text stringlengths 1 1.11k | source dict |
|---|---|
dft, power-spectral-density, signal-power
close all;
N=50; %number of periods
Fs= 4096;
snr=10;
M=256; %length of FFT
Fres=Fs/M;
Mul_factor=20;
F_c=Fres*Mul_factor; %in Hz%
Window_length=128;
Overlap=floor(0.4*Window_length);
x=0:1/Fs:N*(1/F_c);
y=sin(2*pi*x*F_c) + 1/sqrt(snr).*randn(1,length(x));
[ppx,w]=pwe... | {
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"openwebmath_score": null,
"tags": "dft, power-spectral-density, signal-power",
"url": null
} |
algorithms, time-complexity, asymptotics
If we denote the running time of the algorithm on the input $x$ by $T(x)$, and the length of $x$ by $|x|$, then we can see the difference between these two equivalent definitions by writing them out formally.
The first definition is
$$
\max_{|x| = n} T(x) = O(n^2),
$$
where the... | {
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"openwebmath_score": null,
"tags": "algorithms, time-complexity, asymptotics",
"url": null
} |
function is discussed: Gaston Maurice Julia: …memoir on the iteration of polynomial functions (functions whose terms are all multiples of the variable raised to a whole number; e. 3 (NOTES #18-21 only) & 6. Simplifying Absolute Value Expressions. To find the zeros of a polynomial function, if it can be factored, factor... | {
"domain": "fidelylite.it",
"id": null,
"lm_label": "1. YES\n2. YES\n\n",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9902915235185259,
"lm_q1q2_score": 0.8002221028599262,
"lm_q2_score": 0.808067204308405,
"openwebmath_perplexity": 1259.1221624115822,
"openwebmath_score": 0.44001689553260803,
"ta... |
python, mathematics, numpy
for j in range(rows):
for i in range(cols):
k = j * rows + i
k1 = k + 1 if i < cols - 1 else k - 1
k2 = k - 1 if i > 0 else k + 1
k3 = k + cols if j < rows - 1 else k - cols
k4 = k - cols if j > 0 else k + cols
... | {
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"openwebmath_score": null,
"tags": "python, mathematics, numpy",
"url": null
} |
Led
01 | {
"domain": "bernardklima.cz",
"id": null,
"lm_label": "1. YES\n2. YES\n\n",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9820137868795702,
"lm_q1q2_score": 0.8815491438590989,
"lm_q2_score": 0.8976952825278492,
"openwebmath_perplexity": 369.1545041757962,
"openwebmath_score": 0.9370395541191101,
"t... |
clustering, image-classification, supervised-learning, multilabel-classification, semi-supervised-learning
Title: Is there an algorithm for categorizing unlabeled samples into K classes? I am not sure if this would be considered unsupervised, or semi-supervised learning. I am looking for an algorithm that will take N... | {
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"tags": "clustering, image-classification, supervised-learning, multilabel-classificatio... |
hmm
Abhi
is it a question of log
Abhi
🤔.
Abhi
Commplementary angles
hello
Sherica
im all ears I need to learn
Sherica
right! what he said ⤴⤴⤴
Tamia
hii
Uday
what is a good calculator for all algebra; would a Casio fx 260 work with all algebra equations? please name the cheapest, thanks.
a perfect square v²+2v+_
kkk ni... | {
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"lm_q1_score": 0.9814534354878827,
"lm_q1q2_score": 0.8241597815631382,
"lm_q2_score": 0.8397339616560072,
"openwebmath_perplexity": 1021.595568446835,
"openwebmath_score": 0.6192161440849304,
"tags... |
c++, template, coordinate-system
Using std::array instead of a raw c-style array might fix some of the above or make implementing them (e.g. iterators) easier... | {
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"openwebmath_score": null,
"tags": "c++, template, coordinate-system",
"url": null
} |
the-moon, artificial-satellite
Title: Objection on artificial moon for lighting Some days ago i read about China's artificial moon mission for lighting cities
In my junior classes i was taught the effect of Moon's gravity on tidal waves.
According to me this is a very dangerous mission this can cause floods due to ad... | {
"domain": "astronomy.stackexchange",
"id": 3404,
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"lm_q2_score": null,
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"openwebmath_score": null,
"tags": "the-moon, artificial-satellite",
"url": null
} |
c#, mvc, asp.net, asp.net-mvc, controller
// POST: Hardware/Edit/5
// To protect from overposting attacks, please enable the specific properties you want to bind to, for
// more details see http://go.microsoft.com/fwlink/?LinkId=317598.
[HttpPost]
[ValidateAntiForgeryToken]
public ActionResult Edi... | {
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "c#, mvc, asp.net, asp.net-mvc, controller",
"url": null
} |
proteins
David Eisenberg's group created profiles based on alignments from known structures which were more sensitive to discovering whether a given protein sequence was related to a given structure, solving what he called the 'inverse folding problem'. More recently HMMs have been used from raw aligned sequences whi... | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "proteins",
"url": null
} |
kalman-filters, estimation, least-squares, parameter-estimation
Do we assume the state is a random variable since there might be uncertainty in our model? A resistance isn’t a particularly dynamic state, should be an unknown constant, but you might have a bin of resistors where they might vary. Taking one “randomly” ... | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "kalman-filters, estimation, least-squares, parameter-estimation",
"url": null
} |
ros, installation, ros-groovy, rosaria
Or use this makefile: https://reedatadept-rosaria.googlecode.com/hg/ROSARIA/Makefile and then run "make" in the amor-ros-pkg directory.
