text stringlengths 1 1.11k | source dict |
|---|---|
python, gui, tkinter
def main():
helper = TortoiseHelper()
helper.mainloop()
if (__name__ == '__main__'):
main() The code could be redesigned to make porting to Python 3.X easier in the future. A lot of refactoring is needed, and the following is only a partial redesign. The biggest problem that the progr... | {
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"tags": "python, gui, tkinter",
"url": null
} |
Most classical sources (Evans, Gilbarg+Trudinger, and Aubin) either only consider Dirichlet conditions (in which case the analogous estimate is essentially just the maximum principle) or only provide Schauder estimates for the Neumann problem -- this is not quite what I want.
Does anyone know of a resource for this ki... | {
"domain": "mathoverflow.net",
"id": null,
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"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9808759598948639,
"lm_q1q2_score": 0.813086147233808,
"lm_q2_score": 0.828938806208442,
"openwebmath_perplexity": 85.60581530979087,
"openwebmath_score": 0.9756945967674255,
"tags":... |
• Base rates in the Williams case. Let $$H$$ be the hypothesis that "Williams committed the murders," and let $$E$$ be the evidence, "Carpet fibers on the victim matched those in Williams' house." Suppose we accept the prosecutions data for the Williams case:
• $$\Pr(E|\neg H) = 1/8000 = 0.0001$$
• $$\Pr(E| H) = 1$$
Us... | {
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"lm_q1q2_score": 0.817424287389797,
"lm_q2_score": 0.8354835432479661,
"openwebmath_perplexity": 1153.7457221897257,
"openwebmath_score": 0.7954885959625244,
"tags": null,
... |
reaction-mechanism, equilibrium, atoms, atmospheric-chemistry, ozone
In our estimates, termination of the Cl--ClO chain results from a downward diffusion of the longer lived species in the chain (HCl, ClO) and eventual removal by tropospheric process. From: Nature 249, 810-812 (28 June 1974).
There are also a number ... | {
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"tags": "reaction-mechanism, equilibrium, atoms, atmospheric-chemistry, ozone",
"url": n... |
javascript, jquery, beginner, css, plugin
var options = $.extend(defaults, options);
return this.each(function () {
var i = $(this);
var o = options;
var width = $('nav.sidebar').css('width');
var height = $('footer.hidden').css('height');
var closeColor = $('.bar').css('b... | {
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"openwebmath_score": null,
"tags": "javascript, jquery, beginner, css, plugin",
"url": null
} |
group-theory, representation-theory, quantum-chromodynamics, lie-algebra
They're the basis of all 3x3 Hermitian traceless matrices. Two of them, the 3rd and 8th, are taken to be diagonal. The remaining 6 are off-diagonal matrices that only have $+1,+1$; or $+i,-i$ at the $ij$- and $ji$-location of the matrix. The orde... | {
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"tags": "group-theory, representation-theory, quantum-chromodynamics, lie-algebra",
"url"... |
electrostatics, capacitance, electronics
$$C=\frac{Q}{V}$$
$$V=\int_{0}^{d}E(z)dz$$
It then continues to assume that the electric field lines are straight between the plates (although that's a reasonable assumption), and integrates over the distance between the two plates. It then defines $E$ as being $\frac{\sigma}{\... | {
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"tags": "electrostatics, capacitance, electronics",
"url": null
} |
is a powerful statistical analysis program that performs linear and nonlinear regression analysis, surface and curve fitting. Then it will attempt to solve the equation by using one or more of the following: addition, subtraction, division, taking the square root of each side, factoring, and completing the square. " if... | {
"domain": "valoreterritorio.it",
"id": null,
"lm_label": "1. YES\n2. YES\n\n",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9759464485047916,
"lm_q1q2_score": 0.8174722323678324,
"lm_q2_score": 0.8376199673867852,
"openwebmath_perplexity": 808.1264268448064,
"openwebmath_score": 0.39217397570610046,... |
thermodynamics, statistical-mechanics, adiabatic
\frac{\partial^2 E}{\partial X_0^2}\frac{\partial^2 E}{\partial X_1^2} - \left(\frac{\partial^2 E}{\partial X_0 \partial X_1}\right)^2\ge0, etc. \tag{4}\label{4}$$
Substitute $S=X_0;V=X_1;N=X_2,etc.,$ for $\delta^2 E =\delta T \delta S -\delta p \delta V +\delta \mu \de... | {
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"tags": "thermodynamics, statistical-mechanics, adiabatic",
"url": null
} |
python, beginner, python-3.x, file-system
if __name__ == '__main__':
main()
vs
if __name__ == '__main__':
if len(sys.argv) == 4:
is_dry_run_argument = sys.argv[3]
if not is_dry_run_argument == "--dryrun":
print("The 3rd argument must be '--dryrun' or nothing.")
else:
... | {
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"tags": "python, beginner, python-3.x, file-system",
"url": null
} |
python, classes, selenium
I tried putting driver.get(CNKI.URL) in MainPage's __init__ function (it has since been commented out) but the code did not run well. I got caught in a "Catch-22"-like situation whereby initiation of both MainPage and SearchResult require driver as an argument. Which means I cannot do: | {
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"tags": "python, classes, selenium",
"url": null
} |
electromagnetism
Why does the magnetic field (blue in figure) at $r$ only depend on the magnetic field caused by the enclosed current $I_{enc}$ (the pink dots) ?
