text stringlengths 1 1.11k | source dict |
|---|---|
-
I was going to say that! You are fast! – dot dot Oct 29 '12 at 22:44 wow this is dam clever – Justin Meltzer Oct 29 '12 at 22:47
Factor out the 2/3. Then write $$\sum_{n=1}^{\infty} \frac{n}{3^n} = \sum_{n=1}^{\infty} \frac{1}{3^n} + \sum_{n=2}^{\infty} \frac{1}{3^n} + \sum_{n=3}^{\infty} \frac{1}{3^n} + \cdots$$
... | {
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"openwebmath_score": 0.9904879331588745,
"tag... |
books, research
read
experiment with existing systems
and read a lot more. | {
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"tags": "books, research",
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} |
c#, error-handling, selenium
Implementing the mentioned points will look like so
public bool? GetResult(TimeSpan timeout)
{
var deadline = DateTime.Now.Add(timeout);
var waitTimeout = TimeSpan.FromSeconds(5);
do
{
WebElement summaryWebElement = Driver.FindElement(By.Id("summary"));
i... | {
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"tags": "c#, error-handling, selenium",
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} |
php, error-handling
if (empty($name) || empty($id) || empty($field_name)) {
continue;
}
$arr['field'][$name][$id][$field_name] = $field->nodeValue;
}
This looks less complicated, at least to me, but it does exactly the same work.
You could also introduce a method to get the nodeValue or NULL, given $attribut... | {
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to interpret log transformed independent variable in logistic regression 17 Feb 2017, 14:28. © 2007 - 2019, scikit-learn developers (BSD License). In logistic regression, the dependent variable is a logit, which is the natural log of the odds, that is, So a logit is a log of odds and odds are a function of P, the proba... | {
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of $$X$$ and $$C\times C^\ast\subset B^\ast$$. Since $$B\cap B^\ast=\emptyset$$, $$(B_\lambda\times B_\lambda^\ast)\cap(C\times C^\ast)=\emptyset$$. But then$$\bigl(B_\lambda\times(B_\lambda^\ast\cap C^\ast)\bigr)\cap\bigl(C\times(B_\lambda^\ast\cap C^\ast)\bigr)=\emptyset$$and, since $$B_\lambda^\ast\cap C^\ast\neq\em... | {
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soft-question, electroweak
$W^+$ moves the vev to the upper component, therefore it becomes massive
$W_3$ gives the vev a factor $- g' \frac{1}{2}$, therefore it becomes massive
$B$ gives the vev a factor $g \frac{1}{2}$, therefore it becomes massive | {
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} |
Realize that my doubt, in matrix terms, will be so:
$$\begin{bmatrix} a_{11} & a_{12} \\ a_{21} & a_{22} \\ \end{bmatrix} \begin{bmatrix} x''\\ y''\\ \end{bmatrix} + \begin{bmatrix} b_{11} & b_{12} \\ b_{21} & b_{22} \\ \end{bmatrix} \begin{bmatrix} x'\\ y'\\ \end{bmatrix} + \begin{bmatrix} c_{11} & c_{12} \\ c_{21} & ... | {
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"lm_q2_score": 0.8152324983301568,
"openwebmath_perplexity": 1064.000254333815,
"openwebmath_score": 0.8527883887290955,
"tag... |
of $\mathbf{F}$ directly and we have that: (2). Divergence and curl operators often enter Lagrangians in variational prob-lems related to various physical applications. The corresponding form of the fundamental theorem of calculus is Stokes' theorem, which relates the surface integral of the curl of a vector field to t... | {
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"lm_q1q2_score": 0.8153388883842101,
"lm_q2_score": 0.8198933337131076,
"openwebmath_perplexity": 449.6725952719072,
"openwebmath_score": 0.8059988021850586,
"tag... |
optics, geometric-optics, telescopes, lenses
http://taylortechassoc.com/?page_id=617
The equations he presents are the literal mathematical relationships between incoming and out outgoing ray angles (of any type) and it has a spreadsheet linked to the bottom that walks through both chief and marginal ray examples. I s... | {
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"tags": "optics, geometric-optics, telescopes, lenses",
"url": null
} |
algorithms, dynamic-programming, efficiency
Title: Maximum waiting time between events such that k events are not missed I've been given some homework on dynamic programming and I'm having trouble to find the suboptimal recurrence. Let me copy the statement:
In a given motorcycle training circuit, the number of rider... | {
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"tags": "algorithms, dynamic-programming, efficiency",
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complexity-theory, graphs, space-complexity
Edit
Modified algorithm from stackoverflow (mentioned link) which should solve ustcon problem:
for v_j in neighbours(s)
current, prev = v_j, s
repeat
idx = neighbours(current).index(v_j)
idx = (idx + 1) % len(neighbours(current))... | {
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"tags": "complexity-theory, graphs, space-complexity",
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} |
quantum-field-theory, feynman-diagrams, path-integral
that swap the final state four-momenta.
