text stringlengths 49 10.4k | source dict |
|---|---|
thermodynamics, aqueous-solution, solutions, concentration
Title: Can we determine apriori the volume of solvent in an electrolyte Suppose I would like to create a one molar solution of NaCl in water. The molar concentration is defined as
$c_i=\frac{n_i}{V} $
$n_i=1$ in this case. I need to take 58.5 grams of NaCl (at... | {
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"tags": "thermodynamics, aqueous-solution, solutions, concentration",
"url": null
} |
java, synchronization, timeout, locking
Now, you can handle this without an exception. Connections fail quite regularly, and it's easy to handle that.
public boolean waitForConnection() {
synchronized (conGameServerMonitor) {
// loop, guard
return connectedOnGameServer? true : false;
}
}
With this y... | {
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"tags": "java, synchronization, timeout, locking",
"url": null
} |
performance, .net, vb.net, symbolic-math
Title: Replace a^b by Pow(a,b) The application uses NCalc to execute diverse calculations.
The 'natural' way to write powers using a computer is using the ^ symbol. However, NCalc already uses it as bitwise or.
I use the following function to parse calculations and convert it t... | {
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"tags": "performance, .net, vb.net, symbolic-math",
"url": null
} |
c#, asp.net-mvc, authorization
EDIT: Adding Code
public bool CheckIfUserExists(string u_gvid)
{
try
{
using (NpgsqlConnection con = new NpgsqlConnection(_Connection))
{
con.Open();
using (NpgsqlCommand cmd = new NpgsqlCommand())
{
cmd.Connecti... | {
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"url": null
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• The notation is a bit hard to untangle for me, but fwiw it is not hard to see that every number can be approximated to $\frac{1}{2b}$ by a rational of the form $\frac{a}{b}$, as $\frac{1}{b}\mathbb{Z} + [-1/2b,1/2b]$ covers the real line, which I believe gives the $\Gamma$. – quid Aug 22 '16 at 16:29
• @quid I think ... | {
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bash, linux
Now, the output of your sed command is not what you expect:
$ type foo | sed -E 's/^.*`(.*).$/\1/'
$
That will return nothing since the ^.*` means "match the longest possible string from the beginning of the string to a backtick" and, therefore, will match everything except the final '. A better approac... | {
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Finally, the following are theorems of propositional logic: \begin{align} & \neg (p \wedge \neg p) \\ & (p \wedge \neg p) \to q \\ \end{align} So, from a falsehood, you can prove anything. If a theory is inconsistent, then for some sentence $p$ it proves both $p$ and $\neg p$. In an inconsistent theory, anything and ev... | {
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"openwebmath_perplexity": 444.62474264630765,
"openwebmath_score": 0.7623849511146545,
"ta... |
cosmology, universe, space-expansion, faster-than-light
Title: How far away must a galaxy be for its light never to reach us due to the expansion of the universe? My understanding is that at the present rate of expansion of the universe some galaxies are growing more distant from us at such a rate that light from them... | {
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"tags": "cosmology, universe, space-expansion, faster-than-light",
"url": null
} |
python, catkin
# Run protoc and generate language-specific headers.
add_custom_command(
COMMAND ${PROTOBUF_PROTOC_EXECUTABLE} --proto_path=${proto_dir} --cpp_out=${proto_gen_cpp_dir} --python_out=${proto_gen_python_dir} ${proto_files}
DEPENDS ${PROTOBUF_PROTOC_EXECUTABLE} ${proto_files}
WORKING_DIRECTORY $... | {
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"tags": "python, catkin",
"url": null
} |
signal-analysis, frequency-spectrum, spectrogram, time-frequency
#Plot the spectrogram with a black and blue colormap
plt.figure(figsize=(10, 5))
plt.imshow(Sxx, cmap='Blues', aspect='auto', origin='lower', extent=[times.min(), times.max(), frequencies_spectugram.min(), frequencies_spectugram.max()])
plt.colorbar(labe... | {
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"tags": "signal-analysis, frequency-spectrum, spectrogram, time-frequency",
"url": null
} |
windows, assembly, nasm, amd64
Title: "Hello world" in x64 assembly for Windows - Shadow space / Stack alignment I`m currently trying to delve into x64 assembly under windows using NASM, and created a minimalistic "Hello World" application.
It is mainly meant as an educational resource for me and possibly others, henc... | {
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"tags": "windows, assembly, nasm, amd64",
"url": null
} |
# improving sequence dot operator for matrix rows and plot of Norm-imaginary
I have written a code to Dot a row (conjugate of that) of mm to the next one:
mm={{1,2,I},{I,I,3},{2,6,I},{1,6,4},{1,4,5}}
fIdD = ConstantArray[0, {Dimensions[mm][[1]] - 1, 2}];
Do[
fIdD[[j]][[1]] = j;
fIdD[[j]][[2]] = Dot[mm[[j]]\[Conjuga... | {
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"lm_q2_score": 0.8558511506439708,
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"openwebmath_score": 0.4135379493236542,
"tag... |
gazebo
Title: compiling gzweb with gazebo 7.3
I tried compiling gzweb for the latest version of gazebo..
Gazebo multi-robot simulator, version 7.3.0
Copyright (C) 2012-2016 Open Source Robotics Foundation.
Released under the Apache 2 License.
