text stringlengths 1 1.11k | source dict |
|---|---|
c#, mysql
if (filterCod != "")
{
queries.Add(String.Format("codice_prodotto LIKE '%{0}%'", filterCod));
}
if (filterArt != "")
{
queries.Add(String.Format("articolo LIKE '%{0}%'", filterArt));
}
if (filterDescr != "")
{
queri... | {
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"tags": "c#, mysql",
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) and ( B ) matrix Ssuch that STASis diagonal not be diagonalizable over! ( but not all diagonalizable matrices are diagonalized numerically using computer software \displaystyle {... Matrix S and a diagonal matrix a matrix if it 's diagonalizable, but makes the cubic.: Justify or give a counterexample: 1 Ssuch that ST... | {
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"id": null,
"lm_label": "1. YES\n2. YES\n\n",
"lm_name": "Qwen/Qwen-72B",
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"openwebmath_score": 0.9740905165672302,
"tags": nu... |
digital-communications, continuous-signals, digital-filters, downsampling, complex
Title: std::cosf fluctuation: Results are off in low frequencies I attempted to generate a continuous wave signal by using the C++ cos/sin functions. It's partly successful, meaning high frequencies seems ok, but very low frequencies gi... | {
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"tags": "digital-communications, continuous-signals, digital-filters, downsampling, complex",
... |
evolution, zoology, embryology
Title: Why do pandas have a high probability of giving birth to twins? According to the BBC documentary "Wild About Pandas", about half of panda birth result in twins. Why do they have such a high probability compared to other mammals? What factor(s) control that fraction in general fo... | {
"domain": "biology.stackexchange",
"id": 11761,
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"tags": "evolution, zoology, embryology",
"url": null
} |
object-oriented, design-patterns, vba
Emphasis mine. | {
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"tags": "object-oriented, design-patterns, vba",
"url": null
} |
transfer-function
Are my definitions correct? You are right about all points but the first: "real" here refers to a real-valued system with a transfer function satisfying
$$G(s)\in\mathbb{R}\quad\textrm{for}\quad s\in\mathbb{R}$$
I.e., if $G(s)$ is the ratio of two polynomials then all polynomial coefficients are real... | {
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"tags": "transfer-function",
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} |
gazebo-camera
Title: how to change SetFrame Rate in Camera plugin?
in my camera plugin,I use this method "camera->SetRenderRate(30)"and"SaveFrame()"
but,the frame rate is really slow(http://ppt.cc/Xdzp)
how can I save 30 frame per second?
Thank you~
Originally posted by Zheng yo chen on Gazebo Answers with karma: 8... | {
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-
Hint It can be done simply without CRT. $\rm\:x\equiv -2\:\ (mod\ \rm3,5)\iff x\equiv -2\equiv 13\pmod{ 15}\:$ Now since $13\equiv 1\pmod 2\:$ we conclude $\rm\:x\equiv 13\:\ (mod\ 2,15)\iff x\equiv 13\pmod{30}\:$
Hence your hunch was correct: it is easy (these are often warm-up exercises to CRT).
Thus this const... | {
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"openwebmath_perplexity": 384.9136038028865,
"openwebmath_score": 0.9208005666732788,
"tag... |
newtonian-mechanics, energy, kinematics, work
Derivations (or at least, convincing arguments) of the kinetic energy
formula that didn't require the work formula required relativity to
make sense, which is unbelievable considering that Newtonian mechanics
were established well before relativity. | {
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"tags": "newtonian-mechanics, energy, kinematics, work",
"url": null
} |
deep-learning, optimization, topology, convergence, hyper-parameters
Epoch index
Learning rate hyper-parameter value
Observed rate of convergence
The goal of such work would be to develop, via manual application of analytic geometry experience or via deep network training the following function, where
$\alpha$ is th... | {
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"tags": "deep-learning, optimization, topology, convergence, hyper-parameters",
"url": null
} |
general-relativity, spacetime, quantum-gravity, causality, time-travel
$$ g^{\mu \nu} T_{\mu \nu} < 0 $$
That is, exotic matter violates the Strong Energy Condition, which is known to hold in all known quantum physical theories.
This applies not only to CTC, but as well as stable wormholes, warp drives, or anything ac... | {
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"tags": "general-relativity, spacetime, quantum-gravity, causality, time-travel",
"url": n... |
organic-chemistry, aromaticity
Firme, C. L.; Antunes, O. A. C.; Esteves, P. M. Electronic nature of the aromatic adamantanediyl ions and its analogues. J. Braz. Chem. Soc. 2008, 19 (1), 140–149. DOI: 10.1590/S0103-50532008000100020.
