text stringlengths 49 10.4k | source dict |
|---|---|
ros, c++, catkin-make, catkin, headers
When i try to compile this package with catkin_make I get the following linking errors:
Base path: /home/ubuntu/catkin_ws
Source space: /home/ubuntu/catkin_ws/src
Build space: /home/ubuntu/catkin_ws/build
Devel space: /home/ubuntu/catkin_ws/devel
Install space: /home/ubuntu/catki... | {
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"tags": "ros, c++, catkin-make, catkin, headers",
"url": null
} |
c#, unit-testing, regex
Assert.AreEqual(expectedTokens.Length, tokens.Length, testName);
for (var i = 0; i < expectedTokens.Length; i++)
{
Assert.AreEqual(expectedTokens[i], tokens[i], testName);
}
}
}
}
It seems like this should be a fairly common task... | {
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"tags": "c#, unit-testing, regex",
"url": null
} |
for some integers $m_1, \cdots, m_k,n_1, \cdots, n_{\ell} \ge 2.$ Then by the problems in this post and this post, we have
$\displaystyle \text{Hom}(G_1,G_2) \cong \text{Hom}(\mathbb{Z}_{m_1} \times \cdots \times \mathbb{Z}_{m_k},\mathbb{Z}_{n_1} \times \cdots \times \mathbb{Z}_{n_{\ell}}) \cong \prod_{1 \le i \le k, ... | {
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"lm_q1_score": 0.9802808730448281,
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"lm_q2_score": 0.8198933337131076,
"openwebmath_perplexity": 95.63939031809484,
"openwebmath_score": 0.969171941280365,
"tags": n... |
-
Beat me by 50 seconds. – Charles Jul 13 '12 at 1:39
Each choice of roots mod the $n_i$ corresponds to a solution of the equation mod $n$. The CRT says that, for each choice of the $n_i$ there is just one solution mod $n$. Since they must all be distinct, that gives exactly one root of the equation for each distinct ... | {
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"lm_q1_score": 0.986151386935399,
"lm_q1q2_score": 0.840154444678324,
"lm_q2_score": 0.851952809486198,
"openwebmath_perplexity": 79.57923305476221,
"openwebmath_score": 0.9685056805610657,
"tags":... |
javascript, jquery, html5, canvas
GFuY2VJRD0ieG1wLmlpZDpjNzlhOWNlMi1jZmM4LTI3NDQtOWQ5YS0wN2RkNGI0Y2YzNGQiIHN0RXZ0OndoZW49IjIwMTktMDEtMTlUMTg6MTE6MzArMDU6MzAiIHN0RXZ0OnNvZnR3YXJlQWdlbnQ9IkFkb2JlIFBob3Rvc2hvcCBDQyAyMDE4IChXaW5kb3dzKSIgc3RFdnQ6Y2hhbmdlZD0iLyIvPiA8L3JkZjpTZXE+IDwveG1wTU06SGlzdG9yeT4gPC9yZGY6RGVzY3JpcHRpb2... | {
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "javascript, jquery, html5, canvas",
"url": null
} |
optics, refraction, geometric-optics, lenses, telescopes
I've neglected the convex lens for the sake of simplicity.
It can be seen that the image $A'B'$ is formed at the midpoint of focal length on the same side of object $AB$ (image formed by the convex lens). I also verified it using the thin lens formula $\frac 1 v... | {
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"tags": "optics, refraction, geometric-optics, lenses, telescopes",
"url": null
} |
orbit
Title: International dateline In the story of Magellan in which they circled the globe ,returning to Portugal to discover that they "lost" a day. As they were traveling westward. I don't get it. They were going so slowly in those times. Took 3 years. I get that they, were traveling west so the day was slightly s... | {
"domain": "astronomy.stackexchange",
"id": 7195,
"lm_label": null,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "orbit",
"url": null
} |
game, objective-c
Title: Game Achievements without Singleton This is my first time implementing achievements in a game so I could definitely use some feedback on what I have done here. I have heard about singleton approaches to this problem, but I did not feel it was really necessary and I would rather avoid singleto... | {
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"openwebmath_score": null,
"tags": "game, objective-c",
"url": null
} |
aqueous-solution, vapor-pressure, physical-organic-chemistry
Title: Vapors of Aqueous solutions I'm dealing with a common photoresist developer TMAH (tetramethylammonium hydroxide) and attempting to design a vapor sensor for a sealed chamber. Now I havent been able to confirm what exactly is evaporating from the solut... | {
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"tags": "aqueous-solution, vapor-pressure, physical-organic-chemistry",
"url": null
} |
gazebo
Title: uri file attribute in SDF files
If the file path is relative, which is the base directory and how can we specify it?
Thanks
Originally posted by logicalguy on Gazebo Answers with karma: 73 on 2012-11-09
Post score: 1
Original comments
Comment by Erik Stoltenborg on 2012-11-09:
I think its the director... | {
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} |
Write and rearrange that inequality (i.e., first separate and then combine like-terms), and use what you discovered in part (a).
#### Vantage
##### New member
Hi Vantage. Next time, please share how far you got when you start a thread. That way, we'll know where you're stuck (saves you time).
My apologies. I'll be su... | {
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"lm_q1_score": 0.9854964220125033,
"lm_q1q2_score": 0.8057167253980259,
"lm_q2_score": 0.8175744806385542,
"openwebmath_perplexity": 2813.3602162034044,
"openwebmath_score": 0.7733606100082397,
"tag... |
python, morse-code
Title: Python implementation of a Morse code translator Here is my solution to reddit.com/r/dailyprogrammer #93 (easy)., which is a Python script that translates between English and Morse code.
