebo, arm-controller, ros-kinetic
[ INFO] [1591783185.571660594]: Finished loading Gazebo ROS API Plugin.
[ INFO] [1591783185.574029289]: waitForService: Service [/gazebo/set_physics_properties] has not been advertised,
waiting...
[ INFO] [1591783185.642075820]: Finished loading Gazebo ROS API Plugin.
[ INF... | {
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"url": null
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Therefore, we can provide an upper bound for $\sum a_{n}$:
$\sum a_{n}<\sum8\cdot9^{n-1}\cdot\frac{1}{10^{n-1}}=\sum8\cdot\left(\frac{9}{10}\right)^{n-1}.$ The right hand side is a convergent geometric series with sum $8\sum_{n=1}^{\infty}\left(\frac{9}{10}\right)^{n-1}=80.$ Thus, $\sum a_n$ is convergent by comparison... | {
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"openwebmath_score": 0.7517779469490051,
"tags": nu... |
c++, parsing, json
static bool check_bytes(std::istream& istrm, const char* expected) {
const size_t length(strlen(expected));
for (size_t i = 0; i < length; i++) {
char ch;
if(!istrm.get(ch)) {
return false;
}
if (ch != expected[i]) {
return false;
... | {
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"tags": "c++, parsing, json",
"url": null
} |
quantum-mechanics, operators, heisenberg-uncertainty-principle, commutator, observables
Title: Generalizing the Uncertainty Principle for acceleration, jerk, etc The Uncertainty Principle states that the more you know about a particles position, the less you know about its velocity and vice-versa, and there is an equa... | {
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"tags": "quantum-mechanics, operators, heisenberg-uncertainty-principle, commutator, observ... |
statistical-mechanics, integration
$$\frac{\partial}{\partial \beta} e^{- \beta mv^2 / 2} = - \frac{mv^2}{2} e^{-\beta mv^2/2}.$$
Thus, substituting this fact into $\beta m \int_0^\infty v^2 e^{-\beta mv^2/2} dv$ gives the right hand side of the equation you wrote in the original post. | {
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quantum-field-theory, condensed-matter, hamiltonian, superconductivity, bose-einstein-condensate
Title: A problem with the BCS energy expectation value of an excited state I want to calculate the energy expectation value of the following state.
\begin{align}
|\Psi_{ex}\rangle = \hat{c}_{-k'\downarrow}^\dagger... | {
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But that doesn't matter, you can take v2 to be vector from P to any point P2 on L. They all lie in the same plane, so it does not matter which vector you choose.
5. Originally Posted by messianic
3.) Determine whether the line L and the plane P intersect or are parallel. If they interest, find the point of intersectio... | {
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"openwebmath_score": 0.6025896668434143,
... |
performance, vba, excel
Title: Optimizing large Excel report I have a problem with generation of my report. Data is read from other sheet in report. Most time is wasted on execution of LineColor() and LineGroup(). Those operations are based on hierarchy, which is copied and pasted into cells parallel to every row. | {
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\; = \; -\tfrac12\tan\alpha \int_0^\alpha \ln\left(\tan\big(\tfrac{\alpha+\phi}{2}\big) \tan\big(\tfrac{\alpha-\phi}{2}\big)\right)\,d\phi \\ & = -\tfrac12\tan\alpha \int_0^\alpha \left\{ \ln\left(\tan\big(\tfrac{\alpha+\phi}{2}\big)\right) + \ln\left(\tan\big(\tfrac{\alpha-\phi}{2}\big)\right)\right\}\,d\phi \\ & = -\... | {
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"tags": ... |
-
Circle areas is twice the area under this curve. – user2468 Aug 28 '12 at 16:40
The one you came across with doesn't seem to make much sense without at least limits in the integral (to see what are we integrating) – DonAntonio Aug 28 '12 at 16:40
The same thing works for the volume of a sphere as integral of the su... | {
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python, python-2.x, tree, graph
[0, None, 0]
[1, 0, 1]
[2, 0, 1]
[3, 0, 1]
[4, 1, 2]
[5, 1, 2]
[6, 1, 2]
[7, 4, 3]