Finally, all these diagrams are amplitudes. They interfere. At tree-level, the exchanged particle could be a photon, and it could be a $Z^0$, hence both processes contribute, and their interference term is parity violating. (... | {
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"tags": "quantum-field-theory, feynman-diagrams, path-integral",
"url": null
} |
c++, algorithm, c++11, quick-sort
I highBot = low;
I lowTop = high;
--lowTop;
while (highBot < lowTop) {
while ((highBot < high) && (*highBot <= *pivot)) { ++highBot;}
while ((lowTop >= low) && (*pivot < *lowTop)) { --lowTop;}
if (highBot < lowTop) {
std::s... | {
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"tags": "c++, algorithm, c++11, quick-sort",
"url": null
} |
Why does this post require moderator attention?
Why should this post be closed?
+1
−0
Let $B(x) = b_1 x + b_2 x^2 + \cdots$. Then $$\begin{eqnarray*} F_n(b_1, \ldots, b_n) &=& - [x^n] n \log(1 + B(x)) \\ &=& [x^n] n \sum_{i \ge 1} \frac{(-B(x))^i}{i} \\ &=& \sum_{\lambda \, \vdash \, n} \frac{n}{\operatorname{len}(\l... | {
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"tags": ... |
general-relativity, black-holes, earth, estimation
There should, however, be an intermediate-range of masses such that the tidal forces are large enough to make the Earth break off a significant piece and the orbit of the black hole and the two or more pieces of the Earth correspond to a gravitational three(or more)-b... | {
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"tags": "general-relativity, black-holes, earth, estimation",
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} |
forces, vectors, everyday-life
The red arrows show the forces. The blue arrow shows the acceleration of the center of mass. The torque about the right wheel is into your monitor.
The skateboard gains a significant amount of momentum upwards in this way. If we left it alone, it would fly up in the air, flipping, and... | {
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"tags": "forces, vectors, everyday-life",
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quantum-mechanics, energy, wavefunction, path-integral, discrete
$E_n = \left( n + \tfrac12 \right) \hbar \omega~. $
Here, faced with discreteness, you only need appreciate the essential periodicity of the system, the compactness that forces you to a harmonic structure: the waviness of the system; and that most of it ... | {
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"tags": "quantum-mechanics, energy, wavefunction, path-integral, discrete",
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} |
c#, asp.net-mvc-3, asynchronous
2012
The biggest concern I see comes from this line:
AsyncManager.Parameters["result"] = WorkflowInvoker.Invoke(wf, arguments)["MvcOutput"] as IDefineMvcOutput; | {
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c++, c++11, image, graphics
Here is what your interface might look like. I tried to pull out the various methods and data that were really just related to the pixel format, but I might've missed some and the parameters may need to change based off of data inherent to the image class (like data and width for the getPix... | {
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"tags": "c++, c++11, image, graphics",
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c++, optimization
// Set the cooperative behavior
for(int i=1;i<N-1;i++)
block[i] = state[i-1]*state[i]*state[i+1];
Is there a better way to do this? Should I be using some kind of trickery with std::accumulate and the like? Profiling show that this piece of code is in the inner-block of my simulation and takes... | {
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"tags": "c++, optimization",
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acoustics, frequency, dissipation, signal-processing, attenuation
In 3D, the mass density would have units of $[\rho] = \frac{\text{kg}}{\text{m}^3}$ and the above equation calculates the sound intensity $I(\omega)$, i.e. power per area $[I] = \frac{\text{J}}{\text{s} \cdot \text{m}^2}$. | {
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"tags": "acoustics, frequency, dissipation, signal-processing, attenuation",
"url": null
... |
fluid-dynamics, acoustics, flow
Title: Why do you have to blow sideways on a flute? If you were to play a flute, you would want to blow sideways across it, kind of like a bottle, like in Fig 1. Why would this be better than blowing straight in to the hole, like in Fig 2? It seems like more air would go into the flute,... | {
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c#, unit-testing, asp.net-mvc-5
You should use another assert and not an if
Assert.IsNotNull(viewModel);
Resharper even suggests this option:
Test name
Create_DraftFacade_ViewResultWithDraftViewModel
You might also want to reconsider the naming of your tests. Usually we use this pattern
TestedMethod/Property_Test... | {
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greedy-algorithms, packing
time using a greedy approach. Then, you could use your algorithm to solve in polynomial time the decision version of the Bin packing problem, which is known to be NP-complete (and, therefore, unlikely to be solvable in polynomial time). | {
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"tags": "greedy-algorithms, packing",
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homework-and-exercises, electricity, electric-circuits, electrical-resistance
Title: Resistances in a circular loop
I have no idea what formula I'm supposed to use.I just want to know the concept that would allow me to get the answer. I know basic concepts of electricity like charge, currents, etc., but as far resist... | {
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"tags": "homework-and-exercises, electricity, electric-circuits, electrical-resistance",
"... |
Read this from top to bottom to translate the formal wff into English.
And now read the same sequence from bottom to top to translate in the other direction!!