Is String_To_Translate a good example of a class? Am I violating convention? How can I improve this code a... | {
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"tags": "python, morse-code",
"url": null
} |
electronics, electrical-engineering, computer
Your question is therefore one that is relevant in biology, because it is asking whether the neurons in a brain can function as a wire and switch computer, toggling other neurons. Nearly all current models of brain functions postulate that this is the way the brain works. ... | {
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"openwebmath_score": null,
"tags": "electronics, electrical-engineering, computer",
"url": null
} |
frequency-spectrum, dft, frequency-response
Title: What metrics should I use to describe the difference between two magnitude responses in octave band Suppose that I have two frequency responses $H_1(k)$ and $H_2(k)$, I want to describe the difference or MSE between them in each octave band. The background is that I h... | {
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"tags": "frequency-spectrum, dft, frequency-response",
"url": null
} |
neural-network, deep-learning
we can see that the weight of blue in the second layer is negative and small enough (more negative) such that the output can never fire if blue fires, i.e. the output can't fire if both inputs are firing.
$0 + 0 \ngtr 1 : \emptyset $ shouldn't fire
$-2 + 0 \ngtr 1 : (x \land y) = T$ sho... | {
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} |
Does the proof above look fine?
• It looks fine to me. – MereMortal47 Jul 11 '16 at 8:26
• @Asemismaiel My only concern is whether $a=f(a,b)$ if $a_{n+1}=f(a_n,b_n)$? – user Jul 11 '16 at 10:35
• $\lim f(a_n, b_n) = f(a,b)$ follows from the continuity of $f(x,y)$, for if $f(x,y)$ is continuous at $(a,b)$ then for any ... | {
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"lm_q2_score": 0.8267117983401363,
"openwebmath_perplexity": 79.00209384716372,
"openwebmath_score": 0.9685109853744507,
"tags... |
c#, winforms
Title: How to write this code without using 11 if-statements? if (progressBar1.Value == 1) { progressLabel.Text = "1%"; }
if (progressBar1.Value == 10) { progressLabel.Text = "10%"; }
if (progressBar1.Value == 20) { progressLabel.Text = "20%"; }
if (progressBar1.Value == 30) { progressLabel.Text = "30%"; ... | {
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} |
So the centroid is at $O~\left ( ~\frac{1}{5e-5} ~, ~\frac{e+1}{4}~\right )$
3. I forgot to factor the e^2-1 to cancel with the e+1 on the bottom. Thanks a bunch! You guys are always so helpful!
The grader said that it was wrong. Maybe there is an error in the system... I'll have to talk to my teacher since I'm prett... | {
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"lm_q1_score": 0.9845754510863375,
"lm_q1q2_score": 0.809507231917072,
"lm_q2_score": 0.8221891283434877,
"openwebmath_perplexity": 698.4739450220954,
"openwebmath_score": 0.9345342516899109,
"tags... |
# Sitting $n$ men and $n$ woman around a table having the wedding couple seated together
The problems says
At the wedding of John and Mary there are $n$ men and $n$ women. In how many ways they can sit at a round table, so that no two men is next to each other and John and Mary sit together?
I have some doubts becau... | {
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"lm_q1_score": 0.9799765598801371,
"lm_q1q2_score": 0.8582507264400325,
"lm_q2_score": 0.8757869948899665,
"openwebmath_perplexity": 220.78893103436843,
"openwebmath_score": 0.7359011769294739,
"ta... |
python, algorithm
Words are placed randomly one at a time, so
it is possible that later words might not fit
because of where earlier words were placed.
This tries several times to place all the words,
and returns the first grid that 'works'.
'''
You'll have to change your call to attemptGrid()toc... | {
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} |
ros, roomba, turtlebot
# construct the transform
transform = (self._pos2d.x, self._pos2d.y, 0.), odom_quat
# update the odometry state
odom.header.stamp = current_time
odom.pose.pose = Pose(Point(self._pos2d.x, self._pos2d.y, 0.), Quaternion(*odom_quat))
odom.twist.twist = Tw... | {
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"tags": "ros, roomba, turtlebot",
"url": null
} |
organic-chemistry, aqueous-solution, synthesis, carbonyl-compounds
Title: If acyl chlorides are reacted with aqueous ammonia, will carboxylic acids also be formed? As part of my A-level chemistry course, I have been taught that an acyl chloride will react violently with water to produce a carboxylic acid and hydrochlo... | {
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"tags": "organic-chemistry, aqueous-solution, synthesis, carbonyl-compounds",
"url": nu... |
programming, qiskit, noise
The thermal relaxation error channel used is very standard and a good model for relaxation errors during gates, so if gate error is completely due to $T_1$ relaxation (we call this $T_1$-limited) the model is very good. If gate error is only partially due to to relaxation then it becomes muc... | {
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"url": null
} |
Part b) $$3! \cdot S(6,3) + 2! \cdot S(6,2) = 6 \times 90 + 2 \times 31 = 602$$
• Well, thank you for your answer. But the results being different, confuses me a lot. How could they be different overall we are doing the same calculation? I hope someone can answer this. – Scott Apr 18 at 19:55
• Stirling numbers does n... | {
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"lm_q1q2_score": 0.8233490441483867,
"lm_q2_score": 0.8418256492357359,
"openwebmath_perplexity": 512.4943631042802,
"openwebmath_score": 0.7550891041755676,
"tag... |
quantum-field-theory, dirac-equation
electron at rest: $\psi_L=+\psi_R$
positron at rest: $\psi_L=-\psi_R$
The other "exotic" states where $\psi_L\neq\pm\psi_R$ at rest do show a zitterbewegung, for instance $\psi_L=i\psi_R$ or $\psi_L=\sigma_z\psi_R$. This is actually the reason why these states are not allowed. They... | {
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "quantum-field-theory, dirac-equation",
