text stringlengths 1 1.11k | source dict |
|---|---|
electromagnetism
This can be seen since the contribution from the left edge and the bottom will just be the current times the vertical distance traveled. Clearly the contribution from the left side and bottom will be the same as the contribution from the right side, since they traverse the same vertical distance. Sinc... | {
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"tags": "electromagnetism",
"url": null
} |
regression, survival-analysis
In the same Datascience answer that suggested to use the survival models (and the Wikipedia page) they also mentioned Poisson regression, but I'm not sure how I would apply this to my case.
So a long story short: I have just two questions: 1. Was my approach of using SGD 'correct' and do ... | {
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"tags": "regression, survival-analysis",
"url": null
} |
symmetric, and reflexive, it is called an equivalence relation. Revise with Concepts. Equivalence relation. >> We shall show that . I A relation that is not symmetric is not necessarily asymmetric . Which of the following statements about R is true? Click hereto get an answer to your question ️ Given an example of a re... | {
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"lm_q2_score": 0.8856314662716159,
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"openwebmath_score": 0.7882970571517944,
"tag... |
embryology
Langman's Medical Embryology (13th edition) T.W. Sadler
website | {
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"tags": "embryology",
"url": null
} |
planet, rotation, magnetic-field, venus, planetary-science
Title: Could a magnetosphere be created for Venus by recreated by spinning-up the planet to a 24 hour day? If Venus in it is current state, started rotating at the same rate as Earths 24hrs rotation, would it develop a magnetic field of roughly the same stren... | {
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"tags": "planet, rotation, magnetic-field, venus, planetary-science",
"url": null
} |
vba, excel
currentRange = vbNullString
For Each cell In myRange
If cell.Value <> vbNullString Then
r = cell.Value & mySeperator
currentRange = currentRange & r
End If
Next cell
currentRange = Left$(currentRange, Len(currentRange) - Len(mySeperator))
concatRange... | {
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"tags": "vba, excel",
"url": null
} |
computer-vision, point-cloud
Title: Why is the backprojection of the Middlesbury depth map "cone shaped"? I wrote some come to backproject depth maps. Testing it with the Middlebury cone set, I get:
First of all it has noise, which I shouldn't get from the ground truth, but more importantly it seems like the points a... | {
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"tags": "computer-vision, point-cloud",
"url": null
} |
Notice that all the cosets have 3 elements --- the same as the number of elements in the subgroup.
At this point, there are only 3 elements which aren't in any of the known cosets. These elements make up the last coset: . You can check that
3 represents the coset , but a given coset can be represented by any of its e... | {
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"tag... |
Remark $\$ That there are not more than $2$ roots does require proof, since generally modular quadratic equations can have more than $2$ roots, e.g. $\,x^2\equiv 1$ has the $4$ roots $\pm1, \pm3$ modulo $8$.
The analysis above as to how the factors of $3$ must distribute into each factor depends upon the uniqueness of... | {
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"lm_q1_score": 0.9861513912089533,
"lm_q1q2_score": 0.8260200861494742,
"lm_q2_score": 0.8376199572530448,
"openwebmath_perplexity": 158.12322544264333,
"openwebmath_score": 0.960946798324585,
"tag... |
moveit
Cartesian only though.
Comment by NEngelhard on 2016-11-26:
I think this could be implemented with a OrientationConstraint. I haven't used it yet, but I think you could set the absolute_z_axis_tolerance to something small and the other two much larger.
Comment by gvdhoorn on 2016-11-27:
OrientationConstraints a... | {
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"tags": "moveit",
"url": null
} |
ios, swift, core-data
let spanX = 0.007
let spanY = 0.007
let newRegin = MKCoordinateRegion(center: mapView.userLocation.coordinate, span:MKCoordinateSpanMake(spanX, spanY))
mapView.setRegion(newRegin, animated: true)
if (userLocations.count > 1){
let ... | {
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"tags": "ios, swift, core-data",
"url": null
} |
beginner, c, linked-list, pointers
// Type specificity not needed.
head = malloc(sizeof *head);
Remove redundant code:
newNode->next = NULL;
if (*headRefPtr == NULL) {
// newNode->next = NULL; // code not needed
Good uniform formatting.