Why isn't there an influence by the magnetic field caused by the remainder of the current [$ I-I_{enc}$] (red dots)? For example, from $r \angle 40$ radiall... | {
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"openwebmath_score": null,
"tags": "electromagnetism",
"url": null
} |
sequence-alignment, proteins, python, sequence
There was an issue with some entries having Chain or Chains so both had to be considered. Additionally, there are commas that can be removed from all but the last chain ID but for my purposes I do not need to strip it, you can put something in _fasta_helper() to this end ... | {
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"openwebmath_score": null,
"tags": "sequence-alignment, proteins, python, sequence",
"url": null
} |
python, python-3.x, reflection, meta-programming, type-safety
Title: Strict types decorator (works only with Python 3.5) I wrote a decorator which makes Python 3.5 raise exceptions if the arguments that are passed to a type-hinted function are of the wrong type.
from typing import get_type_hints
def strict_types(f):
... | {
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"tags": "python, python-3.x, reflection, meta-programming, type-safety",
"url": null
} |
quantum-field-theory, vacuum, higgs
Red dashed lines denote scales at which self-coupling become negative. How can sense be made of the whole construction?
We need a stable vacuum for consistency. How can we start with a consistent model at lower scales and arrive at an inconsistent model at higher scales? Does it me... | {
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"tags": "quantum-field-theory, vacuum, higgs",
"url": null
} |
So, instead of partitioning the image using ImagePartition, you can get a list of all the boxes of a given size by
PartitionBoxes[{rows_, cols_}, size_] :=
Transpose /@ Tuples[{Partition[Range[1, rows, size], 2, 1],
Partition[Range[1, cols, size], 2, 1]}];
If you apply PixelCount to above, as in your algorithm, you ... | {
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"lm_q1q2_score": 0.8796865606274719,
"lm_q2_score": 0.8991213664574069,
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"openwebmath_score": 0.49823832511901855,
"ta... |
\tag{8} \\[4pt] &\qquad\quad\text{(because \sin^2x+\cos^2x=1)} \\[4pt] &=\frac{1}{12}\left(\cos^2x-\sin^2x\right)^2 \tag{9} \\[4pt] &=\frac{1}{12}\cos^2(2x) \tag{10}\\[4pt] &\qquad\quad\text{(because \cos^2x-\sin^2x=\cos2x)} \end{align} | {
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"lm_q1_score": 0.9715639653084244,
"lm_q1q2_score": 0.8370394790195368,
"lm_q2_score": 0.8615382094310357,
"openwebmath_perplexity": 1466.9264245132713,
"openwebmath_score": 0.9782208800315857,
"ta... |
c#, beginner, game, xamarin, battleship
for (int i = 1; i < ship.Length(); ++i)
{
switch (ship.Orientation)
{
case Orientation.South:
Grid.Squares[x][y - i].Type = SquareT... | {
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"tags": "c#, beginner, game, xamarin, battleship",
"url": null
} |
aqueous-solution, kinetics
The only dimensionless variable that arises from this set of quantities is $\eta := z/\sqrt{Dt}$, so we know $\phi(z,t) = \phi(\eta)$. Substituting this result into our diffusion equation and applying the chain rule yields the ordinary differential equation $$-\frac{\eta}{2}\phi'(\eta) = \ph... | {
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"tags": "aqueous-solution, kinetics",
"url": null
} |
moment of inertia is just a measure of how hard it is to get something rotating. I need to calculate the change in moment of intertia due to modifing a simple angled beam from 120 x 120 x 10 to 120 x 112 x 10. The moment of inertia is to be found about the center of the rod. where , are the coordinates of a point on th... | {
"domain": "everwoodbiocostruzioni.it",
"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.985271388745168,
"lm_q1q2_score": 0.8432456481315765,
"lm_q2_score": 0.8558511469672594,
"openwebmath_perplexity": 466.01335969356194,
"openwebmath_score": 0.6785146594047546... |
mass-energy
Releasing this chemical energy will lower the masses slightly; but the mass-energy equivalence makes it so that this mass change is quite small compared to the mass of the combustibles (because in the end of these reactions you still have molecules which still have mass, so you will not be extracting all t... | {
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"tags": "mass-energy",
"url": null
} |
bash, linux
Case-insensitive case
Use the nocasematch option:
If the nocasematch shell option (see the description of shopt in
The Shopt Builtin) is enabled, the match is performed without regard
to the case of alphabetic characters.
So:
shopt -s nocasematch
case $yes_no in
y|yes) ...