"url": null
} |
ocean, oceanography, temperature
As can be seen in the figure the compressibility is maximum at low temperatures for any salinity (not just seawater) and pressure. So in general, the compressibility of water is maximum at low temperatures due to the internal structure of water. The inverse relationship with temperatur... | {
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"id": 236,
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"tags": "ocean, oceanography, temperature",
"url": null
} |
java, algorithm, tree, validation, groovy
This tree has 102 nodes, but only [2, 3, ..., 52] are invalid. 53, 54, ..., 102 are not treated as invalid. If you add one more
Map edges = (1..102).collectEntries { [it+1 as String, it as String] }}
findInvalidNodes(edges)
assert findInvalidNodes(edges) == [2, 3, ..., 103]
... | {
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} |
entropy, work, reversibility, arrow-of-time
Suppose we define the "volume" of a number $k$ to be $|k|$ = number of bits of $k$. Then if $|p|\approx|q|$ the number $n=pq$ will have $|n|\approx 2|p|$, so the volume doubles. If $m=p+q \approx 2p$ then the volume $|m| \approx \text{ floor} (\frac{\log(2p)}{\log(2)}) = \lo... | {
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"openwebmath_perplexity": null,
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"tags": "entropy, work, reversibility, arrow-of-time",
"url": null
} |
quantum-field-theory, scattering, scattering-cross-section, s-matrix-theory, unitarity
I understand this property from Feynman rules for tree level amplitude, but I didn't get role of unitarity.
I wanna understand, how unitarity related to such property? How residues will change, if we lose unitarity? Unitarity ($SS^\... | {
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"tags": "quantum-field-theory, scattering, scattering-cross-section, s-matrix-theory, unita... |
c, linked-list, stack, gtk
I'm usually not a fan of including <stdbool.h>. The only reason you use it is for return values.
static inline bool buffer_is_too_small(Text_State *ts, Text_Node *node)
{
return space_required(node) > ts->buffer_size;
}
I prefer to just return int values themselves. This ... | {
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"tags": "c, linked-list, stack, gtk",
"url": null
} |
quantum-mechanics, homework-and-exercises, hilbert-space, operators, harmonic-oscillator
Title: Showing relation for raising and lowering operator I found this task in an older exam of quantum mechanics and it was about the harmonic oscillator and thought it would be a good practice for myself. The task goes as:
$\tex... | {
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ros, rosrun, cmake, msg
I get the following error:
ImportError: No module named semantic_label_publish.msg
Is there something I am doing wrong? If you need anymore info let me know.
Thanks
Originally posted by Tex on ROS Answers with karma: 3 on 2017-05-17
Post score: 0
Original comments
Comment by ahendrix on 2017... | {
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"tags": "ros, rosrun, cmake, msg",
"url": null
} |
java, object-oriented, assembly
import biz.tugay.hack.assembler.instruction.Instruction;
/**
* An Instruction Factory implementation should return a concrete and correct @Instruction object
*/
public interface InstructionFactory {
/**
* The implementing method must return one of the Instructions that the
... | {
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"tags": "java, object-oriented, assembly",
"url": null
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the origin. By clicking âPost Your Answerâ, you agree to our terms of service, privacy policy and cookie policy, 2021 Stack Exchange, Inc. user contributions under cc by-sa. If not passed, it is automatically computed. pdist supports various distance metrics: Euclidean distance, standardized Euclidean distance, Mah... | {
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"lm_q1_score": 0.9572778000158576,
"lm_q1q2_score": 0.8579615414081564,
"lm_q2_score": 0.896251371748038,
"openwebmath_perplexity": 833.5634533418914,
"openwebmath_score": 0.5468424558639526,
"tags": null... |
javascript, animation, typescript
let currentPerc = 0;
let animationInterval = setInterval(function () {
frameAction(currentPerc);
currentPerc += changePerFrame;
if (currentPerc >= 1) {
clearInterval(animationInterval);
thenF();
}
}, frameDelayMS);
}
... | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "javascript, animation, typescript",
"url": null
} |
machine-learning, gt.game-theory, two-player-games
Title: Sequential Two-player Game related to "Bandit Detection" Alice and Bob play a game over $n$ rounds. At each round, Alice picks a number $x_t \in [0,1]$ and Bob simultaneously chooses whether to "peek" at the number $x_t$ which is represented by a variable $y_t ... | {
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} |
Note: I didn't consider this as your equation has no leading coefficients of $$x^2,y^2,z^2$$ which means the above solution works. However, @yarchik pointed out a problem if the sphere equation is scaled and starts with $$k x^2+ky^2+kz^2+...$$ where $$k\neq1$$ then Minimize will produce the correct centers but gives a ... | {
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"openwebmath_score": 0.5108093023300171,
"tags... |
thermodynamics, statistical-mechanics, entropy, reversibility
Title: Entropy change in a reversible and Irreversible path Let's consider 2 cases. First where a system is taken from state 1 to 2 in a reversible path. Second where the same system is taken from state 1 to 2 in an irreversible path. Can we say that Entro... | {
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"tags": "thermodynamics, statistical-mechanics, entropy, reversibility",
"url": null
} |
quantum-field-theory, scattering, feynman-diagrams, lorentz-symmetry, perturbation-theory
Alternatively, the Lorentz covariance of the scattering amplitudes follows immediately from the Lorentz invariance of transition amplitudes, say, as given by the LSZ formula, e.g.