The following code allocates, assigns, and then ignores that with a subseque... | {
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"tags": "beginner, c, linked-list, pointers",
"url": null
} |
c++, algorithm, c++11, image
abs( pInImg->m_R[row][col_w]-pInImg->m_R[min(row + 2,m_Height-2+(row + 2)%1)][col_w-2]) + abs(pInImg->m_R[row][col_w+2]-pInImg->m_R[min(row+2,m_Height-2+(row + 2)%1)][col_w]) + (1<<(HWP_SH_DOWN+1)))>>(2+HWP_SH_DOWN));
G2 = MAX( (abs(pInImg->m_R[max(row-1,abs... | {
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"openwebmath_score": null,
"tags": "c++, algorithm, c++11, image",
"url": null
} |
sampling, interpolation, reconstruction
Is there some way to determine what interpolation method (and parameters in the case of a windowed method) would give the most accurate results? If there are differences then some likely sources might be that the window on the Sinc wasn't wide enough, that the data wasn't reall... | {
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"tags": "sampling, interpolation, reconstruction",
"url": null
} |
console, rust, amazon-web-services
info!("Found {} objects", files_by_path.len());
let root = match expand_path(args.path) {
Ok(p) => p,
Err(error) => panic!("Failed to read root path: {}", error),
};
let second = root.clone();
match traverse_directories(
&root,
&secon... | {
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"openwebmath_score": null,
"tags": "console, rust, amazon-web-services",
"url": null
} |
php, api
Title: How is this for an API structure I have just written an API framework which I am hoping to implement into one of my large sites very soon. However, before I do so, I want to be sure that the script is well written and there are no obvious mistakes that I have missed.
As with most projects, the key here... | {
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"openwebmath_score": null,
"tags": "php, api",
"url": null
} |
visible-light, everyday-life, reflection
So basically the answer to your question is that the texture is created by intensity changes and shades at the macro level and diffuse reflection and non-flat random surface at the micro level.
With the superblack (or vantablack), there are practically no visible photons re-emi... | {
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"tags": "visible-light, everyday-life, reflection",
"url": null
} |
php, html, sql, css, smarty
Here are the rest of the files:
Raw HTML:
<!DOCTYPE html>
<html lang="en-US">
<!-- TODO: add <time> element -->
<!-- TODO: investigate other ways I could mark up the company name rather than a table -->
<!-- TODO: move the HTML header into its own Smarty file so that it can easi... | {
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"tags": "php, html, sql, css, smarty",
"url": null
} |
python, beginner
If you want to implement the algorithm yourself I would suggest, as @janos already did, to iterate first on the array to be sorted. This is better for performance and solves the issue of repeated elements.
A possible implementation could be:
def sanitize(arg):
predefined_list = [1,2]
pop_coun... | {
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"tags": "python, beginner",
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} |
ros, ros-melodic, python3, message-filters
Ah, I now see what goes wrong. When I try to run the node in the python 3 virtual environment it gives me the No module named 'rospy' not found error.
Comment by gvdhoorn on 2019-08-26:
You don't need to build all of ros_comm most likely. Copying out just the rospy client li... | {
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"tags": "ros, ros-melodic, python3, message-filters",
"url": null
} |
c++, converting, byte
I was slightly surprised to not see ntohl mentioned,
nor be64toh, but maybe {3, 5, 6, 7}-byte inBuffers
are just as important for the use case we're addressing.
Those standard functions should absolutely appear in
your automated test suite.
document the sign bit
The brief review context explicit... | {
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"tags": "c++, converting, byte",
"url": null
} |
python, pandas, data-mining, data-cleaning, dataframe
So I have used this code:
merged['duration'] = merged['duration'].str.replace(" hr.", '*60').str.replace(' ','+').str.replace(' min','*1').str.replace(' ','+').str.replace(' sec','*0.01').apply(eval)
From: How to Convert a Pandas Column having duration details in ... | {
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"tags": "python, pandas, data-mining, data-cleaning, dataframe",
"url": null
} |
gazebo, rviz
Title: Building imported into Gazebo not visible in Rviz
Hey, I am trying to import a complete building model into Gazebo (including the interiors like tables, chairs etc.). I am not sure if my approach is correct and I am in need your some assistance.
I converted the building file format into a .dae fil... | {
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• One important point is missing in this question: the conclusion is not the same independently of which $n_0$ is used: it only hods for $k\geq n_0$. – Marc van Leeuwen Mar 28 '15 at 9:20
• While it's maybe going a bit far here, there is so-called well-founded (or Noetherian) induction, which can be used for any partia... | {
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"lm_q2_score": 0.8438951084436077,
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"openwebmath_score": 0.8859107494354248,
"tag... |
planetary-ring, volcanism
Title: Can planetary rings form as a result of solidifed lava thrown up by volcanoes on the surface of small rocky moons/planets? I have heard that a moon in our solar system orbiting Saturn possesses geographical features that essentially spit out water and moisture from 'volcanoes' on its s... | {
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"url": null
} |
Updated on: 19 Aug 2009, 05:52
6
5
I came across two methods which I found very handy in solving some types of mixture problems. So I thought of sharing it with the gc community.