Originally posted by ReedHedges with karma: 821 on 2013-03-20
This answer was ACCEPTED on the original site
Post score: 1 | {
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "ros, installation, ros-groovy, rosaria",
"url": null
} |
algorithms, data-structures, sorting
The question is definitely aiming towards a Min-heap/AVL tree solution, which can in fact achieve $O(n\log(k))$ time complexity.
However i'm wondering if there exists a different approach, like a merge variant which can achieve the same result.
The closest I've seen is to merge all... | {
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"tags": "algorithms, data-structures, sorting",
"url": null
} |
gazebo, ros-kinetic
</robot>
I tried some tutorials but none of then worked for me.
I`m using:
OS: Ubuntu 16.04
ROS Version: Kinetic
Thank you
Originally posted by ricardo.sutana on ROS Answers with karma: 3 on 2020-01-22
Post score: 0
Original comments
Comment by vbs on 2020-01-22:
Hi Ricardo! I didn't get your ... | {
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"tags": "gazebo, ros-kinetic",
"url": null
} |
Theorem HSC
Homogeneous Systems are Consistent
Suppose that a system of linear equations is homogeneous. Then the system is consistent.
Proof Set each variable of the system to zero. When substituting these values into each equation, the left-hand side evaluates to zero, no matter what the coefficients are. Since a ... | {
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"lm_q2_score": 0.8198933381139645,
"openwebmath_perplexity": 1463.3392804900752,
"openwebmath_score": 0.9845515489578247,
"tags": n... |
c#, functional-programming
Or
var analysis2 = analysis1
.Customize()
.WithWaterTableDepth(200)
.UseUWProfile()
.Build();
So order/amount of parameters to override is not under C# control:
Wizard scenario requires all the parameters to be specified in the predet... | {
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"openwebmath_score": null,
"tags": "c#, functional-programming",
"url": null
} |
tex
\newcommand{\usebibproc}{biber} %TOSET and changing this variable to one of these: bibtex/biber
\ifthenelse{\equal{\usebibproc}{bibtex} }{}{
\usepackage[ % stuff in case of biber: .bib file, style etc.
backend=biber,
style=numeric,
citestyle=num... | {
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"openwebmath_score": null,
"tags": "tex",
"url": null
} |
newtonian-mechanics, forces, newtonian-gravity
Try standing on shredded glass. The normal force gets redistributed to a few positions. Would you feel it?
Try hanging from a horizontal pole. Sooner or later you'll feel that your muscles are executing a force continuously | {
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"tags": "newtonian-mechanics, forces, newtonian-gravity",
"url": null
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# Assuming the existence of solutions in solving exercises
A sizeable chunk of my first calculus course at university comprised of learning techniques to evaluate limits, such as this simple example, evaluating the limit: $$\lim_{x \to 7} \frac{x^2 -8x + 7}{x-7}.$$
A typical solution would be to identify that for $$x... | {
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"lm_q1_score": 0.97112909472487,
"lm_q1q2_score": 0.8366648144906806,
"lm_q2_score": 0.86153820232079,
"openwebmath_perplexity": 180.56399256342505,
"openwebmath_score": 0.9437408447265625,
"tags":... |
There is a different viewpoint, however, which is more structural, and has a good analogy with category-theoretic foundations. Some mathematicians are uncomfortable with "extra" set theoretic baggage in the definitions of mathematical objects. For example, some dislike the fact that, in the usual definition of the natu... | {
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"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9891815513471369,
"lm_q1q2_score": 0.8155425316262888,
"lm_q2_score": 0.8244619306896955,
"openwebmath_perplexity": 135.2804125408918,
"openwebmath_score": 0.8996325135231018,
"tag... |
c, parsing
functionName = realloc(functionName, functionNameLength + 2);
functionName[functionNameLength++] = c;
functionName[functionNameLength] = '\0';
// Or better, test allocation success
char* tempFunctionName = realloc(functionName, functionNameLength + 2);
if (tempFunctionName == NULL) Handle_OutOfMemory_TBD_... | {
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"tags": "c, parsing",
"url": null
} |
c++, algorithm, mathematics, integer, time-limit-exceeded
const int A = 9; // 1 <= a <= 9
const int B = 4000+1; // 0 <= b <= 4000
const int BASE = 100000000; // 10^8
/** fill a look up table with sums of digits for a^b, result is lut[a-1][b].
