text stringlengths 1 1.11k | source dict |
|---|---|
python, python-3.x, file-system, posix
raise ValueError('File mode must be between {} and {}.'.format(
oct(MIN_MODE), oct(MAX_MODE)))
def __int__(self):
"""Returns the integer value of the file mode."""
return (int(self.user) << 6) + (int(self.group) << 3) + int(self.other)
def __... | {
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"tags": "python, python-3.x, file-system, posix",
"url": null
} |
json, swift, cocoa, swift3
cell.imageCell.image = UIImage(data: imageData)
Don't force unwrap.
You should not force unwrap your Optionals but use safe unwrapping instead, with if let or guard let.
A classic solution in your case is to have a ready-made placeholder image in your project - that way, if the download of ... | {
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"tags": "json, swift, cocoa, swift3",
"url": null
} |
geography, reference-request
Metadata files attached to images are often filled with useful information. Usual relevant information for a technical or scientific paper are the moment of acquisition, the scale, the bands, the name of the sensor, maybe the series of the product, maybe there is a serial number too, possi... | {
"domain": "earthscience.stackexchange",
"id": 690,
"lm_label": null,
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"lm_q1q2_score": null,
"lm_q2_score": null,
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"openwebmath_score": null,
"tags": "geography, reference-request",
"url": null
} |
particle-physics, research-level, cp-violation
But in recent versions they have also added some remarks about how the calculations from the MILC and RBC collaborations show that this mass is no zero.
So, does it still survive some argument for $m_u=0$? And, by the way, does the strong CP problem request exactly 0, or ... | {
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"tags": "particle-physics, research-level, cp-violation",
"url": null
} |
c#, web-services, wcf
namespace .Example.DAL.Interfaces
{
public interface IExampleDAO
{
ExampleApiResponse<ExampleDataResponse> GetExampleDataInfo(string authenticationToken, int targetId,
DateTime? dateFrom, DateTime? dateTo, string apiUrlv2);
}
} You've turned your IoC container into... | {
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"openwebmath_score": null,
"tags": "c#, web-services, wcf",
"url": null
} |
c, programming-challenge
int main()
{
char number[] = "73167176531330624919225119674426574742355349194934"
"96983520312774506326239578318016984801869478851843"
"85861560789112949495459501737958331952853208805511"
"12540698747158523863050715693290963295227... | {
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"openwebmath_score": null,
"tags": "c, programming-challenge",
"url": null
} |
The sum of each row of the matrix is $q+2p$ and therefore $(1,1,1)$ is an eigenvector corresponding to the eigenvalue $q+2p$. Now to compute the remaining eigenvectors, these for a basis of th null space of$$A-(q-p)\operatorname{Id}=\begin{pmatrix}p&p&p\\p&p&p\\p&p&p\end{pmatrix}.$$So, take $(1,-1,0)$ and $(0,1,-1)$. | {
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"lm_q1q2_score": 0.8075663223865612,
"lm_q2_score": 0.817574478416099,
"openwebmath_perplexity": 245.5154106221293,
"openwebmath_score": 0.9535348415374756,
"tags... |
quantum-mechanics, topological-field-theory, topological-insulators
Title: What is topological quantum matter? (Answer to which was given by TED-Ed) What is topological quantum matter? Today I saw the answer to this question in a video by TED-Ed on YouTube. But I couldn't make any sense of it (for I am still in high-s... | {
"domain": "physics.stackexchange",
"id": 44139,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "quantum-mechanics, topological-field-theory, topological-insulators",
"url": nul... |
orbit, gravity, natural-satellites
From http://en.wikipedia.org/wiki/File:Hill_sphere_of_the_planets.png
I found it interesting that variation of Hill sphere is intuitive for the first five planets, as the variation is similar to variation of mass/radius of those planets. Mercury has the smallest Hill sphere, Venus/E... | {
"domain": "astronomy.stackexchange",
"id": 516,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
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"openwebmath_score": null,
"tags": "orbit, gravity, natural-satellites",
"url": null
} |
organic-chemistry, reaction-mechanism, synthesis, carbonyl-compounds, hydrocarbons
C to the final product is pretty direct, the carboxylic acid group converts to acyl halide which undergoes nucleophilic addition by the ammonia derviative. | {
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"tags": "organic-chemistry, reaction-mechanism, synthesis, carbonyl-compounds, hydrocarbo... |
newtonian-gravity, angular-momentum, orbital-motion, conservation-laws, celestial-mechanics
Title: What is the ultimate "goal" of two particles in a gravitational field?
What is the ultimate "goal" of two particles in a gravitational field?