here they are
Rule of Alligation
It is the rule that enables us to find the ratio in which two or more ingredients at the given price must b... | {
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"lm_q1q2_score": 0.8200900698928778,
"lm_q2_score": 0.8596637469145054,
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"openwebmath_score": 0.7581515312194824,
"tags": n... |
c, linux
static int convert4(struct sockaddr_in *sa, const char *name)
{
return inet_pton(sa->sin_family = AF_INET, name, &sa->sin_addr);
}
static int convert6(struct sockaddr_in6 *sa, const char *name)
{
return inet_pton(sa->sin6_family = AF_INET6, name, &sa->sin6_addr);
}
int main(int argc, char** argv)
{
... | {
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"tags": "c, linux",
"url": null
} |
javascript, performance, algorithm, tree, complexity
Title: Calculating binary tree height as asked in the interview Input:
The first line contains the number of vertices \$n\$. The second line
contains \$n\$ integer numbers from the range \$\left[−1, n − 1\right]\$ representing the \$0\$-based index of the parent ... | {
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"tags": "javascript, performance, algorithm, tree, complexity",
"url": null
} |
java, unit-testing, junit
4
15
15
15
14
The algorithm must output the following solution, with a total cost of 2 + 5 + 13 + 11 = 31 (and the last row is not assigned any task because the worker is too expensive).
0
1
2
3
0
X
1
X
2
X
3
X
4 | {
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} |
fourier-transform, visualization
$$ \begin{align*}
\hat{f}_{a,b}(\xi)
&= \int_{-\infty}^{\infty} \mathrm{d}x \,f(x) \exp \left( -2\pi i x \xi \right) \delta(x-a)\\
&= f(a) \exp \left( -2\pi i a \xi \right) \,,
\end{align*} $$
because you end with a simple sinusoidal result.
There may be a computational advantage to u... | {
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"tags": "fourier-transform, visualization",
"url": null
} |
atmosphere, clouds, ice, atmospheric-optics
reflecting at least a factor of 5-6 stronger that surrounding pixels and may substantially increase cloud albedo [Takano and Liou, 1989], relative to diffuse reflectance from randomly oriented ice particles. This is significant as cirrus clouds, composed mostly of aspherical... | {
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"tags": "atmosphere, clouds, ice, atmospheric-optics",
"url": null
} |
php, object-oriented
Anyhow, I'm not going into details on how you should refactor this to be SOLID compliant, that's part of the learning curve. The simple fact of the matter is that, yes OOP is confusing at first, and at first you might not even need constructors, access modifiers (public, protected or private), let... | {
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c#, validation, extension-methods, framework, expression-trees
public static IImmutableList<IValidationRule<T, object>> For<T>() => ImmutableList<IValidationRule<T, object>>.Empty;
}
public static class ValidationRuleCollectionExtensions
{
public static IImmutableList<IValidationRule<T, TContext>> Add<T, TContext... | {
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... |
vapor-pressure, organometallic-compounds, alkali-metals
Schwindeman, J. A.; Woltermann, C. J.; Letchford, R. J. Safe Handling of Organolithium Compounds in the Laboratory. Chemical Health and Safety 2002, 9 (3), 6–11. https://doi.org/10/ctj2sj. (PDF mirror: chemistry.ucla.edu) | {
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"openwebmath_score": null,
"tags": "vapor-pressure, organometallic-compounds, alkali-metals",
"url": null
} |
energy, energy-conservation, momentum, centripetal-force
Details can be seen in The centripetal force work problem – solved!
Thanks to every one who answered this question, I wouldn't arrive to the right answer without you all. | {
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python, file-system, memory-optimization
parser.add_argument('-u', '--unicode', action="store_true",
help='Make `\w`, `\W`, `\b`, `\B`, `\d`, `\D`, `\s` and '
'`\S` dependent on the Unicode character properties '
'database.')
parser.add_argument('-x... | {
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"openwebmath_score": null,
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"url": null
} |
Gauss Elimination Method C++. learn how to modify the Naïve Gauss elimination method to the Gaussian elimination with partial pivoting method to avoid pitfalls of the former method, 5. It reads: 0x + 0y + 0z = -1, in other words, 0 = -1!!! This is never true. Gauss zaman içinde Yunanca, Latince ve edebiyat eğitimi görd... | {
"domain": "globalbeddingitalia.it",
"id": null,
"lm_label": "1. YES\n2. YES\n\n",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9859363717170516,
"lm_q1q2_score": 0.8060764148580296,
"lm_q2_score": 0.817574478416099,
"openwebmath_perplexity": 712.3485932488467,
"openwebmath_score": 0.63821941614151,
... |
3. ### math
Evaluate the following indefinite integral by using the given substitution to reduce the integral to standard form integral 2(2x+6)^5 dx, u=2x+6
4. ### Calculus
Use the shell method to set up, but do not evaluate, an integral representing the volume of the solid generated by revolving the region bounded ... | {
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"lm_q1_score": 0.97594644290792,
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"lm_q2_score": 0.8519528076067262,
"openwebmath_perplexity": 1302.709637742365,
"openwebmath_score": 0.9672595262527466,
"tags": null,... |
python, web-scraping, database, sqlite, python-requests
conn.commit()
print("Done!") Your Set, Tuple and BinaryIO imports are unused so delete them.