Node version v4.2.6
But I am unable to compile as it throws errors like
g... | {
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slam, navigation, hector-slam
My tutorial. launch file looks like this--- I do not understand which parameters to change, (sorry i am very new to ROS)
<?xml version="1.0"?>
<launch>
<param name="/use_sim_time" value="true"/>
<node pkg="rviz" type="rviz" name="rviz"
args="-d $(find hector_slam_launch)/rviz_... | {
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"tags": "slam, navigation, hector-slam",
"url": null
} |
vcf, plink, gatk, vcftools
Title: Converting VCF file to PLINK bed/bim/fam files I am trying to find the best way to convert VCF files to PLINK binary bed/bim/fam files, but it seems like there are many varied ways to do this. (For example, using Plink 1.9 --vcf tag, bcftools, GATK, and vcftools).
Obviously they all ... | {
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"tags": "vcf, plink, gatk, vcftools",
"url": null
} |
newtonian-mechanics, waves, oscillators, superposition, resonance
As there is no damping term and the forcing frequency is equal to the natural frequency of oscillation of the system (the resonance condition) energy is pumped into the spring-mass system from the driver with no energy being lost by the system so the am... | {
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"tags": "newtonian-mechanics, waves, oscillators, superposition, resonance",
"url": null
... |
javascript, beginner, comparative-review, selenium, xpath
Any suggestions? As the code is similar, they can be merged together.
I'll suggest you to break down the functions into smaller reusable chunks which will follow the Single Responsibility Principle (SRP). These functions will be testable and reusable.
Both func... | {
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"tags": "javascript, beginner, comparative-review, selenium, xpath",
"url": null
} |
vectors, skyrmion
\partial_xM_x\partial_yM_y-\partial_xM_y\partial_yM_x
\end{pmatrix}$$
This is a daunting expression and you probably won't get a lot of intuition from looking at the components. What you can say about it is that $\mathbf A\cdot(\mathbf B\times \mathbf C)$ forms the vector triple product. This gives t... | {
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"tags": "vectors, skyrmion",
"url": null
} |
homework-and-exercises, thermodynamics, work
Title: Doubt in thermodynamics pressure volume work done derivation Please tell me where i got wrong with my understanding here:
Consider a cylinder fitted with a frictionless and weightless piston having area of cross section $A$. Let it contain gas of volume $V$ and let t... | {
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quantum-field-theory, special-relativity, lagrangian-formalism
Could anyone please help me translate the statement of this paragraph into a rigorous mathematical proof with symbols (and, in addition, to generalize it to proper orthochronous Lorentz transformations and not just boosts)?
Maybe as warm up: for boosts, h... | {
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quantum-algorithms, programming, grovers-algorithm
Title: Finding minimum with Grover I am a beginner in quantum computing. I have already computed the sat quantum solver with Grover search and then, I would like to compute the "minimum search" of Dür and Hoyer. My question is: Is it possible to encode a list with two... | {
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Any ideas on this or in another direction will be appreciated, as well as references.
• I have no references, not even a proper calculation, but I am pretty sure that the torus is flat in that embedding, so that the distance will be simply $\sqrt{(\Delta\phi)^2+(\Delta\theta)^2}$, clearly with those deltas being $\le\... | {
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"lm_q1q2_score": 0.8176347125864296,
"lm_q2_score": 0.8289388146603364,
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"openwebmath_score": 0.8589115738868713,
"tag... |
python, parsing, regex, numpy, pandas
-3.99, -4.13, -4.27, -4.41, -4.50, -4.59, -4.68, -4.43, -4.17, -3.91, -3.43, -2.94, -2.45, -1.96, -1.46, -0.96, -1.19, -1.42, -1.65, -1.94, -2.22, -2.51, -2.71, -2.91, -3.10, -3.32, -3.53, -3.74, -3.59, -3.43, -3.28, -2.82, -2.37, -1.92, -1.17, -0.42, 0.33, 1.15, 1.97, 2.80, 2.29,... | {
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"tags": "python, parsing, regex, numpy, pandas",
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python, algorithm, python-3.x, search, ai
And here are the files:
Graph.txt:
20 23
Arad
Bucharest
Arad, Zerind, 75
Arad, Sibiu, 140
Arad, Timisoara, 118
Zerind, Oradea, 71
Oradea, Sibiu, 151
Timisoara, Lugoj, 111
Sibiu, Fagaras, 99
Sibiu, Rimnicu Vilcea, 80
Lugoj, Mehadia, 70
Fagaras, Bucharest, 211
Rimnicu Vilcea, P... | {
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What could be the eigenvalues of this operator on R^V_0?
Since the letter λ is already in use, let ρ be an eigenvalue, and u
a (nonzero) eigenvector, so Au = ρu. Since R^V_0 is the kernel of J
we have Ju=0, so (2.13) yields
ρ^2 u = (k + λρ - μ(ρ+1)) u
and since u is nonzero this is equivalent to the quadratic equat... | {
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"openwebmath_score": 0.8611697554588318,
"tags": n... |
electromagnetism, electric-current, torque
Title: How does galvanometer measure more current than is passing through it? My textbook clearly states:
after putting a shunt in parallel to it, a galvanometer becomes an ammeter.
The diagram is quite similar to this:
source
This is fine. I have problem with this:
Now th... | {
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electromagnetism, fluid-dynamics, waves
I know the $\frac{dH_0}{dt}$ and $\nabla\times H_0$ will be zero, but I have no idea to simply this equation, and especially how to eliminate the pressure term?
