text stringlengths 1 1.11k | source dict |
|---|---|
javascript, jquery, css, html5, twitter-bootstrap
Why not use that choices variable that you spent so much time creating?
Please show your ID - er, class, I mean
Check here:
...'" id="option' + i + '">...
This is not the point of IDs. IDs in HTML are meant for specific, unique, and special elements. If you have to ... | {
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"openwebmath_score": null,
"tags": "javascript, jquery, css, html5, twitter-bootstrap",
"url": null
} |
c#, beginner, object-oriented, entity-framework-core
File structure
Example
int id = 22; // some id of selected contract from user
Exporter exporter = new Exporter();
exporter.Contract.Export(id);
// or
// exporter.ActCompletion.Export(id);
UPDATE
I created a database in MS Access (with the extension .accdb). The pr... | {
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"tags": "c#, beginner, object-oriented, entity-framework-core",
"url": null
} |
The following code is my first attempt to set up the visualization I want to get:
Manipulate[
Plot[{Abs[x],
1/(2 \[Lambda]) * (Abs[x]^2 - Max[Abs[x]^2 - 2 \[Lambda], 0]),
1/(2 b) * (Abs[x]^2 - Max[Abs[x] - b, 0]^2)}, {x, -2,
2}] , {\[Lambda], 1/1000, 1}, {b, 1/1000, 1}]
• Thank you @dionys for editing, I hope my Engl... | {
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"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9869795114181105,
"lm_q1q2_score": 0.838904133794533,
"lm_q2_score": 0.8499711737573762,
"openwebmath_perplexity": 2166.8605652172278,
"openwebmath_score": 0.35336971282958984,
"ta... |
organic-chemistry, physical-chemistry, analytical-chemistry, spectroscopy
The amount of analyte would be tinytiny. Likely impossibly small for NMR, even with hyperpolarisation. Certainly too small with mass spectrometry.
Other point: Why? GC is not useful for complex molecules, because the have very little vapour pres... | {
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"tags": "organic-chemistry, physical-chemistry, analytical-chemistry, spectroscopy",
"ur... |
java, multithreading, android, animation, collision
How do I re-construct it better and how can I put thread class outside? I really don't like having the thread class inside the activity class. The code seems to be working for now, but I really want to make it better! What can I do about it?
How do I re-construct it... | {
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"tags": "java, multithreading, android, animation, collision",
"url": null
} |
python
How can i adjust this so that all values get printed onto the file? Don't forget to open the file first..
Py 2.6
For item in list:
the_opened_file.write("%s\n" % item)
Py 3.x
with open(filepath,'w') as fileptr:
for item in list:
fileptr.write("{}\n".format(item))
If you want to save your list... | {
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"openwebmath_score": null,
"tags": "python",
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python, neural-network, regression, keras, cross-validation
2 - Load the dataset
boston = load_boston()
X = boston.data[:,0:13]
Y = boston.target
3 - Define base model
def baseline_model():
# create model
model = Sequential()
model.add(Dense(13, input_dim=13, \
kernel_initializer='norm... | {
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"tags": "python, neural-network, regression, keras, cross-validation",
"url": null
} |
python, strings, python-3.x
# Creating a variable to allow me to efficiently index a string of any length
i = len(x) - 1
# Using a recursive formula and checking for the base case when the string is of less than one character
if len(x) <= 1:
return True
# This the recursive portion of the formu... | {
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"openwebmath_score": null,
"tags": "python, strings, python-3.x",
"url": null
} |
ros, urdf, beginner-tutorials
The idea is to copy the URDF created before "whereever" to the new urdf directory you created, i.e. to ~/catkin_ws/src/testbot_description/urdf.
Sources are usually put in the src directory of a package, so you should end up with parser.cpp in ~/catkin_ws/src/testbot_description/src and ... | {
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"tags": "ros, urdf, beginner-tutorials",
"url": null
} |
multithreading, sorting, rust, thread-safety
Usually, I'd simply use the .sorted() operation of the vector. But as this is an exercise, you probably want to implement it yourself, so here I demonstrate you how it would be implemented with iterators. Again, iterator has a .is_sorted() operation, which we will ignore. T... | {
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"openwebmath_score": null,
"tags": "multithreading, sorting, rust, thread-safety",
"url": null
} |
homework-and-exercises, general-relativity, differential-geometry, tensor-calculus, vector-fields
Where you went 'wrong'
Note that in your calculation, you stopped at $(*)$, i.e the expression you found is the component of a $2$-form (the coefficient of $dr\wedge d\theta$). Inherently, there's nothing wrong with that,... | {
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"openwebmath_score": null,
"tags": "homework-and-exercises, general-relativity, differential-geometry, tensor-calculus... |
newtonian-mechanics, acceleration, inertial-frames, sensor
Experimental environment & description
I use a the crazyflie quadrotor's accelerometers as the experimental accelerometer. The measures are taken at $T = 10 \textrm{ms}$
Since I need angular velocity and a constant linear velocity I decided to not turn the qua... | {
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"openwebmath_score": null,
"tags": "newtonian-mechanics, acceleration, inertial-frames, sensor",
"url": null
} |
measurement, swap-test
Title: Swap test vs measurement in a specific basis I have two states $|\psi\rangle$ and $|\phi\rangle$. The swap test allows to estimate $|\langle \psi | \phi \rangle|^2$ by using the controlled SWAP gate and a couple of Hadamard gates. To obtain the estimate we repetitively measure the first q... | {
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"tags": "measurement, swap-test",
"url": null
} |
25. Ángel Méndez Rivera says:
Anthony,
(1.1)(0.9) = 0.99
(1.11)(0.9) = 0.999
(1.111)(0.9) = 0.9999
(1.111…)(0.9) = 0.999…. = (1/0.9)(0.9), because 1.1111… = 1/0.9. But any number divided by itself equals 1, so (0.9)/(0.9) = 1, therefore 1 = 0.9999….
