text stringlengths 49 10.4k | source dict |
|---|---|
physical-chemistry, bond, spectroscopy, ir-spectroscopy
It is indeed "reluctant" to absorb the photon, but that is not because of the stiffness of the bond. If the bond is stiffer ($k$ is larger), then it simply needs a photon of shorter wavelength (as the vibrational frequency $\omega = \sqrt{k/\mu}$ will be larger).... | {
"domain": "chemistry.stackexchange",
"id": 8483,
"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": "physical-chemistry, bond, spectroscopy, ir-spectroscopy",
"url": null
} |
context-free, formal-grammars
Title: Reversing a List from a Context-Free Grammar Let's say I have a struct_declaration_list of the following type. How do I reverse it?
struct_declaration_list
: struct_declaration
| struct_declaration_list struct_declaration
;
P.S. Sorry I don't know the exact name of thi... | {
"domain": "cs.stackexchange",
"id": 3639,
"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": "context-free, formal-grammars",
"url": null
} |
ros-melodic, pcl, ubuntu, pointcloud, ubuntu-bionic
Title: Conversion from Point Cloud (PCL) to PointCloud2 (ROS) not showing result on RViz
Hello, I followed this tutorial using PCL libraries to perform the conversion from point cloud into a ROS readable message PointCloud2. After compiling and running the example e... | {
"domain": "robotics.stackexchange",
"id": 33172,
"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": "ros-melodic, pcl, ubuntu, pointcloud, ubuntu-bionic",
"url": null
} |
newtonian-mechanics, waves, harmonic-oscillator, oscillators, viscosity
This creates an equation of motion for transverse vibrations (where $w$ is transverse 1D displacement) in the simplest form of:
$ρw_{tt} = (σ + \frac{T}{A})w_{xx}$
Where $T$ is base tension, $A$ is cross sectional area.
In a Kelvin-Voigt damper, y... | {
"domain": "physics.stackexchange",
"id": 99171,
"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": "newtonian-mechanics, waves, harmonic-oscillator, oscillators, viscosity",
"url":... |
kinematics, computational-physics, notation, projectile, software
$$
x\tan\theta = y + \frac{g x^2}{2 v_0^2} \sec^2\theta = y + \frac{g x^2}{2 v_0^2} \left(1+ \tan^2\theta\right).
$$
We have a quadratic equation for $\tan\theta$
$$
\tan^2\theta -\frac{2 v_0^2}{g x} \tan\theta +\frac{2 v_0^2 y}{g x^2} +1 = 0.
$$
T... | {
"domain": "physics.stackexchange",
"id": 77762,
"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": "kinematics, computational-physics, notation, projectile, software",
"url": null
... |
gazebo, kinect, rviz, pointcloud
Originally posted by Saphrosit on ROS Answers with karma: 197 on 2012-06-19
Post score: 2
Original comments
Comment by Yannis on 2012-07-03:
I am having exactly the same problem, and cannot figure out what is wrong. Some other answers say that it could be a problem of graphic card, wh... | {
"domain": "robotics.stackexchange",
"id": 9841,
"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, kinect, rviz, pointcloud",
"url": null
} |
neural-networks, machine-learning, convolutional-neural-networks, keras
As you can see, there is a time series of data points and some statistics derived from that time series that have been appended to the input data stream. So, in the figure, the augmented time series input consists of the measurements themselves as... | {
"domain": "ai.stackexchange",
"id": 2107,
"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": "neural-networks, machine-learning, convolutional-neural-networks, keras",
"url": null
... |
ros
Originally posted by JP on ROS Answers with karma: 95 on 2013-10-08
Post score: 0
Original comments
Comment by BennyRe on 2013-10-08:
Is your header file located in the src folder or in include/?
Comment by JP on 2013-10-09:
Hey, it was in the src folder.
Comment by BennyRe on 2013-10-09:
Are you linking the both... | {
"domain": "robotics.stackexchange",
"id": 15794,
"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": "ros",
"url": null
} |
beginner, html, css
<li><a href="chopin.html">3</a></li>
<li><a href="schoenberg.html">4</a></li>
<li><a href="bernstein.html">5</a></li>
<li><a href="reich.html">6</a></li>
<li><a href="davis.html">7</a></li>
<li><a href="buckley.html">8</a></li>
<li><a href="moby.html"... | {
"domain": "codereview.stackexchange",
"id": 12861,
"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": "beginner, html, css",
"url": null
} |
navigation, ekf, odometry, ros-kinetic, jackal
Title: Jackal odometry producing large covariances?