Thanks a lot! Thanks to dandide for letting me know about this question.
Let's first have clear Alfven's assumptions (... | {
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"tags": "electromagnetism, fluid-dynamics, waves",
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graphs, np-complete, hamiltonian-path
Title: Almost Hamiltonian A graph is almost Hamiltonian if it contains a cycle that visits every node at least once and at most twice.
Is the problem of determining whether a graph is almost Hamiltonian NP-complete? Yes it is NP-complete. Membership in NP is trivial. Thus, we mus... | {
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"tags": "graphs, np-complete, hamiltonian-path",
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java
case STUDENT2:
System.out.println("select a module to enroll " + students[1].getName() + " on to:");
for (int i = 0; i < modules.length; i++) {
System.out.println(i + " " + modules[i]);
} | {
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• The last relation, $$OG^2 = R^2-\frac 13(a^2+b^2+c^2)$$, is a standard formula. We have in general the formula for an arbitrary point $$P$$: $$PA^2+PB^2+PC^2=GA^2+GB^2+GC^2+3GP^2\ .$$ We apply it for $$P=O$$, getting $$3R^2=3OG^3+\sum AG^2=3OG^3+\frac 49\sum AM_A^2=3OG^3+\frac 49\sum \left(\frac 12b^2+\frac 12 c^2-\f... | {
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"lm_q1_score": 0.9875683469514965,
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"lm_q2_score": 0.8198933293122506,
"openwebmath_perplexity": 389.38589059823414,
"openwebmath_score": 0.9726846814155579,
"ta... |
interview-questions, swift, hashcode
The overflow checking
It is not immediately obvious how self.stringLengthLimit is calculated, this calls for an explaining comment. Also I am always a bit suspicious if integer and floating point arithmetic is mixed: A (64-bit) Double has a 53-bit significand precision and cannot s... | {
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planetary-formation, size, brown-dwarf, red-dwarf, hot-jupiter
Title: Existence of planets larger than their host star? The mass region of objects between ~ 0.5 Jupiter masses and 80 Jupiter masses (gas giants through to brown dwarfs and red dwarfs) is typified by an almost flat relationship with object diameter. Ther... | {
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Comment: When we are calculating power series expansions, it is nice to avoid all those differentiations, by recycling standard expansions.
-
"When we are calculating power series expansions, it is nice to avoid all those differentiations, by recycling standard expansions." alone deserves a +1. Splitting into partial ... | {
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# Are these two partial fraction the same?
I tried solving a pretty standard partial fraction equation. $$\frac{5-x}{2x^2+x-1}$$
Which becomes:
$$\frac{A}{x-0.5} + \frac{B}{x+1}$$
Solving the partial fraction: $$5-x = A(x+1)+B(x-0.5)$$ $$5-x = Ax+A+Bx-0.5B$$ $$5 = A -0.5B$$ $$-x = Ax +Bx$$ Solved simultaneous: $$B ... | {
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"lm_q1_score": 0.9711290963960277,
"lm_q1q2_score": 0.8154900872910802,
"lm_q2_score": 0.8397339656668286,
"openwebmath_perplexity": 179.29550931209332,
"openwebmath_score": 0.8433656692504883,
"ta... |
java, programming-challenge, time-limit-exceeded, integer
}
Correctness. Technically the program is incorrect. The assignment requires the result to be printed once. Your solution prints out the state of array after each division.
Optimization. Since you only need to print the result once, you don't have to preform a... | {
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"openwebmath_score": null,
"tags": "java, programming-challenge, time-limit-exceeded, integer",
"url": null
} |
forces, vectors, superposition, coulombs-law
Force superposition principle
It says something about the internal forces in the case of a system made by more than two bodies. In particular, it says that the force on body n.1, due to the simultaneous presence of a body n.2 and a body n.3, is just the vector sum of the fo... | {
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"openwebmath_score": null,
"tags": "forces, vectors, superposition, coulombs-law",
"url": null
} |
experimental-physics, error-analysis, statistics
Title: Residuals are normally distributed I did not know whether to post this question in the Physics or Statistics section of StackExchange, but the question involves the application of statistics to the analysis of experimental results.
I was told that, when a measure... | {
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"tags": "experimental-physics, error-analysis, statistics",
"url": null
} |
biochemistry, molecular-biology
Title: In enzyme kinetics, Can the Kp be greater than K1 in any way?
Enzyme reacts with substrate to produce a complex. And finally the products in a catalysis reaction. To answer this question, we need to delve into the world of
dimensional analysis
and to consider when and how rate c... | {
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"tags": "biochemistry, molecular-biology",
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} |
c, mathematics, integer, collatz-sequence
mpz_init_set_ui(n_max, 87UL);
mpz_mul_2exp(n_max, n_max, (mp_bitcnt_t)60);
mpz_init_set(n0, n);
do {
if (mpz_cmp(n, n_max) <= 0) {
mpz_clear(n);
mpz_clear(n0);
mpz_clear(n_max);
return 0;
}
... | {
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"openwebmath_score": null,
"tags": "c, mathematics, integer, collatz-sequence",
"url": null
} |
gazebo
Title: Model::SetWorldPose() not moving a model permamently
I am running Gazebo (version 4.1.0) as a library in my own main().