SCRIPT does not belong in this program. It should be moved to a separate .sql file. But further than that, the whole initialize_database routine should not be in... | {
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"url": null
} |
This is similar to the sort of question where we ask, on one hand, how many ways there are to choose a committee of two from a club of 20, and, on the other hand, how many ways there are to choose a president and a treasurer from a club of 20. The members of the committee may well play different roles, but the first qu... | {
"domain": "themathdoctors.org",
"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9766692298333416,
"lm_q1q2_score": 0.8138824826189547,
"lm_q2_score": 0.8333245870332531,
"openwebmath_perplexity": 457.16322640316815,
"openwebmath_score": 0.6896734237670898,
"t... |
thermodynamics, speed-of-light, radiation, elements
Title: What is the fastest heat can travel? The perfect solid heat sink What dictates the conductivity of heat in an element or medium? Consider the shape, volume, area, and distance heat travels from vibrating atom to atom, not through the excitement of the an atom ... | {
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"openwebmath_score": null,
"tags": "thermodynamics, speed-of-light, radiation, elements",
"url": null
} |
c++, parsing, json, qt
#endif // QJSON_H
qjson.cpp:
#include "qjson.h"
#include <QStringList>
QJson::QJson()
{
}
/* ----------------------------------------------------------------------------------------------------------------- */
// ENCODER / SERIALIZER
/* --------------------------------------------------------... | {
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"openwebmath_score": null,
"tags": "c++, parsing, json, qt",
"url": null
} |
human-biology, sleep
The first significant result of this study is that the pattern of brain activation associated with auditory stimulation was strikingly similar in wakefulness and sleep, suggesting that sensory processing occurred in both conditions. However, we found qualitative differences in brain activation ass... | {
"domain": "biology.stackexchange",
"id": 3433,
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"lm_q2_score": null,
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"openwebmath_score": null,
"tags": "human-biology, sleep",
"url": null
} |
quantum-mechanics, history
$$
\Delta r\Delta t~\simeq~\frac{2G\hbar}{c^4}~=~{\ell}^2_{Planck}/c.
$$
So this argument can be pushed to understand the nature of noncommutative coordinates in quantum gravity. | {
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Using the short-hands $$t_i=s\cdot e^{x_i}\qquad s=\left(\sum_je^{x_j}\right)^{-1}$$ the diagonal and off-diagonal entries of the Hessian are $$t_i(1-t_i)\qquad\text{and}\qquad -t_it_j$$ respectively, hence it suffices to show that $Q(u)\geqslant0$ for every $u=(u_i)$, where $$Q(u)=\sum_i t_i(1-t_i)u_i^2- \sum_{i\ne j}... | {
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"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9799765581257487,
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"lm_q2_score": 0.8244619285331332,
"openwebmath_perplexity": 217.2860396982329,
"openwebmath_score": 0.9605584740638733,
"tag... |
cnc
Title: Moldable rubber for "feet" I’m trying to inject some kind of rubber around an aluminum strut to form “feet” for a robot. I’ve already milled the mold, but I’m having trouble finding an inexpensive and readily available rubber compound that will cure without exposure to air. Ideally it should cure to about t... | {
"domain": "robotics.stackexchange",
"id": 221,
"lm_label": null,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "cnc",
"url": null
} |
python, scikit-learn, cross-validation, gridsearchcv
Title: What is GridSearchCV doing after it finishes evaluating the performance of parameter combinations that takes so long? I'm running GridSearchCV to tune some parameters. For example:
params = {
'max_depth':[18,21]
}
gscv = GridSearchCV(
xgbc,
param... | {
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"id": 4598,
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"openwebmath_score": null,
"tags": "python, scikit-learn, cross-validation, gridsearchcv",
"url": null
} |
ethology, behaviour, anthropology, instinct
Going back a step; what is laughter?
To fully place laughter in the context of our social constructs, we must first understand what laughter is. Unanimously, all types of laughter are non-verbal expressions of emotion (and above there is a reference to how laughter fits in a... | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "ethology, behaviour, anthropology, instinct",
"url": null
} |
charge, definition, si-units, metrology
In that case it would have been justified to keep one more digit for $e$ Indeed, they kept the digit 4 after the 3 even though the uncertainty on that digit was 8 (83 on the three last digits 341).
When was that figure $2.3\times 10^{-10}$ obtained ? What was the best value of $... | {
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"tags": "charge, definition, si-units, metrology",
"url": null
} |
java, beginner, game, mvc, swing
The Model/View relation - how I like it - can be demonstrated on this classic:
Consider having blog application, so for each article you have date+time of publishing the article.