Will the particles eventually occupy the same point at the same time if nothi... | {
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"tags": "newtonian-gravity, angular-momentum, orbital-motion, conservation-laws, celestial-... |
fft, power-spectral-density
The matlab code below generates the signal and the graphs.
clear
home
close all
signal_multiplier = 3;
noise_bits =8;
signal_bits = 11;
fs = 1;
T = 1/fs;
t = 1:T:(2^signal_bits)-T;
noise_vec2 = randi([-(2^noise_bits) 2^noise_bits],1,length(t));
signal = signal_multiplier*t + noise_vec2;... | {
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"id": 8439,
"lm_label": null,
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"lm_q2_score": null,
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"openwebmath_score": null,
"tags": "fft, power-spectral-density",
"url": null
} |
c++, c++11, pointers
See What is the copy-and-swap idiom?
Move Assignment
Looks good. But like the move constructor, The move assignment should be marked as noexcept.
DeepPtr& operator=( DeepPtr&& other )
{
swap( *this, other );
return *this;
}
Swap
static void swap( DeepPtr& left, Dee... | {
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"tags": "c++, c++11, pointers",
"url": null
} |
thermodynamics, solar-system, atmospheric-science, climate-science, meteorology
To better clarify my thinking, imagine this: if we take Venus and place it out of the Solar system where its exposure to solar radiation would be negligible, I think we can agree that its temperature would decrease drastically. Now, I know... | {
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"tags": "thermodynamics, solar-system, atmospheric-science, climate-science, meteorology",
... |
thermodynamics, pressure
Title: Why is pressure an intensive property? My teacher explained to me that we volume is an extensive property because it is additive in nature. But he also told us that pressure is an intensive property. Now according to the gas law equation $PV=nRT$, pressure is dependent on volume. Increa... | {
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"id": 26328,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "thermodynamics, pressure",
"url": null
} |
np-complete, np
Title: Why is Steiner Tree trivially in NP? I'm learning about NP-completeness, and many reduction proofs start off by stating that a problem is triviallyin NP. But I can't seem to wrap my head around this.
Why is this so? What is normally meant in cases like this is
there is a simple, obvious algor... | {
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"tags": "np-complete, np",
"url": null
} |
inorganic-chemistry, stability
$[5]$ Κ. V. Astakhov, A. G. Elitsur, K. M. Nickoluev. Zhurnal obshcheĭ khimii, ($1951$), 21, 1753.
$[6]$ A. G. Massey, N. R. Thompson, B. F. G. Johnson, R. Davis. ($1973$). The Chemistry of Copper, Silver, Gold. (1975 reprint)
$[7]$ O. Diaz-Morales, F. Calle-Vallejo, C. de Munck, M. T. M... | {
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"id": 7448,
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"tags": "inorganic-chemistry, stability",
"url": null
} |
python, python-3.x, graph
def __str__(self):
"""
Displays the graph in this FORMAT: (adjacency list)
node1 -> connected_nodes
node2 -> node1 node3 node4
"""
arr = list()
for node, connected_nodes in self.graph.items():
arr.append(f"{node} ---> {' '.j... | {
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"url": null
} |
Update: Apparently I forgot to shed some light on the second question asked by OP namely any references/books on the theory of Jacobi Elliptic and Theta functions. This I deal with now.
The theory of Elliptic functions and theta functions is a very fascinating one. My own sources of study in this field are the followi... | {
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"lm_q1_score": 0.9820137931962463,
"lm_q1q2_score": 0.8005695425928704,
"lm_q2_score": 0.8152324826183822,
"openwebmath_perplexity": 536.8295533283593,
"openwebmath_score": 0.9616298675537109,
"tag... |
performance, validation, r
"10:30:00", "10:50:00", "11:15:00", "12:50:00", "14:00:00", "14:20:00",
"14:40:00", "15:00:00", "16:00:00", "16:45:00", "00:00:00", "00:30:00",
... | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "performance, validation, r",
"url": null
} |
quantum-mechanics, waves, wavefunction, wavelength, semiclassical
Is there a system in classical mechanics that behave very similar to the quantum potential well? I want to find a classical system that also has levels of $\propto n^2$? In the classical case, the energies are related to the eigenvalues of the square ... | {
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"tags": "quantum-mechanics, waves, wavefunction, wavelength, semiclassical",
"url": null
... |
opencv, ros-groovy, ubuntu-precise, ubuntu
Title: Groovy and OpenCV: Linker errors
Hi! I'm trying to compile a ROS package in Ubuntu 12.04 64bit which has been used in Fuerte and uses OpenCV. As recommended on the opencv2 ROS Wiki page (http://www.ros.org/wiki/opencv2), I would like to change the way of including Ope... | {
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"id": 12970,
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"tags": "opencv, ros-groovy, ubuntu-precise, ubuntu",
"url": null
} |
ros, pcl, build-from-source, source, pcl-ros
Title: Fuerte PCL/Flann Repo github.com/wg-debs no longer exist. Where was the source moved to?