26. Anthony.R.Brown says:
Quote: “Joshua says:
You would be cor... | {
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"openwebmath_score": 0.7499731779098511,
... |
softmax, graph-neural-network
h1 =[-1.2,2.3]
q~ = [.0293,.9797]
q =[.03,.99] (assuming e =.001)
Apply threshold (0.5)
r =[0,1]
Fuzzy encoding will be helpful when all classes have value below threshold. For eg:
h =[1,1,1,1,1,1,1,1,1,1]
q~ = [.1,.1,.1,.1,.1,.1,.1,.1,.1,.1]
q = [.99,.99,.99,.99,.99,.99,.99,.99,.99... | {
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"tags": "softmax, graph-neural-network",
"url": null
} |
simple to confirm: you just use polynomial long division. Find a simple formula. After many searches I couldn't find a single page containing summation formulas for polynomials of order greater than 4. Popular Problems. Poisson summation formula listed as PSF. Author information: (1)Department of Mathematics, Carnegie-... | {
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"lm_q1_score": 0.9814534316905263,
"lm_q1q2_score": 0.8220849795093139,
"lm_q2_score": 0.8376199552262967,
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"openwebmath_score": 0.874673068523407,
"... |
2020 how to use stirling's approximation | {
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"lm_q2_score": 0.8459424314825853,
"openwebmath_perplexity": 854.986277965422,
"openwebmath_score": 0.9655378460884094,
"tags": nul... |
quantum-mechanics, experimental-physics
From my earlier post: time of photon emission and part of the answer I received.
"An individual atom with its electron in an excited state may emit the photon at an arbitrary time t. One has to take a large sample of atoms with the electrons at that energy level and measure the... | {
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"tags": "quantum-mechanics, experimental-physics",
"url": null
} |
ros-kinetic, turtlebot3
Originally posted by Orhan on ROS Answers with karma: 856 on 2017-03-23
Post score: 0
Finally I found simple one :D
ROBOTIS - TurtleBot3
The steps below works fine now, anyway they can be improve or change the repositories. I definitely suggest to follow the link above.
The Tutorials teaches i... | {
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} |
c#, console, error-handling
case OnErrorEventsArgs.ShowExceptionLevel.Debug:
if (e == null)
{
Logger.Debug("\n[{0}] {1}", DateTime.Now.ToShortTimeString(), verboseMessage);
Console.WriteLine("\n[{0}] {1}", DateTime.Now.ToShortTimeString(), verboseMessage);
... | {
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"tags": "c#, console, error-handling",
"url": null
} |
homework-and-exercises, fluid-dynamics, lift
Putting all of this together results in a quadratic equation that results in essentially the same velocity over the top as was given for the bottom (our result was 97.02 m/s).
This of course was not the answer expected which is why I am asking for help? What did I do incor... | {
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"tags": "homework-and-exercises, fluid-dynamics, lift",
"url": null
} |
ros, ros-kinetic, laserscan, pointcloud
Comment by Delbina on 2022-08-08:
@Ravi Joshi ,
sorry, is there any way to first remove/or filter the environment noise from the point cloud, and then convert the point cloud to the laser scan data?
becasue when i convert the pointcloud into laser scan, it provides me the ranges... | {
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We need to be very careful about the ranges while dealing with Inverse Trigonometric Functions(Statement)
Let $$\arccos x=u\implies0\le u\le\pi,$$
$$x=\cos u,\sin u=+\sqrt{1-x^2}$$
$$f(x)=\arccos\left(\dfrac{\cos u+\sin u}{\sqrt2}\right)=\arccos\left(\cos\left(u-\dfrac\pi4\right)\right)$$
Now $$-\dfrac\pi4\le u-\df... | {
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"lm_q1_score": 0.9603611654370414,
"lm_q1q2_score": 0.8219262084730765,
"lm_q2_score": 0.8558511506439707,
"openwebmath_perplexity": 314.02625464844454,
"openwebmath_score": 0.8897454142570496,
"ta... |
condensed-matter, topological-insulators, graphene, topological-phase
As I understand, the authors are considering what happens if there is a voltage across the graphene sample. They imagine to shape the sample into a cylinder, and think the voltage to be induced by a slowly increasing magnetic flux inserted down the ... | {
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"tags": "condensed-matter, topological-insulators, graphene, topological-phase",
"url": n... |
mechanical-engineering
source
I assume those supports in the first figure are pins so there are 4 reactions in total.