*/
void fillLUT(int lut[A][B]) {
for (int a = 1; a <= A; a++) {
int d... | {
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"openwebmath_score": null,
"tags": "c++, algorithm, mathematics, integer, time-limit-exceeded",
"url": null
} |
c#, multithreading, thread-safety
Console.ReadKey();
}
static class CC
{
public static readonly List<ConsoleColor> COLORS = Enum.GetValues(typeof(ConsoleColor)).Cast<ConsoleColor>().ToList();
static CC()
{
COLORS.RemoveAt(0);
COLORS.RemoveAt(0);
}
... | {
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "c#, multithreading, thread-safety",
"url": null
} |
quantum-mechanics, homework-and-exercises, energy, wavefunction, schroedinger-equation
$$
calculating
$$
\frac{{d}E(\xi)}{{d}\xi} = \xi - \frac{3}{2}\sqrt{\frac{\pi}{2}}g\xi^{1/2} = 0 \Rightarrow \begin{cases} \xi = 0 \\ \xi = \frac{9\pi}{8}g^2 = \bar{\xi} \end{cases}
$$
The only acceptable solution is the positive on... | {
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"tags": "quantum-mechanics, homework-and-exercises, energy, wavefunction, schroedinger-equa... |
java, security, cryptography
ParametersWithIV aesCBCParams = (ParametersWithIV) pGen.generateDerivedParameters(256, 256);
cipher.init(true, aesCBCParams);
byte[] input = "Hallo ich bin ein Test".getBytes();
byte[] cipherText = new byte[cipher.getOutputSize(input.length)];
int cipherLe... | {
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"tags": "java, security, cryptography",
"url": null
} |
navigation, amcl
Title: Pose array's variance converge(navigation stack, amcl)
Hi, I'm using nav stack with my robot.
I'd like to set a final variance of a robot pose array.
I set amcl's parameters "update_min_a" and "update_min_d" to 0.0
because I'd like to have the robot estimate its pose
even if it stops.
In this ... | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "navigation, amcl",
"url": null
} |
reference-frames, acceleration, free-body-diagram, fluid-statics, buoyancy
Title: Why there is no change to the height of a cube immersed in a fluid when the container is kept in a lift going against gravity?
In a container filled with fluid (say water), and if I keep a cube (having less density than that of fluid)
a... | {
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"tags": "reference-frames, acceleration, free-body-diagram, fluid-statics, buoyancy",
"ur... |
Manipulate[ContourPlot3D[
x^2 + y^2 + z^2 +v^2+2r v z== 1, {x, -2, 2}, {y, -2, 2}, {z, -2, 2}],{v,-2,2},{r,-2,2}]
Also, for the second question, you can use something like this:
r0=0
v0=0
{x,y,z}/.FindInstance[x^2 + y^2 + z^2 +v^2+2r v z== 1/.{r->r0,v->v0},{x,y,z},Reals,10]
That 10 at the end says how many sample... | {
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"lm_q2_score": 0.8376199552262967,
"openwebmath_perplexity": 828.1034725831688,
"openwebmath_score": 0.31771719455718994,
"ta... |
• So it just needed simplified by a trigonometric identify? It all seems so simple once you know how, thank you for clearing this up – Paul Aug 24 '14 at 11:20
• @Paul: Very often, it seems that the hardest part of Calculus is the Pre-Calculus. :) – Blue Aug 24 '14 at 11:48
• Why use $\equiv$ instead of $=$ ? – Nick Au... | {
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"lm_q2_score": 0.8459424431344437,
"openwebmath_perplexity": 449.28859114418515,
"openwebmath_score": 0.998227059841156,
"tag... |
ros, xtion, image-proc
Title: How to use image_proc node
Using Xtion on Ubuntu with ROS hydro. Ran openni2_launch to the launch camera drivers.
$ rostopic list
/camera/rgb/image_raw
/camera/rgb/camera_info
and many other topics /camera/depth/.. camera/ir/..
ROS_NAMESPACE=camera rosrun image_proc
image_proc
tells ... | {
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"openwebmath_score": null,
"tags": "ros, xtion, image-proc",
"url": null
} |
molecular-biology, cell-biology, neuroscience, optics
In my personal opinion, optogenetics is a fairly specific term that is useful, though it certainly has some popular buzz around it. Neurophotonics is a new buzzword that encompasses a lot of techniques that have been around a long time, and while these techniques a... | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "molecular-biology, cell-biology, neuroscience, optics",
"url": null
} |
c++, recursion, lambda, c++20, variadic
// std::deque<std::deque<int>>
std::deque<decltype(test_deque)> test_deque2;
test_deque2.push_back(test_deque);
test_deque2.push_back(test_deque);
test_deque2.push_back(test_deque);
recursive_print(recursive_function_applier<1>(std::ranges::remove_copy_if, t... | {
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"openwebmath_score": null,
"tags": "c++, recursion, lambda, c++20, variadic",
"url": null
} |
c#, async-await
[ ... ]
private async Task FlushCacheIfNotEnoughSpace(Int32 length, CancellationToken cancel)
{
if(!FitsInBuffer(length))
{
await _socket.WriteAsync(_buffer, 0, _cursor, cancel).ConfigureAwait(false);
_cursor = 0;
}
}
[ ... ]
public... | {
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"openwebmath_score": null,
"tags": "c#, async-await",
"url": null
} |
c#, design-patterns
It seems to me that having everything in the DnsUserBlacklistService class wouldn't allow me to test thoroughly the process. I could have some internal methods being exposed to the test project with an [InternalsVisibleTo] attribute, like the hash construction, but that doesn't abstract me from the... | {
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"openwebmath_score": null,
"tags": "c#, design-patterns",
"url": null
} |
c#, error-handling, logging
Do not concatenate strings with +.