[8, 5, 3]
[9, 6, 3]
[10, 6, 3]
[11, 2, 2]
[12, 11, 3]
[13, 11, 3]
[14, 11, 3]
[15, 3, 2]
[16, 15, 3]
This function does the task, but I'm eager for feedback on the quality of this implementation. Any fe... | {
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"tags": "python, python-2.x, tree, graph",
"url": null
} |
clouds
Title: What is this ring of cloud? We were in Legoland in Windsor (SE England) recently, and towards the end of the day, we noticed what looked like a ring of cloud in the sky. It was quite large (hard to say as being up in the sky we didn't have a reference point to measure it by). It gently changed shape as i... | {
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"tags": "clouds",
"url": null
} |
Simply multiplying by $n$ yields the desired moments:
$$I_C=M\left(\frac{L^2}{4\tan^2(\frac\pi n)} + \frac{L^2}{12}\right)$$
• Thank you too! I think there is an error: mass density is not M/L, but M/(nL); in this way the result collides with that of Andrei and in turn all the above particular cases (verifiably in li... | {
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"tag... |
slam, navigation, odometry, cartographer, scan
Originally posted by SCrusher on ROS Answers with karma: 41 on 2017-01-16
Post score: 3
Hey,
you need a IMU topic that publich /imu msg. I d'ont know, if you can use it only with /scan and /odom topic
you have to change the configuration in your backpack_2d.lua.
use_lase... | {
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"tags": "slam, navigation, odometry, cartographer, scan",
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} |
homework-and-exercises, electric-fields, thermal-radiation
Second, we have to consider all of Maxwell's equations. Once we do, we find that only 2 of the 6 components of $\vec{E}$ and $\vec{B}$ are genuinely independent (in the sense that their value and time derivative can be specified as initial conditions), the res... | {
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"tags": "homework-and-exercises, electric-fields, thermal-radiation",
"url": null
} |
formal-languages, pumping-lemma
If the pumping lemma doesn't work, what does work? There is a generalization of the pumping lemma in which you mark $p$ locations of the word $w$, and then the adversarial partition $w = xyz$ must satisfy (i) $xy$ contains at most $p$ marked locations, (ii) $y$ must contain at least one... | {
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"tags": "formal-languages, pumping-lemma",
"url": null
} |
data-mining, text-mining, feature-selection, feature-extraction
What could be the other ways in which I could differentiate among the question categories? Or as my question was in its first place, "What kind of features do I select for efficient categorization?" If I understand you correctly, you're looking to take th... | {
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"tags": "data-mining, text-mining, feature-selection, feature-extraction",
"url": null
... |
java, algorithm, strings
int n = text.length();
int m = pattern.length();
if (m > n) {
return -1;
}
int[] prefixFunction = computePrefixFunction(pattern);
int q = 0;
for (int i = Math.max(0, startIndex); i < n; ++i) {
... | {
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"tags": "java, algorithm, strings",
"url": null
} |
solar-system, asteroids
Title: Are there any natural satellites in retrograde Sun orbit? As I watch the video of the asteroids being discovered, all I see is prograde orbits. Their prevalence is fully understandable and justified, but the Sun gets interstellar visitors occasionally and I see no specific reason why it ... | {
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"tags": "solar-system, asteroids",
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} |
python, object-oriented, unit-testing
Title: Testing Terminal Text Game with Classes and Game Loop I am making a super simple and dumb terminal text game to try out unittest in python. I have ran into a problem. When I run the test, the game loop is ran, and I have to manually insert input to continue to the tests.