Then Model should contain UTC timestamp value (can be unix timestamp, if you need only dates since 1970 onw... | {
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"tags": "java, beginner, game, mvc, swing",
"url": null
} |
beginner, strings, haskell, recursion, reinventing-the-wheel
In this case the concept you're looking for is a span. That is, the part of a list at the front that matches a predicate, and then the rest. In this case we care about the predicates isSpace and not . isSpace.
-- REPL session, if you're not familiar with REP... | {
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"tags": "beginner, strings, haskell, recursion, reinventing-the-wheel",
"url": null
} |
algebras with polyadic composition operations. z = y – 1 So, we may have, \[\underbrace {R \circ R \circ \ldots \circ R}_n = {R^n}.$, Suppose the relations $$R$$ and $$S$$ are defined by their matrices $$M_R$$ and $$M_S.$$ Then the composition of relations $$S \circ R = RS$$ is represented by the matrix product of $$M_... | {
"domain": "tabvue.com",
"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9683812299938006,
"lm_q1q2_score": 0.8005721860597742,
"lm_q2_score": 0.8267117962054049,
"openwebmath_perplexity": 1378.5681441113877,
"openwebmath_score": 0.7744567394256592,
"tags": nu... |
wheel, usb, encoding
Title: How do I measure the distance that a cord (string) has moved? For a pet project, I am trying to fly a kite using my computer. I need to measure how far a cord extends from a device. I also need to somehow read out the results on my computer. So I need to connect this to my pc, preferably ... | {
"domain": "robotics.stackexchange",
"id": 140,
"lm_label": null,
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"lm_q2_score": null,
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"openwebmath_score": null,
"tags": "wheel, usb, encoding",
"url": null
} |
particle-physics, experimental-physics, higgs, large-hadron-collider, beyond-the-standard-model
Title: What news about the second Higgs mode (or the mysterious particle) is anticipated to be seen at LHC around 750 GeV? A few months ago, there were press releases about a possible second Higgs mode unveiled by LHC exper... | {
"domain": "physics.stackexchange",
"id": 34294,
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"tags": "particle-physics, experimental-physics, higgs, large-hadron-collider, beyond-the-s... |
black-holes, metric-tensor, event-horizon, topology, holographic-principle
https://en.wikipedia.org/wiki/Subspace_topology
My question is regarding how subsets of topological spaces can be equipped with a different topology? In particular, how can a subspace of spacetime, like the interior of a black hole be treated w... | {
"domain": "physics.stackexchange",
"id": 63814,
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"openwebmath_score": null,
"tags": "black-holes, metric-tensor, event-horizon, topology, holographic-principle",
"ur... |
python
Title: Using Python to model a single elimination tournament I'm learning python and I want to model a single elimination tournament like they use in athletic events like tennis, basketball, etc. The idea would be to insert some meaningful metrics to determine the winner. I've already got a database that I pl... | {
"domain": "codereview.stackexchange",
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"tags": "python",
"url": null
} |
Analysis of / Analysis of p(x) = po + p\ x + P2 x 2 Match
p(k)(i) = f (k)( 1 )
f(x) = lnx /(l)=lnl = 0 p(x) = po + p! x + p 2 x 2 = Po + Pi + P2 Po + Pi + Vi = 0
f[x) = \ /'(1) = I = 1 p'(x)=p 1+ 2p 2 x p'(l) = Pl + 2p 2 Pl +2p 2 = l
f”(x) = £ /»(l) = -£ = -l p”{x) = 2p 2 P”(l) = 2p 2 2p2 = -l
Now we solve a syste... | {
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"openwebmath_perplexity": 1695.6033027463616,
"openwebmath_score": 0.7549728751182556,
"tags"... |
molecular-orbital-theory
Basically the only interesting quantity that you can get from an orbital energy is the first ionization energy based on Koopmans' theorem, which also is just approximately true. | {
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} |
ros-kinetic
import time
import rospy
from sensor_msgs.msg import Range
#GPIO Mode (BOARD / BCM)
GPIO.setmode(GPIO.BCM)
#set GPIO Pins
GPIO_TRIGGER = 17
GPIO_ECHO = 18
#set GPIO direction (IN / OUT)
GPIO.setup(GPIO_TRIGGER, GPIO.OUT)
GPIO.setup(GPIO_ECHO, GPIO.IN)
def distance():
# set Trigger to HIGH
GPI... | {
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"openwebmath_score": null,
"tags": "ros-kinetic",
"url": null
} |
php, object-oriented, parsing, xml, iteration
Note: The reason for the PagesController class and the index() method is because I'm using the Laravel framework.
The xml-file is generated from nmap which I plan to run every five minutes or so.