Strings are immutable. That means that you can't change a string, you can only create a new string (and the old one will be discarded.
Let's take a simple example:
"a" + "b" + "c" + "d"
These concatenations are done step by step. Look at the needed memory... | {
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python, beginner, unit-testing, pytorch
if __name__ == '__main__':
unittest.main(verbosity=2) Since you are asking about PyTorch's capabilities you are not taking advantage of, you might want to use:
torch.linspace(-10,0,300) instead of torch.tensor(np.linspace(-10,0,300))
torch.zeros(5, dtype=torch.long) instead... | {
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inorganic-chemistry, nomenclature, coordination-compounds
References
[1] S. L. Quiroga, A. E. Almaraz, V. T. Amorebieta, L. L. Perissinotti, J. A. Olabe, Chem. Eur. J. 2011, 17, 4145. DOI: 10.1002/chem.201002322
Background from Prof. Klüfers’ internet scriptum to his coordination chemistry II course. | {
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python, python-3.x, object-oriented
while not self._game.is_over():
print(self._game, end='\n')
print(f'Player: {self._current_player}')
move = self._current_player.play()
try:
self._game.move(*move)
except ValueError as err:
... | {
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"tags": "python, python-3.x, object-oriented",
"url": null
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stellar-evolution
The precision is not that great. Aside from the calibration issue there is the problem that there is a dispersion in rotation rates at a given age that leads to an uncertainty in the estimated age for a given rotation rate. This amounts to at least 10-20% for stars younger than a Gyr but probably dec... | {
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"tags": "stellar-evolution",
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filters, fft
If somebody could give me a better band pass algorithm (if that's what I need), a good formula for a carrier wave, or point out some other likely problem I would be very grateful. | {
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## show a matrix is positive definite | {
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"openwebmath_score": 0.8430898189544678,
"tags": nul... |
Science and Engineering programme. A Textbook of Engineering Mathematics by NP Bali and Manish Goyal PDF is one of the best books in Engineering Mathematics for Engineering Students. Mathematical Methods for Physics and Engineering, Third Edition is a highly acclaimed undergraduate textbook that teaches all the mathema... | {
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"lm_q1_score": 0.9833429609670702,
"lm_q1q2_score": 0.8016531365774067,
"lm_q2_score": 0.8152324960856177,
"openwebmath_perplexity": 1787.8691751599813,
"openwebmath_score": 0.46664801239967346,
... |
reinforcement-learning, reward-design, reward-functions, multi-objective-rl, reward-hypothesis
All of what we mean by goals and purposes can be well thought of as the maximization of the expected value of the cumulative sum of a received scalar signal (called reward)
The argument for a scalar reward could be that eve... | {
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This is not an answer but it greatly narrows down the class of functions $$f$$ with the described property.
1. If $$c>0$$, then the sets $$f^{-1}([c,+\infty))$$ and $$f^{-1}((c,+\infty))$$ are both open.
Indeed, every $$x$$ in any of these sets comes with an open ball of radius $$\frac{1}{f(x)}$$.
Consequently, the ... | {
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"openwebmath_score": 0.996794581413269,
"tags"... |
c++, stream, c++20
Title: Filter out comments in Delphi source code Today I am working on refactoring and documenting some ancient Delphi code. In that language, which is derived from Pascal, there are three forms of comments:
(* This is the original Pascal style comment, which is never used in my files *)
{ this is ... | {
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c++, fizzbuzz, c++17
constexpr std::pair<int, const char*> fbchart[] {
{ 3, "Fizz" }, { 5, "Buzz" }, // standard FizzBuzz
{ 7, "Boom" } // easily generalized and extended by adding to this chart!
};
game class
class Fizzer_t {
public:
using itemdef_t = std::pair<int, std::string>;
private:
std::vect... | {
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complexity-theory, optimization, np-hard, decision-problem, search-problem
Title: Are there any optimization problems in P whose decision version is hard? Normally to show that an optimization problem is hard, we show the corresponding decision version of the problem is hard. However, is this sufficient to support the... | {
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"tags": "complexity-theory, optimization, np-hard, decision-problem, search-problem",
"url": n... |
ecology, community-ecology
Title: What does a climax community lead to? Seral communities modify the environmental conditions in such a way that these are less favourable for itself and more favourable for the next community. Each community acts to end itself.