LibreTexts
What is Y-aromaticity? Is the trinitromethanide anion aromatic? Aromaticity... | {
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"tags": "organic-chemistry, aromaticity",
"url": null
} |
algorithms, complexity-theory, time-complexity, randomized-algorithms
Title: Complexity bound on $RP^{RP}$ This is a homework question, I'm wondering if anyone could help. Recall $RP$ is the set of languages recognized by randomized algorithms in polynomial time. The question is given an algorithm in $RP$ allowed to... | {
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"tags": "algorithms, complexity-theory, time-complexity, randomized-algorithms",
"url": null
} |
beginner, php, object-oriented, mvc
Stay away from using global declaration. This is really an archaic way of programming that fell out of favor 10 years ago, but still renders its ugly head in PHP codebases and code samples out there in the wild. If a class/method/function needs a database connection, pass it in as a... | {
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"tags": "beginner, php, object-oriented, mvc",
"url": null
} |
6 Modeling with Trigonometric Functions 9. A ferris wheel has a diameter of 180m and the center of the wheel is 115m above ground. Write tanu as the ratio of two other trigonometric functions. these functions in novel contexts in their future mathematics, science, and engineering classes. In 8 seconds the point P will ... | {
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"id": null,
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"lm_q1_score": 0.9833429570618729,
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"lm_q2_score": 0.8539127473751341,
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"openwebmath_score": 0.6883447766304016,
... |
algorithm, strings, go, search
You have allocations that are totally superfluous, given current test case, and they could be avoided by changing the input parameters types.
Lets give it a try
The code is updated to
package main
func main() {
}
type badMatchTable struct {
table [256]int
pattern []byte
}
f... | {
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"tags": "algorithm, strings, go, search",
"url": null
} |
frequency-spectrum, convolution
applicable, though the result is no longer just simple Manchester coding.
Note , however, that the Sylvester construction of the $16\times 16$
Hadamard matrix $H_{16}$ gives
$$H_{16}=\left[\begin{matrix}
H_4&H_4&H_4&H_4\\
H_4&-H_4&H_4&-H_4\\
H_4&H_4&-H_4&-H_4\\
H_4&-H_4&-H_4&H_4\\\end{m... | {
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"tags": "frequency-spectrum, convolution",
"url": null
} |
ros, bagfile, vlp16, velodyne
...
rosrun rosbag record -O your_vlp16_070815.bag /velodyne_packets
See the rosbag record documentation for other options and details.
Originally posted by joq with karma: 25443 on 2015-07-08
This answer was ACCEPTED on the original site
Post score: 5 | {
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"tags": "ros, bagfile, vlp16, velodyne",
"url": null
} |
data-structures, time-complexity, runtime-analysis
→ Is this an efficient solution? Or there is something wrong within my solution?
Your solution is valid and follows definition of d-ary heap. But as you pointed out your notation is a bit sophisticated.
You might use those two following functions to retrieve parent o... | {
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"tags": "data-structures, time-complexity, runtime-analysis",
"url": null
} |
asymptotics, recurrence-relation, big-o-notation
Anyway, in this case if we start from the solution of the recurrence $S(n)=S(n-1)+O(n)$, which is $O(n^2)$, we observe that $S(\sqrt{n})=O(n)$, so also the solution of $T(n)=T(\sqrt{n})+T(n-1)+O(n)$ is in $O(n^2)$.
I have to admit that this approach doesn't seem (also t... | {
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"tags": "asymptotics, recurrence-relation, big-o-notation",
"url": null
} |
evolution, book-recommendation
There are several hypotheses about the evolution of dominance. It is important first of all, to note that empirical observations show that beneficial alleles tend to be more dominant than detrimental alleles. There are a number of hypotheses and I won't be able to make a complete review.... | {
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"tags": "evolution, book-recommendation",
"url": null
} |
performance, beginner, go
Title: Make logparser faster I'm learning go. I wrote a simple logparser for SLF4J in Python some time ago and tried to port it to go as an exercise. The algorithm is identical, but the go-solution isn't quite as fast (the Python solution is about 1.5 times faster for large enough logfiles). ... | {
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"tags": "performance, beginner, go",
"url": null
} |
# “we note that the matrix Σ can be taken to be symmetric, without loss of generality”
I'm reading the book Pattern Recognition and Machine Learning by Christopher Bishop, and on page 80, with regard to the multivariate gaussian distribution:
$$\mathcal{N}(\mathbf{x} | \boldsymbol{\mu}, \boldsymbol{\Sigma}) = \frac{1... | {
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"tags... |
navigation, odometry, robot-localization
twist:
twist:
linear:
x: 4.96720266342
y: 0.0
z: 0.0
angular:
x: 0.0
y: 0.0
z: 0.0
covariance: [0.00044456301839090884, 8.409973020206962e-07, 0.0, 0.0, 0.0, -2.7008354663848877e-08, 8.409971883338585e-07, 7.954953140654197e-0... | {
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"id": 29039,
"lm_label": null,
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"openwebmath_score": null,
"tags": "navigation, odometry, robot-localization",
"url": null
} |
artificial-satellite, planetary-science, volcanism
Juno will constrain $\boldsymbol k_{\boldsymbol 2}$ to help clarify the physical origin of Io’s volcanism
Juno will monitor lo volcanic activity, including the polar region. Global mapping addresses where internal dissipation of tidal heating occurs. What is $k_2$, ho... | {
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"tags": "artificial-satellite, planetary-science, volcanism",
"url": null
} |
mathematical-physics, computational-physics, oscillators, acoustics
The more points you process, and the more stringent the condition of RHS=LHS equality you pick, the more accurate will the plot look.