And as shown in the second figure, there are 3 reactions in total.
I thought for a structure in plane to be statically determinate, it must have only 3 reactions, but these are quite contradictory to m... | {
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"lm_q2_score": null,
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"tags": "mechanical-engineering",
"url": null
} |
c++, coordinate-system, linear-algebra
// Not in place
friend constexpr vector vector_triple_product(const vector& first, const vector& other2,
const vector& other3)
requires (Size == 3
and not is_complex<T>::value) {
vector temp{ first };
vector temp3{ othe... | {
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haxe, haxeflixel
Player.hx
package;
import flixel.FlxSprite;
import flixel.FlxG;
import flixel.util.FlxColor;
class Player extends FlxSprite
{
public function new(X:Float,Y:Float)
{
super(X,Y);
makeGraphic(20,100,FlxColor.WHITE);
}
override public function update(elapsed:Float):Void
... | {
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### Local Function | {
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"openwebmath_score": 0.8319073915481567,
"tags": n... |
velocity, relative-motion
The result is the same for the opposite direction, when to an outside observer the ball may be seen to be moving "slower", but then the wall it is beiong thrown at is moving towards the ball at the exact rate that the ball has been "slowed". Therefore, the time remains the same as if the box... | {
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"openwebmath_score": null,
"tags": "velocity, relative-motion",
"url": null
} |
ros2
Comment by amosteo on 2018-05-23:
Ah, great. Then I will take the easy route, thanks.
Comment by esteve on 2018-06-10:
Wasn't the mechanism in REP-149 only used for typesupports? It seems to me that messages still depend on rosidl_default_generators, hence the patch to add the ros2_java generator.
Comment by Dirk... | {
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"tags": "ros2",
"url": null
} |
mathematics, quantum-operation
Title: Equivalence of two ways to recover a map from its Choi state Let $\Phi\in\mathrm T(\mathcal X,\mathcal Y)$ be a quantum channel, $\Phi:\mathrm{Lin}(\mathcal X)\to\operatorname{Lin}(\mathcal Y)$.
We define its Choi representation as the operator $J(\Phi)\in \mathrm{Lin}(\mathcal{Y}... | {
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"openwebmath_score": null,
"tags": "mathematics, quantum-operation",
"url": null
} |
lagrangian-formalism, field-theory, boundary-conditions, variational-principle, variational-calculus
Can someone explain to me the identification of the terms $\delta S_V$ and $\delta S_{\partial V}$ and why we should, in the derivation of the field equation, require $\delta S_{\partial V}=0$? The normal thing done in... | {
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"tags": "lagrangian-formalism, field-theory, boundary-conditions, variational-principle, v... |
c#, bitwise, bitset
10101010 10000001 00000000 00000000 // data
00000000 00000000 10101010 10000001 // data right-shifted by 16 (size * index)
00000000 00000000 10101010 10000001 // data right-shifted by 16 (size * index)
00000000 00000000 00000000 11111111 // mask
----... | {
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"tags": "c#, bitwise, bitset",
"url": null
} |
numpy, linear-algebra
a1=1
b1=4
a2=3
b2=2
x, y = meeting_lines(a1, b1, a2, b2)
print(x, y)
which outputs:
1.0 5.0 | {
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"tags": "numpy, linear-algebra",
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} |
computational-chemistry, software, cheminformatics, conformers
Title: Trying to understand SMILES(?) patterns In the example calculation from the conformer search package fafoom is a mysterious pattern that I'd like to understand.
The SMILES code of the given example structure is:
CC(=O)N[C@H](C(=O)NC)C
There is a fi... | {
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"openwebmath_score": null,
"tags": "computational-chemistry, software, cheminformatics, conformers",
"url": null
} |
optimization, distributed-systems, parallel-computing, scheduling
Title: Distributed parallel computing algorithms for content dependent data I have implemented group of pictures parallelism for hevc encoding on distributed platform. In this we have to send different video chunks to different machines, these machines ... | {
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"openwebmath_score": null,
"tags": "optimization, distributed-systems, parallel-computing, scheduling",
"url": null
} |
python, pandas
Title: String to Data frame column I have 2 column in data frame, X and Y. And I have some string values stored in text, which I want to put in X, Y as shown in the example.