Taking things in stages like this helps a great deal when first learning to translate in either direction. There are lots more worked examples of this kind inv... | {
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"lm_q1q2_score": 0.8335019907196668,
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"openwebmath_score": 0.5224370360374451,
"ta... |
c++, object-oriented, programming-challenge, c++20
int BingoCard::GetRemainder(void) const noexcept
{
int sum{ 0 };
for (int i = 0; i < BingoCardSize * BingoCardSize; ++i)
{
if (!hit[i]) sum += number[i];
}
return sum;
}
and here the main program:
#include "BingoCard.h"
void AoC2021_04(std::istream& in... | {
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"tags": "c++, object-oriented, programming-challenge, c++20",
"url": null
} |
ros, gazebo, manipulator, ur5
Title: UR5 - Gazebo Joint Position controller
Dear all,
I need to simulate a velocity control of a UR5 robot in Gazebo + ROS. But current packages of UR only has a joint trajectory controller, But I want to control individual joint velocities over time.
How can I do this using existing c... | {
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"tags": "ros, gazebo, manipulator, ur5",
"url": null
} |
quantum-mechanics, quantum-field-theory, fermions, feynman-diagrams
Title: Minus Sign in Feynman Diagram I've been reading these notes and I can't figure out the why on P.120, it is said that
The fermionic statistics mean that the first diagram
has an extra minus sign relative to the ψψ scattering of Figure 25.
Wo... | {
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"tags": "quantum-mechanics, quantum-field-theory, fermions, feynman-diagrams",
"url": null... |
c++, c++11, binary-search-tree
/** DOCUMENTATION:
* PUBLIC: @name void ShelterBST::deleteNode()
* @brief Deletes the node with the specified name from the BST
* @param name The name of the pet in the node to be deleted.
*/
void ShelterBST::deleteNode(std::string name) {
TreeNode* deleted = deleteNode(root, name)... | {
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"url": null
} |
pid-control
Arduino library that you mentioned.
Python: GEKKO view demostration
Python: based on arduino-library view library
Web based on arduino-library: open online tool
Other softwares:
Matlab: check method
So, You need to choose the simplest based on your requirements. You may try with Ziegler–Nichols. Also yo... | {
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machine-learning, lstm, forecasting, attention-mechanism
For out of the box implementations https://github.com/huggingface/transformers is a good start. For handling larger values of N, I see both Longformer and BigBird mentioned there; the latter was used not just for text but for DNA sequencing. I'm not aware of any... | {
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• Yes, and this is what I am currently doing ( I called them cubic splines ) but it is the same thing. – ja72 May 24 '13 at 12:23
• @ja, no, they're not splines. Cubic splines necessarily have $C^2$ continuity, which is not the case here. – J. M. May 24 '13 at 12:24
• You are saying that cubic splines will deviate more... | {
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electromagnetism
Title: How do the spins of electrons line up in magnets? I understand that a magnetic effect is produced when the spins of electrons in an object line up. But why does this phenomenon occur? Are there some materials that cause this to occur? Because "It's complicated".
The reason lies in the interacti... | {
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newtonian-mechanics, fluid-dynamics, viscosity
C = 6πη r.
How does C depends upon fluid and geometry of body?
Why is it necessary for the sphere to move slowly and at low pressure to be have C = 6πη r?
What's the first principle? The viscuos force given in the cited equation for an sphere moving in a viscous fluid is ... | {
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "newtonian-mechanics, fluid-dynamics, viscosity",
"url": null
} |
rosnode, rosserial, roscpp
Title: Advertising new publisher after first spin in rosserial_windows
Apologies for the stupid question, but I'm still trying to grasp the basic concepts of rosnodes.
Is it possible to advertise a new publisher after the first spin? I'm currently using rosserial_windows and advertising a "... | {
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"tags": "rosnode, rosserial, roscpp",
"url": null
} |
binary-star, keplers-laws
Title: Calculating the separation of binary stars I'm struggling with the following problem:
An eclipsing binary has period 0.10 years and each component has speed in its orbit of 19AU per year (or 90km/s) Assuming both stars have the same mass and that their orbits are circular, calculate th... | {
"domain": "astronomy.stackexchange",
"id": 6598,
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"url": null
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regular-languages, finite-automata, closure-properties
This is not exact, since complemetation could also be only sub-exponential, but not polynomial.
As for a concrete example: Let $p_1,p_2,\dots$ be an enumeration of the prime numbers.