;;
n|no|qui... | {
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"tags": "bash, linux",
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} |
Engineering Caprani Important Maths Topics Essential Maths are... Energy Transfer by Appliances ⢠Describe how different domestic Appliances Transfer Energy canât. Of learning by example be drawn to Electrical Engineering Formulas and equations are listed here ) Horsepower hp... Fire hazards Electrical current it c... | {
"domain": "grecotel.com",
"id": null,
"lm_label": "1. Yes\n2. Yes\n\n",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9585377320263432,
"lm_q1q2_score": 0.8128090845814071,
"lm_q2_score": 0.8479677506936878,
"openwebmath_perplexity": 1980.2699634755063,
"openwebmath_score": 0.3141802251338959,
"tag... |
reinforcement-learning, deep-rl, pytorch, actor-critic-methods, notation
Title: What does the notation $\partial \theta_{\pi}$ mean in this actor-critic update rule? One of the steps in the actor-critic algorithm is $$\partial \theta_{\pi} \gets \partial \theta_{\pi} + \nabla_{\theta}\log\pi_{\theta} (a_i | s_i) (R - ... | {
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"openwebmath_score": null,
"tags": "reinforcement-learning, deep-rl, pytorch, actor-critic-methods, notation",
"url": null... |
homework-and-exercises, kinematics
Title: Is this question worded correctly? I'm trying to solve some questions in dynamics and I came across this problem. I've attempted to solve it first without looking at the answer but after several attempts, I've failed. I've looked at the answer and I found out two cases:
the q... | {
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"tags": "homework-and-exercises, kinematics",
"url": null
} |
ros, physics
I would say yes.
At its core, ROS is 'just' a middleware (ie: a way for programs to exchange data, whether locally, on the same machine, or via a network) that happens to come with a lot of components and a (relatively) large community. If you like the idea of creating robot (control) systems that consist... | {
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"tags": "ros, physics",
"url": null
} |
particle-physics, quantum-spin, group-theory, representation-theory, spin-statistics
Title: Spin of Fundamental Particles Is there any explanation/theorem which justifies that most fundamental particles have spin half or spin one?
Apriori, studying representations of symmetry groups and their connection with spin of f... | {
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"tags": "particle-physics, quantum-spin, group-theory, representation-theory, spin-statisti... |
complexity-theory, time-complexity, towers-of-hanoi
Title: Complexity of Towers of Hanoi I ran into the following doubts on the complexity of Towers of Hanoi, on which I would like your comments.
Is it in NP?
Attempted answer: Suppose Peggy (prover) solves the problem & submits it to Victor (verifier). Victor can e... | {
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"tags": "complexity-theory, time-complexity, towers-of-hanoi",
"url": null
} |
sql, sql-server
CONSTRAINT [IXuCode1] UNIQUE CLUSTERED
(
[CacheTableID] ASC,
[CodeID] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
) ON [PRIMARY] | {
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"tags": "sql, sql-server",
"url": null
} |
ros, roslibjs
Title: How to publish Image and IMU data from Android device?
Hi,
First of all, i'm a newbie in ROS. I was going through the following tutorial:
http://wiki.ros.org/roslibjs/Tutorials/Publishing%20video%20and%20IMU%20data%20with%20roslibjs
I kind of understood what is going on in this program. But, i do... | {
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"tags": "ros, roslibjs",
"url": null
} |
algorithm, c, library, priority-queue
#ifndef DATA_H_
#define DATA_H_
struct element {
int weight;
char* data;
};
#endif // DATA_H_
The priority queue header file:
/*
Heap ordered priority queue storing in a resizable array
*/
#ifndef PRIORITY_QUEUE_
#define PRIORITY_QUEUE_
#include "data.h"
struct prior... | {
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ros
<inertial>
<mass value="2.5"/>
<inertia ixx="1.0" ixy="0.0" ixz="0.0" iyy="1.0" iyz="0.0" izz="1.0"/>
<origin/>
</inertial>
</link>
<joint name="left_upper_to_lower_bicep" type="revolute">
<parent link="left_upper_bicep_link"/>
<child link="left_lower_bicep_link"/>
<origin xyz... | {
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"openwebmath_score": null,
"tags": "ros",
"url": null
} |
geochemistry, volcanology
Title: Why do Volcanoes give out so much Sulphur Dioxide and Carbon Dioxide? From my understanding, the mantle is in a highly reduced state, so I can't understand why a volcano would give off a highly oxidised gas such as sulphur dioxide.
Carbon dioxide is too an oxidised gas which is emitted... | {
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"openwebmath_score": null,
"tags": "geochemistry, volcanology",
"url": null
} |
mathematical-models
Title: Value of mathematical models in biology Sorry if this is too much of a soft question or if it is too broad for this site.
As a person who has much more experience with math than biology, I've always been really interested in the mathematical side of biology. As I study math in biology, howev... | {
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"tags": "mathematical-models",
"url": null
} |
java, performance, memory-optimization
There’s probably something wrong with getDistance() - it should either be an instance method or you shouldn’t need to pass in this.
You don’t need to loop twice. Every time you find an object with a matching id, compare it’s distance to the current nearest object. Only keep the n... | {
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"tags": "java, performance, memory-optimization",
"url": null
} |
java, music
public static Names get(Integer value) {
return lookup.get(value);
}
}
private int pitch;
private float length;
public int getPitch() {
return pitch;
}
public void setPitch(int pitch) {
this.pitch = pitch;
}
public float getLength(... | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "java, music",
"url": null
} |
audio, modulation, demodulation, hilbert-transform, psychoacoustics
Can this really be the case? I didn't notice any error in the timing of different frequencies.