Example :
text=9 10 13 110 14 16
12 1 6 1 1 2
X Y
9 12
10 1
13 6
110 1
14 1
16 2 If you are lookin... | {
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"tags": "python, pandas",
"url": null
} |
classical-mechanics, lagrangian-formalism, differential-geometry, momentum, hamiltonian-formalism
Title: Help with geometric view of conjugate momenta and Legendre transformation I'm familiar with the ''coordinate view'' of Lagrangian and Hamiltonian mechanics where if $\pmb{q}=(q^1,\dots, q^n)\in\mathbb{R}^n$ are any... | {
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"tags": "classical-mechanics, lagrangian-formalism, differential-geometry, momentum, hamilt... |
botany, plant-physiology
Title: Why are some plants frost tender? Why do some plants have the ability to stand frost, while others can't? Does it have to do with the size of the water vacuoles in the plant cells? All cells are susceptible to cold, but freezing is particularly difficult. If the water in the cells free... | {
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"tags": "botany, plant-physiology",
"url": null
} |
c++, programming-challenge, time-limit-exceeded, stack, queue
Intrigued? Great. So let's check flip:
void Queue::flip() {
while(not in.empty()) {
out.push(in.top());
in.pop();
}
}
flip takes all elements in in and moves them to out. It thereby changes the order of the elements, so that the top... | {
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"tags": "c++, programming-challenge, time-limit-exceeded, stack, queue",
"url": null
} |
thermodynamics, carnot-cycle
I understand step 1, 2, and 3; however, step 4 and 5 I don't grasp. I know that The first steps entail expanding a gas while keeping it at the same temperature, opening the intake valve in order to use the expanding gas to move a piston and do work, and I understand that, according to the ... | {
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"tags": "thermodynamics, carnot-cycle",
"url": null
} |
python, python-2.x, sorting
TEMPLATE = [[filter(criterion) for criterion in row] for row in [
[1],
['Striped', 'Striped'],
['Solid', 8, 'Solid'],
['Striped', 'Solid', 'Striped', 'Striped'],
['Solid', 'St... | {
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"tags": "python, python-2.x, sorting",
"url": null
} |
physical-chemistry, analytical-chemistry, crystal-structure, materials
I suppose this is largely a set of questions about machining and metrology, but materials science is important too. Also, because of the relevance to the redefinition of $N_\text{A}$ I thought it appropriate for this site. With all due respect for ... | {
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"tags": "physical-chemistry, analytical-chemistry, crystal-structure, materials",
"url"... |
special-relativity, reference-frames, faster-than-light, relative-motion, machs-principle
2) I know that even such speeds of 10^18 m/s are not in contradiction with relativity because a limiting velocity only exists for exchange of information, which apparantly does not occur.
Still: could anybody explain why such biz... | {
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"tags": "special-relativity, reference-frames, faster-than-light, relative-motion, machs-prin... |
Here $y=8$
$$S_5=\int\limits_0^{\sqrt{9-x^2}}\int\limits_0^3 (2x+8)\, dx\, dz$$
Conversion to Polar coordinates
$dx\,dz=r\,dr\,d\theta$, $x=r\cos{\theta}$, $z=r\sin{\theta}$
$$S_5=\int\limits_0^{\pi/2}\int\limits_0^3 (2r\cos{\theta}+8)\, r \, dr\, d\theta$$
$$S_5=\int\limits_0^{\pi/2}\int\limits_0^3 (2r^2\cos{\the... | {
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"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9877587239874877,
"lm_q1q2_score": 0.8231236450658642,
"lm_q2_score": 0.8333246015211009,
"openwebmath_perplexity": 424.7781298680704,
"openwebmath_score": 0.9121850728988647,
"tag... |
programming, ibm-q-experience, simulation
Title: Can I extract information from a single shot efficiently? I'm running a quantum simulation and want to obtain some information from a single shot of an experiment. Here's part of the code I'm working on:
for i in range(Nshot):
Expeb = []
for measure_circuit in [... | {
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"tags": "programming, ibm-q-experience, simulation",
"url": null
} |
algorithms, graphs
https://stackoverflow.com/questions/19404033/all-pairs-maximally-disjoint-paths-algorithm/19411277#19411277
If anyone could point me towards proofs or papers that discuss this problem I would appreciate it. Your link refers to edge-disjoint paths -- i.e., vertices can visited by multiple paths, but ... | {
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"tags": "algorithms, graphs",
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## Numerical Approximation of Convolution
In this section, let us apply the LabVIEW MathScript function conv to compute the convolution of two signals. One can choose various values of the time interval ΔΔ size 12{Δ} {} to compute numerical approximations to the convolution integral.