Consider the language: $L_k=\{1^n: \exists 1\le i\le k\ \text{ s.t. }\ p_i \not\m... | {
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"tags": "regular-languages, finite-automata, closure-properties",
"url": null
} |
medicine, skin, healing
Because the surface of the skin is no longer present, fluid (as with a blister, not containing red blood cells) leaks from the blood vessels. Initially a transudate, it can also be an exudate. And, no, it does not contain the cells needed to regenerate the upper layers of the skin. It contains ... | {
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"id": 5331,
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"tags": "medicine, skin, healing",
"url": null
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Alternatively: $$A^{-1}=\frac{\text{adj} (A)}{|A|}$$ Transpose: \begin{align}(A^{-1})^T&=\left(\frac{\text{adj}(A)}{|A|}\right)^T=\\ &=\frac{(\text{adj} (A))^T}{|A|}=\\ &=\frac{\text{adj} (A^T)}{|A|}=\\ &=\frac{\text{adj} (A^T)}{|A^T|}=\\ &=(A^T)^{-1}.\end{align} The following properties of adjoint and transpose were u... | {
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"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9678992923570261,
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"lm_q2_score": 0.8577681031721325,
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"openwebmath_score": 0.9372639060020447,
"tag... |
fft, discrete-signals, dft
$$ k F_s = N_1 f_1 \implies \frac{N_1}{k} = \frac{F_s}{f_1} ~~~, ~~~ m F_s = N_2 f_2 \implies \frac{N_2}{m} = \frac{F_s}{f_2}$$
Then the minimum integer $N_1$ and $N_2$ are found as :
$$ \boxed{ N_1 = \frac{F_s}{\text{gcd}(F_s,f_1)} = \frac{\text{lcm}(F_s,f_1)}{f_1} ~~~,~~~ N_2 = \frac{F_s}{... | {
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"openwebmath_score": null,
"tags": "fft, discrete-signals, dft",
"url": null
} |
homework-and-exercises, electromagnetism
Title: Ampere's loop inside capacitor
The figure is a view of one plate of a parallel-plate capacitor from within the capacitor.
In the question, we are required to rank the 4 paths (a, b, c and d) according to the value of $\oint B\cdot ds$.
I thought that all 4 paths are t... | {
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"tags": "homework-and-exercises, electromagnetism",
"url": null
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algorithms, trees, binary-trees
Well, for the problems with fixed mode, the structures can be implied easily, like the problems in OI or leetcode, however, in research such situation is not so likely to happen.
If the best probably answer is: well, when you feel some structures are proper, you can try them, it is hard... | {
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"tags": "algorithms, trees, binary-trees",
"url": null
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quantum-mechanics, homework-and-exercises, operators, hilbert-space, linear-algebra
$$
\hat{H}|\psi\rangle = \hat{H}\left(|\phi\rangle - \Sigma_n|\chi_n\rangle\right)
= \hat{H}|\phi\rangle - \hat{H}\left(|\chi_1\rangle + |\chi_2\rangle + \dots \right)
$$
$$
= \hat{H}|\phi\rangle - \left(\hat{H}|\chi_1\rangle + \hat{H}... | {
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@Michael: Thanks; fixed. – Brian M. Scott Nov 10 '11 at 18:38
Thank you very much, I just look up the 68-95-99.7 rule. This is very useful for me. I don't know any of what you guys discuss in here before, maybe this is not in the standard syllabus in the country I took my undergrad. Thanks a lot for your help. – lnth N... | {
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"openwebmath_score": 0.8960348963737488,
"ta... |
c#, unit-testing
I would also change the variable names as Snowbear HIM-compiler said.
I like to keep guard conditions at the top where the cheapest is first. Also, providing exceptions makes it easier for the caller to know why something failed. If you want to switch it to a boolean success/fail, that could work as w... | {
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In your case you just have samples $\mathbf{x}_1 = (x_{11}, \dots, x_{n1})', \dots, \mathbf{x}_r = (x_{1r}, \dots, x_{nr})'$ and the corresponding means are $\bar{x}_1, \dots, \bar{x}_r$. You can apply the same property taking care of adding the sample subscript:
$$\sum_{i=1}^n (x_{ij} - \bar{x}_j) = n \bar{x}_j - n \... | {
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"openwebmath_score": 0.813508152961731,
"tags... |
image-processing, detection
As an alternative to implementing your own, you might take a look at the openCV implementation. You might be able to modify it for your needs.
The source is here for the cascade detector, which is the openCV Viola-Jones implementation. You will need to examine the area after the comment /... | {
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"tags": "image-processing, detection",
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} |
quantum-mechanics, measurements, measurement-problem, quantum-measurements
Title: Ideal quantum measurement Schlosshauer (in Decoherence and the Quantum-to-Classical Transition) defines ideal quantum measurement as a von-Neumann measurement in which
(1) the apparatus states correspond 1-to-1 to given system states (so... | {
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"tags": "quantum-mechanics, measurements, measurement-problem, quantum-measurements",
"ur... |
performance, beginner, php, sql, pdo
If tipo and entry_type are always ep and item respectively, declare them as the DEFAULT value for these columns in the schema.