I'm getting exploding covariance readings (along the diagonal) when echoing my /odometry/filtered topic on a jackal robot
header: seq: 51936 stamp:
secs: 1533236107
nsecs: 579915762 frame_id: "odom" chil... | {
"domain": "robotics.stackexchange",
"id": 31451,
"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": "navigation, ekf, odometry, ros-kinetic, jackal",
"url": null
} |
performance, c, multithreading, openmp, openssl
/* Build timestamp */
#define build_time __TIME__
#define build_date __DATE__
/* Calculate log to the base 2 using GCC's bit scan reverse intrinsic */
__inline__ unsigned int clc_log2(const unsigned int num) {
return ((num <= 1) ? 0 : 32 - (__builtin_clz(num - 1)));... | {
"domain": "codereview.stackexchange",
"id": 6170,
"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, c, multithreading, openmp, openssl",
"url": null
} |
hamiltonian-formalism, perturbation-theory, resonance, complex-systems, integrable-systems
However, we can show that this exact reduction is generally not
possible, and formal series for canonical transformations reducing a
system to normal form generally diverge.
Hope this helps. | {
"domain": "physics.stackexchange",
"id": 96689,
"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": "hamiltonian-formalism, perturbation-theory, resonance, complex-systems, integrable... |
To compute Euclidean distance, you can use the R base dist() function, as follow: dist.eucl <- dist(df.scaled, method = "euclidean") Note that, allowed values for the option method include one of: “euclidean”, “maximum”, “manhattan”, “canberra”, “binary”, “minkowski”. > Hello, > I am quite new to R.(in fact for the fir... | {
"domain": "saecof.com",
"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"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,... |
python, object-oriented, python-3.x, playing-cards
In main() you can write:
if player_move: instead of if player_move is True: because they are equivalent.
else instead of elif player_move is False:, this makes more sense and is shorter.
In dealer_hit(self), you can simply write else instead of elif score >= 17:, th... | {
"domain": "codereview.stackexchange",
"id": 27756,
"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": "python, object-oriented, python-3.x, playing-cards",
"url": null
} |
For each $x\in\mathbb{R}$ let $\mathscr{U}_x$ be a non-principal ultrafilter on $A_x$, and let $$\mathscr{V}_x=\{V\subseteq\mathbb{Q}:\exists U\in\mathscr{U}_x[U\subseteq V]\}\;;$$ it’s not hard to check that $\mathscr{V}_x$ is a non-principal ultrafilter on $\mathbb{Q}$. Now suppose that $\mathscr{V}_x=\mathscr{V}_y$ ... | {
"domain": "stackexchange.com",
"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9904406012172462,
"lm_q1q2_score": 0.8097589579423176,
"lm_q2_score": 0.817574478416099,
"openwebmath_perplexity": 60.037182153758536,
"openwebmath_score": 0.9606351256370544,
"tag... |
Also in such kind of triangles might be useful to equate the areas to find the length of some line segment, for example area of ABC=1/2*AC*BD=1/2*AB*BC (for more check: triangles-106177.html, geometry-problem-106009.html, mgmat-ds-help-94037.html, help-108776.html)
(1) AD = 2.5. Sufficient.
(2) DC = 10. Sufficient.
H... | {
"domain": "gmatclub.com",
"id": null,
"lm_label": "1. Yes\n2. Yes\n\n",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 1,
"lm_q1q2_score": 0.805632181981183,
"lm_q2_score": 0.805632181981183,
"openwebmath_perplexity": 2167.3403536037813,
"openwebmath_score": 0.7999711036682129,
"tags": null,
"url": ... |
beginner, ruby, file-system, console
def dir_header(pattern)
100.times { |i| !(i == 99) ? print('-') : puts }
pattern_message = (pattern == '*') ? '' : "matching \"#{ pattern }\""
puts
puts "Listing entries in #{ File.basename(Dir.pwd) }#{ pattern_message }"
puts
puts 'Index Entry'
100.times { |... | {
"domain": "codereview.stackexchange",
"id": 12903,
"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": "beginner, ruby, file-system, console",
"url": null
} |
2) If we draw NO number '2' card then $$p_2=\frac{28^{\underline{8}}}{30^{\underline{8}}}$$
3) If we draw NO number '1' card by the $5$th draw AND NO number '2' card then, similarly to case 1), $$p_3=\frac{1}{30^{\underline{8}}}\left(26^{\underline{8}}+(3+3)\cdot 26^{\underline{7}}+3\cdot 2\cdot 26^{\underline{6}}\rig... | {
"domain": "stackexchange.com",
"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9877587261496031,
"lm_q1q2_score": 0.8528225950999307,
"lm_q2_score": 0.8633916082162403,
"openwebmath_perplexity": 236.12312727635154,
"openwebmath_score": 0.76022869348526,
"tags... |
java
Title: Determine if simple arithmetic expression is valid This looks very messy to me, and I'm fairly new to java, so I don't know what data structures could have helped me achieve the same result more efficiently. I just went ahead and brute-forced all possible failing scenarios:
Could this be further optimized ... | {
"domain": "codereview.stackexchange",
"id": 28414,
"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",
"url": null
} |
python, python-3.x, time-limit-exceeded, bioinformatics
I think this listofbases = ["A", "C", "G", "T"] should be a global variable since it can be used multiple places.