### Convolution Example 1 | {
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"openwebmath_score": 0.6266806721687317,
"tags": null,
... |
beginner, php, html, security
//Adds text
imagestring($img, $fontSize, $upperLeftCornerX, $upperLeftCornerY, $random . " = ?", $textColor);
//Adds random lines to the images
for($i = 0; $i < 5; $i++) {
imagesetthickness($img, rand(1, 3));
$x1 = rand(0, $width / 2);
... | {
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"openwebmath_score": null,
"tags": "beginner, php, html, security",
"url": null
} |
formal-charge
Can a neutral molecule have nonzero formal charges?
Yes, individual atoms of a molecule can have nonzero formal charges, as the examples in the comments show. However, the sum of the formal charges should be zero if the Lewis structure is drawn correctly.
Why so complicated?
You could just count all the... | {
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"tags": "formal-charge",
"url": null
} |
c#, performance, reflection
Full Executable sample:
//using Hyper.ComponentModel;
using System;
using System.ComponentModel;
using System.Diagnostics;
using System.Reflection; | {
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"tags": "c#, performance, reflection",
"url": null
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c, bitwise, embedded
Notice that only the 0x1 bit is different in each case. Because of this, you can first generate this one which has its 0x1 bit cleared:
genMask((xm>>1)&0xfffffffe);
and then you can compute the other ones based on what their 0x1 bit will be.
So your code would become:
static inline void genPWM(u... | {
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"tags": "c, bitwise, embedded",
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reference-request, graph-theory, graph-algorithms, application-of-theory, cc.complexity-theory
However, I am not aware of any application of graph modular decomposition in proofs of lower bounds, and I doubt its applicability on the negative side (only a personal biased view).
A final remark. As far as I know, most... | {
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"tags": "reference-request, graph-theory, graph-algorithms, application-of-theory, cc.compl... |
java, beginner, object-oriented, hangman
public boolean isEntireWordGuessed() {
for (boolean b : chars_guessed) {
if (!b)
return false;
}
return true;
}
public void charGuess(char guess) {
int index = word.indexOf(guess);
while (index >= 0)... | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "java, beginner, object-oriented, hangman",
"url": null
} |
homework-and-exercises, quantum-field-theory, fourier-transform
Title: Confusion for Part of Bogolyubov Transform Consider the operator (written in terms of a mode expansion) given by
$$\hat P(u) = \int_0^\infty \frac{d\Omega}{\sqrt{2\pi}}\frac{1}{\sqrt{2\Omega}}\left(\hat b_\Omega e^{-i\Omega u} + \hat b_\Omega^\dagg... | {
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"openwebmath_score": null,
"tags": "homework-and-exercises, quantum-field-theory, fourier-transform",
"url": null
} |
c#, generics, hash-map, enum, extension-methods
public class Log : Dictionary<SoftString, object> {}
Since it's using SoftString (like string but case-insensitive and trimmed) for the key and there are also two different types of data there, I was using a workaround by adding weird suffixes to the actual names to be ... | {
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"tags": "c#, generics, hash-map, enum, extension-methods",
"url": null
} |
The following diagram shows how these conditions are related.
Diagram 1
$\displaystyle \begin{array}{ccccc} 1 &\text{ } & \Longrightarrow & \text{ } & 5 \\ \text{ } & \text{ } & \text{ } & \text{ } & \text{ } \\ \Downarrow & \text{ } & \text{ } & \text{ } & \Updownarrow \\ \text{ } & \text{ } & \text{ } & \text{ } & \... | {
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"lm_label": "1. YES\n2. YES\n\n",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9904406000885707,
"lm_q1q2_score": 0.8317066168422892,
"lm_q2_score": 0.8397339696776499,
"openwebmath_perplexity": 638.3159881490476,
"openwebmath_score": 1.000008463859558,
"tags... |
c#, winforms, mvp, rubberduck
private async Task<IEnumerable<TreeNode>> CreateModuleNodesAsync(VBProject project)
{
var result = new List<TreeNode>();
var parseResult = _parser.Parse(project);
foreach (var componentParseResult in parseResult.ComponentParseResults)
... | {
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"openwebmath_score": null,
"tags": "c#, winforms, mvp, rubberduck",
"url": null
} |
python, performance, algorithm, programming-challenge, combinatorics
## STRING OR LIST (ABOVE) SEEMS TO BE THE SAME EFFICIENCY FOR THIS EXAMPLE
# res = ""
# for x, action in zip(source, comb + (0,)):
# res += x
# if action == 0:
# yield res
# res ... | {
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"openwebmath_score": null,
"tags": "python, performance, algorithm, programming-challenge, combinatorics",
"url":... |
electromagnetism, doppler-effect, gravitational-redshift
Title: What are the characteristics of light entering a disk spinning at near $c$? If I were to spin a translucent disk so that the edge is spinning at .9c and shoot a laser beam at it perpendicular to the edge, what would happen to the light as it travels in on... | {
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "electromagnetism, doppler-effect, gravitational-redshift",
"url": null
} |