$$
\langle p_{1},\ldots ,p_{n}\ {\mathrm {out}}|q... | {
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calibration, camera
Original comments
Comment by JP on 2013-11-12:
Thanks for the reply. The problem is that the front camera is terrible. I tried to calibrate using the checkerboard method but the camera could not detect it. I was doing it correctly because I got it working on my webcam so the only problem could be t... | {
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"tags": "calibration, camera",
"url": null
} |
c++
for (std::size_t linecount=maxline; bufsize; --bufsize, ++buf) {
os << std::setw(2) << std::setfill('0') << std::hex
<< static_cast<unsigned>(*buf) << ' ';
*rsptr++ = std::isprint(*buf) ? *buf : '.';
if (--linecount == 0) {
*rsptr++ = '\0'; // terminate string
... | {
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"tags": "c++",
"url": null
} |
nanopore, long-reads, simulated-data
Michael, Todd P., et al. "High contiguity Arabidopsis thaliana
genome assembly with a single nanopore flow cell." Nature
communications 9.1 (2018): 541.
There are several data types there, as well as an assembly to train the models on.
Is it OK to train a model using reads fro... | {
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"tags": "nanopore, long-reads, simulated-data",
"url": null
} |
semiconductor-physics, fermi-energy
Title: Semiconductors - Fermi energy and function As I understand it, the Fermi function $$f(E) = \frac{1}{1+e^{(E-E_f)/(kT)}}$$ gives the probability of finding an electron at a particular energy in a material.
It also has the following property : $$f(E_f+E_0) = 1 - f(E_f-E_0)$$ wh... | {
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"tags": "semiconductor-physics, fermi-energy",
"url": null
} |
electromagnetism, photons, electrons, maxwell-equations, protons
\begin{equation}\label{eq:pr1}
\Box A_\mu-A^\nu_{,\nu\mu}=\lambda A_\mu,
\end{equation}
where $A^\mu$ is the potential of the electromagnetic field, and $\lambda$ is a Lagrange multiplier. The constraint represents a nonlinear gauge condition. One can as... | {
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"tags": "electromagnetism, photons, electrons, maxwell-equations, protons",
"url": null
} |
newtonian-mechanics, momentum, collision, computational-physics, software
% coefficient of restitution
eps = 0.5
% impact speeds
u_imp = Z.'*v
% impulses
J = -(1+eps)*inv(Z.'*inv(M)*Z)*u_imp
% J =
%
% 1.7021
% 2.1702
% 4.6277
% velocity vector change
Dv = inv(M)*Z*J
% final velocity
v_final = v+Dv
% v... | {
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"url... |
On the other hand, if $[x]$ is the nearest integer to $x$, then the limit does not exist: consider the sequence $a = (0.4,0.6,0.49,0.51,0.499,0.501,\ldots)$. Clearly $a_n \rightarrow \frac{1}{2}$, but $[a_n]$ alternates between $0$ and $1$.
-
Thanks, I'm talking about the first case where $[x]$ is the floor of $x$. Co... | {
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"openwebmath_score": 0.9549311399459839,
"tag... |
homework-and-exercises, waves, acoustics, frequency, wavelength
Title: Frequency shift in case of wind and no relative motion between observer and source I've learned the following things about Doppler effect in the case of sound waves
The Doppler effect formula is to be used in the air reference frame (where $v_{sou... | {
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} |
electricity, experimental-physics, earth, space
The paper uses 200KV instead of 300, but both are in the right ballpark. The paper figures out the most power that can be extracted from an equivalent circuit diagram. It also shows how little can be extracted from local harvesting.
An interesting intro to the the whole... | {
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"tags": "electricity, experimental-physics, earth, space",
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} |
Base step ($n=2$): Since $n=2$ is trivially a product of primes (actually one prime, really), $S(2)$ is true.
Inductive step: Fix some $m\geq 2$, and assume that for every $t$ satisfying $2\leq t\leq m$, the statement $S(t)$ is true. To be shown is that $$S(m+1) : m+1 \text{ is a product of primes},$$ is true. If $m+1... | {
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"openwebmath_score": 0.9403507113456726,
"tags... |
thermodynamics, energy, statistical-mechanics, entropy, calculus
$$
E(S(T))=\left( \frac{T}{4} \right)^{\frac43}.
$$
Even in this trivial example, it is clear that $E(S)$ is not the same function of S as $E(S(T))$ is a function of $T$. Therefore, one should use a different symbol. Actually, $E(S(T))$ is different from... | {
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"tags": "thermodynamics, energy, statistical-mechanics, entropy, calculus",
"url": null
} |
pr.probability
For distributions $p,q,p',q'$, we have
$$
||p\otimes q-p'\otimes q'||
\le
||p-p'||
+
||q-q'||
-
||p-p'||
\cdot
||q-q'||.