I... | {
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"tags": "python, object-oriented, unit-testing",
"url": null
} |
python, beginner, python-3.x, battle-simulation, pokemon
# Add the displays for the opponent
for i in range(len(attrs)):
self.displays[1][i].set(attrs[i])
self.displays[1][-1].set('N/A')
def power(self):
# Set the text to the power. Doesn't need
# the value to be assign... | {
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"tags": "python, beginner, python-3.x, battle-simulation, pokemon",
"url": null
} |
algorithm, c, graph, pathfinding, dijkstra
/* Once here, there is no path from the source vertex
to the target vertex:
*/
CLEAN_SEARCH_STATE_2;
TRY_REPORT_RETURN_STATUS(RETURN_STATUS_NO_PATH);
return NULL;
}
Critique request
Please, tell me anything that comes to mind. Also, I ran my program again... | {
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java, algorithm, strings, pattern-matching
}
The new version of the code can be run here A couple of comments on your answer:
Code style
If you've already stored the pattern.length(), why keep calling the method? Just be consistent and use that variable. Same goes for str.length(). I'd just store it and use it.
I wo... | {
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newtonian-mechanics, newtonian-gravity, energy-conservation, work, potential-energy
Let a body P (Planet or Particle or whatever) moving in orbit around a center of attraction called $\:\rm{SUN}$, as in above Figure. Suppose that the attractive force $\:\mathbf{f}\left(r\right)\:$ depends continuously only on the dist... | {
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2) $d_{p+1},\dots,d_{p+m}$ are greater than 1. Then they are all equal to 2, since the degree of the whole monomial equals $m$. In this case there are $p(p+1)\dots (p+m-1)$ admissible trees (well, they are all admissible for such a choice of degrees and we may either apply the above formula for all trees, or prove it b... | {
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"lm_q2_score": 0.8723473813156294,
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"openwebmath_score": 0.8851345181465149,
"tag... |
We claim that at each step, the inequality $$p_{S_m\cap[m]}(n)\leq k \qquad(*)$$ holds. If $$(*)$$ is proved, we will get $$k\leq p_{S_n}(n)\leq k$$, as required.
We prove $$(*)$$ by induction on $$m$$. Clearly, it holds for $$m=0$$. Assume now that $$p_{S_{m-1}\cap[m-1]}(n)\leq k$$. If $$S_m=S_{m-1}\setminus\{m\}$$, ... | {
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"lm_q1q2_score": 0.8098588074745108,
"lm_q2_score": 0.8244619263765707,
"openwebmath_perplexity": 416.14055797869946,
"openwebmath_score": 0.9861634969711304,
"tags... |
physical-chemistry
To describe the microscopic properties of matter, quantum mechanics uses wave functions, whose structure and time dependence is governed by the Schrödinger equation. In atoms the charge distributions described by the wave function are rarely observed. The hydrogen atom is unique, since it only has o... | {
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"tags": "physical-chemistry",
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} |
metal, hydrolysis
Zinc is slightly below this bolded line in the series, but I'm afraid I do not fully understand what that means. "Hydrogen gas bubbled through an alkaline solution, shedding two electrons to produce water and neutralize the solution"? The overall potential of an electrochemical cell is equal to the ... | {
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"tags": "metal, hydrolysis",
"url": null
} |
plasma-physics
Second, there is no guarantee that after von Neumann software whitening, the output will be random. It is theoretically possible to end up with the stream "101010101010..." after whitening, even if the input was actually random (this is unlikely in this situation, of course). Of course, if the input is ... | {
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c++, c++17, classes, opengl
You should separate the OpenGL specific code and the mesh data. Ideally the Mesh class should have no dependencies on OpenGL.
Have a "Renderable Object" class contain a mesh and describe additional information (e.g. position in the world (transform), texture, shaders and other "per-object" ... | {
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"tags": "c++, c++17, classes, opengl",
"url": null
} |
general-relativity, differential-geometry, conformal-field-theory
Which I answered as follows.
Are you speaking globally? Because here I'm speaking about the pushforward of the transformation: so that (in 2D), yes, the algebra of vector fields that exponentiate to e.g. level curves of $Re$ and $Im$ of meromorphic f... | {
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... |
ros, desktop-full, ubuntu, dependencies
Originally posted by Incendie on ROS Answers with karma: 1 on 2015-03-10
Post score: 0
Is this 14.04.2 by any chance?
See if the answer by @demmeln in Ubuntu 14.04.2 unmet dependencies helps you.