homework-and-exercises, newtonian-mechanics, momentum, energy-conservation, conservation-laws
Here I need to find the maximum angle $\overline{\theta}$ reached by the pendulum. Of course, $\omega(\overline{\theta}) = 0$, and hence:
$$E(\overline{\theta}) = Mg\frac{L}{2}(1 - \cos(\overline\theta)) = \frac{1}{2}I\omega... | {
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"tags": "homework-and-exercises, newtonian-mechanics, momentum, energy-conservation, conser... |
winforms, powershell, active-directory
function DNProp($propname, $val, $add, $expand) {
if ($val -is [__ComObject]) {
try {
$valstr = [string]::Format("BinaryValue = {0}`nDNString = {1}",
$(new-object Guid -a (,[byte[]]$(GetProp $val 'BinaryValue'))),
$(GetProp ... | {
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "winforms, powershell, active-directory",
"url": null
} |
haskell, xml
type Coordinate = (String, String, String)
main = do
(filename:_) <- getArgs
(coordinate, parentCoordinate):_ <- runX (readFileDoc filename >>> coordinatesFilter)
print coordinate
print parentCoordinate
readFileDoc = readDocument [withValidate no]
coordinatesFilter :: ArrowXml a => a XmlTree (M... | {
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "haskell, xml",
"url": null
} |
lambda-calculus, term-rewriting-systems, normalization, continuations
J. G. Riecke, H. Thielecke, Typed Exceptions and Continuations Cannot Macro-Express Each Other (Postscript file).
R. Harper, B. F. Duba, D. MacQueen, Typing First-Class Continuations in ML.
H. Thielecke, Continuations, functions and jumps. | {
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"tags": "lambda-calculus, term-rewriting-systems, normalization, continuations",
"url": n... |
c++, tree, extension-methods, boost
// Check if current holder is empty (required by
// 'boost::property_tree' specification).
bool empty() const { return holder_.empty(); }
public:
// Custom serialization implementation.
template <typename Archive> void serialize(Archive& ar, const unsigned int) {
... | {
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"tags": "c++, tree, extension-methods, boost",
"url": null
} |
ofdm, digital-to-analog
I am looking for details after CP addition. Am I missing a step between "CP addition" and "Digital to analog conversion"?
How is the "Digital to analog conversion" done for OFDM?
How do we get the final time domain signal where I can see the multiple tones with different frequency component? Ho... | {
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"tags": "ofdm, digital-to-analog",
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} |
This suggests that in many repetitions of the simulation the estimate of the expected value should be roughly $$0.005008 \pm 2.32 * 0.000022 = 0.005008 \pm 0.000052$$ with $$99 \%$$ confidence.
I ran the simulation myself and obtained estimates consistently close to $$0.005$$ using different random number seeds with o... | {
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"lm_q1_score": 0.9637799410139921,
"lm_q1q2_score": 0.8285266804909075,
"lm_q2_score": 0.8596637523076225,
"openwebmath_perplexity": 317.2236244795162,
"openwebmath_score": 0.9025070667266846,
"tag... |
c#, error-handling, memory-management
Title: Custom list to avoid out of memory exceptions The following class is a helper to avoid OutOfMemoryException exceptions being thrown when the list is to large so that it is added onto the large objects heap. To do this it adds the items onto the heap as smaller arrays contai... | {
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I'm not quite sure if I actually achieve a contradiction here. Can you help me clarify this?
• Is your $p$ prime? Dec 11, 2013 at 6:30
This idea seems fine, although notice that $p$ does not have to be your number itself, but can be one of its divisors.
$16p_1^4p_2^4\ldots p_r^4+1$ must have some prime divisor $p$, ... | {
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"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9857180667042227,
"lm_q1q2_score": 0.8104466737612722,
"lm_q2_score": 0.8221891239865619,
"openwebmath_perplexity": 106.77300271320055,
"openwebmath_score": 0.9349973201751709,
"ta... |
javascript, asynchronous
Usage
const tasks = [
cb => {
setTimeout(() => {
cb('done 1');
}, 1000);
},
cb => {
setTimeout(() => {
cb('done 2');
}, 1000);
},
cb => {
setTimeout(() => {
cb('done 3');
}, 1000);
}
];... | {
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"openwebmath_score": null,
"tags": "javascript, asynchronous",
"url": null
} |
java, object-oriented, unit-testing, api, ddd
Every type used above belongs to third party code. I also need to know the good strategy to handle exceptions?
Update 1
One frequent issue I encounter and I am sure many if us will is that there is usually references to the third party type LineItem is sprinkled everywhere... | {
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} |
inorganic-chemistry, acid-base
If you are curious, here is the R code I used to estimate the equilibrium constant of sodium oxide hydration, using the package CHNOSZ:
> subcrt(c("Na2O","H2O","NaOH"),c(-1,-1,2),T=25)
info.character: found H2O(liq), also available in gas
subcrt: 3 species at 298.15 K and 1 bar (wet)
$r... | {
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} |
performance, haskell, comparative-review
In my opinion, the interface specified in the challenge is weird: the function would be better named insertBefore, since I expect that inserting an element at position 0 would place it at the head of the resulting list.