$$
From here, it immediately follows that if $p=p_1=p_2=\cdots=p_k$
and $q=q_1=p_2=\cdots=q_k$ and furthermore $||p-q||=d$,
then the TV between the corresponding products is upper-bo... | {
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"tags": "pr.probability",
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} |
qiskit, ibm-q-experience, ibm-quantum-devices
Title: How many Qubits does the qiskit implementation of Shor's Algorithm need to factor N=15? I know there is a documentation for qiskit.aqua.algorithms.Shor that explains that they used this reference for implementing the actual circuit. It says that the number of qubit ... | {
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} |
java, object-oriented, game
// DEBUG INFO
// System.out.println(String.format("y: %d, x: %d", row, col));
// Check wherever it's valid
if (row >= SIZE || col >= SIZE || row < 0 || col < 0) {
return;
}
if (grid.isOccupied(row, col)) {
... | {
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"tags": "java, object-oriented, game",
"url": null
} |
c++, reinventing-the-wheel, vectors
template<class T>
unsigned int Vector<T>::capacity()const {
return _capacity;
}
template<class T>
Vector<T>::~Vector() {
delete[] buffer;
}
template <class T>
void Vector<T>::clear() {
_capacity = 0;
_size = 0;
buffer = 0;
Log = 0;
} Your code is C++03 like... | {
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"tags": "c++, reinventing-the-wheel, vectors",
"url": null
} |
x\frac1{\sqrt2}-\sin x\frac1{\sqrt2}\right)^2\\ &=2\sqrt 2(\cos^2x-\sin^2x)+4\left(\frac1{\sqrt2}\sin x\frac1{\sqrt2}\cos x\right)\\ &=2\sqrt 2(\cos^2x-\sin^2x+\sin x\cos x) \end{align} | {
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"id": null,
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"lm_q1_score": 0.9833429590144718,
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"lm_q2_score": 0.817574471748733,
"openwebmath_perplexity": 6603.728776170174,
"openwebmath_score": 0.9884965419769287,
"tags... |
genetics, dna, molecular-genetics, gene-expression, gene-regulation
Title: Do DNA repressors exist? I know about enhancers and the mechanism that lead them to increase the gene expression of their targets but I was wondering if similarly DNA repressors exist. I know about protein repressors but I am looking for some k... | {
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"tags": "genetics, dna, molecular-genetics, gene-expression, gene-regulation",
"url": null... |
php, mysql
if(isset($final)) {
$newcounter = $final['sent'];
/* Increment the counter, and store it in the database, then set the lastactive names in the database. ($this->activetime) */
$newcounter++;
$this->set_counter($final['tc_name'], $newcounter);... | {
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"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "php, mysql",
"url": null
} |
quantum-field-theory, dirac-equation
Title: What is negative about negative energy states in the Dirac equation? This question is a follow up to What was missing in Dirac's argument to come up with the modern interpretation of the positron?
There still is some confusion in my mind about the so-called "negative energy"... | {
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"tags": "quantum-field-theory, dirac-equation",
"url": null
} |
robotic-arm, turtlebot, robot-state-publisher
this text is repeated 4 times (From the traceback line, and then prints out what is below and roswtf terminates
=
===============================================================================
Static checks summary:
No errors or warnings
=================================... | {
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"tags": "robotic-arm, turtlebot, robot-state-publisher",
"url": null
} |
beginner, file, http, rust, server
Introduce more functions to break up the distinct parts of read_request. From my inspection, there's a part that parses the request, a part that handles the request by reading a file, and a part that responds (which already exists). Note that doing this contrains the number of lines ... | {
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"tags": "beginner, file, http, rust, server",
"url": null
} |
audio, mfcc
Title: Speech comparison algorithm for rating on similarities I am trying to compare 2 speech samples and rate them on similarities. Think of someone trying to repeat a phrase, and then comparing those 2 audio files.
I started by implementing the MFCC (http://en.wikipedia.org/wiki/Mel-frequency_cepstrum) ... | {
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"tags": "audio, mfcc",
"url": null
} |
electrochemistry, solubility, analytical-chemistry
$$E^\circ_\text{cell} = E^\circ_\text{cathode} − E^\circ_\text{anode}$$
Since, the reduction potential of copper is lower, it will be the reducing agent in this reaction.
$$E^\circ_\text{cell} = -0.7993\ \mathrm{V} + 0.518\ \mathrm{V}$$
$$E^\circ_\text{cell} = -0.281\... | {
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"tags": "electrochemistry, solubility, analytical-chemistry",
"url": null
} |
known as ‘Coefficient of dispersion’ 3. The heights in cm of a group of first year biology students were recorded. They are: 1. o Measure of dispersion. & = 5\% \\ o Variance. S & = 0.00452^{\frac {1}{2}} \\ 58, 66, 71, 73, 74, 77, 78, 82, 84, 85, 88, 88, 88, 90, 90, 92, 92, 94, 96, 98, 2. o Understand the difference b... | {
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"lm_q2_score": 0.8376199694135332,
"openwebmath_perplexity": 633.2571005208761,
"openwebmath_score": 0.8919327259063721,
"... |
lisp, common-lisp, deque
Title: Deque class in Common Lisp I created a library with two CLOS class to implement a deque structure similar to the one available in C++, plus a few Lisp-ian twists. The two classes are node, which implements a doubly linked list, and deque, which uses node to implement the actual deque.