Originally posted by gvdhoorn with karma: 86574 on 2015-03-10
This answer was ACC... | {
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javascript, react.js
ReactDOM.render(
// The Fragments below can be replaced with <> </> with an up-to-date Babel
// (Stack Snippets do not support it)
<React.Fragment>
<RadioImage radioGroup="radioGroup" value="value1" text="text1" />
<RadioImage radioGroup="radioGroup" value="value2" ico... | {
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"url": null
} |
Intuitively (or precisely), which functions can be approximated by straight lines?
I am trying to build up some intuition of what the various notions of analysis mean. By intuition of continuity is that it means the graph of the function is 'connected', but not necessarily in any nice way. This lead me to ask the ques... | {
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"lm_q2_score": 0.8872045966995027,
"openwebmath_perplexity": 168.20632088211147,
"openwebmath_score": 0.935771107673645,
"tag... |
Jyden reviewing about Formula For Interior Angles Of A Polygon at Home Designs with 5 /5 of an aggregate rating.. Don’t forget shares to your Social Media Or Bookmark formula for interior angles of a polygon using Ctrl + D (PC) or Command + D (macos). If you learn the formula, with the help of formula we can find sum o... | {
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"lm_q1_score": 0.9473810525948927,
"lm_q1q2_score": 0.8504595139873645,
"lm_q2_score": 0.897695295528596,
"openwebmath_perplexity": 712.8906858183632,
"openwebmath_score": 0.6414366960525513,
"t... |
php, object-oriented, design-patterns
# @str Password
public $password;
# @str user IP
public $userIp;
/*===============================
= Methods =
================================*/
/**
*
* Construct - Set customer, username and password
* @param $_custo... | {
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"url": null
} |
Small examples, where the number at array index $i$ tells you how many $k$-digit numbers have digit sum $i$:
k = 0: [1]
k = 1: [1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
k = 2: [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1]
k = 3: [1, 3, 6, 10, 15, 21, 28, 36, 45, 55, 63, 69, 73, 75, 75, 73, 69, 63, 55, 45, 36, 28, 21... | {
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"lm_q1_score": 0.9748211612253742,
"lm_q1q2_score": 0.810215835134914,
"lm_q2_score": 0.8311430520409023,
"openwebmath_perplexity": 474.88231810878784,
"openwebmath_score": 0.6242581605911255,
"tag... |
java, android, json
switch (status) {
case 200:
case 201:
BufferedReader br = new BufferedReader(new InputStreamReader(connection.getInputStream()));
StringBuilder sb = new StringBuilder();
String line;
while ((line = br.readLine()) != null) {
... | {
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"url": null
} |
mod.2 <- lm(y - b0.est ~ 0 + x)
summary(mod.2)
# Estimate Std. Error t value Pr(>|t|)
# x 0.9098 0.3088 2.946 0.00401 ** | {
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"openwebmath_score": 0.733258843421936,
"tags":... |
experimental-physics
Bonus: Interpolation
This is probably not likely the one that you would expect to use often when doing an experiment. Still, it has its uses. To use it you should get everytime the same results for X. The calculation is also trivial and has many variation (linear interpolation, log interpolation e... | {
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"tags": "experimental-physics",
"url": null
} |
# How do I find tangent on the unit circle?
I know that $\sin=y$ and that $\cos=x$ so how do I find tangent? I've seen some diagrams where the tangent line touches the unit circle at $(1,0)$, I'm wondering how this is derived?