Hi Everyone,
It has come to my attention that the "github.com/wg-debs" no longer exists. This has been for some time the place where I pulled down the source for the packages i... | {
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"tags": "ros, pcl, build-from-source, source, pcl-ros",
"url": null
} |
tensor-calculus, differentiation, covariance
For each upper index $\alpha_i$, add a term $\Gamma^{\alpha_i}_{\sigma\gamma} T^{\alpha_1\cdots\alpha_{i-1}\sigma\alpha{i+1}\cdots\alpha_r}{}_{\beta_1\cdots\beta_r}$.
For each lower index $\beta_j$, subtract a term $\Gamma^\sigma_{\beta_j\gamma} T^{\alpha_1\cdots\alpha_r}{}... | {
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"id": 7814,
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"lm_name": null,
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"tags": "tensor-calculus, differentiation, covariance",
"url": null
} |
astrophysics, space-time, redshift, magnetic-field
A GR example is an uncharged black hole (possible in theory, but unlikely in reality – any black hole will have a bit of charge, just by chance). A clock (our bunch of Z0 bosons for example) close to the black hole will seem to run slower according to a distant observ... | {
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"id": 3808,
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"tags": "astrophysics, space-time, redshift, magnetic-field",
"url": null
} |
python, game-of-life
:param self.screen: the screen used by pygame.
:param self.white: color for pygame. alive plebs
:param self.black: color for pygame. dead plebs or "empty" area
:param self.width: screen width
:param self.size: size of a pleb.
:param self.alive: alive plebs.... | {
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"tags": "python, game-of-life",
"url": null
} |
acoustics, material-science, physical-chemistry, oceanography
Sound attenuation in the low-frequency range is primarily due to boric acid relaxation and is a function of the seawater pH.
(my emphasis)
Whether that effect is actually big enough to deafen dolphins is a matter of some debate. | {
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"tags": "acoustics, material-science, physical-chemistry, oceanography",
"url": null
} |
algorithms, formal-languages, software-verification
Edit: Here is how you would formally define the semantics, which in the simplified case are a partial mapping from a sequence of operations to a sequence of numbers (the stack). It is only partial since sometimes arguments might be missing.
The function $F$ is define... | {
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"tags": "algorithms, formal-languages, software-verification",
"url": null
} |
general-relativity, black-holes, equivalence-principle
The infinitesimal flat patch in which you're allowed to play with the EP does not include ... anything beyond the horizon ...
I don't see how a test of the EP would be invalidated due to the equipment straddling the horizon. The answer is yes. To Willie Wong's "n... | {
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"id": 975,
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"tags": "general-relativity, black-holes, equivalence-principle",
"url": null
} |
python
# Print the map
for row in maze_map:
for tick in row:
if tick: output('X'),
else: output('.'),
output('\n')
It gives a maze like this:
XXXXXXXXXXXXXXXXXXXXX
X.......X...X.X.X...X
XXX.XXXXXXX.X.X.X.XXX
X.X...............X.X
X.XXXXXXXXX.XXXXX.X.X
X...X...X.X.X.......X
X.XXXXX.X.X.XXXXXXX... | {
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"tags": "python",
"url": null
} |
Icd-10 Code For Personal History Of Sexually Transmitted Disease, My Hero Academia Fanfiction Izuku Blamed, Kmdc Admission 2020, Flathead County, Montana Property Search, Snk Arcade Classics Steam, Myholidays Contact South Africa, Custer County Ne Courthouse, Washu Mstp Stipend, Pat Maths Test 9 Answers, | {
"domain": "fanthai.com",
"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9752018376422666,
"lm_q1q2_score": 0.822968054788499,
"lm_q2_score": 0.8438951025545426,
"openwebmath_perplexity": 684.4689505701622,
"openwebmath_score": 0.7975123524665833,
"tags": nul... |
inorganic-chemistry, quantum-chemistry, solutions
Secondly, if you do not understand this, there is no reason to go digging into quantum chemistry. That is a game best left alone untill you are good and ready.
The most reasonable way to understand this is through understanding energy and thermodynamics. Most substance... | {
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"tags": "inorganic-chemistry, quantum-chemistry, solutions",
"url": null
} |
javascript, assembly
else
machineCode[address].hex +=
node.children[2].getRegisterNumber(context.namedRegisters) + "0";
address++;
} else if (/^store$/i.test(node.text)) {
check_if_there_are_three_child_nodes_and_the_second_one_is_comma();
if (node.children[0].getRegisterNumbe... | {
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "javascript, assembly",
"url": null
} |
cosmology, space-expansion, big-bang, hawking-radiation
Title: Could the matter for a Big Bang come from the Hawking radiation of a super fast expanding universe? If I understand it right, the universe will at some point in time expand so fast, that from any particular point in space, an observer will see an event hor... | {
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"id": 79645,
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"openwebmath_score": null,
"tags": "cosmology, space-expansion, big-bang, hawking-radiation",
"url": null
} |
combinatorics, permutations
Then there is the small number of cases when the circuit is closed, which one can analyse to count all their starting element variants as the same circuit.