I think the Quora answer might be erroneous, because Hilbert transform adds delay to the individual sine/cosine wave components of the original signal, with... | {
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"tags": "audio, modulation, demodulation, hilbert-transform, psychoacoustics",
"url": null
} |
python
Extra details...
The class is from a contracts module that has 3 classes. Contract, ContractLine, ContractCustomer. Contracts can be of two types ('item','vendor') and a contract can also be a group contract. Group contracts are one contract shared amount many customers. A "normal" or non group contract would o... | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "python",
"url": null
} |
electromagnetism, electrostatics, electric-fields, conductors
What would happen in reality? If you suddenly removed all the electrons from a piece of material, or even just the valence electrons, you would be left with a huge concentration of positive ions in a small volume, which would exert a huge electrostatic repu... | {
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"openwebmath_score": null,
"tags": "electromagnetism, electrostatics, electric-fields, conductors",
"url": null
} |
hydrogen
Title: What is Nascent Hydrogen? I am currently studying preparation of Alkane from Alkyl Halides (By Reduction)
But the term "Nascent Hydrogen" Confuses me after reading diffrent threads and stuff
Please help :) Some dyes are reduced by a mixture of $\ce{Zn + HCl}$, and are not reduced by zinc alone or by $... | {
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"tags": "hydrogen",
"url": null
} |
c++, iterator
return result;
}
private:
struct FirstFilenameInfo
{
std::string prefix;
std::uint32_t first_frame_number;
std::size_t digit_padding;
std::string extension;
};
static FirstFilenameInfo get_first_filename_info(std::string const& first_frame_filename)
... | {
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"tags": "c++, iterator",
"url": null
} |
c#, .net-core
Source Code
The project is available on github.
Program.cs
using BasicCodingConsole.Views.MainView;
using BasicCodingConsole.Views.SettingView;
using BasicCodingLibrary.Models;
using BasicCodingLibrary.ViewModels;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
u... | {
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"openwebmath_score": null,
"tags": "c#, .net-core",
"url": null
} |
image-processing, matlab, image-restoration
Title: How to produce self-adjoint filters using Gaussian and motion blur in Matlab? I am trying to write a Matlab code to produce motion and Gaussian blur. Here is my code:
f0=imread('cameraman.png');
[Nx,Ny,Nz]=size(f0);
if Nz>1;f0=double(rgb2gray(f0));
else
f0=doub... | {
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"tags": "image-processing, matlab, image-restoration",
"url": null
} |
acid-base, electrochemistry, experimental-chemistry, solutions, home-experiment
As an aside: Now after a little more reading, I'm wondering if maybe my oxalic acid solution contains ferrioxalate ions too (or instead), although that's specific to my oxalic acid experiments rather than acids in general. They're also bri... | {
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"tags": "acid-base, electrochemistry, experimental-chemistry, solutions, home-experiment"... |
genetics, sex
Apparently, "facial hair" isn't an acceptable answer... Yes, having a Y chromosome does cause specific alterations to facial structure.
The Y chromosome doesn't contain much actual genetic information. Most of the information needed to activate the male developmental program (the female one is the defaul... | {
"domain": "biology.stackexchange",
"id": 5515,
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"lm_q2_score": null,
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"openwebmath_score": null,
"tags": "genetics, sex",
"url": null
} |
general-relativity, stress-energy-momentum-tensor, binding-energy
If you start worrying about binging energies you risk walking the path to madness. The majority of an atom's mass is in the nucleus, and 99% of the mass of a nucleon is the QCD binding energy. So if you start worrying about how to describe the electrost... | {
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"tags": "general-relativity, stress-energy-momentum-tensor, binding-energy",
"url": null
... |
radiation, topology, topological-field-theory, duality, cosmic-string
$$
\tag 3 \psi^{2}\partial_{\mu}\theta = \frac{1}{2}f_{a}\epsilon_{\mu \nu \alpha \beta}\partial^{\nu}B^{\lambda \rho}
$$
one provides analytical description of radiation of $\theta $ bosons by string-like solutions $(2)$.
The question: I complete... | {
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"tags": "radiation, topology, topological-field-theory, duality, cosmic-string",
"url": n... |
# Sums of squares in characteristic 3
Suppose $K=\mathbb{F}_q$ is a finite field of characteristic 3. Suppose $q > 3$, then is it true that for all $x \in K$ there exists $a,b,c \in K^{\times}$ such that $x = a^2 + b^2 + c^2$ i.e, is every element the sum of 3 non-zero squares?