This is what the xml looks like:
<?xml version="1.0" encoding="UTF-8"?>
<!DO... | {
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"id": 33257,
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"openwebmath_score": null,
"tags": "php, object-oriented, parsing, xml, iteration",
"url": null
} |
quantum-field-theory, research-level, renormalization, analyticity
Title: What is the significance of the branch cut in renormalization group logarithms? What is the physical significance of the branch cut in renormalization group logarithms?
(Is this just an avatar of the optical theorem, or is there something to be ... | {
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"tags": "quantum-field-theory, research-level, renormalization, analyticity",
"url": null
... |
ros, rosseral-arduino, ros-kinetic, 2dlaserscan
Title: Sending arrays (LaserScan msg) in rosserial
Hi, I'm trying to send data from a temperature sensor using the intensities array within a LaserScan message (this will then be manipulated within ROS further. using laserScan does make sense later down the road).
The s... | {
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"tags": "ros, rosseral-arduino, ros-kinetic, 2dlaserscan",
"url": null
} |
quantum-mechanics, mathematical-physics, path-integral, normalization
see e.g. Section V of my Phys.SE answer here. Equivalently,
$$ f(t)~\simeq~ 1 \quad\text{for} \quad t~\lesssim~ \tau, \tag{F}$$
Comparing eqs. (D) & (F), we deduce that
$$c ~\ll ~1/\tau .\tag{G}$$
Of course, the correct path integral normalization... | {
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"url": n... |
special-relativity, group-theory, representation-theory, spinors, covariance
Let's specialize that general idea a little bit. Consider a theory governed by some set of equations of motion. For example, consider Maxwell's equations, which are the equations of motion for the electromagnetic field. The purpose of the equ... | {
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"... |
gazebo-plugin
Originally posted by federico.nardi on Gazebo Answers with karma: 23 on 2018-06-22
Post score: 0
That LogicalCameraImage message is not stamped (i.e. it doesn't have a header), so I think it's not possible to know the exact time from the message itself.
I think you're doing the right thing by connecting... | {
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algorithms, graphs, np-complete, dynamic-programming, recurrence-relation
if (visited.contains(node)) {
continue;
}
visited.add(node);
if (node.x < stateVotes.size() - 1) {
queue.add(new Node(node.x + 1, node.y));
queue.add(new Node(n... | {
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"openwebmath_score": null,
"tags": "algorithms, graphs, np-complete, dynamic-programming, recurrence-relation",
"url": nu... |
→ A learn how we can rephrase some our! Shows page 2 - 3 out of 3 pages.. Theorem 3 -- -- > be... Invertible f. Definition inverse function F−1: B → A is unique the... ( f… now let f: A -- -- > B be A function invertible. Then F−1 f = 1A and f F−1 = 1B you g ( x ) and we are with! Is one to one f from A to B is invertib... | {
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"id": null,
"lm_label": "1. YES\n2. YES\n\n",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9572777987970315,
"lm_q1q2_score": 0.8447286174361702,
"lm_q2_score": 0.8824278788223264,
"openwebmath_perplexity": 805.1243433361718,
"openwebmath_score": 0.8342097401618958,
... |
cmake
Title: Compile without tests to build a debian package
Hello,
I'm making the debian package for Debian of Gazebo 1.8.2 but I'm doing that in a chroot directory, so I do not have display output and tests doesn't pass. What I want is to disable tests to build the package for Debian, do you know if there is a way ... | {
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"id": 3324,
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"tags": "cmake",
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} |
c++, programming-challenge, graph, depth-first-search
I believe I have implemented a messy solution. I want advice on two fronts:
How many a more gracefully implement the DFS algorithm in C++? The current format appears to be very messy and lines like:
for(long i=0; i<ei[ti].size(); ++i){
ci+= dfs(ei,vi,ei[ti][i]... | {
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"tags": "c++, programming-challenge, graph, depth-first-search",
"url": null
} |
meteorology, atmosphere, atmospheric-circulation, convection
Title: Why do the dry and moist adiabatic lapse rates converge with height? Near the surface, the slope of the moist adiabats are much steeper than dry adiabats due (as I understand it) to the the latent heat released as water vapour condenses. The differenc... | {
"domain": "earthscience.stackexchange",
"id": 482,
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"tags": "meteorology, atmosphere, atmospheric-circulation, convection",
"url": null
} |
logic, loop-invariants, hoare-logic
The first item can also be proved more formally, but I think you get the idea.