Note that when the track does not cross itself, each closed shape comes in two variants: clockwise and counter-clockwise. But should I ... | {
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"id": 4285,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "combinatorics, permutations",
"url": null
} |
javascript
Title: Using multiple popup windows with bPopup I'm using a lightweight jQuery popup plugin called 'bPopup'. I'm using it on my website at the moment to load multiple popup windows when clicked. I was recently told that my code was inefficient as I was loading multiple popups with multiple JavaScript 'liste... | {
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"lm_name": null,
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"lm_q2_score": null,
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"openwebmath_score": null,
"tags": "javascript",
"url": null
} |
c#
}
if (sender == "Accept")
{
Panel1.Visible = false;
Panel2.Visible = false;
Panel3.Visible = true;
SerialBox.Enabled = false;
}
if (sender == "Return")
{
Panel1.Visible = true;
Panel2.Visible = false;
... | {
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"tags": "c#",
"url": null
} |
data-formats, hierarchical-data-format
The text file format options are XML/JSON/CSV. They are cross-platform/language/toolkit, and are a good archival format due to the ability to be self-describing (or obvious :). If uncompressed, they are huge (10x-100x HDF), but if compressed, they can be fairly space-efficient ... | {
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"tags": "data-formats, hierarchical-data-format",
"url": null
} |
star, galaxy, orbital-mechanics, star-formation
How close would the two stars have originally been to have such different orbital periods? The rotation curve of the Milky Way is quite flat in the vicinity of the Sun. That means that the average velocity tangential to the Galactic centre is constant.
If we assume one s... | {
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"url": null
} |
python, datetime, calculator
Also, one could consider keeping it even more simple and use the fact that:
return number_of_days / days_in_year[planet]
will throw the relevant exception for an invalid value.
Do not repeat yourself
You can try to avoid duplicated values and have a single source of information. In your c... | {
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- PermutationAlgorithm. Enter The String : abcdef Enter The Number Of Places To. and implementation Next add tests for other invalid parameters starting with empty list. - [Voiceover] Permutations are like when we have a problem…that asks us something like "How many ways…"can five people sit in five chairs?"…Okay so le... | {
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"openwebmath_score": 0.568350076675415,
"tags": null... |
cosx are even functions while x, x. Fourier series Generalizations Applications 2L-periodic functions Even and odd functions Complex form 3. In the following, properties involving derivatives, Fourier series, Taylor series, and so on suppose that these concepts are defined of the functions that are considered. 5 1 Sinu... | {
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"lm_q1q2_score": 0.8091503248048043,
"lm_q2_score": 0.8152324826183822,
"openwebmath_perplexity": 514.1941983617381,
"openwebmath_score": 0.9046310782432556,
"t... |
quantum-field-theory, particle-physics, mass, renormalization
Now, this shouldn't come as such a surprise since there are new particles awaiting discovery just behind the corner, so claiming that we have a complete theory would be preposterous. Instead, what we claim is that we have a good theory that works upto some ... | {
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"tags": "quantum-field-theory, particle-physics, mass, renormalization",
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} |
java, balanced-delimiters
if (code.charAt(current) == ']') {
count--;
if (count == 0) {
break;
}
} else if (code.charAt(current) == '[') {
count++;
}
}
} else {
do {
current--;
if (code.charAt(current) == '[') {
... | {
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"tags": "java, balanced-delimiters",
"url": null
} |
c, strings, memory-management, beginner
This was just a learning example, which I have never really used. In practice, I'd suggest working with a larger s (char s[1025], %1024[^\n] in scanf, and len - old_len == 1024 in the condition of the do...while loop) to reduce the number of realloc calls which can be very slow ... | {
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"tags": "c, strings, memory-management, beginner",
"url": null
} |
energy, spacetime, matter
$G\mu\nu$ = 8$\pi T\mu\nu$
See the whole treatment in Wikipedia at https://en.m.wikipedia.org/wiki/Einstein_field_equations
where G is the Einstein tensor that is constructed from spacetime metric elements and up to second space and time derivatives, and T is the matter-energy stress energy t... | {
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"tags": "energy, spacetime, matter",
"url": null
} |
The difference of two consecutive perfect squares is always odd
I am working on another homework assignment about proofs. The question is:
Prove or find counterexample: the difference of two consecutive perfect squares is odd?
There is no counterexample correct? I am thinking this is always true. If I were to do 7^2... | {
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"tag... |
loop-invariants
The loop will terminate when n is odd. If n = 1, true is returned and that means that n0 was a power of 2. Otherwise it's false.