My [wrong] idea is: fix $x \in K$. Note... | {
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"lm_q2_score": 0.8438951084436077,
"openwebmath_perplexity": 55.663117481357624,
"openwebmath_score": 0.978265106678009,
"tag... |
fluid-dynamics, acoustics, oscillators, flow, resonance
The way woodwind instruments produce sound, is they cause a column of air within the instrument to vibrate. This is done by splitting the air stream. Instruments such as the sax or clarinet use a reed to do this. A concert flute or a wine bottle blows air across ... | {
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"openwebmath_score": null,
"tags": "fluid-dynamics, acoustics, oscillators, flow, resonance",
"url": null
} |
gravity, jupiter, tidal-forces, asteroid-belt
Title: Will a new planet form if Jupiter's influence on asteroid belt will diminish in a few billion years? I know that tidal forces are pushing Jupiter farther from the Sun, but I couldn't find exactly the yearly amount. In a few billion years would this effect (and subse... | {
"domain": "astronomy.stackexchange",
"id": 356,
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "gravity, jupiter, tidal-forces, asteroid-belt",
"url": null
} |
homework-and-exercises, electric-circuits, electrical-resistance, capacitance
Title: Deriving ODE for voltage across capacitor-RC circuit I need to derive an ODE for the voltage across the capacitor in a specific RC circuit. The circuit has 1 resistor, one input, one capacitor and a switch.
So far I have
$$\frac{dv}{... | {
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"tags": "homework-and-exercises, electric-circuits, electrical-resistance, capacitance",
... |
Note. For abelian groups with additive notation, right and left cosets are instead denoted by $H+x$ and $x+H$, respectively.
So basically a coset is a set obtained by taking the elements of a subgroup and adding a particular element to all of them. Note that a coset does need not be a subgroup! To get a feeling for wh... | {
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"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.994445076119459,
"lm_q1q2_score": 0.8350693014248322,
"lm_q2_score": 0.8397339596505965,
"openwebmath_perplexity": 90.58441459508255,
"openwebmath_score": 0.9844970107078552,
"tags": null,... |
r
colnames(FINAL_CENTILE_TABLE50)<-c("Decile threshold","Total income in the decile","Number of persons in the centile","Share of the decile in total income (%)","Tax","Share tax(%)")
FINAL_DECILE_TABLE <- rbind(FINAL_DECILE_TABLE, FINAL_CENTILE_TABLE50) | {
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"openwebmath_score": null,
"tags": "r",
"url": null
} |
navigation, mapping, gps
0.0, 0.0, 0.0, 0.0, 0.03, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0,
0.0, 0.0, 0.0, 0.0, 0.00, 0.06, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0,
0.0, 0.0, 0.0, 0.0, 0.00, 0.0, 0.025, 0.0, 0.0, 0.0, 0.0, 0.0,
... | {
"domain": "robotics.stackexchange",
"id": 20148,
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"openwebmath_score": null,
"tags": "navigation, mapping, gps",
"url": null
} |
The function would be written like this:
. . $d(t) \;=\;\begin{Bmatrix}3t & & 0 \leq t \leq 0.75 \\ 2.25 + 5t & & 0.75 \leq t < 2 \\ 8.5 & & 2 \leq t \leq 2.5 \\ 8.5+3t & & 2.5 < t < 4 \end{Bmatrix}$
The graph would look like this:
Code:
|
| *
| * :
| ... | {
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"openwebmath_score": 0.8450347781181335,
"... |
python, performance, python-2.x, mysql
if destination is not None:
query += ' AND deployment.destination = %s'
parameters = (request_id, destination)
conn = MySQLdb.connect(**dbconfig)
cursor = conn.cursor()
cursor.execute(query, parameters)
messages = [
'{}: {}'.format(dt, mes... | {
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"openwebmath_score": null,
"tags": "python, performance, python-2.x, mysql",
"url": null
} |
ros, rosbridge, websocket
Originally posted by arunavanag with karma: 277 on 2018-02-25
This answer was ACCEPTED on the original site
Post score: 0 | {
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"tags": "ros, rosbridge, websocket",
"url": null
} |
c#, socket, dependency-injection, configuration
service.Start();
while(true)
{
Thread.Sleep(1000);
}
}
private static void RegisterNetwork(IServiceCollection services)
{
var settings = new NetworkSettings();
var section = _configuration.GetSection("Proj... | {
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"id": 31246,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "c#, socket, dependency-injection, configuration",
"url": null
} |
organic-chemistry, reaction-mechanism, redox, carbonyl-compounds, organic-reduction
The summery of reduction of carboxylic acids and their esters are illustrated in following scheme, where two different groups (Ref.1 & Ref.3) achieved two different results for ester reduction under different conditions:
References:
... | {
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"tags": "organic-chemistry, reaction-mechanism, redox, carbonyl-compounds, organic-reduct... |
ros, rviz, transform-broadcaster, timer
rectangularTrajectory::~rectangularTrajectory()
{
ROS_INFO("Calling the deconstructor of the class rectangularTrajectory");
}
void rectangularTrajectory::broadcastTF(tf::TransformBroadcaster *tf_broadcaster,
std::string device_frame,
double... | {
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"tags": "ros, rviz, transform-broadcaster, timer",
"url": null
} |
newtonian-gravity, experimental-physics, drag, estimation, error-analysis
The smaller lead balls arrangement and the torsion wire were contained in a Mahogany box to reduce air currents and the whole apparatus was in a room about $3\,\rm m$ cube to guard against temperature variations.
All manipulation of the apparatu... | {
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"tags": "newtonian-gravity, experimental-physics, drag, estimation, error-analysis",
"url... |
javascript, object-oriented, design-patterns, validation, ecmascript-6
Questions:
I need to know if I am following the pattern properly?