With slug_url, again, I don't endorse the storage of static data in tables. The epNum value is stored elsewhere, and you can very easily hardcode the begi... | {
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"tags": "performance, beginner, php, sql, pdo",
"url": null
} |
lagrangian-formalism, symmetry, action, noethers-theorem, variational-calculus
&=\left[\frac{\partial \mathcal{L}}{\partial \phi}\bigg|_{(\phi(p),\partial\phi(p))}\cdot\delta\phi(p)+\frac{\partial \mathcal{L}}{\partial(\partial_{\mu}\phi)}\bigg|_{(\phi(p),\partial\phi(p))}\cdot \partial_{\mu}(\delta\phi)(p)\right]\,(d... | {
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"tags": "lagrangian-formalism, symmetry, action, noethers-theorem, variational-calculus",
... |
lagrangian-formalism, field-theory, variational-principle, action, boundary-terms
A_\nu^a-\partial_\nu A_\mu^a+gf^{abc}A_\mu^b A_\nu^c$ denotes the gluon field strength tensor, $A_\mu^a$ are the gluon gauge fields and $a,b,c$ denote the color index. Therefore, the action changes to \begin{eqnarray}S\to S^\prime &=& S+... | {
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"tags": "lagrangian-formalism, field-theory, variational-principle, action, boundary-terms"... |
java, performance, object-oriented, swing
//Not used
@Override
public void addTreeModelListener(javax.swing.event.TreeModelListener l) {}
//Overrides the original getChild so that the method returns the correct directory
@Override
public Object getChild(Object parent, int index) {
if(paren... | {
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"tags": "java, performance, object-oriented, swing",
"url": null
} |
c#, multithreading, socket, client
I strongly recommend you standardize your events, and if you're going to keep the class sealed, at least make it implement some IServer interface:
public interface IServer
{
/// <summary>
/// An event that is raised when a client successfully connects.
/// </summary>
... | {
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"tags": "c#, multithreading, socket, client",
"url": null
} |
radians, counterclockwise from the positive axis. Given the equation of a curve explicitly as y = f(x) or implicitly as g(x,y) = c, a constant, many properties of the curve can be determined easily by knowing its graph. It is easy-to-use and user-friendly. March 02, 2012 Types of Symmetry 1. If the equation of the curv... | {
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"id": null,
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"openwebmath_score": 0.8129591345787048,
"tags... |
# Directional derivatives for vector-valued functions
Do we only calculate directional derivatives for scalar-valued functions?
Is it not possible to calculate directional derivatives for vector-valued functions?
How about using the vector of directional derivatives of the components of the given vector function? Wo... | {
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"lm_q1_score": 0.9857180643966652,
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"lm_q2_score": 0.8128673246376009,
"openwebmath_perplexity": 906.1094401974101,
"openwebmath_score": 1.0000098943710327,
"tag... |
c++, beginner, error-handling, calculator, i18n
l2 = c;
}
else if (c > a && c > b) { // c is the largest side
lrgst = c;
l1 = a;
l2 = b;
}
else { // a = b = c
output("It's an equilateral triangle.\n", "\nC'est un triangle equilateral.\n");... | {
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"tags": "c++, beginner, error-handling, calculator, i18n",
"url": null
} |
mathematics, astronomy
I figure that this is a physics question and not a mathematics question as I am looking to describe a phenomenon that occurs in nature, which is only one of the infinite curves which could be described. If this question is better placed in mathematics.SE or astronomy.SE then it can be moved.
Tha... | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "mathematics, astronomy",
"url": null
} |
c++, windows, git
Title: Date of latest GitHub project release I needed a clean, simple and robust piece of code to retrieve the date of publication of the latest release of a given GitHub Project.
My constraints were that it needed to be written in the C++11 subset supported by Visual Studio 2012, and that it would r... | {
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"tags": "c++, windows, git",
"url": null
} |
performance, c, image, signal-processing, opencl
//This will serve as the output buffer for iqzz
cl_mem DCT_Input = clCreateBuffer(context, CL_MEM_READ_WRITE| CL_MEM_COPY_HOST_PTR, 64 * sizeof(cl_int), unZZ_MCU, &ret);
chk(ret, "clCreateBuffer");
//Output buffer
cl_mem DCT_Output = clCreateBuffer(context, CL_MEM_REA... | {
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"url": null
} |
Instead, I will do the problem in a somewhat different way, which in general is more efficient. It will turn out that a sign error crept into your calculation.
We have $$f(x)=-\frac{1}{x}-\frac{1}{x^2} + \frac{1}{x-1}$$ and want to express $f(x)$ as a sum of powers of $x-2$. It is useful, though not necessary, to let ... | {
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"lm_q1_score": 0.9802808736209154,
"lm_q1q2_score": 0.8082042511134966,
"lm_q2_score": 0.8244619199068831,
"openwebmath_perplexity": 257.3141293055222,
"openwebmath_score": 0.9284504652023315,
"tag... |
neutrinos, neutrons, neutron-stars
Title: Can we create sheet of neutron I want to know are there any theory or technology to create a neutron matter like neutron star on earth. Even a tiny thin sheet like graphene | {
"domain": "physics.stackexchange",
"id": 25625,
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"tags": "neutrinos, neutrons, neutron-stars",
"url": null
} |
gravity, dark-matter, galaxy-rotation-curve, modified-gravity
Title: Is there an alternative to dark matter? I've been reading about dark matter. I understood that its existence is inferred by the discrepancy between the gravity exerted by a galaxy (total mass) and the movement of the stars that compose it.