A problem with this approach is that when you put a point on the plot, your algorithm doesn't know which branch it b... | {
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"tags": "mathematical-physics, computational-physics, oscillators, acoustics",
"url": null... |
c, file-system, posix
Opening a file with O_WRONLY may well cause the file to be truncated on the first write, and new storage allocated - there's no expectation that the new contents will overwrite the disk blocks previously allocated to the file. In any case, overwriting like shred is only effective for filesystems... | {
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"tags": "c, file-system, posix",
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} |
gazebo-plugin, gazebo-1.3
Running roswtf gives the following output, but everything seems to be functional and happy in rxgraph.
ERROR Communication with [/rosout] raised an error:
ERROR Communication with [/robot_state_publisher] raised an error:
ERROR Communication with [/drc_robot_controller_spawner] raised an er... | {
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"tags": "gazebo-plugin, gazebo-1.3",
"url": null
} |
optics, visible-light, vision, image-processing
Finally a bit about "clean air". In astronomy (if you haven't guessed my field yet, now you know.) we refer to distortions caused by the atmosphere as "seeing". Seeing is often measured in arcseconds ($3600'' = 60' = 1^\circ$), referring to the limit imposed on angular r... | {
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"tags": "optics, visible-light, vision, image-processing",
"url": null
} |
physical-chemistry, thermodynamics, kinetics
$\ce{H2 +Cl2 =2HCl}$ with $\Delta n=0$.
Like can it be associated to why the reaction is zero order? This equation holds for a reaction involving ideal gases at constant T. Under these conditions, $\Delta (pV) = \Delta n RT$. Assume now that a gas phase reaction occurs at c... | {
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"tags": "physical-chemistry, thermodynamics, kinetics",
"url": null
} |
beginner, strings, rust, elisp
#[test]
fn test_parse_doctrines_with_anchors() {
use super::yaml_rust::YamlLoader;
let s = r#"
- name: Armor Battleships
categories:
- category: &ewar
[
Blackbird,
Celestis,
Maller,
]
- name: Armor Confessors
categories:
- categor... | {
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"url": null
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newtonian-mechanics, reference-frames, centripetal-force, centrifugal-force
Title: How to make a boy fall from the merry-go-round?
I want to make this boy fall in the game and not able to figure out a way or formula which is responsible to make this boy fall from merry go round | {
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"tags": "newtonian-mechanics, reference-frames, centripetal-force, centrifugal-force",
"u... |
c#, linq
Title: Split a list of objects into a list and a grouping, based on criteria I'd like to know what's the most efficient and correct way to do the following:
We're given a list of objects. Here's an exampler object:
public class Search
{
public string ColumnName {get; set;}
public string Value {get; s... | {
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rosinstall, osx
[rosmake-1] Starting >>> cpp_common [ make ]
[rosmake-1] Finished <<< cpp_common [PASS] [ 1.66 seconds ]
[rosmake-1] S... | {
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"tags": "rosinstall, osx",
"url": null
} |
quantum-mechanics, hilbert-space, wavefunction, schroedinger-equation
$$i\frac{h}{2\pi}\frac{d}{dt} |\psi \rangle=H|\psi \rangle$$
But the wave function and the hamiltonian should respectively be interpreted as 3 dimensional and 6 dimensional matrices.
Is this the correct generalisation to three dimensions? It is not ... | {
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"url": n... |
python, mongodb, twitter
self.db.Tweets.insert(data)
def email_me_error(status_code):
"""Sends specific error codes to me."""
server = smtplib.SMTP('smtp.gmail.com', 587)
server.starttls()
server.login("xxx@gmail.com", "xxx")
msg = "The twitter stream received a {} error and disconnected!{}".for... | {
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F. Under 1 there must be at least 1 since the solution has at least one 1 (the
one under a 5..9 number). However it could not be exactly 1 as then there would
be 2 (or more) 1's in the solution.