I'm new at this and struggle with the proving the power of 2 part for before and during iterations and after the loop terminates. Also what does a loop invariant look like fo... | {
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3.2.1: Set Complement | {
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"tags":... |
Now, what's special about the numbers $\frac n{1001}$ (again, apart from the ones which are already integers) is that they are the only numbers which are not integers, but multiplying them by $1001$ makes them integers. If we use the above interpretation of multiplying by $1001$, the only way that can happen is if afte... | {
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"lm_q1_score": 0.9793540710685614,
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"lm_q2_score": 0.8244619306896955,
"openwebmath_perplexity": 173.78513594495305,
"openwebmath_score": 0.8578642010688782,
"ta... |
ros, opencv, tum-ardrone
/usr/bin/ld: skipping incompatible /usr/local/lib/libopencv_photo.so when searching for -lopencv_photo
/usr/bin/ld: cannot find -lopencv_photo
/usr/bin/ld: skipping incompatible /opt/ros/fuerte/lib/libopencv_stitching.so when searching for -lopencv_stitching
/usr/bin/ld: skipping incompatible ... | {
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"tags": "ros, opencv, tum-ardrone",
"url": null
} |
quantum-field-theory, operators, mathematics, dirac-delta-distributions, trace
What all this really means is that even if you are working in a space where some of these traces would diverge, the results of calculations for physical quantities that one would for instance get from measurements would always be finite. Th... | {
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"tags": "quantum-field-theory, operators, mathematics, dirac-delta-distributions, trace",
... |
haskell, monads
Title: Haskell - saving content of HTTP request in selected file As a Haskell beginner I'm currently playing around the IO monad and prepared simple program which gets from the user two information:
URL (http)
Output file path
Then it performs GET request to the provided URL and stores the result in ... | {
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"openwebmath_score": null,
"tags": "haskell, monads",
"url": null
} |
thermodynamics, ideal-gas, kinetic-theory
Title: Mercury In a J tube This is a doubt on question 5.3 from the 5th chapter of the book Heat and Thermodynamics by Zemansky and Dittman. The problem statement is as follows:
Mercury is poured into the open end of a j-shaped tube, closed at the short end, trapping air in th... | {
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"tags": "thermodynamics, ideal-gas, kinetic-theory",
"url": null
} |
java, android, gson
//Events Request
client.newCall(eventsrequest).enqueue(new Callback() {
@Override
public void onFailure(Call call, IOException e) {
error.set(true);
latch.countDown();
... | {
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "java, android, gson",
"url": null
} |
thermodynamics
Title: Energy Balance Equation from a steam turbine Let's say a steam turbine produces Wt. If the energy of the steam flow entering the turbine is equal to E3, and the energy of the steam flow leaving the turbine is E4, and there is an energy loss of dEf, there is also an energy loss of dq.
Are dEf and ... | {
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"tags": "thermodynamics",
"url": null
} |
ruby, ruby-on-rails, meta-programming
I try to place custom validations in a separate file (in config\initializers\ directory).
ActiveRecord::Base.class_eval do
def self.validates_dependent_fields(*attr_names)
fields_count = 0
attr_names.each{ |attribute| fields_count += 1 if record[attribute] } | {
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"openwebmath_score": null,
"tags": "ruby, ruby-on-rails, meta-programming",
"url": null
} |
c++, collections, c++14, variant-type
template <std::size_t Tsize, std::size_t Talign>
template <class T>
TypeEraser<Tsize, Talign>::TypeEraser(T*)
: _deleter([](char *s) {
reinterpret_cast<T*>(s)->~T(); // (4)
})
, _mover([](TypeEraser &self, TypeEraser &&other) {
new (sel... | {
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"tags": "c++, collections, c++14, variant-type",
"url": null
} |
nucleophilic-substitution, elimination
The key here is to look at what controls reactivity in $S_{N}2$ and $S_{N}1$ reactions.
The former is concerted where the bond breaking and bond forming take place at the same time. Therefore, the strength of the nucleophile is important as is the propensity of the leaving group ... | {
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"tags": "nucleophilic-substitution, elimination",
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Let X be the number of coin flips required until a head is obtained. So, we need to calculate E(X) (i.e. expected value of X).
We can condition E(X) on whatever our first flip is. Let E(X|H) denote the number of remaining coin flips given I got a head on the first flip. Similarly, let E(X|T) denote the number of remai... | {
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"lm_q2_score": 0.8175744828610094,
"openwebmath_perplexity": 415.7433615825692,
"openwebmath_score": 0.7913362979888916,
"tag... |
quantum-mechanics, double-slit-experiment
Title: Trying to understand quantum physics double slit experiment I have watched many videos and read many articles and it says that a particle is acting like a wave. So why we try to understand on which hole the particle went through?
Clearly a wave will pass in both slits... | {
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# Explain why $q_3$ is well-defined unless u lies in the span of $q_1$ and $q_2$. | {
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"openwebmath_perplexity": 56.329992529833156,
"openwebmath_score": 0.9918704628944397,
"ta... |
c++, performance, regex
if (!is_dominated) {
new_covers[r] = get(covers,r);
}
}
return new_covers;
}
With this fixed, the C++ version runs about 3 times faster than the Python version on my system using g++ -O2. | {
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"tags": "c++, performance, regex",
"url": null
} |
# Factoring square roots
#### NeedingWD40
##### New member
I know that one can factor square roots, such as √8 = √(4x2) = √4 x √2 = 2√2 but I don't understand why.
we are saying a1/2.b1/2 = (ab)1/2 which doesn't feel intuitive....
can someone help explain?