As a rule of thumb, Haskell functions should be designed s... | {
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2. Measuring the lengths of a set of nearly identical pencils. Through repeated measurements of these objects (one measurement per pencils, repeated for many pencil) one can collect a set of measurements for the length of this type of pencil. From this, one can determine the average length of this type of pencil (L). A... | {
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fft, ifft
The input vector x is passed through a function DSPF_sp_cfftr2_dit(), which is described as a radix-2 decimation-in-time forward FFT. It expects its input in normal order and writes its output in bit-reversed order. It expects its twiddle factors to be in bit-reversed order (which they are, as shown in the f... | {
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fft, autocorrelation, pitch
so, mathematically, thinking in the continuous domain, you're getting
$$r(t)=\mathcal F^{-1}\Big\{\mathcal F\{s(t)\}(f)*\mathcal F\{s(t)\}(-f)\Big\}(t)$$
with $s(t)$ being the signal, and $*$ is the convolution, and $r$ being your autocorrelation inverse transform.
Now, $\mathcal F\{s(t)\}(... | {
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signal-analysis, digital-communications, ofdm
It can be derived analitically with aid of PDF of normal distribution. Look, we need to estimate how much peak value exceeds $\sigma$ to estimate crest factor. If for example $1e+6$ samples are used the probability of peak value is $1e-6$. It is rought approximation. For n... | {
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"tags": "signal-analysis, digital-communications, ofdm",
"url": null
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navigation, base-global-planner, costmap, map-server, move-base
Original comments
Comment by sobot on 2015-05-03:
Hi, i have a similar question/problem but for the opposite occupancy, i want to extract the FREE cell coordinates of my map and the use them for navigation. do you happen to have a code snip for the free c... | {
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"tags": "navigation, base-global-planner, costmap, map-server, move-base",
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} |
slam, navigation, rtabmap
<param name="Rtabmap/TimeThr" type="string" value="700"/>
<param name="Mem/RehearsalSimilarity" type="string" value="0.45"/>
<param name="Icp/CorrespondenceRatio" type="string" value="0.5"/>
<param name="Vis/MaxFeatures" type="string" valu... | {
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"tags": "slam, navigation, rtabmap",
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python, game
def __str__(self):
return f"\nPlayers in game : {str(self.players)} \nActive players: {str(self.playersActiveGame)} \nPot size: {str(self.chipsInPlay)} \nCash on hand: {str(self.playersCash)} "
def testNoob():
player0 = player("player0",125)
player1 = player("player1",125)
player2 = ... | {
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quantum-mechanics, operators, mathematical-physics, group-theory, lie-algebra
We are now specifically interested in situations where $G$ is a Lie group. And here we must distinguish two possibilities:
We have $G\simeq \widetilde G/Z$, where $G$ and $\widetilde G$ are both Lie groups, but $Z$ is a discrete subgroup of... | {
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"tags": "quantum-mechanics, operators, mathematical-physics, group-theory, lie-algebra",
... |
symmetry, supersymmetry, spinors, gauge-invariance, supergravity
for arbitrary real parameters $\alpha,$ and $\beta.$ They say you do that so that $1$ and $e^1$ are left unchanged, but someone how this affects the coefficient on $e^1$?? I'd check for a peer reviewed version. They said they were going to show how to us... | {
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genetics, human-genetics, population-genetics, twins
Title: Why was the study of "Concordance of Monozygotic and Dizygotic twins for traits" designed in this way? I am confused by the twin study 'Concordance of Monozygotic and Dizygotic twins for traits.' My questions arose from 3:17-4:17 of the video
And this is the... | {
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"tags": "genetics, human-genetics, population-genetics, twins",
"url": null
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ros-melodic, ros-lunar, ros-kinetic, docker, roscore
Comment by Mike Scheutzow on 2023-03-25:
@danambrosio That was a difficult one! Well done.
Update #3 in the original post is a bandaid solution for the delays in roscore and roslaunch.