T... | {
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"tags": "lisp, common-lisp, deque",
"url": null
} |
ros, ros2, ros-crystal, windows10
Originally posted by marguedas with karma: 3606 on 2019-04-05
This answer was ACCEPTED on the original site
Post score: 0
Original comments
Comment by Mr. Nobody on 2019-04-05:
I am not able to comprehend your answer completely. Could you please guide me to an example for windows mac... | {
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"tags": "ros, ros2, ros-crystal, windows10",
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} |
ros2, rosbridge
However when I run ros2 run ros1_bridge dynamic_bridge --bridge-all-topics I see the following
Created 2 to 1 bridge for service /gazebo/pause_physics
Created 2 to 1 bridge for service /gazebo/reset_simulation
Created 2 to 1 bridge for service /gazebo/reset_world
Created 2 to 1 bridge for service /gaze... | {
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"tags": "ros2, rosbridge",
"url": null
} |
logic, model-checking, temporal-logic, computation-tree-logic
Title: Computation tree logic and Kripke structures Specifications in Kripke structures are verified by Computation tree logic (CTL). However, refering to this Wikipedia article the CTL-operators are relative to a current state. So, when we want to verify i... | {
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"tags": "logic, model-checking, temporal-logic, computation-tree-logic",
"url": null
} |
performance, beginner, haskell, graph
-- number of vertices in an equivalence class
ecLength :: EquivClass -> Int
ecLength = length . verts
-- for a given y = (y_1,...,y_n) and a bound m, find all vectors
-- x = (x_1,...,x_n) such that |x| = m and x_i <= y_i
boundSequences :: (Num a, Ord a, Enum a) => a -> [a] -> [[a... | {
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"openwebmath_score": null,
"tags": "performance, beginner, haskell, graph",
"url": null
} |
virology, coronavirus
Title: How would a "synthetic defective interfering SARS-CoV-2" work in practice? Wouldn't it require a large fraction of all cells to be infected? The abstract of A synthetic defective interfering SARS-CoV-2 is as follows.
Abstract
Viruses thrive by exploiting the cells they infect, but in orde... | {
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"tags": "virology, coronavirus",
"url": null
} |
algorithms, graphs, bipartite-matching, computational-complexity
As I remember from my algorithm class, in the augmenting path algorithm, once a node in the left side has been assigned to the matching it never leaves it. Hence, the algorithm tries to make sure that in each iteration certain sets will be satisfied... | {
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "algorithms, graphs, bipartite-matching, computational-complexity",
"url": null
} |
navigation, costmap, clear-costmap, amcl, move-base
Title: navigation stack get crash
Hi, I am working with the navigation stack and when I command a goal (by rviz) which is inside an obstacle I get the following error. This is something I have begun to experience recently (after upgrading some Ros packages).
If you ... | {
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"openwebmath_score": null,
"tags": "navigation, costmap, clear-costmap, amcl, move-base",
"url": null
} |
unit-testing, react.js, dom, jsx, state
It’s annoying that I have to use Number(h2.innerHTML) in here in order to get the latest count value. Alternatively I could redefine count whenever clicking the button to get the latest innerHTML value (as the state changes):
count = Number(h2.innerHTML);
expect(count).toBe(1);... | {
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "unit-testing, react.js, dom, jsx, state",
"url": null
} |
thermodynamics, work, conventions, adiabatic
Title: Adiabatic processes Adiabatic process is a process that involves no interactions other than work.
What I interpret from this is that change in energy = change in work done.
however it is not the case but it’s the NEGATIVE change in work done.
Why must it be negativ... | {
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"openwebmath_score": null,
"tags": "thermodynamics, work, conventions, adiabatic",
"url": null
} |
conformal-field-theory, wess-zumino-witten
$$
\left[j^{(i)}_{m}, j^{(j)}_{n}\right] = \sum_{l} f^{ijl} j^{l}_{m+n} + k m \delta^{ij} \delta_{m,-n}
$$
where j with superscripts are the new fields. This is the affine Kac-Moody algebra structure. Accepting the argument of [1] that conserved currents of dimension $(1,0)$... | {
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"openwebmath_score": null,
"tags": "conformal-field-theory, wess-zumino-witten",
"url": null
} |
rviz
Below is the snippet from python file-
def __init__(self):
freq = 50
self.rate = 1.0
rospy.loginfo("Publishing frequency = "+str(freq))
fname = rospy.get_param("~file", None)
if fname is None:
rospy.logerr("Must provide private param '~file'")
rospy.signal_shutdown("No CSV fil... | {
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"id": 24748,
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"lm_name": null,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "rviz",
"url": null
} |
nomenclature, stereochemistry, chirality
Title: M/P nomenclature for axial-chirality
Synthesis and Chiral Resolution of C3-Symmetric Tribenzotriquinacenes, Eur. J. Org. Chem. 2016, Early View article
DOI: 10.1002/ejoc.201600890 | {
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"tags": "nomenclature, stereochemistry, chirality",
"url": null
} |
-
Download the notebook pertaining to your first link. There's the code – eldo Jul 18 '14 at 11:52
PolarPlot[Evaluate@Table[n+ChebyshevT[n,t/Pi-1],{n,0,20,2}],{t,0,2Pi}] – Simon Woods Jul 18 '14 at 12:01
@eldo Thank you! I did not see this link. – Frank Jul 18 '14 at 12:14
@SimonWoods Thank you very much! That's all I ... | {
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"lm_q1_score": 0.9811668728630677,
"lm_q1q2_score": 0.8067047466459687,
"lm_q2_score": 0.8221891392358015,
"openwebmath_perplexity": 1054.4196318152826,
"openwebmath_score": 0.5922289490699768,
"ta... |
evolution, bioinformatics
Title: If we introduce any disease or deadly effect to a large group of living things, will such a group be able to develop a resistance? Like for instance, introducing cancer or radiation,
to a large group of insects/animals that can reproduce very quickly,
would it result in the surviving p... | {
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"openwebmath_score": null,
"tags": "evolution, bioinformatics",
"url": null
} |
# Math Help - word problem.
1. ## word problem.
hi ! im having a difficult time answering this word problem.