G. If there were 3 or more ones, then they must be under 2..9 . But then there
would be a 5 (or more) under zero + a 3 (or m... | {
"domain": "stason.org",
"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.969785412932606,
"lm_q1q2_score": 0.8459897509268901,
"lm_q2_score": 0.8723473663814338,
"openwebmath_perplexity": 1260.6151974306902,
"openwebmath_score": 0.7816751003265381,
"tags": nul... |
java, math-expression-eval
}
}
return calculatedValue;
}
private void getCalIndex() {
endIndex = 0;
startIndex = 0;
for (String element : data) {
endIndex++;
startIndex++;
if (element.equals(")")) {
for (int i = endIn... | {
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"openwebmath_score": null,
"tags": "java, math-expression-eval",
"url": null
} |
thermodynamics, energy, free-energy, molecular-dynamics
See, for instance:
https://onlinelibrary.wiley.com/doi/full/10.1002/jcc.21776
If you are modeling a constant T and V system, where there is no work done, the equilibrium constant would give you the Helmholtz free energy:
$$\Delta A = - R T ln K^{'}_{eq}$$
where A... | {
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"tags": "thermodynamics, energy, free-energy, molecular-dynamics",
"url": null
} |
inorganic-chemistry, redox
$$-1.66~\mathrm{V} = 0~\mathrm{V} + \frac{0.059~\mathrm{V}}{2} \lg \frac{[\ce{H+}]}{1}\\
\frac{0.059}{2} \mathrm{pH} = 1.66 \\
0.059 \times \mathrm{pH} = 3.32 \\
\mathrm{pH} = 3.32 / 0.059 = 56$$
Whoops, so we would need a pH of $56$ to allow the reduction of aluminium in the presence of wat... | {
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"tags": "inorganic-chemistry, redox",
"url": null
} |
arrangement of the binomial coefficients now let 's take a look at Pascal triangle! Build the triangle, in mathematics, is a divisor of every number in that.... In a triangular pattern are numbers of the arithmetical triangle before Pascal Philosopher.. History of the binomial coefficients traced back to Pappus ( ca su... | {
"domain": "co.uk",
"id": null,
"lm_label": "1. YES\n2. YES\n\n",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9808759610129464,
"lm_q1q2_score": 0.8109017254898088,
"lm_q2_score": 0.8267117940706734,
"openwebmath_perplexity": 1170.8963865649305,
"openwebmath_score": 0.8729562163352966,
"tags": nul... |
javascript, game, html5, canvas
(squareTaken[0]===squareTaken[4] && squareTaken[4]===squareTaken[8] && squareTaken[0] != "") ||
(squareTaken[2]===squareTaken[4] && squareTaken[4]===squareTaken[6] && squareTaken[2] != "")
)
{
//Declare winner
alert(squ... | {
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"lm_name": null,
"lm_q1_score": null,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "javascript, game, html5, canvas",
"url": null
} |
organic-chemistry
Title: Functional Groups Identification
Identify functional groups of the following organic molecule:
A. ketone, alkene, carboxylic acid, ester
B. alkyne, ester, carboxylic acid, aldehyde
C. carboxylic acid, alkene, ketone, ester
D. ester, aldehyde, carboxylic acid, alkene
I am not sure what the a... | {
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"openwebmath_score": null,
"tags": "organic-chemistry",
"url": null
} |
java, graph
public class DirectedGraph<T> {
private final Map<T, Map<T, Double>> graphData = new HashMap<>();
private final Map<T, T> nodeSet = new HashMap<>();
private int edgeCount = 0;
public int getNodeCount() {
return nodeSet.size();
}
public int getEdgeCount() {
... | {
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"lm_q2_score": null,
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"openwebmath_score": null,
"tags": "java, graph",
"url": null
} |
electromagnetism, waves, electromagnetic-radiation, photons, wavelength
And all the frequencies of the wavelengths of photons define electromagnetic spectrum.
The frequencies of the classical electromagnetic spectrum define the energy of the photon, h*nu, not the photon the frequency, because it is only the probabil... | {
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"openwebmath_score": null,
"tags": "electromagnetism, waves, electromagnetic-radiation, photons, wavelength",
"url":... |
java, algorithm, iterator, dynamic-programming, n-queens
place(x, y);
push(-1);
continue mainLoop;
}
}
pop();
}
next = null;
}
}
/** isSafePosition() iterates positions to chec... | {
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"openwebmath_score": null,
"tags": "java, algorithm, iterator, dynamic-programming, n-queens",
"url": null
} |
botany, plant-physiology
The second answer has nothing to do with plants. It's that atmospheric CO2 traps solar heat, causing the Earth to be warmer than it otherwise would. Without the extra CO2 from fossil fuels, Earth maintained a comfortable temperature, one that we'd all (and I mean not just humans, but all lif... | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "botany, plant-physiology",
"url": null
} |
machine-learning, comparison, terminology, online-learning, active-learning
Title: What is the difference between active learning and online learning? The definitions for these two appear to be very similar, and frankly, I've been only using the term "active learning" the past couple of years. What is the actual diffe... | {
"domain": "ai.stackexchange",
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"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "machine-learning, comparison, terminology, online-learning, active-learning",
"url": n... |
particle-physics, cold-fusion
Title: Does muon halflife have any application in cold fusion concept? As we know muon being more massive than electron species is more likely to fuse , but muon decays quickly , does that have any implications in nuclear fusion ? In the muon-catalyzed fusion process, the muons basically ... | {
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"openwebmath_score": null,
"tags": "particle-physics, cold-fusion",
"url": null
} |
But in problem 2 this won't work because we can't get rid of any of three variables by isolating it to a scalar factor. Instead we can try additive cancellation. For example, adding $Q+R$ cancels $y$, and the result is nothing but $2xP$. So, $(-2x,1,1)\perp (P,Q,R)$ which gives $u=-x^2+y+z$ as one of solutions. Similar... | {
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"lm_label": "1. YES\n2. YES",
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"lm_q1_score": 0.9904405992420638,
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"lm_q2_score": 0.8289388104343892,
"openwebmath_perplexity": 72.22499343519176,
"openwebmath_score": 0.9307030439376831,
"tags"... |
python, ros-melodic
# RPY to convert: 90deg, 0, -90deg
q = quaternion_from_euler(1.5707, 0, -1.5707)
print "The quaternion representation is %s %s %s %s." % (q[0], q[1], q[2], q[3])
(this code is just a copy-paste from the linked wiki page)
Originally posted by gvdhoorn with karma: 86574 on 2020-09-02
This answ... | {
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"openwebmath_score": null,
"tags": "python, ros-melodic",
"url": null
} |
beginner, c, parsing
printf("%s\n", removeWhiteSpace(currentLine));
//If line isn't commented, read it
if (!findWord (currentLine, "!"))