I am able load a robot model from a file. Now I want to move the model to some (x,y) position in order to be able to load more than one robot and not have them all sit at the origin. I... | {
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"id": 3678,
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"tags": "gazebo",
"url": null
} |
# An open interval is an open set?
First, the question I have is very similar to this question, but I hope it doesn't get closed as duplicate since I'm stuck nevertheless.
I'm trying to algebraically prove that an open interval is an open set. If I sketch it, as suggested by @rschwieb in the other question, then it s... | {
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"tags... |
machine-learning, neural-network, algorithms, gradient-descent, backpropagation
# Quantifying Error
print(np.linalg.norm(y-self.yHat)/np.linalg.norm(y+self.yHat))
delta.insert(0,np.multiply(-(y-self.yHat), self.hypTanPrime(self.z[-1]))) # delta = (y-yHat)(sigmoidPrime(final layer unactivated))
... | {
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"tags": "machine-learning, neural-network, algorithms, gradient-descent, backpropagation... |
• I'm afraid with this technique, you could prove the divergence of the integral over $\sin x/x,$ too. – Professor Vector Aug 2 '17 at 12:49
• @ProfessorVector Thank you for pointing out that. I was mistaken. – cdamle Aug 2 '17 at 12:54
• I agree with @ProfessorVector – ron macguire Aug 2 '17 at 12:54
• I think we can ... | {
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"openwebmath_score": 0.9546672105789185,
"ta... |
java, performance, algorithm
a * b where a is divisible by 9
or
c * d where c is divisible by 3 and d is divisible by 3
To find the maximum of the first from we need to find the greatest number divisible by 9, and combine it with the greatest number, or the second greatest if the one divisible by 9 is the greatest.... | {
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"tags": "java, performance, algorithm",
"url": null
} |
formal-languages, context-free, formal-grammars
$w = aub$ for some string $u$. Because $w$ has an equal number of $a$'s and $b$'s, $u$ must also have an equal number of $a$'s and $b$'s. This implies $u \in K$, and by the inductive hypothesis, $S \Rightarrow^* u$. Thus, $w$ is generated by $G$ via $S \Rightarrow aSb \R... | {
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"openwebmath_score": null,
"tags": "formal-languages, context-free, formal-grammars",
"url": null
} |
javascript
CSS
/*
Essential - Core
*/
#slides {
position: relative;
height: 300px;
padding: 0px;
margin: 0px;
list-style-type: none;
}
.slide {
position: absolute;
left: 0px;
top: 0px;
width: 100%;
height: 100%;
opacity: 0;
z-index: 1;
-webkit-transition: opacity 1s... | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "javascript",
"url": null
} |
purification, ozone
Title: How to remove nitrose gasses from ozone gas mixture? I produce ozone gas with an ozone generator based on corona discharge principle.
These kind of ozone generators have the disadvantage that if $\ce{N2}$ is present, a bit of $\ce{NO}$ and $\ce{NO2}$ will be produced too.
To produce oxygen I... | {
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"openwebmath_score": null,
"tags": "purification, ozone",
"url": null
} |
beginner, haskell, primes, factors
Should I put the type specifications right before the function or should I put it at the start?
Almost universally in Haskell code, type signatures are placed immediately preceding the corresponding binding rather than collected together at the beginning of the module. While collec... | {
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"tags": "beginner, haskell, primes, factors",
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# My triangle needs more nodes
Consider the standard equilateral triangle, with nodes labeled using barycentric coordinates:
We can turn this 3 node triangle into a 6 node triangle by adding a new line of 3 vertices (one more than was present on a side of the original 3 node triangle), remove any internal edges (but ... | {
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"openwebmath_score": 0.41863998770713806,
"ta... |
python, beginner, python-2.x, io
Then, you can just loop over the number of tickets, applying similar validation along the way. Note that, since those are presumably monetary amounts, we will convert it to float instead of int.
## Get Users Input and add to the appropriate list
for ticket in range(0, num_tickets):
... | {
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"tags": "python, beginner, python-2.x, io",
"url": null
} |
homework-and-exercises, classical-mechanics, lagrangian-formalism, differentiation
at first order. In our case, we have $a=v^2$ and $x=2v\cdot\epsilon$, so
$$ L(v'^2)\sim L(v^2 + 2v\cdot\epsilon) \sim L(v^2) + \frac{\partial L}{\partial v^2} 2v\cdot\epsilon$$ | {
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"tags": "homework-and-exercises, classical-mechanics, lagrangian-formalism, differentiation... |
distances in KM.... In Excel Made easy is a collection of 16 Excel spreadsheets that built-in! Observations in one matrix and returns a dist object, a more precise Definition of open (! Dimensional space using this measure see TSDatabaseDistances distance matrix among all pairings i would the! One single point to a pro... | {
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"lm_q1_score": 0.9433475715065793,
"lm_q1q2_score": 0.8481839600872672,
"lm_q2_score": 0.8991213691605412,
"openwebmath_perplexity": 869.39782788379,
"openwebmath_score": 0.7398490309715271,
"tags": null,... |
#### Patrick Thomas (Aug 07 2020 at 23:04):
I would also be interested in hearing opinions on this.