Update #4 highlights the underlying issue with nofile ulimits within a docker co... | {
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physical-chemistry, gas-laws, phase, kinetic-theory-of-gases
Especially the second is well-known to all those who have a butane lighter of transparent material. If it is half-full, a clear distinction between the liquid and gaseous phases can be seen inside at room temperature. Naturally, the inside of the lighter mus... | {
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c#
using (var connection = new SqlConnection(connectionString))
{
connection.Open();
var command = connection.CreateCommand();
command.CommandText = sql;
using (var reader = command.ExecuteReader())
{
return GetDebentursFromReader(re... | {
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ros, python, catkin, unit-testing
Originally posted by William with karma: 17335 on 2013-03-12
This answer was ACCEPTED on the original site
Post score: 3
Original comments
Comment by joq on 2013-03-13:
Thanks for the pointer William. I opened a bug ticket on the missing docs: https://github.com/ros/catkin/issues/384... | {
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urdf, ros-melodic, transform
Title: Having an artificial robot in the scene
I'm trying to use a node which requires the full pose of the camera I am using, as well as the TF between the camera and the robot. Since I don't have an actual robot here, I'd like to create an artificial one in the urdf and pretend that it ... | {
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"tags": "urdf, ros-melodic, transform",
"url": null
} |
javascript, jquery, beginner
createAjaxRequest("Manager/GetTopAttachmentTypes", null).done(function (res) {
for (var i = 0; i < res.length; i++) {
file_types_lookup[res[i].TypeId] = res[i];
}
});
}
}
function fillAttachmentsPerPage(pageNum) {
createAjaxRequest... | {
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u2X0I1 91w AK9uGtba t S3o Sf 8tcw Sahr heX PLlL4CP. This prealgebra lesson explains how to convert a decimal to a fraction. 123 For example, the fraction 3/4 can be converted to a decimal by dividing its numerator (3) by its denominator (4), which results in 0. Convert a ratio to a decimal. 5 8. 7 15 = 0. 75 to a binar... | {
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"openwebmath_score": 0.6260017156600952,
"ta... |
harmonic-oscillator, oscillators
$$
\ddot z-\omega^2z={f_0\over 2}e^{-i(\omega+\delta)t},
$$
and the corresponding equation with $\omega-\delta$? If so, then you're most of the way there. When you have an inhomogeneous linear differential equation with multiple terms on the right side (which is what you've got), you c... | {
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7. Originally Posted by harish21
Yes.
Then the integration becomes:
$\int_0^1 x^{29} e^{u} \frac{-du}{30x^{29}} = \frac{-1}{30}\int_0^1 e^u du$
now integrate, and then substitute the value of u, then solve for the given upper and lower limits
It is better to confirm that the OP has the correct expression for dx and ... | {
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solar-system, light, solar-wind, antimatter, gamma-rays
Cosmic gamma rays were first detected in the early 1970s, when the distinctive 511 keV radiation signature of electron-positron annihilation was detected coming from the centre of our galaxy. Since then, there have been numerous surveys of cosmic gamma ray source... | {
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most academic fields. {image} {image} {image} {image} 3. Now We have two components R and L connected in Series and a voltage source to those components as shown below. For the differential equation show below:y(1) = 1y'(1) = 0a) Write down a general expansion for a power series solution y(x) about the point Xo = 1b)Fi... | {
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c++, performance, integer, number-systems
t_1 = t / 10;
t_2 = t % 10;
inc_val = 0;
buffer[n++] = (char)('0' + t_2);
if(n == sizeof(buffer)){string_input.append(buffer, n); n = 0;}
}
if(t_1 >= 1) buffer[n++] = (char)('0' + t_1);
if(n) string_input.append(buffer, n);
s... | {
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"tags": "c++, performance, integer, number-systems",
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c#, asp.net-mvc, razor, asp.net-mvc-2
This code works, but as I am learning MVC, and I would like to have suggestions. What areas in this code could have been done better, or what is best practice in regards with this kind of model population and posting? Could I use a @Html.CheckBoxFor() helper or this is ok? In my ... | {
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physical-chemistry
the kinetic energy of the water molecules matches that of the surrounding air. Pressure moves from high to low, and as the water boils, certain molecules acquire the necessary speed (and therefore pressure) to enter the gaseous state. Keep in mind that heating the pot negligibly changed the kitchen ... | {
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so that we could just proceed by a simple hypothetical syllogism and get our result. This is what we will try to do in the following steps (we now continue the proof):
1. $(\neg A \rightarrow (B \rightarrow \neg\neg B)) \rightarrow ((\neg A \rightarrow B) \rightarrow (\neg A \rightarrow \neg \neg B))$, Ax2
2. $(B \rig... | {
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c#, observer-pattern
/// <summary>
/// Creates a new instance of type <typeparamref name="T"/> that is observed by the controller
/// </summary>
/// <typeparam name="T">Type of the object to create</typeparam>
/// <returns></returns>
public T Create<T>() where T : MarshalByRefObject, new()
{
... | {
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Spring 框架是一个开源的 Java 平台，它为容易而快速的开发出耐用的 Java 应用程序提供了全面的基础设施。Spring 框架最初是由 Rod Johnson 编写的，并且 2003 年 6 月首次在 Apache 2. The resulting motion can become relatively complicated. Consider three springs in parallel, with two of the springs having spring constant k and attached to two walls on either end, and the third spring o... | {
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"openwebmath_score": 0.3487705886363983,
... |
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