EDIT: Explanations using similar triangles are most intuitive to me, if things could be exp... | {
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"lm_q1q2_score": 0.8348254503203195,
"lm_q2_score": 0.863391602943619,
"openwebmath_perplexity": 297.41243343390744,
"openwebmath_score": 0.8118413686752319,
"tag... |
the-moon, size
Title: Why is the Moon's volume so small compared to the Earth's? The Moon has 27.3% of the Earth's radius/diameter but only 2% of the Earth's volume. I don't quite get it why the Moon's volume is that small despite having more than a quarter the 2-dimensional size of Earth. Compared to the Earth, does ... | {
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"id": 7028,
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"openwebmath_score": null,
"tags": "the-moon, size",
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} |
calibration, asus-xtion-pro-live, camera-pose-calibration, webcam, camera-calibration
Originally posted by davinci with karma: 2573 on 2013-01-05
This answer was ACCEPTED on the original site
Post score: 1
Original comments
Comment by dinamex on 2013-01-06:
I used your repository and it worked without a problem. Did ... | {
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"tags": "calibration, asus-xtion-pro-live, camera-pose-calibration, webcam, camera-calibra... |
I think the OP's problem here might be with the way the "$\dots$" notation is used in mathematics, to indicate a sequence (in this case the sequence of factors to be multiplied) by listing the first few terms and (if the sequence is finite) the last few terms, leaving it to the reader to mentally fill in the rest (on t... | {
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"lm_q1q2_score": 0.8072813214677392,
"lm_q2_score": 0.8376199633332891,
"openwebmath_perplexity": 195.48231559648949,
"openwebmath_score": 0.9993470311164856,
"ta... |
navigation, move-base
Original comments
Comment by Eric Perko on 2011-12-29:
You shouldn't need Gazebo to verify that your navigation configs are working - Stage will work just fine for that purpose and is a lot easier to setup than Gazebo (unless you already have models and such done). Stage won't be a completely acc... | {
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"tags": "navigation, move-base",
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the-moon, planetary-formation, planetary-ring, orbital-mechanics, accretion-discs
Title: What stabilizes rings or accretion disks? We think, more or less, that our Moon was formed from an accretion disk caused by a Mars-sized impactor. Cool.
Tidal forces can break apart a moon, causing rings.
Ashes to ashes, dust to... | {
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"tags": "the-moon, planetary-formation, planetary-ring, orbital-mechanics, accretion-discs... |
black-holes, event-horizon, causality
Title: What prevents two particles that made a black hole to unmake it? Assume you have two high energy particles approaching each other and forming a black hole even before colliding (but before a singularity is formed, which I am not sure that is possible). If the laws of physic... | {
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"tags": "black-holes, event-horizon, causality",
"url": null
} |
ros-melodic
catkin_package(
CATKIN_DEPENDS
message_runtime
roscpp
pcl_ros
autoware_msgs
tf
)
include_directories(
${autoware_msgs_INCLUDE_DIRS}
${catkin_INCLUDE_DIRS}
include)
#imm_ukf_pda
add_executable(imm_ukf_pda
nodes/imm_ukf_pda/imm_ukf_pda_main.cpp
nodes/imm_ukf_pda/imm_ukf_... | {
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"openwebmath_score": null,
"tags": "ros-melodic",
"url": null
} |
algorithms, graphs, graph-traversal, dag
I have no preferences in how the graph is visited, and it's fine to visit the same vertex multiple times during different traversals.
(Real application: I am generating test cases for human testers and want them to help them perform their tests at every 'vertex' with as few run... | {
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"id": 13777,
"lm_label": null,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "algorithms, graphs, graph-traversal, dag",
"url": null
} |
gravity, newtonian-gravity, kinematics, projectile, coordinate-systems
Title: When does acceleration due to gravity equal positive/negative? For example a projectile is launched at an angle. What would $a$ in $y=vt +.5at^2$ be?
Let's say I choose up to be positive. How do you not confuse yourself whether to use positi... | {
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"tags": "gravity, newtonian-gravity, kinematics, projectile, coordinate-systems",
"url": ... |
c, homework, linux, shell, namespaces
Why try to synchronize the type? Instead reference the type. Pedantic, avoid UB of signed overflow, use unsigned math with 1u.
// Is this the right type?
// cmd->params = calloc(MAX_PARAMS + 1, sizeof(char*));
// ... | {
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"tags": "c, homework, linux, shell, namespaces",
"url": null
} |
javascript, html, tic-tac-toe
Edit: just realized that I forgot to change the Symbols that the program checks for in the win function to "O" instead of "X" for the if condition that checks whether "O" won. Ignore that please. The biggest issue here is the repetition. Whenever there is repeated code that only varies b... | {
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "javascript, html, tic-tac-toe",
"url": null
} |
electromagnetism, field-theory, polarization, vector-fields
Could someone explain intuitively what does this mean? In particular, why would can $\epsilon_u$ be regarded as polarisation vectors and what is meant by (linear) polarisation? Let's start with what polarization means.