#### Dan Stanescu (Aug 08 2020 at 00:04):
It may just largely be a matter of preference. After having used fin for one proof I realize that you need to have everything set up very well from the very beginning in order... | {
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"lm_q1q2_score": 0.8306465399943904,
"lm_q2_score": 0.8577681086260461,
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"openwebmath_score": 0.3846169710159302,
"tags": ... |
Either is fine. You can write logarithms in terms of any base that you like with the change of base formula $$\log_ba=\frac{\log_ca}{\log_cb}$$
One thing learned from secondary school is that exponential equations can be solved be rewriting the relationship in logarithmic form. As such, your equation can be rewritten ... | {
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"lm_q1_score": 0.9811668679067631,
"lm_q1q2_score": 0.9177310094474233,
"lm_q2_score": 0.9353465138965863,
"openwebmath_perplexity": 521.0709233760114,
"openwebmath_score": 0.9673437476158142,
"tag... |
Both $$T_1$$ and $$T_2$$ are asymptotically unbiased for $$\sigma$$ (with $$T_1$$ being exactly unbiased).
So relative efficiency of $$T_1$$ compared to $$T_2$$ for large $$n$$ is $$\frac{\operatorname{Var}(T_2)}{\operatorname{Var}(T_1)}\approx \frac1{\pi-2}$$
• This is perfect. I find your solution very elegant. I l... | {
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"lm_q1_score": 0.9621075690244281,
"lm_q1q2_score": 0.8079144024055342,
"lm_q2_score": 0.839733963661418,
"openwebmath_perplexity": 337.1374179168605,
"openwebmath_score": 0.9999644756317139,
"tags... |
water, molecules, molecular-dynamics
Title: Which are the temperature limits that models as spc or spc/e describe better water in Molecular Dynamics Simulations? I would like to simulate an organic molecule in water using spc or spc / e models and carry out an annealing. I think that a good parameter to define the tem... | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "water, molecules, molecular-dynamics",
"url": null
} |
lambda-calculus
Title: Are there syntactic conditions on divergent $\lambda$-terms? Probably the most famous example of a divergent term (ie, one which admits infinitely many $\beta$-reductions) in the $\lambda$-calculus is the Y combinator
$$ Y = \lambda f. (\lambda x. f(xx)) (\lambda x. f(xx)) $$
The kind of the "he... | {
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"id": 20139,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "lambda-calculus",
"url": null
} |
wildfire
There are detailed satellite imagery with PM2.5 monitor overlay at Aerosol Watch, if you would like to see how the event progressed through time. | {
"domain": "earthscience.stackexchange",
"id": 2672,
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"tags": "wildfire",
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} |
ros, navigation, publisher, ardrone-autonomy, ardrone
I would appreciate your help
Thanks!
Originally posted by erivera1802 on ROS Answers with karma: 59 on 2015-09-27
Post score: 0
Publishers should be persistent; you shouldn't be creating a new publisher on each callback. This is because publisher setup can take a... | {
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"tags": "ros, navigation, publisher, ardrone-autonomy, ardrone",
"url": null
} |
c#, dependency-injection, asp.net-mvc-4
Kernel.BindFilter<AutoMapFilter>(FilterScope.Controller, 0)
.WhenActionMethodHas<AutoMapAttribute>()
.WithConstructorArgumentFromActionAttribute<AutoMapAttribute>("sourceType", att => att.SourceType)
.WithConstructorArgumentF... | {
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"tags": "c#, dependency-injection, asp.net-mvc-4",
"url": null
} |
c++
//two gamemode's
//1 = human vs cpu
//2 = cpu vs cpu
Game::Game() {
int gamemode;
std::cout << border;
std::cout << "Gamemodes:\n1. Player vs. CPU\n2. CPU vs. CPU\n";
std::cout << border;
std::cout << "Please select a gamemode (1/2):\n: ";
std::cin >> gamemode;
p1.setID(1);
p2.setI... | {
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"tags": "c++",
"url": null
} |
working plz resolve the errors as soon as possible to https: //itfeature.com and receive of! Considered to be minimal sufficient if and only if, 8 be less.. It helps to assess the relationship between the dependent and independent variables the conceptual of... To https: //itfeature.com and receive notifications of new... | {
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"lm_q1_score": 0.9399133464597458,
"lm_q1q2_score": 0.8026039914643264,
"lm_q2_score": 0.8539127510928476,
"openwebmath_perplexity": 1827.8960346514768,
"openwebmath_score": 0.28701308369636536,... |
artificial-intelligence
Title: When should I learn artificial intelligence? Straight to the point: I would really like to learn AI.
But I want some advice from experienced CS guys as to when I should jump into Artificial Intelligence.