If the same is applicable to the climax community, what do... | {
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• It generates the plot but some of the table entries in ParametricPlot3D[Flatten[Table . . . ] generate no plot when I remove the table and plot them separately. For example, the first entry in the table: {r Cos[\[CurlyPhi]], r Sin[\[CurlyPhi]], 8 \[Pi]^2 + 4 \[Pi] (Im[Log[r]] + Re[\[CurlyPhi]]) + Re[PolyLog[2, E^(I \... | {
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"lm_q1_score": 0.9715639686018701,
"lm_q1q2_score": 0.8075086319576062,
"lm_q2_score": 0.8311430415844385,
"openwebmath_perplexity": 1323.8432178986288,
"openwebmath_score": 0.5490282773971558,
"ta... |
c#, powershell
Title: Task based PowerShell cmdlet I am learning about Tasks and also writing PowerShell cmdlets in C#. I found that connecting to remote machines was very slow, so I wrote this bit of code to speed it up using Tasks. I am hoping to get some feedback regarding the parallel processing and any other poin... | {
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thermodynamics
3) "And how does the refrigerent turn back to a really cool gas?"
More gas laws! if you have a high pressure liquid / gas, then suddenly drop the pressure of it, it will cool down, which is also why a deoderant can goes really cold as you use up the last of it, you have decreased the pressure, so the te... | {
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"tags": "thermodynamics",
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} |
star, light
Title: Is there a type of star that emits relatively monochromatic visible light? I was thinking about this question on Worldbuilding and the answers involving monochromatic ambient light, which got me wondering if there were any stars that emitted relative monochromatic light (a "very" narrow band, althou... | {
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"tags": "star, light",
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homework-and-exercises, kinematics, projectile
Title: Reachable area of cannonball given fixed initial speed The trajectory of a cannonball fired from the origin with initial speed $v_0$ at an angle $\theta$ is given by
$$y = x\tan\theta - \frac{g}{2v_0^2 \cos^2\theta}x^2.$$
For fixed $v_0$, at what angle $\theta$ sho... | {
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"tags": "homework-and-exercises, kinematics, projectile",
"url": null
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java, roman-numerals
//gets roman number as input and checks if it only consists of roman numerals
private static String getRoman() {
String number = "";
while(!number.matches("[IVXLCDM]+")) {
number = scanner.nextLine();
if(!number.matches("[IVXLCDM]+")) {
... | {
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qiskit, programming, ibm-q-experience
qc.append(init_gate, 0) # Perform the gate on the 0th qubit
qc.draw() # Draw the circuit (to complete your code block)
Hope this helps! | {
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java, algorithm, matrix, dynamic-programming
@Override
public int hashCode() {
return Arrays.deepHashCode(matrix);
}
@Override
public String toString() {
StringBuilder sb = new StringBuilder();
int width = getWidth();
int height = getHeight();
int maxIntegerPar... | {
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"tags": "java, algorithm, matrix, dynamic-programming",
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special-relativity
Title: Visual pictures of Lorentz transformations How can I visualize Lorentz transformations? I know it's four dimensional, but without a visual picture in my mind I can't understand any of this. For example how do:
Time reflection
Space reflection
Proper Lorentz transformations
Improper Lorentz tr... | {
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## (b) [(1+4) + (1+4) = 10 points] Copositive matrix¶
Let $\mathcal{X}$ denote the set of $n\times n$ real copositive matrices (see Lec. 3, p. 1-2).
(i) True or false: $\mathcal{X} \subset \mathbb{S}_{+}^{n}$. Explain your answer.
(ii) True or false: $\mathbb{S}_{+}^{n} \subset \mathcal{X}$. Explain your answer.
##... | {
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"openwebmath_perplexity": 546.3953806218766,
"openwebmath_score": 0.9689300060272217,
"tags": n... |
chemical-biology
Title: in which way calcium promotes cell division I have read in bio chemistry that calcium plays an important role in the cell division but the in depth information is'nt available in the textbook and I cannot memorize any fact without a supporting fact I just want to know what is its role in the pr... | {
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The First and Third Conjectures
The first conjecture of Morita was proved by Atsuji [1] and Rudin [13] in 1978. The proof in [13] is a constructive proof. The key to that solution is to define a $\kappa$-Dowker space. Suppose $X$ is a non-discrete space. Let $\kappa$ be the least cardinal of a non-discrete subspace of... | {
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"lm_q2_score": 0.8577681013541611,
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"openwebmath_score": 0.993003785610199,
"tags": ... |
braodagxj
Expert | {
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"openwebmath_score": 0.8543552160263062,
"tags": ... |
is A round body of mass M, radius R, and moment of inertia I= BMR^2 is rolling without slipping. A spherical ball of mass m and radius r rolls without slipping on a rough concave surface of large radius R. A ball is rolling clockwise (without slipping) up a ramp, slowing down. The difference between the hoop and the cy... | {
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"lm_q2_score": 0.8267117855317473,
"openwebmath_perplexity": 338.2680287069021,
"openwebmath_score": 0.5416763424873352,
"tags... |
makefile
Title: How do I simplify the following slice of a Makefile? Considering the following Makefile:
%.o: %.cpp
$(C) $(CF) -c $< -o $@
Audio/%.o: Audio/%.cpp
$(C) $(CF) -c $< -o $@
Game/%.o: Game/%.cpp
$(C) $(CF) -c $< -o $@
Generation/%.o: Generation/%.cpp
$(C) $(CF) -c $< -o $@
Input/%.o: Inp... | {
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quantum-gate, noise
Title: Is it possible to find a cNOT implementation that preserves a biased $X$ noise I am interested in qubits which are biased in noise. For my purpose I assume that I have only bit-flip (i.e. Pauli $X$) noise in my algorithm.