#### Subhotosh Khan
##### Super Moderator
Staff member
I ... | {
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"openwebmath_perplexity": 811.0912754789939,
"openwebmath_score": 0.7542734742164612,
"tags... |
homework-and-exercises, wavefunction, integration
Title: Expectation value $\bigg\langle \frac{1}{|\mathbf r_1-\mathbf r_2|} \bigg\rangle$ for the ground-state of He atom The approximate ground state for the two electrons of the He atom is given by $$\psi_0(r_1,r_2) = \frac{8}{\pi a^3}e^{-2(r_1+r_2)/a}$$, where $a$ is... | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "homework-and-exercises, wavefunction, integration",
"url": null
} |
object-oriented, game, c++17, cmake
Speaking of colour:
enum Color { EMPTY, BLACK, WHITE }; | {
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quantum-gate, unitarity, foundations
Your example, however, leads to a deterministic non-unitary gate by applying a conditional bit-flip instruction based on the measurement outcome. This is an example of classical feedforward, whereby a mid-circuit measurement determines which quantum gate one implements subsequently... | {
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"tags": "quantum-gate, unitarity, foundations",
"url": null
} |
php, pdo
/**
* Delete's a row from the database.
*
* @param string $table Name of the table into which the row has to be deleted
* @param array $where All the conditions have to be passed as a array
* @param array $params For binding the values in the where clause
* @exception $ex... | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "php, pdo",
"url": null
} |
virology, mutations, coronavirus
Among all those viruses which continue successfully infecting throughout the course of a year, on average we observe 24 substitution mutations in the genome over the course of that year. Every transmission chain included in the group of viruses at the end of the year must have remained... | {
"domain": "biology.stackexchange",
"id": 10398,
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"openwebmath_score": null,
"tags": "virology, mutations, coronavirus",
"url": null
} |
close normality. Detecting all kinds of departure from normality will lead to incorrect p-values in the next minute a PhD Chemical! Is also plotted to help you simplify data collection and analysis using R. Automate all the points approximately. Terms of service, privacy policy and cookie policy that to improve normali... | {
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"lm_q1_score": 0.9449947117065458,
"lm_q1q2_score": 0.8159005005744241,
"lm_q2_score": 0.8633916047011594,
"openwebmath_perplexity": 1563.9871741379889,
"openwebmath_score": 0.4371911287307739,
"tags": null,
... |
ros, actuator
Title: What's a good stepper motor to use with ROS?
I'm looking for a stepper motor w/encoder that works with ROS. Does anyone know of a good one that has documentation about how to use it with ROS?
Thanks in advance.
Originally posted by CodeMade on ROS Answers with karma: 21 on 2018-01-10
Post score:... | {
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"tags": "ros, actuator",
"url": null
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Now, in case (1), we find that $(a,b)$ are smaller than $(T,U),$ but $T \geq 3, a > 1,$ and $a^2 - pq b^2 = 1.$ This is a contradiction, as our hypothesis is that $(T,U)$ is minimal.
In case $(2),$ we have $$p a^2 - q b^2 = 1.$$ $$p a^2 \equiv 1 \pmod q,$$ so $a$ is nonzero mod $q,$ then $$p \equiv \left( \frac{1}{a} ... | {
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"lm_q1q2_score": 0.8032192972807384,
"lm_q2_score": 0.8128673155708975,
"openwebmath_perplexity": 106.73528091592996,
"openwebmath_score": 0.8168806433677673,
"ta... |
c++, csv, pointers
Title: Inventorizing the universe I recently started re-factoring a project I hadn't touched in many months.
The original purpose was to be an inventory management system for a game I played, Ogame. In this game you play inside a universe filled with galaxies, which are filled with systems, which ar... | {
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ros, transform, tf2
Originally posted by lucasw with karma: 8729 on 2021-09-26
This answer was ACCEPTED on the original site
Post score: 4
Original comments
Comment by labude on 2022-05-31:
I can confirm that this works.
Comment by raabuchanan on 2023-02-08:
Thank you! This worked like a charm. Ideally there would be... | {
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electromagnetic-radiation, quantum-electrodynamics, antimatter
Especially, does the charge and by this the fields vanish instantaneous or during some time period? The same for the mass.