"Alvin set out from a certain point and travelled at the rate of 6 kph. After Alvin had gone for two hours, Ben set on to overtake him and went 4km the first hour, 5 km the second hour, 6 km the third hour an... | {
"domain": "mathhelpforum.com",
"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9822877049262134,
"lm_q1q2_score": 0.8817950394695,
"lm_q2_score": 0.8976952832120991,
"openwebmath_perplexity": 654.912072111246,
"openwebmath_score": 0.8460566997528076,
"tags": ... |
Case 2. $k = 1$
Then $a_n = a_{n-1} + r$ and the solution is simply $a_n = rn + a_0$.
• I don't see how the second line follows from the first – mrnovice Apr 9 '17 at 0:20
• @mrnovice because for relations like $b_n = 2b_{n-1}$ we now the form of general solution, right? It is $b_n = 2^nb_0$ (as was written in the or... | {
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"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.987375052204446,
"lm_q1q2_score": 0.8352624543645327,
"lm_q2_score": 0.8459424334245618,
"openwebmath_perplexity": 169.14487005923758,
"openwebmath_score": 0.9586666822433472,
"tag... |
algorithms, optimization, strings, subsequences
Title: Find long connected similar subsequences in two given sequences I'm looking for pointers to algorithms which will find long connected similar subsequences which two given sequences have in common. For example, in case of two strings:
abcaabbaabUVWXYZ
UVWXeYZababab... | {
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"id": 7333,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "algorithms, optimization, strings, subsequences",
"url": null
} |
# what is the domain of $\frac{1}{\sqrt{x-[x]}}$ where [x] denotes the greatest integer function and find the range .
what is the domain of $$\frac{1}{\sqrt{x-[x]}}$$ where [x] denotes the greatest integer function and find the range .
My approach :
since [x] greatest integer function is discontinuous on all integra... | {
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"lm_q1_score": 0.9799765546169711,
"lm_q1q2_score": 0.8424503203538117,
"lm_q2_score": 0.8596637505099168,
"openwebmath_perplexity": 288.2925318734247,
"openwebmath_score": 0.9280517101287842,
"tag... |
function f00(x), which is called the second derivative of f.In diï¬erential notation this is written Stationary Points. The second derivative of a function at a point , denoted , is defined as follows: More explicitly, this can be written as: Definition as a function. Notation: here we use fâ x to mean "the partial ... | {
"domain": "baroknikrajinou.cz",
"id": null,
"lm_label": "1. YES\n2. YES\n\n",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9833429624315189,
"lm_q1q2_score": 0.8129412267577049,
"lm_q2_score": 0.8267117962054048,
"openwebmath_perplexity": 687.9443177457151,
"openwebmath_score": 0.9352886080741882,
... |
java, performance
if ((noteObjectFromUser.getStartDateTimestamp() != null) &&
(databaseNoteObject.getStartDateTimestamp() == null)) {
if (!noEdit) {
gantt = true;
}
noEdit = true;
} else if ((noteObjectFromUser.getStartDateTimestamp() == null) &&
(database... | {
"domain": "codereview.stackexchange",
"id": 19019,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "java, performance",
"url": null
} |
13. Yes , so the if-then statement is correct , by the way i am not sure if this can help in this situation :
The max. power of a given prime $p$ denoted by $a$ such that $p^a | \binom{2n}{n}$ can be obtained by this formula ( without a formal proof , could be wrong ) : $\frac{ 2S(n) - S(2n) }{p-1}$ where $S(n)$ is th... | {
"domain": "mathhelpforum.com",
"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9790357561234475,
"lm_q1q2_score": 0.8137187602592636,
"lm_q2_score": 0.8311430457670241,
"openwebmath_perplexity": 287.184333684854,
"openwebmath_score": 0.9760760068893433,
"tags... |
c++, socket, tcp
}
exit(EXIT_SUCCESS);
}
// main_client.cpp
#include "tcp_helpers.h"
int main() {
// establish connection to server and get socket file descriptor.
int port = 20000;
auto ip = "127.0.0.1";
int socket1_fd = TCP_Helpers::init_client(ip, port);
std::cout << "connected." << std::e... | {
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"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "c++, socket, tcp",
"url": null
} |
python, python-3.x, strings, security
Test code execution with imported os
>>> safe_format('{os.system("dir")}')
''
Test no stack trace
>>> safe_format('{0/0}')
''
Test acceptable fstring
>>> safe_format('{6 * 6}')
'36'
'''
if any(re.search(danger, st) for danger in DANGEROUS_... | {
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"id": 32034,
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"lm_name": null,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "python, python-3.x, strings, security",
"url": null
} |
## Area of Function Problems
The answer will be given in either radians or degrees, depending on the mode selected on the calculator, and will always be in the standard angular ranges given in Equations 26a–c. There are 6 inverse trigonometric functions, so why are there only three integrals? The reason for this is th... | {
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"id": null,
"lm_label": "1. YES\n2. YES\n\n",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9891815491146486,
"lm_q1q2_score": 0.8040733481989324,
"lm_q2_score": 0.8128673133042217,
"openwebmath_perplexity": 306.4771374397998,
"openwebmath_score": 0.8048574924468994,
"tags": ... |
quantum-mechanics, open-quantum-systems
The motivation I guess is that we often assume that the bath on its own thermalizes, and that the interaction between the system and bath is weak compared to their individual Hamiltonians.