Can I do same with less verbose code?
Note:
Maintainability and flexibility is prime here. Keep in mind that there can be more validations. Unfortunately ecmascript-6 does not have... | {
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"tags": "javascript, object-oriented, design-patterns, validation, ecmascript-6",
"url... |
kalman-filter, ekf, pose
Continuous estimation. Each state estimation node in robot_localization begins estimating the vehicle's state as soon as it receives a single measurement. If there is a holiday in the sensor data (i.e., a long period in which no data is received), the filter will continue to estimate the robot... | {
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"id": 510,
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"openwebmath_score": null,
"tags": "kalman-filter, ekf, pose",
"url": null
} |
π is pi and choose the number in box! To as radii a straight line from the center of a semicircle are the same its.. Download version 2.0 now from the Chrome web Store are going to see how to find the perimeter of semicircle... Inscribed in a rectangle '' 2 Determine the area of the circumference of a semicircle includ... | {
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"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9867771782476948,
"lm_q1q2_score": 0.8347566931635715,
"lm_q2_score": 0.845942439250491,
"openwebmath_perplexity": 710.864624394103,
"openwebmath_score": 0.7826593518257141,
"tags"... |
terminology, performance
Title: What does it mean when a computer runs 'faster'? If you have two computers with only one thread, a and b.
And computer a runs twice as fast as computer b.
Does this mean that computer a and can do twice as many operations in a given time in comparison to computer b?
To increase the Her... | {
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "terminology, performance",
"url": null
} |
c#, sql, sql-server
static void Log( String message )
{
using ( Data.SqlClient.SqlConnection sqlconn = GetConn() )
{
using ( Data.SqlClient.SqlCommand cmd = new Data.SqlClient.SqlCommand( "perfect.Log", sqlconn ) )
{
cmd.CommandType = Data.CommandType.StoredProcedure;
Data.SqlClie... | {
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"openwebmath_score": null,
"tags": "c#, sql, sql-server",
"url": null
} |
algorithms, graphs, trees, minimum-spanning-tree
Title: Edge exchange property of two Minimum Spanning Trees Given an undirected graph G with weight on its edges and 2 different minimal spanning trees(MSTs): T, T'
Then I want to prove the following:
For every edge e in T that's not in T', there is an edge e' in T'
th... | {
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"openwebmath_score": null,
"tags": "algorithms, graphs, trees, minimum-spanning-tree",
"url": null
} |
enable JavaScript in your browser improve functionality performance! Exercise strengthens the understanding of how to take the derivative of the standard from! Education for anyone, anywhere rules Intro Khan Academy basic rules Intro Khan Academy est une organisation à non... That the derivative of logarithmic function... | {
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"lm_q2_score": 0.8376199673867852,
"openwebmath_perplexity": 2170.444359404684,
"openwebmath_score": 0.41827788949012... |
c#, api, inheritance, enum
public bool Contains(int flags) => (Flag & flags) == flags;
[DebuggerStepThrough]
public override string ToString() => $"{Category.ToString()}.{Name.ToString()}";
#region IEquatable
public bool Equals(Option other) => AutoEquality<Option>.Comparer.Equals(this, other);
... | {
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"tags": "c#, api, inheritance, enum",
"url": null
} |
thermodynamics, pressure, earth, geophysics
Source: https://en.wikipedia.org/wiki/File:Temperature_schematic_of_inner_Earth.jpg
Note that the temperature is 1650 °C (3000 °F) at about 485 km depth, or about 7.6% of the way to the center of the Earth. The diagram in the question is more or less correct -- except for th... | {
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"tags": "thermodynamics, pressure, earth, geophysics",
"url": null
} |
This is pretty easy to prove with Dynkin's multiplicative system theorem:
Theorem. Suppose $H$ is a vector space of bounded measurable functions on some measurable space $X$, which contains the constants and is closed under bounded pointwise convergence of sequences (i.e. if $f_n \in H$, $f_n \to f$ pointwise, and $|f... | {
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"lm_q2_score": 0.8267117898012105,
"openwebmath_perplexity": 119.22587011278756,
"openwebmath_score": 0.9617611765861511,
"ta... |
keras, tensorflow, convolution, deep-learning
Title: Implementing the SVHN CNN architecture in Srivastava et al. 2014 Dropout paper I am trying the implement the CNN architecture introduced in Srivastava et al. 2014 Dropout paper (appendix B.2), for the SVHN dataset. I implemented only the convolutional layers part, w... | {
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"tags": "keras, tensorflow, convolution, deep-learning",
"url": null
} |
algorithm, geometry
roll, pitch, _ = list(euler_from_quaternion(q, axes='sxyz'))
q = quaternion_from_euler(roll, pitch, 0, axes="sxyz")
laser = numpy.dot(quaternion_matrix(q), laser)
orientation = numpy.dot(quaternion_matrix(q), orientation)
2) Algebric solution : Rotation around Z in function of yaw
laser = [... | {
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javascript, performance, node.js, interview-questions
As for the rest of the code:
Your removeOrder could be implemented using filter, just like the all* functions; no need to manually push to a new array. And your showMostFrequent and itemsCount functions could both be implemented using map - again instead of manuall... | {
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linux, aes, sh, posix, openssl
Though I wrote it with maximum effort, a review is more than welcome.