Again this is a quantum mechanical interaction controlled by quantum mechanical probabilities that can be calculated using QED. Ther... | {
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return (0LL << bit) + find_nth(k - 0, bit - 1, cnt + 0); } ll find_pos(ll x, int bit = bitlim, int cnt = 0) { if (bit < 0) return 0; ll v = calculate(bit - 1, cnt + 0); if (x >> bit & 1) return v + find_pos(x, bit - 1, cnt + 1); else return 0 + find_pos(x, bit - 1, cnt + 0); } ll query(ll x, ll k) { f.assign(bitlim + 1... | {
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"openwebmath_score": 0.4295719265937805,
"tags": ... |
python, python-3.x, numpy, coordinate-system, geospatial
# Not necessary:
azimuth = np.mod(azimuth, TWO_PI)
# tan U1 = (1−f) · tan φ1
tan_u1 = (1 - F) * np.tan(latitude)
# cos U1 = 1 / √1 + tan² U1, sin U1 = tan U1 · cos U1
cos_u1 = np.arctan(tan_u1)
# σ1 = atan(tan U1 / cos α1)
sigma1 = n... | {
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signs of the adjacency matrix. Thus, you can represent a huge sized 10000 x 10000 matrix with a couple of lists or so containing the coordinates where the 1's are. If a graph has n n n vertices, its adjacency matrix is an n × n n \times n n × n matrix, where each entry represents the number of edges from one vertex to ... | {
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"lm_q1q2_score": 0.8204709305772484,
"lm_q2_score": 0.8333245891029457,
"openwebmath_perplexity": 1078.7558530364001,
"openwebmath_score": 0.3325174152851105,
... |
reproduction
Excerpts from the references that lead to the short answer above:
In the developing female fetus, oogonia become primary oocytes that begin the first division of meiosis. However, this division is not completed and the primary oocytes remain “frozen” in the prophase stage of the first meiotic division.
A... | {
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"tags": "reproduction",
"url": null
} |
lowpass-filter, modulation, demodulation, qpsk, bpsk
Why do most of the block diagrams show blocks with this particular filter? Is it simply because it's a generic diagram?
Again, the block diagram you've shown is not that of a PSK transmitter, but that of a input data-to-bandpass signal direct converter, and not a g... | {
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organic-chemistry, spectroscopy, nmr-spectroscopy, ir-spectroscopy
H2 (8.162) 7.34 + 0.82
H3 (7.514) 7.34 + 0.17
H4 (7.651) 7.34 + 0.31
Looking at the published tabulated data for substituent effects on monosubstituted benzene rings (I'm using Pretsch, Buhlmann and Badertscher, but lots of other sources are available... | {
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algorithms, distributed-systems
I cannot just make the member with the lowest ID be the one to send the message, as that person might not be online.
So, is this problem, a problem with a known solution? And what might that be?
I hope the explanation makes sense. Let's say that the expected time a message takes in tran... | {
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extra payment. Either that, or else start all payments at the start of each month, so you would use instead the formula $PV = \sum_{n=0}^{47} 500/(1.0075)^n,$ which gives a slightly different annuity expression. | {
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"tags... |
# Triangles in 20 non-straight-line "dots"
• August 22nd 2010, 07:07 AM
grottvald
Triangles in 20 non-straight-line "dots"
Twenty points/dots are given so that the three of them are never in a straight line. How many triangles can be formed with corners(as in vertex i think?) in the dots?
• August 22nd 2010, 07:21 AM
... | {
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"openwebmath_score": 0.6234351396560669,
"... |
the form 2! 2X has the inverse function f ( x ) \ ) a * x^2 where a a! Then defined as f ( x ) = 2x + 1 f^ { −1 } ( x ) 2x... But y = x that no parabola ( quadratic function ) will have an inverse is! Constant function have an inverse of a many-to-one function would be one-to-many, which n't. To explain with their sets... | {
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"lm_q1q2_score": 0.8649548821630948,
"lm_q2_score": 0.8807970858005139,
"openwebmath_perplexity": 374.5139080277813,
"openwebmath_score": 0.8467493653297424,
"tags": ... |
php, design-patterns, mvc, database, codeigniter
In accordance with my linked answers, it goes without saying that I'd strongly suggest your declaring all properties explicitly, and implementing a getter and setter for each property, too.
Anyhow, if you've done that, you can change the getObject method to:
public func... | {
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probability-theory, random-walks
As for $\mathbb{E}(S_T)$, since you have a stationary distribution, then your chain is positive recurrent (see Chapter 21 of Markov Chains and Mixing Times). Your chain is not ergodic due to a parity issue, so let's consider the square of your chain (moving two steps at once). The squa... | {
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"tags": "probability-theory, random-walks",
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c++, strings, c++11, reinventing-the-wheel
int main()
{
RawString str1("how are you");
RawString str2(str1);
RawString str3 = str1;
RawString str4;
str4 = str1;
str4 = "how are you";
RawString str5 = str1 + str2;
return 0;
}
Is my implementation correct?
Should swap be friend?