In other ... | {
"domain": "physics.stackexchange",
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"openwebmath_score": null,
"tags": "gravity, dark-matter, galaxy-rotation-curve, modified-gravity",
"url": null
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coreflexive), and there are relations which are neither symmetric nor antisymmetric (e.g., the "preys on" relation … bcmwl-kernel-source broken on kernel: 5.8.0-34-generic. Click hereto get an answer to your question ️ Given an example of a relation. Or does it have to be within the DHCP servers (or routers) defined su... | {
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"lm_q1_score": 0.9674102533547799,
"lm_q1q2_score": 0.801923908706167,
"lm_q2_score": 0.8289388146603365,
"openwebmath_perplexity": 646.0591191103607,
"openwebmath_score": 0.5723953247070312,
"tags"... |
is notated A’, or Ac, or sometimes ~A. If you have n number of events and you are asked to find when at least one of them occurs you have to use union. This is because probabilities are numbers between$0$and$1$. A union is often thought of as a marriage. Highlight and click Insert to place it in Text Edit. Calculating ... | {
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"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9752018390836984,
"lm_q1q2_score": 0.816848530672332,
"lm_q2_score": 0.8376199653600371,
"openwebmath_perplexity": 463.6653691358345,
"openwebmath_score": 0.638903260231018... |
c++, matrix, mathematics, c++14, opengl
struct Matrix4x4
{
GLfloat m_elements[16];
Matrix4x4();
Matrix4x4(GLfloat elements[]);
GLfloat* GetElementsPointer();
static Matrix4x4 CreateScale(Vector4 scale);
static Matrix4x4 CreateTranslation(Vector4 translation);
static Matrix4x4 CreateRotatio... | {
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"tags": "c++, matrix, mathematics, c++14, opengl",
"url": null
} |
javascript, recursion, sudoku, community-challenge
All in all, the only things i can find to criticize are some naming conventions, formatting, and some pedanticness that is really minor. It's a great solution to the problem. Thanks | {
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"tags": "javascript, recursion, sudoku, community-challenge",
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# T/F: if $\int_{1}^{\infty}f(x)dx$ converges then $\lim_{x\to\infty}f(x) = 0$. [duplicate]
I was asked to prove or disprove the following:
If $\int_{1}^{\infty}f(x)dx$ converges then $\lim_{x\to\infty}f(x) = 0$.
I said that this is false and gave this example:
$f(x) = \left\{ \begin{array}{ll} 1 & \mbox{if } x \in... | {
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"openwebmath_score": 0.758170485496521,
"tags... |
recursion, integer, elixir
Naming and Syntax better practices (usage of parenthesises, variable names etc.)
Usage of |> (pipe) in this context. Would you ever see it used the way I did it in production code? Should I switch to "normal" notation instead?
Less verbose or more elegant way to avoid the seemingly unaesthet... | {
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"tags": "recursion, integer, elixir",
"url": null
} |
thermodynamics, temperature
If it's not possible, then how can we talk about infinite temperature? The point is that a system cannot be heated above the Planck temperature, which does not necessarily preclude systems from existing at a higher temperature (effectively $\infty$, here), just like the impossibility to acc... | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "thermodynamics, temperature",
"url": null
} |
3. If you are interested in seeing how that works you. A Taylor series isn't really a good way to compute this function unless you're looking for asymptotic accuracy around a particular point, rather than general accuracy along the whole thing. Sequences and series • A sequence is a (possibly infinite) collection of nu... | {
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"lm_q1_score": 0.9926541742947811,
"lm_q1q2_score": 0.872688700728175,
"lm_q2_score": 0.8791467595934565,
"openwebmath_perplexity": 580.3439812060044,
"openwebmath_score": 0.8485816717147827,
"tags": nul... |
complexity-theory, turing-machines, computability, programming-languages, turing-completeness
Title: Explain the difference between Turing Complete and Turing Equivalence I'm not sure if I understand the difference between Turing Complete and Turing Equivalent programming languages.
A computational system that can co... | {
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"tags": "complexity-theory, turing-machines, computability, programming-languages, turing-comple... |
photons, quantum-electrodynamics, scattering
Shouldn't that interaction be understood as "virtual photons" exchange between real photon and electron?
The interaction is at the vertices. It is the electron that becomes virtual in this diagram, i.e. it is off mass shell but still has the electron quantum numbers. It is... | {
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"openwebmath_score": null,
"tags": "photons, quantum-electrodynamics, scattering",
"url": null
} |
That is the result I got. Please correct me where is needed.
Drey’s notation “P(B)<3” is confusing; taken literally, it means that the probability of the complementary event is less than 3. He may mean the probability that the sum of the numbers on the dice is less than 3, as that is a way to describe the complementa... | {
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"lm_q1_score": 0.9891815491146485,
"lm_q1q2_score": 0.8465921560947521,
"lm_q2_score": 0.8558511396138365,
"openwebmath_perplexity": 333.2925444631537,
"openwebmath_score": 0.7281996607780457,
"ta... |
file-system, go
My original problem seemed to stem from using os.FileInfo objects directly. Every polling period would show all the files as "new." I'm not sure how Go handles identity in maps (in Python I could implement __hash__ to tell it how to behave) but as long as the file has the same name and the same size in... | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "file-system, go",
"url": null
} |
rospack
Title: rospack coudn't find package
Hi,
I am new in ros and ubuntu. After I made full installation I tried a "rospack find roscpp" command and the answer was "couldn't find the package". what's the problem?
thanks
Originally posted by SHPOWER on ROS Answers with karma: 302 on 2012-04-18
Post score: 0
Origin... | {
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"tags": "rospack",
"url": null
} |
java, role-playing-game
You also don't need two Scanner objects for System.in. One is plenty and is less likely to lead to confusion.