About your attempt: you used the equivalence
$$
\begin{array}{l}
\big((S_1 = S_2 \iff X = Y \land E = true) \land (X = \Lambda)\big)
\\
\equiv (S_1 = S_2 \iff X = \Lambda \land Y = \Lambda \land E = tru... | {
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} |
• better to use the law of logs and use the usual definition of the derivative. See my answer below. (+1) – James Oct 31 '18 at 4:15
• nice approach. =) – Siong Thye Goh Oct 31 '18 at 4:18
• Can I ask you a question, since I know you are the Linear Programming/optimization guru around here, do you have any book recomme... | {
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"openwebmath_score": 0.9966297149658203,
"tags... |
ros-kinetic, qt, rqt
myImages.qrc
<RCC>
<qresource prefix="/buttons">
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myPlugin.ui (generated by QT 4 designer)
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# Differentiability of eigenvalues of positive-definite symmetric matrices
Let $$A\in M(n,\mathbb{R})$$ be an invertible matrix. Consider the (real) eigenvalues $$\lambda_1,\cdots,\lambda_n$$, in increasing order, of the positive-definite symmetric matrix $$A^t A$$. We shall denote the eigenvalues as $$\lambda_i(A)$$.... | {
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c#
var keyStart = 0;
var valueStart = sepIndex + 1;
while (keyStart < sepIndex)
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// scan for the end of the token
var keyEnd = str.IndexOfAny(delims, keyStart);
var valueEnd = keyEnd < sepIndex
? str.IndexOfAny(delims, valueStart)
: str.Length;
// e... | {
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c++, generics, template, c++14, polymorphism
whereas you seem to prefer
template<typename T> auto X::foo(T t) const -> decltype(t+1) {
return t+1;
}
which in my opinion is just too much stuff on a single line.
It's not a question of columns-per-source-line; it's a question of ideas-per-source-line. One idea per s... | {
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20. Jun 14, 2014
### Saitama
There is a much shorter solution. Use complex numbers. :)
Do you see that the following equation holds?
$$b+37i=(a+11i)e^{i\pi/3}$$
Just compare the imaginary and real parts. | {
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grovers-algorithm, nielsen-and-chuang, hamiltonian-simulation
It is well-known how the quantum simulation of the several Hamiltonian can be performed. For example:
For the Hamiltonian $H=|x\rangle\langle x|+|ψ\rangle\langle ψ|$ the quantum simulation exist in the Nielsen and Chuang Textbook - page 258 paragraph 6.2 an... | {
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statistical-mechanics, entropy, quantum-information, information
Edit (March 11, 2012): I accepted Nathaniel's answer as satisfying under the given circumstances, though he forgot to mention a fouth possibility that I prefer; namely that the complete knowledge about a quantum system is in fact described by a density m... | {
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"tags": "statistical-mechanics, entropy, quantum-information, information",
"url": null
} |
c#, asynchronous, tcp
if (hasMessage)
{
try
{
var message = Mapper.ToPrescottMessage(data.Result);
if (message is Message1)
HandleMessage((Message1)message);
... | {
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"tags": "c#, asynchronous, tcp",
"url": null
} |
data-structures, trees, avl-trees
Q) Is it possible to balance tree using such approach ? If yes, then how?
Q) If no, then why not? What would be the flaws/problems that would arise using such approach ? What you are asking is simply how to balance a binary search tree (BST) $T$. By the way, the phrase "un-balanced AV... | {
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"tags": "data-structures, trees, avl-trees",
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reinforcement-learning, model-based-methods
late in episodes, otherwise your model will just be overfitting to the start of the episode and will give a poor performance on these other states, thus slowing down or even prohibiting learning of an optimal policy. | {
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"tags": "reinforcement-learning, model-based-methods",
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c++, optimization, game
// Loop until they are dead or they guess the number.
for(int lives = 10;lives > 0; lives--)
{
cout << ">>";
cin >> input;
// Check if the data is valid according to our wishes.
if(isValidInput_Int(input))
{
// Store the integer we wa... | {
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"openwebmath_score": null,
"tags": "c++, optimization, game",
"url": null
} |
ros, urdf, moveit, moveit-setup-assistant
Comment by Speedracer1702 on 2021-06-08:
I thought about doing that but the log is really long (387 lines).
Comment by Ranjit Kathiriya on 2021-06-08:
It's okay you can post it.
The tutorial has you install MoveIt from source. That means, it is local to that workspace. When y... | {
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"tags": "ros, urdf, moveit, moveit-setup-assistant",
"url": null
} |
magnetic-fields, electromagnetic-induction
Title: Does one element of a current carrying wire exert a force on another element of the same wire? Lorentz force $\vec F$ for an external magnetic field $\vec B$ is $$ \vec F = q \vec v \times \vec B $$ and the magnitude of this force is $ F = (qv \times B) \sin \theta $.... | {
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"tags": "magnetic-fields, electromagnetic-induction",
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machine-learning, neural-network, backpropagation, gan
All together this is just a CNN and the backpropagation will be computed in the exact same way. First we pass through a noise vector, it goes through the generator, some random image gets produced at its output, that then goes through the discriminator and gets cl... | {
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"tags": "machine-learning, neural-network, backpropagation, gan",
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} |
For a subset $B\subset \mathbb{R}^2$ I will use the notation $B^c$ to denote its complement, $\mathbb{R}^2 \setminus B$.