{
if (checkForReturn(currentLine))
{
... | {
"domain": "codereview.stackexchange",
"id": 35178,
"lm_label": null,
"lm_name": null,
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"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "beginner, c, parsing",
"url": null
} |
the very basics from a 1 transistor sine wave generator, consi#105: More. The sine value is obtained from trigonometric tables. The Amplitude is the height from the center line to the peak (or to the trough). 414 x the RMS value. 9 V amplitude, 100 Hz sine wave. Engine TypeForces Air Cooling, 4 Stroke, OHV Single Cylin... | {
"domain": "keduku.fr",
"id": null,
"lm_label": "1. Yes\n2. Yes",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9559813476288301,
"lm_q1q2_score": 0.8047696224185478,
"lm_q2_score": 0.8418256532040708,
"openwebmath_perplexity": 940.2265415389599,
"openwebmath_score": 0.6763566732406616,
"tags": null... |
lowpass-filter, window-functions
Why would one use a Hann or Bartlett window?
Filtering sidelobes | {
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"lm_q2_score": null,
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"openwebmath_score": null,
"tags": "lowpass-filter, window-functions",
"url": null
} |
newtonian-mechanics, forces, friction, work
Title: Work done by friction opposing a force at an angle Let's imagine there's a block of mass m sitting on a rough surface with a kinetic friction coefficient $\mu$. It's being pulled with a constant force $A$ at $h$ degrees above the horizontal and is displaced a distance... | {
"domain": "physics.stackexchange",
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "newtonian-mechanics, forces, friction, work",
"url": null
} |
php, laravel, eloquent
I could then create getters to retrieve using object notation instead of array notation - $user->getLastName instead of $user['MGL_LastName'].
Beyond this minor piece that I'm unsure about, it's pretty straight forward. I've got a few minor bugs on how the data is being passed to the server, but... | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "php, laravel, eloquent",
"url": null
} |
concentration
I am sorry for this basic question, but I cannot find the answer on the manufacturer's website or elsewhere.
Thank you all in advance I highly recommend not looking for literature from non-authoritative sources such as drugs.com: that's a paid-advertising site and is full of partial/misinformation.
For y... | {
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"openwebmath_score": null,
"tags": "concentration",
"url": null
} |
577 µs ± 60.9 µs per loop (mean ± std. dev. of 100 runs, 10 loops each)
637 µs ± 48.2 µs per loop (mean ± std. dev. of 100 runs, 10 loops each)
733 µs ± 77.9 µs per loop (mean ± std. dev. of 100 runs, 10 loops each)
775 µs ± 108 µs per loop (mean ± std. dev. of 100 runs, 10 loops each)
794 µs ± 72.3 µs per loop (mean ±... | {
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"lm_q2_score": 0.847967764140929,
"openwebmath_perplexity": 1402.3501297137084,
"openwebmath_score": 0.2543371319770813,
"tags": nu... |
c++, recursion, unit-testing, boost, c++20
BOOST_AUTO_TEST_CASE(test_deques_generator_long_double)
{
typedef long double TestType;
TestType start_num = 1;
TestType end_num = 50;
TestType step_num = 1;
for (auto& each_test_vector : ts::test_deques_generator(start_num, end_num, step_num, 3))
{
... | {
"domain": "codereview.stackexchange",
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"openwebmath_score": null,
"tags": "c++, recursion, unit-testing, boost, c++20",
"url": null
} |
diagonal elements and rest of the is... Which of the page ( used for creating breadcrumbs and structured layout ) a consequence, the of! In Python, what you can, what you should not etc, this approach not. Sections of the elements are 0 editing of individual sections of the followings is false 1 a. Some examples for 2x... | {
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"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.939024825960626,
"lm_q1q2_score": 0.8223857213221187,
"lm_q2_score": 0.8757869851639066,
"openwebmath_perplexity": 676.3077628390124,
"openwebmath_score": 0.6951348185539246,
"t... |
php, unit-testing
public function testNewObject0 ()
{
$this->object0 = new Qyy_G_en_File($this->filenames[0]);
$this->assertEquals(true, is_a($this->object0, 'Qyy_G_en_File'));
}
public function testNewObject1 ()
{
$this->object1 = new Qyy_G_en_File($this->filenames[1]);
$this->assertEquals(... | {
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"id": 740,
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"lm_q2_score": null,
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"openwebmath_score": null,
"tags": "php, unit-testing",
"url": null
} |
ros
$ apt-get source libassimp2
Reading package lists... Done
Building dependency tree
Reading state information... Done
Picking 'assimp' as source package instead of 'libassimp2'
E: Unable to find a source package for assimp | {
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"openwebmath_score": null,
"tags": "ros",
"url": null
} |
java, time-limit-exceeded, complexity
Apart from that, your code is a bit chaotic. I would suggest separating user interface from program logic, for example writing one method that accepts an int[] (or long[]) as a parameter and returns an int[] of equal length containing the sum of \$x\$ and \$y\$ for every array ele... | {
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"openwebmath_score": null,
"tags": "java, time-limit-exceeded, complexity",
"url": null
} |
These facts CAN be postulates, but they don't have to be. It's a matter of how an author chooses to present geometry to his audience.