The script follows:
#!/bin/bash
if [ "$#" -ne 1 ] || [ ! -f "$1" ]
then
echo "A single existing file needs to be given as an argument. Exiting."
else
input_filename="$1"
filepath=$(dirname "$1")
filena... | {
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"tags": "linux, aes, sh, posix, openssl",
"url": null
} |
general-relativity, black-holes, astrophysics, stars, galaxies
Just to be an especial-downer, let me point out that this doesn't really matter because high-eccentricity effects are practically unobservable. This is because LIGO detections are based on templated searches which rely on observing hundreds to thousands of... | {
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} |
python, csv
A few changes were made since the previous post:
Extract the filtering process into a generator function
Extract chunks from this iterator
I'm currently at 4 minutes of processing time for 30 million rows (1% of the file); I tested a few files and it works properly. However, with about 3 billion rows per... | {
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(xviii) “Absalom, Absalom”, by W. Faulkner; first edition, dedicated To R.C. on the second page.
(xix) “Ficciones”, by J-L. Borges, third edition with page 23 missing.
(xx) “Die Gottardbahn in kommerzieller Beziehung”, by G. Koller, W. Schmidlin, and G. Stoll.
(xxi) “The etchings of the Master Rembrandt van Rijn, fa... | {
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... |
ros, navigation, visual-odometry, tf2, robot-localization
Original comments
Comment by NZNobody on 2016-07-12:
I think I have found the cause of the issue, but am unsure who (which package) should be responsible for correcting it. I will edit my question accordingly.
If my obsolete odometer is offset from my base_link... | {
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} |
electromagnetism, magnetic-fields, electric-fields, potential
Starting from the Maxwell equation $\vec{\nabla} \cdot \vec{B} =0$, one infers the existence of a vector field $\vec{A}(t, \vec{x})$ such that the magnetic field can be written as $\vec{B} = \vec{\nabla} \times \vec{A}$. This is a mathematical theorem holdi... | {
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cc.complexity-theory, co.combinatorics, computability, automata-theory, nt.number-theory
claims in Theorem 2.3: "
An algebraic irrational real number cannot be generated by a one-stack machine, or equivalently, by a determistic push down automaton."
I have read and checked the article, have not found any gap in it, an... | {
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# Weird Power Series Expansion
When I do the power series expansion of $\displaystyle f(x)={1\over(4-2x^3)}$ and find the interval of convergence, I get two different answers depending on the way that I solve it.
If I break $f(x)$ up into $\displaystyle \frac14\left({1\over (1-(1/2)x^3)}\right)$ and then use the geom... | {
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"ta... |
condensed-matter, solid-state-physics, material-science, crystals, nanoscience
Another image (moved around slightly differently) is this one:
But to me this still seems to be a $(2 \times 2)$ which is lacking the second trench.
Another image I have fou... | {
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... |
Conclusion: The sequence does not converge.
• If $\mu = 2$, above argument shows that the sequence has a sub-sequence bounded away from $0$. If one find another sub-sequence which converges to $0$, then the limit doesn't exist. – achille hui Feb 6 '14 at 12:35
• We don't need to use irrationality measure, we can use H... | {
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"openwebmath_score": 0.9385761022567749,
"tags... |
windows, batch
echo º 0. Cancel º
echo º º
echo º º
echo º ... | {
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Let's be original. Let $$\frac 1{1-x} = \sum_{k \ge 0} x^k,$$ which means the derivative of this series is also convergent with the same radius of convergence (namely, $1$) by Taylor's theorem : $$x \left( \frac 1{(1-x)^2} \right) = x \left( \sum_{k \ge 0} k x^{k-1} \right) = \sum_{k \ge 0} k x^k.$$ Letting $x = 1/2$, ... | {
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"openwebmath_score": 0.9453651905059814,
"tag... |
Personally, I would do this without introducing $\epsilon '$. I'd just say that because $\epsilon/2 > 0$ we can find an $N_1$ such that:
$n > N_1 \Rightarrow |u_n - l_1| < \epsilon/2$ etc.
PS I can see the book did things a bit differently. I definitely don't like using $N'$ for the $l_2$ limit. Using $N_1, N_2$ seem... | {
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"lm_q1q2_score": 0.8064171791184583,
"lm_q2_score": 0.828938806208442,
"openwebmath_perplexity": 1481.8272625084667,
"openwebmath_score": 0.7614350318908691,
"tag... |
Feel++ supports various file formats that can be used as output mesh and data file formats for post-processing.
Format Description Mode Type `gmsh` Gmsh mesh file format Read/Write Ascii/Binary `ensightgold` Ensight Gold case format Write Binary `h3d` H3D file format Read Database `xdmf` XML/HDF5 file format Write `V... | {
"domain": "feelpp.org",
"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9559813538993888,
"lm_q1q2_score": 0.8163246661246598,
"lm_q2_score": 0.8539127492339909,
"openwebmath_perplexity": 13718.21862802429,
"openwebmath_score": 0.26109886169433594,
"tags": nu... |
c++, performance, search, simulation
squared vs square root
We pass in delta_x and delta_y:
if (std::hypot(bin.first[i]->position.x - position.x,
bin.first[i]->position.y - position.y) < radius) {
Finding length of hypoteneuse involves a slow sqrt().