As far as the fixed energy difference, in the final expression for the Liouvillean / Lindb... | {
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "quantum-mechanics, open-quantum-systems",
"url": null
} |
performance, sql, postgresql
Title: Enforcing a constraint that a user may vote on each post at most once I have the following table in a PostgreSQL database:
creator uuid not null,
post uuid not null,
type text not null,
content text not null,
constraint check_type check
(type = ... | {
"domain": "codereview.stackexchange",
"id": 35813,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "performance, sql, postgresql",
"url": null
} |
gazebo, ros2, camera
<!-- Define gazebo sensor -->
<gazebo reference="${sensor_reference}_virtual_frame_link">
<sensor name="${sensor_reference}" type="${sensor_type}" >
<always_on>${sensor_always_on}</always_on>
<update_rate>${sensor_update_rate}</update_rate>
<camera name="${sensor_... | {
"domain": "robotics.stackexchange",
"id": 38154,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "gazebo, ros2, camera",
"url": null
} |
condensed-matter, solid-state-physics, material-science, graphene
Note how this is analogous to cimply assembling a chain of atoms, in the spirit of the tight-binding model - small hopping between degenerate states eventually transforms into a band, when the number of atoms becomes very large. | {
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"openwebmath_score": null,
"tags": "condensed-matter, solid-state-physics, material-science, graphene",
"url": null
... |
Recall that two vectors are orthogonal if and only if their inner product is zero. You are incorrect in asserting that if the columns of $Q$ are orthogonal to each other then $QQ^T = I$; this follows if the columns of $Q$ form an orthonormal set (basis for $\mathbb{R}^n$); orthogonality is not sufficient. Note that "$Q... | {
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"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.949669373100424,
"lm_q1q2_score": 0.8267795557353557,
"lm_q2_score": 0.8705972616934408,
"openwebmath_perplexity": 153.14601995436138,
"openwebmath_score": 0.9142773151397705,
"tag... |
boj67cihglr909s sqm3sreznegkg tzcc0n40yccvg1 xvw61wry02shll j6lpb29yoq to60yeynpx 4oiqz7t1da chmhm77tth q7kdxrne7x4dql u83m0p791zr at0cku0oesz4aem tutlr1fars0y x0zq7pavd5ebku2 ncs1x0oe9mor1 2q1bl4bf8ayy mshdvwxqkejlb khzkx84d90gete 8mi9r1oe96usn4u a4wmm7e5jbdd l1tzxl5fc4t ccg384go0jc u4afn5fdn4 yqdacs7naiwml j5frbyuire... | {
"domain": "officinariusomarghera.it",
"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9883127447581986,
"lm_q1q2_score": 0.8400373512134626,
"lm_q2_score": 0.849971181358171,
"openwebmath_perplexity": 789.9586885075794,
"openwebmath_score": 0.7282557487487793,
... |
embryology
Title: What is a zygote? During fertilization, the nuclear membrane of the pro-nucleus of the ovum and sperm degenerate. Is the cell is stage called a zygote?
After the dissolution, mitosis occurs and two cells are formed.Or is the cell is stage called a zygote?
I'm confused as i knew a zygote was single-ce... | {
"domain": "biology.stackexchange",
"id": 1217,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "embryology",
"url": null
} |
organic-chemistry, reaction-mechanism, nucleophilic-substitution, ethers
Title: Acidic cleavage of ether with a 2° alkyl group I know that an ether with a 3° alkyl group and a 1° alkyl group is cleaved by $\mathrm{S_N1}$ mechanism to give a tertiary alkyl halide and a 1° alcohol.
And an ether with a two 1° alkyl group... | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "organic-chemistry, reaction-mechanism, nucleophilic-substitution, ethers",
"ur... |
c#, .net, linq
switch (replacer.Replace(key, string.Empty))
{
case "nature":
predicateTemp = c => c.Typologies.NatureDemande == localValue;
break;
case "departementCode":
predicateTemp = c => c.Geographies.Departeme... | {
"domain": "codereview.stackexchange",
"id": 4031,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "c#, .net, linq",
"url": null
} |
c, security, cryptography, cli, openssl
Title: OpenSSL PBKDF2-HMAC-SHAx proof of concept I have regrettably been away from C programming for a very long time, so I'd like to get a quick code review of a first proof of concept, before I get too far into adding capabilities, using the getopt library for arguments, alter... | {
"domain": "codereview.stackexchange",
"id": 6331,
"lm_label": null,
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"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "c, security, cryptography, cli, openssl",
"url": null
} |
$$[(p \land \lnot q) \lor \lnot p] \lor [(q \land \lnot r) \lor r] \qquad \qquad \qquad \quad \ \ \text{(Associative and Commutative Laws)}$$
$$[(p \lor \lnot p) \land (\lnot q \lor \lnot p)] \lor [(q \lor r) \land (\lnot r \lor r)] \quad \quad \text{(Distributive Laws)}$$
$$[ \mathbf T \land (\lnot q \lor \lnot p)] ... | {
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"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9702399086356109,
"lm_q1q2_score": 0.8167728371513572,
"lm_q2_score": 0.8418256452674008,
"openwebmath_perplexity": 175.50237460330155,
"openwebmath_score": 0.9285430312156677,
"ta... |
special-relativity, spacetime, metric-tensor, distance, invariants
If you want to see a Pythagorean triple in the Minkowski case,
you can use my "Relativity on Rotated Graph Paper" method.
You can construct other triples on the diagram of the elastic-collision at https://www.physicsforums.com/insights/relativity-rota... | {
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"openwebmath_score": null,
"tags": "special-relativity, spacetime, metric-tensor, distance, invariants",
"url": null... |
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