Different geometry texts choose different starting points. The best way to do geometry is to start with as few assumptions as possible, and prove everything from those. Many texts "c... | {
"domain": "themathdoctors.org",
"id": null,
"lm_label": "1. YES\n2. YES",
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"lm_q1_score": 0.9787126438601956,
"lm_q1q2_score": 0.8176982994955964,
"lm_q2_score": 0.8354835350552604,
"openwebmath_perplexity": 490.923540117864,
"openwebmath_score": 0.6749465465545654,
"tag... |
quantum-mechanics, schroedinger-equation, hydrogen
\end{align}$$
Define $C_m = A_m + B_{-m}$ so that:
$$\begin{align}
y_l (\phi, \theta) &= \sum_{m = 1}^{\infty} C_m e^{im\phi} \Theta_{m,l}(\theta) + \sum_{m = 1}^{\infty} C_{-m} e^{-im\phi} \Theta_{m,l}(\theta) + (A_0 + B_0) \Theta_{0,l}(\theta) \\ &= \sum_{m = -\inft... | {
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"openwebmath_score": null,
"tags": "quantum-mechanics, schroedinger-equation, hydrogen",
"url": null
} |
During a 45-minute lunch period, Albert (A) went running and Bill (B) walked for exercise. Linear function word problems Calculator tables. Multiple Choice Questions have been coming in Class 10 Linear Equations exams, thus do MCQs to test understanding of important topics in the chapters. Heart of Algebra questions on... | {
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"id": null,
"lm_label": "1. YES\n2. YES\n\n",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.986363161511632,
"lm_q1q2_score": 0.8621575883180621,
"lm_q2_score": 0.8740772384450967,
"openwebmath_perplexity": 1239.807064332939,
"openwebmath_score": 0.620610773563385,
"tags": nul... |
performance, python-3.x, programming-challenge, reinventing-the-wheel, converting
In [110]: %timeit IPv6Address_test('100')
2.13 µs ± 33.5 ns per loop (mean ± std. dev. of 7 runs, 1000000 loops each)
In [111]: IPv6Address_test('100::')
Out[111]: True
In [112]: IPv6Address_test('255.255.255.255')
Out[112]: False
In ... | {
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"tags": "performance, python-3.x, programming-challenge, reinventing-the-wheel, converti... |
machine-learning, neural-network, optimization, gradient-descent, hyperparameter
To me, the second option is better since it can lead to the optimal point
Not so fast; gradient descend is not applicable everywhere: there are mathematical prerequisites for a function in order to be eligible for optimization using grad... | {
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"id": 6263,
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"openwebmath_score": null,
"tags": "machine-learning, neural-network, optimization, gradient-descent, hyperparamete... |
algorithms, optimization, dynamic-programming, subsequences
There are in total $3^t$ different combinations of taking elements from $i$-th position and it can be easily fixed in code using additional $3^t$ states.
if $a \le b \le c$ is not met:
$$dp[a][b][c][i] = -inf$$
Result of the given task is stored in one of $dp... | {
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"openwebmath_score": null,
"tags": "algorithms, optimization, dynamic-programming, subsequences",
"url": null
} |
# Homework Help: Geometric Series Test Rather Than Integral Test
1. Oct 6, 2012
### Bashyboy
1. The problem statement, all variables and given/known data
$\sum_{n=1}^{\infty} \frac{1}{2^n}$
2. Relevant equations
3. The attempt at a solution
Could I some how manipulate this to fit a geometric series, so that I may ... | {
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"lm_q2_score": 0.8333245911726382,
"openwebmath_perplexity": 2702.980543284261,
"openwebmath_score": 0.5732260346412659,
"tag... |
thermodynamics, temperature, vacuum
In fact, depending on if you are in a shadow or not, it is more likely that you get hot very quickly. With no atmosphere to absorb some of the sunlight, you get the full intensity and have no efficient way to transfer it to another object. To minimize this, astronauts have white spa... | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "thermodynamics, temperature, vacuum",
"url": null
} |
formal-charge
Title: Naming Ionic Compounds with Transition Metals Look at $\ce{FeO2}$. We know that $\ce{O2}$
is $-2$ then we must have $-4$ for $\ce{Fe}$
So $\ce{Fe}$ must have $+4$ charge so then is it $\ce{Fe(IV)}$ ? As stated in the Wikipedia article for iron:
Like other group 8 elements, iron exists in a wide ... | {
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"openwebmath_score": null,
"tags": "formal-charge",
"url": null
} |
diffusion, chaos-theory
This intermittent dynamics is often described by means of Lévy flights, which are random walks where long steps are more likely than for the Brownian motion. The step length probability distribution for these systems is then said to be fat tailed – which confirms your impression that “sufficien... | {
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newtonian-mechanics, mathematics
By the way, I wrote vectors in boldface rather than with arrows. Both notations are fine. I don't like having multiple things (arrows and dots) piled on top of symbols, but that's just my taste. | {
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quantum-mechanics, quantum-information, hilbert-space, quantum-entanglement, density-operator
So what's the business with entanglement? To see this, let's have a look at a truly entangled state:
$$ \rho= 1/2(|00\rangle+|11\rangle)(\langle 00|+\langle 11|) =1/2(|00\rangle\langle 00|+|11\rangle\langle 00|+ |00\rangle\la... | {
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"tags": "quantum-mechanics, quantum-information, hilbert-space, quantum-entanglement, densi... |
electromagnetism, forces, magnetic-fields
If you have data at N points, your total area is A, R is the average radius, r is the radius at a given point, the net force can be given as,
$$ F =( \Sigma f ) \cdot 2 \cdot \pi \cdot R \cdot \frac{A}{N} $$
A bit more accuracy can be gained by
$$ F = \Sigma (f \cdot r) \cdo... | {
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"tags": "electromagnetism, forces, magnetic-fields",
"url": null
} |
experimental-physics, education, photoelectric-effect, experimental-technique
From a pedagogic point of view it seems to be better to use just the same material for anode and cathode.