When talking about polarization we alway... | {
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"openwebmath_score": null,
"tags": "electromagnetism, field-theory, polarization, vector-fields",
"url": null
} |
mechanical-engineering, machining, drilling, brass
Some 10mm reamers:
http://www.aliexpress.com/item/Free-shipping-cnc-nc-2015-Reamer-10-0-X30X75L-High-speed-reamer-high-degree-of-finish/32244988192.html
http://www.aliexpress.com/item/Square-End-10mm-Cutting-Diameter-6-Flutes-HSS-Hand-Reamer-Milling-Cutter/32240625696... | {
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "mechanical-engineering, machining, drilling, brass",
"url": null
} |
urdf
Edit 2:
Error when run launch file directly from launch folder
Screenshot launch file.png
Originally posted by Thang Nguyen on ROS Answers with karma: 93 on 2016-09-12
Post score: 1
Original comments
Comment by bhavyadoshi26 on 2016-09-12:
Did you build the package after creating it?
Also have you checked the $... | {
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} |
naive-bayes-classifier
You allude to that already, but the problem you suggest isn't a problem. Internally you don't calculate a probability and then take the log again. It stays in log space. So for very small P, log P is a large negative number while P itself may underflow to 0.0. But you may never need to evaluate ... | {
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"lm_q2_score": null,
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"openwebmath_score": null,
"tags": "naive-bayes-classifier",
"url": null
} |
calibration, ros-kinetic, rgbd
Title: rgbd_calibration YAML Parsing Exception: Bad Conversion Error
This work is a recurrence of Basso's work: https://github.com/iaslab-unipd/rgbd_calibration, but I have encountered the following problems:
[ INFO] [1558852802.759705575]: camera calibration URL: file:///home/lhy/.ros/... | {
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python, python-3.x, reflection
def print_co_obj_fields(fields):
for name, co_field in fields:
print(f"{name:<20} = {co_field}")
The main part then changes to:
if __name__ == "__main__":
def my_add(a, b):
first = a
second = b
return first + second
fields = co_obj_fields(m... | {
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"openwebmath_score": null,
"tags": "python, python-3.x, reflection",
"url": null
} |
to the range of data. Complexity Counting sort takes time and space, where n is the number of items we're sorting and k is the number of possible values. length and thus has a running time of $\Theta(n)$. In this course we will perform the following types of analysis: the worst-case runtime complexity of the algorithm ... | {
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"id": null,
"lm_label": "1. YES\n2. YES\n\n",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9674102524151827,
"lm_q1q2_score": 0.8298136572034452,
"lm_q2_score": 0.8577681031721325,
"openwebmath_perplexity": 925.4757654217474,
"openwebmath_score": 0.3923802375793... |
# Tag Info | {
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"id": null,
"lm_label": "1. Yes\n2. Yes",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.967899289579129,
"lm_q1q2_score": 0.8001737623001021,
"lm_q2_score": 0.8267117983401363,
"openwebmath_perplexity": 498.43849297901414,
"openwebmath_score": 0.8938207626342773,
"tag... |
genetics, dna, rna, allele
Title: A basic example of the interactions of 2 or more non-identical alleles leading to an advantageous outcome for an individual organism Could someone help me out with a basic example of the interactions of 2 or more non-identical alleles leading to an advantageous outcome for an individu... | {
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "genetics, dna, rna, allele",
"url": null
} |
organic-chemistry, aromatic-compounds
Title: Abstraction of a proton in cycloheptatriene So, whenever there is abstraction of H+ by an acid-base reaction, I see that the proton on the sp3-hybridized carbon is taken. Why is this if you take into account that vinylic hydrogens are more acidic?
Also, on a sidenote, what ... | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "organic-chemistry, aromatic-compounds",
"url": null
} |
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