Let me start with a basic observation: If $A$ is a closed subset of $\mathbb{R}^2$, then for each connected component $U$ of $A^c$, the boundary of $U$ is contained in $A$.
Now, back to the questio... | {
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• A lot of counting problems can be solved with two simple (and maybe obvious) techniques.
• The product rule: If there are $$m$$ ways to select the first item, and $$n$$ ways to select the select the second item, then there are $$mn$$ ways to select the two items.
• … and so on for three or more things to be selected.... | {
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"openwebmath_perplexity": 299.4113897653736,
"openwebmath_score": 0.8001646995544434,
"tags": null,
"... |
ros, roslaunch, sicktoolbox-wrapper
Any ideas? I am really hoping to start this node using roslaunch... I am not a programmer and my code is already ugly.. I don't want to revert to using the working line rosrun sicktoolbox_wrapper sicklms using expect. if you could suggest what is going south I would greatly apprecia... | {
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python, python-3.x, excel
def get_value(data, location):
return data[location[0]][location[1]] | {
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algorithms, graphs
Is there an efficient algorithm solving SCATTERED SET? I don't know if there is a polynomial-time algorithm (it feels like it might be NP-hard), but here are some plausible algorithmic approaches you might could consider, if you need to solve it in practice:
Heuristics
One well-explored algorithm is... | {
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"tags": "algorithms, graphs",
"url": null
} |
roslaunch, stereo, usb-cam, camera
Title: Running 2 different cameras using usb_cam
Hello, I'm using the usb_cam package and I'm trying to launch my 2 cameras at the same time. I'm using the following launch file:
<launch>
<group ns="camera1">
<node name="usb_cam1" pkg="usb_cam" type="usb_cam_node" output="... | {
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"tags": "roslaunch, stereo, usb-cam, camera",
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everyday-chemistry, electrochemistry, fuel, electricity
Long answer:
Your question is pretty vague, it is not clear what you mean by "usable electricity".
If you need light, it is easier (cheaper, reliable) to use candles or oil lamps.
If you need electricity to drive electric devices, than you most probably need a pr... | {
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"tags": "everyday-chemistry, electrochemistry, fuel, electricity",
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homework-and-exercises, classical-mechanics, friction, work
Title: Conservation of energy with friction on a pool ball I have a problem where I am given the mass $m$, radius $r$ and friction $\mu$ between a pool ball and table. The ball is not initially moving but at $t=0$ is struck by an impulse
$$p=\int_{-\epsilon}... | {
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"tags": "homework-and-exercises, classical-mechanics, friction, work",
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} |
python, python-3.x, generator, properties
What other side-effects could arise when using these kind of properties?
Note that this code is not intended for use in productive environments, but is of academic interest only. The proper way to prime a generator for accepting values is to send an initial None value.
Yield w... | {
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Hint: Consider separately the cases $p<1$ and $p>1$. For the case that $p<1$, note that $$f(p^nx)=f(x).$$ What happens if you pass to the limit as $n \rightarrow \infty$? Can you repeat this idea for $p>1$? Hope this helps!
Yes if $|p| \not = 1$.
Suppose $|p|\not = 1$. If $p=0$, we're done. If $p\not= 0$, without loss ... | {
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"openwebmath_score": 0.9509497284889221,
"ta... |
an inductor and a capacitor wired in series, as shown below. 5s with laplace transform. The general solutions to the state-space equations, therefore, are solutions to all such sets of equations. kristakingmath. The analysis is based on the π-model of a RLC load and is developed for submicron devices. Ld 2 Q/dt 2 = -Rd... | {
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"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9919380079950701,
"lm_q1q2_score": 0.8063139947653039,
"lm_q2_score": 0.8128673246376009,
"openwebmath_perplexity": 608.3380399695826,
"openwebmath_score": 0.610039472579956,
"tag... |
particle-physics, quantum-chromodynamics
Yes, it is the characteristic scale of confinement and all other typical processes of pure QCD - those that don't depend on the current quark masses etc. In most sentences about the QCD scale, including your quote, the detailed numerical constant is not too important and the se... | {
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"tags": "particle-physics, quantum-chromodynamics",
"url": null
} |
genetics, evolution, terminology, population-genetics, mutations
If a process is deterministic, it means that for a given input there is a single possible output. If a process is stochastic, then there are several (potentially an infinite number) of possible outputs. Now, stochastic does not mean fair or uniformly dis... | {
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"tags": "genetics, evolution, terminology, population-genetics, mutations",
"url": null
} |
genetics, homework
II. The Japanese fish are homozygous for the left-eyed allele (LL), whereas in the west coast fish both left-eyed (L) and right-eyed (R) alleles occur in equal proportions. Heterozygous individuals (LR) have an equal chance of developing into either the left- or right-eyed form.
III. There are three... | {
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