Since the Scanner is going to stay the same for the life of the program, we can make it final.
As previously said, we only need one Scanner for each stream. We only need multiple ... | {
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"openwebmath_score": null,
"tags": "java, role-playing-game",
"url": null
} |
c#, .net, recursion, xamarin
if (PinCode.Length == 3)
{
PinNumberFour = "_";
}
else if (PinCode.Length == 2)
{
PinNumberFour = "_";
PinNumberThree = "_";
}
else if... | {
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"openwebmath_score": null,
"tags": "c#, .net, recursion, xamarin",
"url": null
} |
python, beginner, console, csv, hash-map
Anytime you find yourself repeating code, it'd be helpful to write a function instead. Something like:
def ask_boolean_question(prompt):
answer = ''
while answer not in yes_no:
answer = generic_prompt(prompt)
return answer == 'yes'
Now your c... | {
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"tags": "python, beginner, console, csv, hash-map",
"url": null
} |
*****Select EMPOWERgmat Courses now include ALL 6 Official GMAC CATs!*****
Director
Joined: 10 Mar 2013
Posts: 504
Location: Germany
Concentration: Finance, Entrepreneurship
GMAT 1: 580 Q46 V24
GPA: 3.88
WE: Information Technology (Consulting)
Pat bought 5 pounds of apples. How many pounds of pears [#permalink]
Show... | {
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"lm_q1_score": 0.9496693645535724,
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"openwebmath_score": 0.46849584579467773,
"tags": ... |
performance, vba, excel
.Add "Plaintiff_Law_Firm"
.Add "Asbestos_Type"
.Add "Evaluation_Date"
.Add "Tier"
.Add "Data_Source"
.Add "Data_Source_Category"
.Add "Jurisdiction/County"
.Add "Settlement_Demand"
.Add "Jury_Verdict"
.Add "Exposure_Site"
... | {
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"openwebmath_score": null,
"tags": "performance, vba, excel",
"url": null
} |
You are here : Control System Design - Index | Book Contents | Chapter 9
9. Frequency Domain Design Limitations
Preview
Chapter 8 showed, via elementary time domain arguments based on the Laplace transform, that fundamental limitations exist on the achievable performance of linear control systems. For example, it wa... | {
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"lm_q2_score": 0.8354835411997897,
"openwebmath_perplexity": 727.4150811819243,
"openwebmath_score": 0.8211777806282043,
"tags": null,
... |
arduino, motor, raspberry-pi, battery
Title: What does internal sparking in a motor mean? My Arduino + Raspberry Pi robot was working fine in the morning. I tested it, it ran perfectly, and then I switched it off.
Now in the evening when I'm trying to run it again, with the same batteries and everything, it just does... | {
"domain": "robotics.stackexchange",
"id": 1119,
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"openwebmath_score": null,
"tags": "arduino, motor, raspberry-pi, battery",
"url": null
} |
ros, c++, serial, frequency
Title: Serial Load Cell is slow in ROS
Hi all,
So I have these load cells (4 of them) for which I have written a nice C++ class wrapper to interface with the sensors in a ROS environment. I have 4 topics, called "loadSensorX" where X = 0,1,2,3. These topics publish the force felt by these ... | {
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"id": 12323,
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"lm_q2_score": null,
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"openwebmath_score": null,
"tags": "ros, c++, serial, frequency",
"url": null
} |
rviz
[ INFO] [1482424511.729102000]: Particle Emitter Type 'Cylinder' registered
[ INFO] [1482424511.729130000]: Particle Emitter Type 'Ring' registered
[ INFO] [1482424511.729159000]: Particle Emitter Type 'HollowEllipsoid' registered
[ INFO] [1482424511.729187000]: Particle Affector Type 'LinearForce' registered
[ I... | {
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"id": 26558,
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"lm_q2_score": null,
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"openwebmath_score": null,
"tags": "rviz",
"url": null
} |
machine-learning, data-cleaning, feature-engineering, feature-extraction, feature-scaling
Title: Feature engineering for categorical variables I have some categorical variables in my dataset for a regression problem.