In the presence of such noise, quantum gates can convert this bit-flip... | {
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Notes:
• As we saw above, the elements of a set can be (virtually) anything, even other sets!
• A set can be finite in size, or infinite (we also saw this above).
• We can’t be too relaxed in what we call a set. If we try to define “the set of all sets”, we quickly run into problems, as can be discussed in the post o... | {
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"openwebmath_perplexity": 622.29657771468,
"openwebmath_score": 0.8817563056945801,
"ta... |
c++, serialization
Why is it called byte_order as a parameter and m_endian as a member? Seems a bit confusing.
Not sure I understand the logic of the default parameter here:
std::string
read_string(const std::string::size_type max_len = std::string::npos)
{
std::string str;
if (max_len == ... | {
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"tags": "c++, serialization",
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c#, datetime
Say I have a ScheduleUnit (call it Unit1) from 1:00 to 3:00 (AM)
And another Schedule Unit (call it Unit2) from 2:30 to 4:30 (AM)
The bit representation of those units are respectively
Unit1 : 001111
Unit2 : 000001111
The bitwise & comparison would result of :
001111 & 000001111 = 000001000
Meaning we h... | {
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python, beginner, datetime, tkinter
November = [
30, 31, 1, 2, 3, 4, 5,
6, 7, 8, 9, 10, 11, 12,
13, 14, 15, 16, 17, 18, 19,
20, 21, 22, 23, 24, 25, 26,
27, 28, 29, 30, 1, 2, 3,
4, 5, 6, 7, 8, 9, 10
]
December = [
27, 28, 29, 30, 1, 2, 3,
4, 5, 6, 7, 8, 9, 10,
11, 12, 13, 14, 15, ... | {
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javascript
savedSchedules[trackedSchedule] = dict;
console.log(savedSchedules);
// Add to the graph
var randomColor = Math.floor(Math.random()*16777215).toString(16); // Make color indicative of temperature
Object.entries(dict).forEach(function([key, value]) {
if (key != 'Name' && valu... | {
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homework-and-exercises, forces, rotational-dynamics, work
Similarly replacing $x$ in ......(1)
Now Integrating the the function with limits $0$ to $0$.
This results in the answer coming out as $0$.
What am I doing wrong? First, your first answer is incorrect. The magnitude of the force$^*$ is not $\sqrt 2$, so I am... | {
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newtonian-mechanics, kinematics
needs to be, but it has to point along the surface. (And you may know this, but the normal force does not balance the gravity component perpendicular to the road. You have to make sure all the forces add up to the necessary centripetal force, and that latter force has components both al... | {
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"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "newtonian-mechanics, kinematics",
"url": null
} |
navigation, ekf, gps, navsat-transform-node, robot-localization
<remap from="odometry/filtered" to="$(arg global_odom)"/>
<param name="odom0" value="$(arg wheels_odom)"/>
<rosparam param="odom0_config">
[ false, false, false,
false, false, false,
true, true, false,
fals... | {
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"id": 26828,
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"url": null
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with only one pair of parallel sides. As shown in the picture below, the parallel sides of trapezoid ABCD are called bases and the sides that are not parallel are called legs. a = 45 and b = 135 12. the midpoints of a trapezoid are joined they form a parallelogram? a. If a trapezoid is defined as a quadrilateral with a... | {
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"id": null,
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"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9783846703886661,
"lm_q1q2_score": 0.8174242790523895,
"lm_q2_score": 0.8354835309589074,
"openwebmath_perplexity": 514.5408430028579,
"openwebmath_score": 0.5867092609405518,
"... |
bioinformatics, systems-biology, biological-networks, proteomics, metabolomics
Uniformity
Transcriptomics Data: Lots of publications on pipelines, and their benchmarking available
Proteomics Data: Lack of uniformity across labs/research groups and lack of related literature lead to differences in protein fragmentatio... | {
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"tags": "bioinformatics, systems-biology, biological-networks, proteomics, metabolomics",
... |
viscosity
Here's how to solve the original differential equation:
If we multiply both sides of the differential equation by the "integrating factor" $\exp{\left(\frac{E_0t}{\eta}\right)}$, we obtain:
$$\left(\dot{\sigma+\frac{E_0}{\eta}\sigma}\right)\exp{\left(\frac{E_0t}{\eta}\right)}=\frac{d}{dt}\left(\exp{\left(\fr... | {
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"id": 49017,
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"openwebmath_score": null,
"tags": "viscosity",
"url": null
} |
physical-chemistry, acid-base, equilibrium
Attempt at solution: We have the following reactions: $$ \ce{X + H2O(l) <=> XH+ + OH-} \\ \ce{H2O(l) <=> H+ + OH-}$$
Since the percent dissociation is $4.7 \times 10^{-3}\ \%$, this enables us to find the concentration dissociated: $$ \frac{x}{0.002\ \mathrm{M}} \cdot 100 = 4... | {
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"tags": "physical-chemistry, acid-base, equilibrium",
"url": null
} |
jupiter, planetary-atmosphere, astrochemistry
As you said, there are "scads" of elements in Jupiter's atmosphere. There re countless more that are NOT in it's atmosphere. For an element to be present in an atmosphere it needs some degree of stability and some form of creation.