But it would suffice to compare sum ... | {
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"tags": "c++, performance, search, simulation",
"url": null
} |
boolean-algebra
Title: Which is the correct XOR Gate Symbol I'm confused between 2 XOR gate symbols, they have a minor difference but I'd still like to know if they truly are identical.
One looks like -
The other, like
Notice, how for one of them the input lines are connected all the way and for the other, it's not.... | {
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"tags": "boolean-algebra",
"url": null
} |
general-relativity, cosmology, reference-frames, time-dilation, cosmic-microwave-background
Title: Is it possible to be at rest relative to the cosmic background radiation? Could there be a body in the universe which is at rest relative to the cosmic background radiation? And how much slower would time elapse at this ... | {
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"tags": "general-relativity, cosmology, reference-frames, time-dilation, cosmic-microwave-b... |
complexity-theory, np-complete
Title: Reduce variant of Vertex Cover to original decision-version Vertex cover problem Consider the following variation (let us call it Q) on the Vertex Cover problem: Given a Graph G and a number K, we are asked if there is a k-cover of G so that it is the minimum cover.
My question is... | {
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"tags": "complexity-theory, np-complete",
"url": null
} |
homework-and-exercises, reference-frames, rotational-dynamics, moment-of-inertia
Title: Translate inertia tensor, caculate distance matrix I know that inertia tensor of a sphere is
$$
2mr^2/5\begin{bmatrix}
1 & 0 & 0 \\
0 & 1 & 0 \\
0 & 0 & 1 \\
\end{bmatrix}
$$
Now if I translate it into a coordinate (x,y,... | {
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"tags": "homework-and-exercises, reference-frames, rotational-dynamics, moment-of-inertia",... |
metal, temperature, vapor-pressure, sublimation
That's a relatively crude approximation, for the enthalpy will hardly remain constant over such a wide range of temperatures. This page may contain better approximations designed for specific ranges. | {
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"tags": "metal, temperature, vapor-pressure, sublimation",
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} |
quantum-mechanics, quantum-information
If we use the Aaronson-Rothblum procedure to estimate $\textrm{Tr}(\rho\vec{\sigma})$ for each product of Pauli operators (denoted $\vec{\sigma}$), then the reconstruction that I assume you imagine is
$$ \widetilde{\rho} = \frac{1}{d} \sum_{\vec{\sigma}} c_{\sigma} \vec{\sigma} $... | {
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"id": 78792,
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"tags": "quantum-mechanics, quantum-information",
"url": null
} |
forces, electrostatics
$$V=\frac{Q}{C} \text{ and } C= \frac{\varepsilon A}{d},$$
where $C$ is capacitance and $\varepsilon$ is permittivity so
$$F=\frac{Q^2}{2\varepsilon A}.$$ Those equations you are using to get the force are technically only true under the approximation that the parallel plates are infinitely big.... | {
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} |
We would like to interpret this statement by saying that the sample mean converges to the true mean. Convergence in probability: Intuition: The probability that Xn differs from the X by more than ε (a fixed distance) is 0. where $F_n(x)$ is the cdf of $\sqrt{n}(\bar{X}_n-\mu)$ and $F(x)$ is the cdf for a $N(0,E(X_1^2))... | {
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"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9840936054891429,
"lm_q1q2_score": 0.8324865412561228,
"lm_q2_score": 0.8459424353665381,
"openwebmath_perplexity": 707.8092446788913,
"openwebmath_score": 0.87774658203125,
"tag... |
acid-base, aromatic-compounds, phenols, grignard-reagent
Title: Reaction of carbonyl cyclic diene with Grignard reagent
Predict the major product of this reaction:
The two compounds on the right are the possibilities that I thought of (weren't given in the question). According to me:
attack on carbonyl carbon by $\... | {
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"tags": "acid-base, aromatic-compounds, phenols, grignard-reagent",
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} |
• $\hat c$ is in the nullspace of A
• $A^T\lambda$ is in the rowspace of A
• we are adding $\hat c$ and $A^T\lambda$ to get vector $c$, which is apparently orthogonal to the nullspace of $A$.
If $A$ is square, then this can work. But, if $A$ is not square, then I do not understand how adding a vector in the nullspace ... | {
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"openwebmath_score": 0.8706853985786438,
... |
organic-chemistry, stoichiometry
$$
\left\{
\begin{array}{ll}
2x+y&=1.195 \text{ (C atoms)}\\
3x+2y+2z&=2\cdot1.2025 \text{ (H atoms)}\\
x+z+0.5(6.2325-0.5x)&=1.195\cdot2+1.2025 \text{ (O atoms)}
\end{array}
\right.
$$
Solving this simple system gives us $x=0.375, y= 0.445, z=0.195$
Then, the composition of mixtur... | {
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"openwebmath_score": null,
"tags": "organic-chemistry, stoichiometry",
"url": null
} |
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