Shou... | {
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Let $g(x, y)=x^{2} y+\cos y+y \sin x$, Which of the following statements is TRUE?Let $g(x, y)=x^{2} y+\cos y+y \sin x$ Which of the following statements is TRUE? (A) $g_{x}=2 x y+\cos y+y \cos x$. (B) $g_{y}=2 x-\sin y+\s ... close 0 answers 7 views Determine, giving reasons, whether the sequence$\left\{a_{n}\ri... | {
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"lm_q2_score": 0.8933094103149354,
"openwebmath_perplexity": 1692.4324426317335,
"openwebmath_score": 0.8441284894943237,
"tags": ... |
wavelet, time-frequency, cwt, ssqueezepy
Title: What do computed CWT frequencies and color values correspond to? I wanted to make wavelet transform and represent the frequencies as function of time instead of the scale of the wavelet as function of time. This example that uses ssqueezepy does it however I would like t... | {
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combinatorics, packing
When, $m \bmod 3 = 1$, or $m = 3\ell + 1$, there is a bin with $\ell + 1$ items in any solution. Hence, their total weight is at least $(\ell + 1)(3M - 10K(n+1))$. On the other hand, the size of bin is $S + M \leqslant (R + (3\ell + 1) \cdot 3M) / 3 + M = R/3 + (3\ell + 2)/3 \cdot 3M$. Again, th... | {
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"tags": "combinatorics, packing",
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} |
vba, excel
This works just fine and is designed to only check one column. I don't want to check the whole sheet with this I already have another sub that does this.
I want to make sure that this is the most efficient way to go about it. right now it checks each cell from top to bottom and then clears the contents if i... | {
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navigation, ekf, gps, microstrain-3dmgx2-imu, robot-localization
<param name="map_frame" value="map"/>
<param name="odom_frame" value="odom"/>
<param name="base_link_frame" value="base_link"/>
<param name="world_frame" value="odom"/>
<param name="odom0" value="odometry/gps"/>
<param name="imu0" value="/imu/... | {
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... |
8. Loser66
Thanks for the guidance. Question: is there any link among the roots?
9. freckles
assume $\sqrt[3]{i}=x+yi \\ \text{ cube both sides } i=(x+yi)^3 \\ i=x^3+(yi)^3+3x^2(yi)+3x(yi)^2 \\ i=x^3-3xy^2+3x^2yi-y^3i \\ \text{ so we have } x^3-3xy^2=0 \text{ and } 3x^2y-y^3=1 \\ \text{ assume } x \neq 0 \text{ so }... | {
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"lm_q2_score": 0.8244619306896955,
"openwebmath_perplexity": 2030.136319444923,
"openwebmath_score": 0.7247201204299927,
"tags": ... |
newtonian-mechanics, newtonian-gravity, angular-momentum, orbital-motion, centrifugal-force
Title: Since the gravitational force is only attractive, why does matter not just concentrate into a small sphere? This doubt has been wandering in my head for a long time. The gravitational force is only attractive force not a... | {
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ros-melodic
Originally posted by PeteBlackerThe3rd with karma: 9529 on 2019-01-09
This answer was ACCEPTED on the original site
Post score: 0
Original comments
Comment by stevemartin on 2019-01-09:
Yes, I figured this out and the problem disappeared :)
Can you also look at my newest question? LINK | {
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Math Focus: Mainly analysis and algebra
Quote:
Originally Posted by v8archie \begin{align} f(xy) &= f(x) + f(y) &(x\ne 0,\, y\ne 0) \\[8pt] \text{differentiating with respect to $x$} \implies y f'(xy) &= f'(x) \\ f'(xy) &= \frac{f'(x)}{y} \\ \text{differentiating the original equation with respect to $y$} \implies x f... | {
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"lm_q2_score": 0.8479677622198946,
"openwebmath_perplexity": 1510.6061530137974,
"openwebmath_score": 1.0000100135803223,
"tags... |
conservation-laws, interference, weak-interaction
Gravitational interactions will “force” neutrinos in a beam to “choose” a mass in the same way as a clean measurement of the flight time. But Earth’s gravity is too feeble to have this effect. Long-baseline neutrino-beam experiments on Earth send the beam through Eart... | {
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ros2
Comment by ravijoshi on 2022-08-13:
The colcon test shows similar warnings in ROS Galactic in Ubuntu 20.04.4 LTS as well. I checked the "streams.log" file and can not find any information about my test case "test_node_namespaces". So I am sharing the streams.log file and test_service_member_function.py for your r... | {
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"openwebmath_score": null,
"tags": "ros2",
"url": null
} |
c++, object-oriented, c++11, tree
Node& operator=(const Node);
~Node() {
delete lChild;
delete rChild;
}
private:
T data;
Node *lChild;
Node *rChild;
};
BinaryTree() {root = nullptr;}
~BinaryTree() {delete root; root = nullptr;}
Bin... | {
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"openwebmath_score": null,
"tags": "c++, object-oriented, c++11, tree",
"url": null
} |
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