Jupiter is nearly 90% hydrogen. It'... | {
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"tags": "jupiter, planetary-atmosphere, astrochemistry",
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} |
Thanks in advance if you could help me with the above question!
You have a sum,
$a+(a+d)+(a+2d)+...+(a+99d)$
This is what I like to do since I hate formulas because it is better to understand than to remember the facts. So I am not going to use the sum formula (in fact I do not even know it!) instead rewrite this like ... | {
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"lm_q2_score": 0.8558511488056151,
"openwebmath_perplexity": 448.28354165478237,
"openwebmath_score": 0.8814291954040527,
... |
ros, node
The process has been blocked，so you cannot use Ctrl c to kill the node. However, it is not recommended to allow the program to work in a blocked state.You can use function selectwhen you use readto get some data in UDP or serial port process. | {
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"tags": "ros, node",
"url": null
} |
machine-learning, python, feature-selection, dimensionality-reduction
Feature selection can also be used to improve performance, if you downplay interpretability, if you are willing to monitor the model, and optimize it when it degrades.
The difference between the two is that if you choose the 2nd method, and your mod... | {
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"tags": "machine-learning, python, feature-selection, dimensionality-reduction",
"url... |
temperature, ideal-gas, atoms, kinetic-theory, molecules
Or, $\Delta V = \frac {V_0\Delta E_k}{E_0}$ — (i)
Now according to Charles law, $\Delta V = \frac {V_0\Delta t}{273}$
So, $\Delta V \propto V_0\Delta t$ — (ii)
Comparing eq. (i) and (ii),
$\Delta t \propto \frac {\Delta E_k}{E_0}$
$\therefore \Delta t \propto \f... | {
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"tags": "temperature, ideal-gas, atoms, kinetic-theory, molecules",
"url": null
} |
ros
Original comments
Comment by mgruhler on 2020-01-28:
I closed this question as it is up now. Hard to tell if it has been down 8 hours ago. If you still experience issues, feel free to reopen, but please add additional details about your setup (system, proxy, ...)
Looking at the latest traffic on the repo, I guess ... | {
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electromagnetism, momentum, conservation-laws, symmetry, frequency
Snell's Law and momentum conservation
This thread provides answers with a classical intuition of billiard ball reflection, but I want to (1) understand how to use symmetries, and why, given that the two mediums are separately invariant under continuou... | {
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"tags": "electromagnetism, momentum, conservation-laws, symmetry, frequency",
"url": null... |
2.
Now in the question "There's 9 people that want to sit on 3 chairs. How many combinations are there?" we use a similar approach.
_ _ _
For the first chair there's 9 possible people that can sit down. For the second theres 8 and for the third theres 7, So it ends up being $\frac{9\cdot8\cdot7}{3!}$
The problem/q... | {
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"lm_q1q2_score": 0.8094847181145937,
"lm_q2_score": 0.837619959279793,
"openwebmath_perplexity": 253.88395469838582,
"openwebmath_score": 0.7098986506462097,
"tag... |
electromagnetism, waves, geophysics, elasticity
Title: Utility of displacements potentials in geophysics In the elasticity theory, you can derive a wave equation from the fundamental equation of motion for an elastic linear homogeneous isotropic medium:
$\rho \partial^2_t \overline{u} = \mu \nabla^2 \overline{u} + (\m... | {
"domain": "physics.stackexchange",
"id": 111,
"lm_label": null,
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"openwebmath_score": null,
"tags": "electromagnetism, waves, geophysics, elasticity",
"url": null
} |
can not pass through the circle circumference! Point it meets the circle 2 + 2 = 0 the following is. You are usually given the point of tangency point the tangent intersects circle! The radius at the tangency point, we need to find its equation m '', have. By an equation in the circle or runs parallel to the radius ( )... | {
"domain": "brinleysgrading.com",
"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9693241982893258,
"lm_q1q2_score": 0.8386826452376333,
"lm_q2_score": 0.8652240877899776,
"openwebmath_perplexity": 603.4458171108644,
"openwebmath_score": 0.6139950156211853,
"t... |
special-relativity
$$\boxed{x^2 - (ct)^2 = 1^2}$$
I draw above hyperbola together with the one below and i get image below:
$$\boxed{x^2 - (ct)^2 = 2^2}$$
In the image i marked what i think is invariant quantity of relativity (but i am not sure) $\Delta s$, because from boxed equations i can clearly see universal ... | {
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"tags": "special-relativity",
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} |
c
sm_stack.height -= 1;
size_t new_size = sm_stack.height * sizeof(*sm_stack.stack);
sm_data.scenes[id].terminate(data);
safe_dealloc((void **) &sm_stack.stack, new_size);
}
void terminate_scene_manager(void)
{
if (sm_data.initialized == false)
{
fputs("Warning: attempt to terminate "
... | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "c",
"url": null
} |
thermodynamics, entropy
In the case of oil and water, it is energetically favorable for the oil to be separate from the water, because these molecules bind more strongly to themselves than to each other. The extra energy released is now available to thermal motion of the oil and water molecules, or to the surrounding ... | {
"domain": "physics.stackexchange",
"id": 50729,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "thermodynamics, entropy",
"url": null
} |
general-relativity, special-relativity, cosmology, metric-tensor
Well yes, in general you cannot create spacelike hypersurfaces in GR that would have the same nice interpretations as in SR. But you can construct some "random" spacelike hypersurface in GR, that has no nice physical significance. It is just some submani... | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "general-relativity, special-relativity, cosmology, metric-tensor",
"url": null
} |
ros
*generated with looping and reading each 2 hex to integer data with PointCloud2.fields:
name:"x",offset:0,count:1,datatype:7
name:"y",offset:1,count:1,datatype:7
name:"z",offset:2,count:1,datatype:7
Assuming every offset in iteration reading XYZ points.