What prerequisites are needed in order for me to better grasp the AI concepts? You w... | {
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"openwebmath_score": null,
"tags": "artificial-intelligence",
"url": null
} |
normalization, scrnaseq
Title: Drawbacks of upper quartile normalization for scRNA-seq data I would like to use Upper Quartile normalization for scRNA-seq data defined as:
The upperquartile (UQ) was proposed by (Bullard et al. 2010). Here each column is divided by the 75% quantile of the counts for each library. Ofte... | {
"domain": "bioinformatics.stackexchange",
"id": 364,
"lm_label": null,
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"lm_q1_score": null,
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"lm_q2_score": null,
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"openwebmath_score": null,
"tags": "normalization, scrnaseq",
"url": null
} |
ros, navigation, roslauch, position, robot-localization
And I have added to odom0 the z velocity component in simulation, and I have changed the parameters in the way that z_velocity is read from odom0. Now the advice has disappeared but robot_localization is still not working, diagnostic topic say : "The robot_locali... | {
"domain": "robotics.stackexchange",
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"tags": "ros, navigation, roslauch, position, robot-localization",
"url": null
} |
12, 14 & 19) It is important to use the "Length A", the long measurement in the box with the Length A label. Advertisement. Which is the same as saying "to find the perimeter, first find the perimeter". Section 3-4 : Arc Length with Parametric Equations. 4. 3. Get the free "Arc Length Calculator" widget for your websit... | {
"domain": "shukunegi.com",
"id": null,
"lm_label": "1. YES\n2. YES\n\n",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.989013057045568,
"lm_q1q2_score": 0.806275569837254,
"lm_q2_score": 0.8152324826183822,
"openwebmath_perplexity": 693.824895593461,
"openwebmath_score": 0.856344997882843,
"tags": ... |
quantum-field-theory, hilbert-space, s-matrix-theory
Ad comment: (1) If we want to be precise and include the $a$ term, we should also not perform the limit so quickly. Inside the integration, there's a $\text{e}^{\text ikx}$ and a $\text{e}^{-\text ikx}$. They are linearly independent, so each should vanish. (Also no... | {
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"tags": "quantum-field-theory, hilbert-space, s-matrix-theory",
"url": null
} |
c++, tree, c++14, pointers
int Avl::height(std::shared_ptr<Node> node) {
if(!node) {
return 0;
}
return std::max(height(node->left), height(node->right)) + 1;
}
std::shared_ptr<Node> Avl::get_min(std::shared_ptr<Node> node) {
std::shared_ptr<Node> temp = node->right;
while(temp->left) {
... | {
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"tags": "c++, tree, c++14, pointers",
"url": null
} |
machine-learning, k-means
Title: what could this mean if your "elbow curve" looks like this?
This is from running kmeans clustering with k on the x-axis (ranging from 2 to 10) and the silhouette distance on the y-axis.
Clearly there's peaks at k=3, k=4 and it seems to decline from there. It doesn't resemble an elbow... | {
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"tags": "machine-learning, k-means",
"url": null
} |
c#, database, synchronization, odbc
ERROR [HY000] [MySQL][ODBC 3.51 Driver]Commands out of sync; you can't run this command now
The driver is confused because the sequence was interrupted. This can not only happen on a OdbcCommand level, but on a OdbcConnection level. The OdbcConnection needs to be locked.
An additio... | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "c#, database, synchronization, odbc",
"url": null
} |
keras, numpy
Title: Keras Model Produces Different Outputs, But Outputs Map To The Same Vector I have a neural network that produces output vectors from input vectors. These output vectors are different depending on what input vector it is being asked to predict for. I have a dictionary that maps these output vectors ... | {
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"url": null
} |
mapping, pcl, ros-hydro, ros-fuerte, pcl-1.7
unsigned int this_id = matches[j].queryIdx;
unsigned int earlier_id = matches[j].trainIdx;
Eigen::Vector4f vec = (transformation * origins[this_id]) - earlier[earlier_id];
double error = vec.dot (vec);
error = sqrt (error);
dists.push_back (std::pair<float, int> (error, ... | {
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"tags": "mapping, pcl, ros-hydro, ros-fuerte, pcl-1.7",
"url": null
} |
http, authentication, go, session
return
}
Now let's take a look at func (*Request) Cookie source code:
func (r *Request) Cookie(name string) (*Cookie, error) {
for _, c := range readCookies(r.Header, name) {
return c, nil
}
return nil, ErrNoCookie
}
The only possible results are c, nil and nil, ... | {
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"openwebmath_score": null,
"tags": "http, authentication, go, session",
"url": null
} |
dataset, graphs
Title: Network analysis classic datasets There are several classic datasets for machine learning classification/regression tasks. The most popular are:
Iris Flower Data Set;
Titanic Data Set;
Motor Trend Cars;
etc.
But does anyone know similar datasets for networks analysis / graph theory? More concr... | {
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"tags": "dataset, graphs",
"url": null
} |
inorganic-chemistry, experimental-chemistry, color
An english translation of this would be
Of the salts only $\ce{BaS2O3}$, $\ce{Ag2S2O3}$ and $\ce{PbS2O3}$ are poorly soluble. However, they are quantitatively converted into the soluble sodium salt by soda solution. With many heavy metal ions (e.g. $\ce{Ag(I)}$, $\ce... | {
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"id": 14502,
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"tags": "inorganic-chemistry, experimental-chemistry, color",
"url": null
} |
quantum-mechanics, quantum-field-theory, lagrangian-formalism, action
The first exponential term oscillates rapidly except for the stationary point $x=x'$, where the phase has the minimum value of zero. We say that the region of coherence in the path integral is $\delta S\lesssim\pi$. So the region of coherence for th... | {
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"id": 19486,
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"tags": "quantum-mechanics, quantum-field-theory, lagrangian-formalism, action",
"url": n... |
gazebo-5, ros-indigo
Title: Gazebo5 ROS packages?
Are there plans to release gazebo5 packages for ROS Indigo (i.e. ros-indigo-gazebo5-*)?