What are the problems in using the same materials? If one would use the same metal, then both electrodes would be equally photosensiti... | {
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... |
A bijective map that is not a homeomorphism
Let the map $f:[0,2\pi)\to S^1; t\mapsto e^{it}$. This map is clearly continuous and bijective. The inverse map associates to each point $z$ on the circle, the argument of $z$ modulo $2\pi$. it seems like $f$ is an homeomorphism, i know it is not but i don't see why? Is ther... | {
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quantum-chemistry, orbitals, electronic-configuration, hybridization, carbon-family
However, how are the second shell electrons distributed in a non-hybridized carbon atom? Does such an atom even naturally occur or does it always hybridize? | {
"domain": "chemistry.stackexchange",
"id": 14770,
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forces, entropy, biology, casimir-effect
Title: Relation between Casimir and hydrophobic effects Background
Some years ago I was studying "Fundamentos de biología" (Biology fundamentals) and learned how the lipids create a bilayer due to the water repulsion. Some time later I learned that this was called the hydrophob... | {
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"tags": "forces, entropy, biology, casimir-effect",
"url": null
} |
rotational-dynamics, rotational-kinematics, rotation, rigid-body-dynamics, angular-velocity
From the image above and considering the rigid body constraints we get,
$\pmb{{\rho_1}\times (\dot{\rho_1}\times \dot{\rho_2} )} = \pmb{(\rho_1 . \dot{\rho_2})\dot{\rho_1}} - \pmb{(\rho_1 . \dot{\rho_1})\dot{\rho_2}} = -\pmb{(\... | {
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"id": 68482,
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python, plugin
and then, only after you can start counting. And as it is much easier using this structure, you can start converting the list of list into a single list of couples that will mimic the table layout:
table = [
(layer, len(group))
for group in layers
for layer in group
]
Turning this list of c... | {
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philosophy, definitions
So, directly to your question, for something to be considered as "having AI", it needs to be able to deal with unknown environments/circumstances in order to achieve its objective/goal, and render knowledge in a manner that provides for new learning/information to be added easily. There are man... | {
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"tags": "philosophy, definitions",
"url": null
} |
#### Questions¶
1. How can we work with arrays of differing shapes without needing to manually loop or copy data?
2. How can we reframe operations on data to avoid looping in Python?
### 1. Using broadcasting to implicitly loop over data¶
Broadcasting is a useful NumPy tool that allows us to perform operations betwe... | {
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"openwebmath_score": 0.6070868372917175,
"tags": nul... |
cell-biology, mitochondria, chloroplasts
Title: Was the mitochondrion or chloroplast first? I still don't know if the mitochondrion or chloroplast was first? I've looked for it on the internet and in various books but haven't found anything. Does anyone have the answer and a theory which backs up this answer? Mitoch... | {
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"tags": "cell-biology, mitochondria, chloroplasts",
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to. This scaling behaviour, called exponential time,. T (n) = T (n. Some authors leave out the absolute values. 2 Solving recurrences •The analysis of merge sort from Lecture 1 required us to solve a recurrence. Notation We write n2 = O(n3), [ read as: n2 is contained in O(n3) ] But we never write O(n3) = n2 Example O(... | {
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"lm_q1_score": 0.9783846640860381,
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"lm_q2_score": 0.8267117962054049,
"openwebmath_perplexity": 755.8091052138295,
"openwebmath_score": 0.8108016848564148,
"tags":... |
This created the same result as Solution 1, $y=-\frac{1}{3}x^2+\frac{1}{3}x+2$.