The PointCloud2 data is not rendering in RViz with the same ... | {
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"tags": "ros",
"url": null
} |
c++, hash-map
class Dic{
public:
Dic( ); //an empty Dic
//The BIG 3: operator=, copyconstructor, destructor
~Dic();
Dic( const Dic & src ); //copy con
Dic & operator=( const Dic & rhs ); //assignment op
//return null or a pointer at the value in this Dic
V * find(K key);
//retu... | {
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"url": null
} |
from when you studied exponents. Scientific notations. Simplifying Expressions with Exponents, Further Examples (2.1) a) Simplify 3a 2 b 4 × 2ab 2. Simplifying Algebraic Expressions With Parentheses & Variables - Combining Like Terms - Algebra - Duration: 32:28. Multiplying negative exponents; Multiplying fractions wit... | {
"domain": "karval.gr",
"id": null,
"lm_label": "1. Yes\n2. Yes\n\n",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9664104972521578,
"lm_q1q2_score": 0.8480027893551685,
"lm_q2_score": 0.8774767986961403,
"openwebmath_perplexity": 897.3339865643346,
"openwebmath_score": 0.8905116319656372,
"tags": ... |
measure of linear association Spearman ’ s just not linear the dependent variables the... Strength and direction of a multivariable data set is proposed the greek letter eta ) very weak relation! ( statistical dependence of ranking between two variables move from low to or... Will obtain measure of a relationship betwe... | {
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"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9790357567351325,
"lm_q1q2_score": 0.8179682569878084,
"lm_q2_score": 0.8354835371034368,
"openwebmath_perplexity": 724.2598402608036,
"openwebmath_score": 0.6706416606903076,
"tags"... |
programming-challenge, haskell
We can simplify parseOrbit therefore to
parseOrbit :: String -> Orbit
parseOrbit s = let (a, _:b) = break (==')') s in (a, b)
However, you seem to prefer where, so let's use a where clause instead:
parseOrbit :: String -> Orbit
parseOrbit s = (a, b)
where (a, _:b) = break (==')') s
... | {
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"url": null
} |
The three perpendicular distance to sides of a scalene triangle are $(x,y, 4 x/5 + 3 y/5) ,$
totaling to $\dfrac {9 x + 8 y} {5}$ which is variable , needing to be averaged.
If it were constant, a result like those from Viviani, Fermat would have been in existence now for more than two centuries. | {
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"lm_q2_score": 0.8757869851639066,
"openwebmath_perplexity": 200.4809339040535,
"openwebmath_score": 0.9231142401695251,
"tag... |
ros-melodic, catkin, debian, bloom-release
that would surely result.
So: do you recall how you "cleared out LDFLAGS in the current
deb-building system"? I'd like to do the same in the new system.
We'll do our best to address this properly in the next release cycle,
starting early. | {
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} |
## What is mean by non-decreasing order?
Nondecreasing order simply refers to the idea of sorting things where subsequent items are greater than, or equal to the previous item. This is different to increasing order because in an increasing ordered list, each item is greater than the previous one.
## What is non-decre... | {
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"lm_q1_score": 0.9814534349454033,
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"lm_q2_score": 0.8221891283434876,
"openwebmath_perplexity": 580.5350384796975,
"openwebmath_score": 0.8924967646598816,
"tags... |
c#, interview-questions, rational-numbers, factors
var positiveNumerator = Math.Abs(numerator);
var positiveDenominator = Math.Abs(denominator);
var gcd = CalculateGreatestCommonDenominator(positiveNumerator, positiveDenominator);
int semiFinalNumerator = positiveNumerator / gcd;
int finalNumerator =... | {
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"tags": "c#, interview-questions, rational-numbers, factors",
"url": null
} |
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