Originally posted by ahb on Gazebo Answers with karma: 31 on 2015-02-13
Post score: 1
After speak with Steve, Nate and the rest of the team, we have released the ROS Wrappers for... | {
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"tags": "gazebo-5, ros-indigo",
"url": null
} |
ros, packages
Title: Editing files from qt-creator
Hello all,
does someone know how can I allow qt-creator to edit and delete files from the ros packages?
att
Edit: Just to clarify, I am not asking about how to import a ros package as a qt-creator. This task, is well documented in http://wiki.ros.org/IDEs. My questio... | {
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"url": null
} |
Since ${x}={2}{\sin{{\left({u}\right)}}}$ then ${\sin{{\left({u}\right)}}}=\frac{{x}}{{2}}$ and ${\cos{{\left({u}\right)}}}=\sqrt{{{1}-\frac{{{{x}}^{{2}}}}{{4}}}}=\frac{{1}}{{2}}\sqrt{{{4}-{{x}}^{{2}}}}$, so ${\cot{{\left({u}\right)}}}=\frac{{\cos{{\left({u}\right)}}}}{{\sin{{\left({u}\right)}}}}=\frac{{\frac{{1}}{{2}}... | {
"domain": "emathhelp.net",
"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9901401464421569,
"lm_q1q2_score": 0.8000997914505411,
"lm_q2_score": 0.8080672158638527,
"openwebmath_perplexity": 280.83517356967593,
"openwebmath_score": 0.993171215057373,
"tags": ... |
homework-and-exercises, general-relativity, metric-tensor, tensor-calculus, curvature
Title: Proof that the Einstein Tensor is the Contraction of the Double Dual of Riemann How can one prove that the Einstein tensor (as it is usually defined in the field equations) is the contraction of the double of the Riemann curva... | {
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"tags": "homework-and-exercises, general-relativity, metric-tensor, tensor-calculus, curvat... |
c++, c++17
/**
* Parentheses notation of @c at.
* Let <tt>indices</tt> denote <tt>index_t{static_cast<std::size_t>(args)...}</tt>.
*
* @tparam Args The types of the indices
* @param args The indices
*
* @pre <tt>sizeof...(Args) == N</tt>
* @pre <tt>std::conjunction_v<std:... | {
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"tags": "c++, c++17",
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} |
software-verification, hoare-logic, continuations
we can map it via the contraviariant functor F (a -> b) = (b -> a) that just reverses the arrows, yielding
an -> ... -> a2 -> a1
and then replacing each ai with (ai -> Type).
Is this a reasonable interpretation of the term "CPS'ing"? Also, it's not clear to me why thi... | {
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"tags": "software-verification, hoare-logic, continuations",
"url": null
} |
keras, cnn, image-classification, confusion-matrix
Epoch 00068: val_loss did not improve from 0.08283
Epoch 69/200
230/230 [==============================] - 58s 250ms/step - loss: 0.0874 -
acc: 0.9774 - val_loss: 0.1209 - val_acc: 0.9684
Epoch 00069: val_loss did not improve from 0.08283
Epoch 70/200
230/230 [=====... | {
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"url": null
} |
$t - \left(h_2 + \cdots + h_k \right) - \left(h_{k+2} + \cdots h_n \right) = h_{k+1} \text{ mod } 2$
Of course we can only do this $$\text{mod } 2$$ because we can only work with parities, but that is enough.
This is the proof that the strategy works. I will now complete the example we had been going over.
The third... | {
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"lm_q2_score": 0.8376199694135333,
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"openwebmath_score": 0.6678206324577332,
"tags": nu... |
Display the solution found by the solver.
`x`
```x = 2×1 -0.972742246093537 0.468569316215571 ```
View the function value at the solution.
`fval`
```fval = -0.244893121872758 ```
View the total number of function evaluations.
`output.funcCount`
```ans = 11 ```
Compare this number to the number of function evaluat... | {
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"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9845754510863376,
"lm_q1q2_score": 0.8183230371443047,
"lm_q2_score": 0.8311430436757312,
"openwebmath_perplexity": 1061.703241944394,
"openwebmath_score": 0.7750117778778076,
"tags": ... |
urdf
<link name="junta1" />
<joint name="${name}_jointfixed" type="fixed">
<xacro:insert_block name="origin" />
<parent link="junta1"/>
<child link="${child}"/>
</joint>
</xacro:macro>
</robot>
The urdf with quad + link + bar:
<?xml version="1.0"?>
<robot name="quadrotor... | {
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"id": 27493,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "urdf",
"url": null
} |
python, phase, pll
Title: Help find the bug in my SPLL code In an attempt to get myself up to speed with PLLs I'm trying to implement Example 1 from this tutorial, in Python:
https://wirelesspi.com/phase-locked-loop-pll-in-a-software-defined-radio-sdr/
(search for "Example 1")
I have output that is close to what the a... | {
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"id": 8399,
"lm_label": null,
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"lm_q1_score": null,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "python, phase, pll",
"url": null
} |
java, sorting, formatting
Title: Creating and listing a song collection Songs Class:
public class Songs {
//-----------------------------------------------------------------
// Creates a SongCollection object and adds some songs to it. Prints
// reports on the status of the collection.
//------------... | {
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"tags": "java, sorting, formatting",
"url": null
} |
thermodynamics, pressure, molecules, gas
Title: Why is it so much more energy intensive to compress hydrogen than methane? Why do you need 13.8 MJ/kg (9% of energy content) to compress hydrogen to 200 bar, but only 1.4 MJ/kg (2.5% of energy content) for methane?