CAS Aside: No students offered these next two solutions, but I believe when using a CAS, it is important for users to remember that the machine typically does not care what output form you want. The standard form is the only “algebraicall... | {
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"lm_q1_score": 0.9852713848528318,
"lm_q1q2_score": 0.8294267154073537,
"lm_q2_score": 0.8418256412990657,
"openwebmath_perplexity": 931.0489525390027,
"openwebmath_score": 0.7766989469528198,
"tags": ... |
molecular-biology, molecular-genetics, homework, mutations
Title: A mutation question from the Indian National Biology Olympiad
DNA was isolated from wild type (Gal+) and mutant (Gal-) E. coli cells and separated by density gradient centrifugation technique. DNA from Gal- strain acquired a lower position. This indica... | {
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"tags": "molecular-biology, molecular-genetics, homework, mutations",
"url": null
} |
python, beginner, tic-tac-toe
Title: Tic Tac Toe in Python 3 Learning to code with python this is what i came up with. But looking at the code i am sure there are ways to improve. I would really appreciate a constructive review and some guidelines.
from itertools import cycle
game = [[0, 0, 0],
[0, 0, 0],
... | {
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"tags": "python, beginner, tic-tac-toe",
"url": null
} |
electrostatics, capacitance
Title: Would the capacitance be higher or lower than $\epsilon_0A/d$ if fringing effect was not neglected? If we were not to neglect the fringing of the electric field lines in a parallel-plate capacitor, would we calculate a higher or lower capacitance? I thought in energy related terms, n... | {
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"id": 84352,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "electrostatics, capacitance",
"url": null
} |
nuclear-physics, neutrons, magnetic-moment, pauli-exclusion-principle, strong-force
Title: Is there a repulsive force between neutrons at all distances or just real close? With particles of the same charge there is a repulsive force at all distances and physicists talk about neutrons repelling each other. Does this re... | {
"domain": "physics.stackexchange",
"id": 19505,
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"lm_q2_score": null,
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"openwebmath_score": null,
"tags": "nuclear-physics, neutrons, magnetic-moment, pauli-exclusion-principle, strong-forc... |
javascript, php, jquery, performance, ajax
When the user sends a message, the message is written on the page before saving.
This code comes before the AJAX call. Is it right?
$('.context').append('<div class="inner">'+ text +'</div>');
This function shows messages:
$(document).ready(function () {
$(window).load(... | {
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"id": 30421,
"lm_label": null,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "javascript, php, jquery, performance, ajax",
"url": null
} |
quantum-mechanics, thermodynamics, statistical-mechanics, physical-constants
Title: Statistical mechanics and Planck constant universality In questions that ask about Planck's constant entering into statistical mechanics, a common and accepted answer is that Planck's constant is an arbitrary normalization that falls o... | {
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"tags": "quantum-mechanics, thermodynamics, statistical-mechanics, physical-constants",
"... |
quantum-mechanics, time, operators, observables
Title: Time as a Hermitian operator in quantum mechanics In non-relativistic QM, on one hand we have the following relations:
$$\langle x | P | \psi \rangle ~=~ -i \hbar \frac{\partial}{\partial x} \psi(x),$$
$$\langle p | X | \psi \rangle ~=~ i \hbar \frac{\partial}{\pa... | {
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"id": 52186,
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"tags": "quantum-mechanics, time, operators, observables",
"url": null
} |
wow, I swear, If I didn't major in CS, Physics would have most likely been my next choice :P
Lets say we have an 8 sided dice. Let's say one of the sides of the dice is not a number but a color.
As I land on the numbers continuously what is the probability of the dice landing on the color?
IE.
Let's assume I'll be ... | {
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"lm_q1_score": 0.9711290963960278,
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"lm_q2_score": 0.8459424411924673,
"openwebmath_perplexity": 614.497041578082,
"openwebmath_score": 0.690247654914856,
"t... |
control, matlab
Title: How to move root locus to the left? I'm trying to control system that has 3 poles (2 in the right half plane)
I sketched root-locus but the two positive poles are going right and never be in the left half plane at any value of k
The state space of system is following
A =
0 1 0
-3.20205979037... | {
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"id": 1192,
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"tags": "control, matlab",
"url": null
} |
algorithms, computational-geometry
Title: Given a moving ball in a grid, which squares does the ball reach? You are given an m x n grid. A dimensionless ball is placed at the centre of one of the grid squares and starts moving in one of 4 directions: north-east, north-west, south-east, or south-west. The ball continue... | {
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"id": 5492,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "algorithms, computational-geometry",
"url": null
} |
ros, ros-kinetic, 2d-nav-goal
Hello, is it possible if I could see the revised? I've been trying for days to find a way to make a square or circular path using multiple goals in cpp.
Comment by Jasmin on 2020-06-19:
Hi, can you be more precise or share your progress so we can help you better? | {
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.price,body .twitter-share:hover i,.twitter-share.hovered i,body .linkedin-share:hover i,.linkedin-share.hovered i,body .google-plus-share:hover i,.google-plus-share.hovered i,.pinterest-share:hover i,.pinterest-share.hovered i,.facebook-share:hover i,.facebook-share.hovered i,.woocommerce-page ul.products li.product .... | {
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"id": null,
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"lm_q1_score": 0.9572778000158575,
"lm_q1q2_score": 0.8383714508542798,
"lm_q2_score": 0.8757869981319863,
"openwebmath_perplexity": 11396.313708180473,
"openwebmath_score": 0.7313063144683838,
"tags... |
java, algorithm, traveling-salesman
TSPUtils can be dissolved by putting the algorithm into TSPSolver where I would have expected it to be. ( refactoring: inline)
You have abstract algorithm elements in AnnealingSolver that should be moved to TSPSolver. The problem is that they are mixed with concrete concerns. You sh... | {
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"tags": "java, algorithm, traveling-salesman",
"url": null
} |
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