1) One of the variable can take 3 values (Girls, Boys, Girls&Boys). Converting it into one-hot encodin... | {
"domain": "datascience.stackexchange",
"id": 5430,
"lm_label": null,
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"tags": "machine-learning, data-cleaning, feature-engineering, feature-extraction, featu... |
python, numpy
n_matches = np.count_nonzero(~(a1 | a2))
return n_matches / np.sqrt(n1 * n2)
def test() -> None:
methods = (function_1_old, function_1_arith, function_1_bool, function_1_demorgan, function_1_count,
function_1_binary)
a1 = np.array((0, 1, 1, 0, 1, 0, 1), dtype=bool)
a2 = np... | {
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"id": 42679,
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"openwebmath_score": null,
"tags": "python, numpy",
"url": null
} |
thermodynamics, entropy
If you re-read your link, you will see that Feynman did not say that. What you left out of your description is that Feynman explicitly specified that his equation applied to a reversible path. [The difference between $Q$ and $Q_{rev}$ is not a minor typo. Rather, it is crucial to understanding... | {
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"openwebmath_score": null,
"tags": "thermodynamics, entropy",
"url": null
} |
javascript, beginner, design-patterns
} else {
console.log("Browser doen not support HTML5 Web Storage");
}
}
return {
set: function (key, value) {
return saveItem(key, value);
},
get: function () {
return getItem(key, item);
},
... | {
"domain": "codereview.stackexchange",
"id": 16423,
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"openwebmath_score": null,
"tags": "javascript, beginner, design-patterns",
"url": null
} |
• You may find something interesting here:en.wikipedia.org/wiki/E_(mathematical_constant) – NoChance Feb 8 '16 at 14:41
• The range of $2^{2^x}-2^x$ is $[\log_2(e)-\log_2(\log_2(e)),\infty)$. – Akiva Weinberger Feb 8 '16 at 16:25
• From the prime number theorem, if $P(x)$ is the product of the primes less than $x$ then... | {
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"lm_q1q2_score": 0.8275862356767318,
"lm_q2_score": 0.8418256412990657,
"openwebmath_perplexity": 403.5008203022484,
"openwebmath_score": 0.8819941282272339,
"tag... |
transformer, machine-translation, text-generation, bart, pretraining
Title: Question of pretraining text-generation task, it seems that pretraining is not work for a small model? My task is to generate keywords from sentences.
I pretrain a text-generation model. I mask the sentences' tokens and predict the whole sente... | {
"domain": "datascience.stackexchange",
"id": 8125,
"lm_label": null,
"lm_name": null,
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"openwebmath_score": null,
"tags": "transformer, machine-translation, text-generation, bart, pretraining",
"url":... |
java, game
Title: Hearthstone Style Deck Stats for TCG Right now I have this messy method to collect the deck statistics while building a window that will display those statistics. These statistics are things like the type and mana cost of the card. I know that this method is too large, so I would like to get some a... | {
"domain": "codereview.stackexchange",
"id": 10440,
"lm_label": null,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "java, game",
"url": null
} |
javascript, algorithm, programming-challenge, functional-programming, ecmascript-6
the origin where it started. Therefore, we return true.
Example 2:
Input: "LL" Output: false Explanation: The robot moves left twice. It
ends up two "moves" to the left of the origin. We return false because
it is not at the origi... | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "javascript, algorithm, programming-challenge, functional-programming, ecmascrip... |
image-processing, matlab, noise
A common method for testing denoising filters is to start with a pure image (one that you define yourself), then add noise to it artificially then compare the denoised version to the original. You will need to make sure to add the correct type of noise for your context (is it simple Ga... | {
"domain": "dsp.stackexchange",
"id": 772,
"lm_label": null,
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"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "image-processing, matlab, noise",
"url": null
} |
reference-request, career
For example for a beginner in statistics the last chapter of Schaum's Outline of Statistics, 6th Edition Take Chapter 18 Statistical Process Control and Process Capability This method is used for quality control or best said by the book:
18.1 GENERAL DISCUSSION OF CONTROL CHARTS | {
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"tags": "reference-request, career",
"url": null
} |
quantum-mechanics, photons, electrons, photoelectric-effect
The intuitive reason is, that the linear process (an electron absorbs one photon) is more or less "unlikely" (as the coupling between the em. field and electrons is rather weak), so a process where two photons interact is "unlikely"$^2$ and thus strongly supp... | {
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"id": 90826,
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "quantum-mechanics, photons, electrons, photoelectric-effect",
"url": null
} |
mars, venus, mercury
Title: Can we find rocks from Venus or Mercury on Earth? As we know, we can find rocks from Mars on Earth, how about Venus and Mercury? Is that not found yet? Or it is impossible to find them because they are closer to the Sun, and debris won't go far away from the Sun? You can think of it in term... | {
"domain": "astronomy.stackexchange",
"id": 1443,
"lm_label": null,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "mars, venus, mercury",
"url": null
} |
electromagnetism, general-relativity, forces, gravity, interactions
My understanding of GR is that it details how gravity can be modeled by describing spacetime with geometric equations and deriving motion from those:
$$R_{\mu \nu} - {1 \over 2}R \, g_{\mu \nu} + \Lambda g_{\mu \nu}= {8 \pi G \over c^4} T_{\mu \nu}$$ | {
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"tags": "electromagnetism, general-relativity, forces, gravity, interactions",
"url": nul... |
c++, iterator, vectors
But that is a little bit like actual hard work. The designers of the STL actually got smart and the default implementation of this type refer back to the iterator type to get these types. So you can define these types in your iterator (and not define a specialization of the iterator_traits class... | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "c++, iterator, vectors",
"url": null
} |
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