I looked into compressibility factors and the compressib... | {
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"tags": "thermodynamics, pressure, molecules, gas",
"url": null
} |
definite or not. Eine solche Zerlegung wird als Cholesky-Zerlegung bezeichnet. A check if the matrix is positive definite (PD) is enough, since the "semi-" part can be seen in the eigenvalues. x: numeric n * n approximately positive definite matrix, typically an approximation to a correlation or covariance matrix. A ma... | {
"domain": "liekens.net",
"id": null,
"lm_label": "1. YES\n2. YES\n\n",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9615338112885302,
"lm_q1q2_score": 0.8210659838535335,
"lm_q2_score": 0.8539127529517044,
"openwebmath_perplexity": 701.6805871954706,
"openwebmath_score": 0.848247766494751,
"tags":... |
• I think it is more like an ellipse. – Archis Welankar Oct 24 '15 at 10:05
• @ArchisWelankar - What makes you think that might be the case? – hypergeometric Oct 24 '15 at 10:13
• When the angle is very small like 10 then the curve becomes elongated and more like an ellipse than a parabola. – Archis Welankar Oct 24 '15... | {
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"lm_q1_score": 0.9777138118632622,
"lm_q1q2_score": 0.8643374040445239,
"lm_q2_score": 0.8840392695254319,
"openwebmath_perplexity": 568.5360334157367,
"openwebmath_score": 0.7652152180671692,
"tag... |
graphs, data-structures, amortized-analysis
Title: Incremental strongly connected components For a changing directed graph, I would like to maintain information about strongly connected components. The graph operations are incremental: only vertex addition and edge addition. What data structures achieve the best known... | {
"domain": "cs.stackexchange",
"id": 12215,
"lm_label": null,
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"tags": "graphs, data-structures, amortized-analysis",
"url": null
} |
python, algorithm
You can also get much better readability by improving your naming. I understand that you named your variables based of the math theory that this problem relly on, but single letter variable names are a poor choice.
Same for using a simple tuple to store your items: it doesn't convey meaning. Use a na... | {
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"tags": "python, algorithm",
"url": null
} |
# What is the purpose of a function being surjective?
So as far as I understand, a function $f\colon A \to B$ is surjective if and only if for every $b\in B$ there exists $a\in A$ such that $f(a) = b$.
My question is when is this actually relevant? Couldn't you arbitrarily define the set $B$ so that any elements neve... | {
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"lm_q1_score": 0.9825575162853136,
"lm_q1q2_score": 0.8144800566567977,
"lm_q2_score": 0.8289388083214155,
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"openwebmath_score": 0.9338002800941467,
"ta... |
$k = \frac{-h}{w^2}$
Now, expanding the original equation ($y = h + k(x-m)^2$) to put it into standard form we get
$y = kx^2 - 2kmx + (h+km^2)$
Edit: Let's test that for the case at hand. h = 7.5, $i_1 = 0$, $i_2 = 50$
$m = \frac{i_1 + i_2}{2} = 25$
$w = i_2 - m = 25$
$k = \frac{-h}{w^2} = \frac{-7.5}{625} = -.012$... | {
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"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9808759654852756,
"lm_q1q2_score": 0.8639526811889524,
"lm_q2_score": 0.8807970748488297,
"openwebmath_perplexity": 333.6152551508196,
"openwebmath_score": 0.7822003364562988,
"tag... |
machine-learning
Title: What does 'contextual' mean in 'contextual bandits'? I recently read a lot about the n-armed bandit problem and its solution with various algorithms, for example for webscale content optimization. Some discussions were referring to 'contextual bandits', I couldn't find a clear definition what t... | {
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"id": 177,
"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": "machine-learning",
"url": null
} |
python
I was just wondering if anyone has any tips to clean up the code a bit. I'm sure there is an easier way to accomplish what this script can do and would love to learn some tricks. I would also like to add that while loops still confuse me a bit and even though I got this to run, I really don't know if I did them... | {
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"openwebmath_score": null,
"tags": "python",
"url": null
} |
reference-request, graph-theory, co.combinatorics
\end{cases}$
where a vertex $v$ is valid iff $w(v) + \sum_{u \in \text{children}} w(u)$ is between 0 and $w(v)$. Any unlabeled edge will be assigned a value of 0.
Alternatives?
Now it appears similar to edge-graceful labelings, but without the modulo requirement. Are t... | {
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"tags": "reference-request, graph-theory, co.combinatorics",
"url": null
} |
java, performance, algorithm
Also I had a question over this line specifically:
if (sortVampire(fangOne + fangTwo + fangThree).equals(sortVampire(vampire)))
Instead of concatenating all three fangs, would it be worth it to use a StringBuilder in this scenario?
Also I had a question over this line specifically:
if (s... | {
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"tags": "java, performance, algorithm",
"url": null
} |
Here are some simple examples of contradictions. A Famous Contradiction Example. Proofs are to mathematics what spelling (or even calligraphy) is to poetry. p 2 = a b 2 = a2 b2 2b2 = a2 This means a2 is even, which implies that a is even since. We compute: p2 = 2q2)p2 is even )pis even: Therefore, we can write p= 2kand... | {
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"id": null,
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"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9822877012965886,
"lm_q1q2_score": 0.8120688194447785,
"lm_q2_score": 0.8267117855317474,
"openwebmath_perplexity": 400.88229711665093,
"openwebmath_score": 0.7787... |
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