Your for a in listofbases: for b in listofbases: can be done with a builtin itertools.product
Don't concat strings, but use the better "str".format()... | {
"domain": "codereview.stackexchange",
"id": 31670,
"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": "python, python-3.x, time-limit-exceeded, bioinformatics",
"url": null
} |
a row wise and column wise sorted matrix, Create a matrix with alternating rectangles of O and X, Inplace (Fixed space) M x N size matrix transpose | Updated, Minimum cost to sort a matrix of numbers from 0 to n^2 â 1, Count entries equal to x in a special matrix, Row-wise common elements in two diagonals of a square... | {
"domain": "christopher-phillips.com",
"id": null,
"lm_label": "1. Yes\n2. Yes\n\n",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9759464506036182,
"lm_q1q2_score": 0.9146675521834541,
"lm_q2_score": 0.9372107984180245,
"openwebmath_perplexity": 491.08047682015183,
"openwebmath_score": 0.678838074207... |
This is just matrix multiplication in disguise. Specifically, if you identify $(a_1,a_2,a_3)$ with the matrix $\begin{pmatrix}a_1 & a_3 \\ 0 & a_2\end{pmatrix}$, these operations are the usual matrix operations: $$\begin{pmatrix}a_1 & a_3 \\ 0 & a_2\end{pmatrix}+\begin{pmatrix}b_1 & b_3 \\ 0 & b_2\end{pmatrix}=\begin{p... | {
"domain": "stackexchange.com",
"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9766692325496974,
"lm_q1q2_score": 0.8586355863518633,
"lm_q2_score": 0.8791467548438126,
"openwebmath_perplexity": 526.2422588281735,
"openwebmath_score": 0.979472815990448,
"tags... |
ros-kinetic
process[svo-1]: started with pid [19891]
create vo_node
[ WARN] [1563654227.665696970]: Cannot find value for parameter: svo/publish_img_pyr_level, assigning default: 0
[ WARN] [1563654227.666169164]: Cannot find value for parameter: svo/publish_every_nth_img, assigning default: 1
[ WARN] [1563654227.66651... | {
"domain": "robotics.stackexchange",
"id": 33488,
"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": "ros-kinetic",
"url": null
} |
The other two lines are reflections of each other in the $$x$$-axis; these can be found by noting that a homothety that takes the point $$(0,0)$$ to $$(2,0)$$ and $$(2,0)$$ to $$(3,0)$$ will map the first circle to the second, and the center of this homothety will be a fixed point of this map. | {
"domain": "stackexchange.com",
"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.977022630759019,
"lm_q1q2_score": 0.8556637121481672,
"lm_q2_score": 0.8757869932689566,
"openwebmath_perplexity": 185.1788240251181,
"openwebmath_score": 0.8656613230705261,
"tags... |
compilers, interpreters, theory
Note that the role that the interpreter plays in the case of a mixed-mode execution engine, namely providing fast startup, and also potentially collecting information and providing fallback capability may alternatively also be played by a second JIT compiler.
This is how the second gene... | {
"domain": "cs.stackexchange",
"id": 19511,
"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": "compilers, interpreters, theory",
"url": null
} |
quantum-mechanics, operators, wavefunction, commutator, wavefunction-collapse
My attempt at a solution
I see that, after measuring $A$ or $B$, the system will collapse to one of the eigenstates of these operators. For instance, if we measure $A$ in first place, then the state at $t_0$ sill be $\Psi(x,t_0)=\psi_a(x)$, ... | {
"domain": "physics.stackexchange",
"id": 70728,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "quantum-mechanics, operators, wavefunction, commutator, wavefunction-collapse",
... |
linear-systems
Title: Alternative to BIBO stability of a system In DSP textbooks a system is stable in the BIBO (Bounded-Input, Bounded Output) sense if and only if every bounded input sequence produces a bounded output sequence. After stating this definition stable always means BIBO-stable.
I'd like to know if there ... | {
"domain": "dsp.stackexchange",
"id": 2439,
"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": "linear-systems",
"url": null
} |
evolution, mitochondria, eukaryotic-cells
Title: Why do mitochondria have a phospholipid bilayer? So, a thought came up and I couldn't find all that much info online, so I thought I'd ask some professionals here!
The endosymbiont theory states that: mitochondria came to be ingested by bigger prokaryotic cells about 1.... | {
"domain": "biology.stackexchange",
"id": 8300,
"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": "evolution, mitochondria, eukaryotic-cells",
"url": null
} |
ros
Descartes seems to think it's okay for the tool to flip wildly occasionally despite not using AxialSymmetricPt objects
this is most likely an IK issue. Descartes relies on IK plugins to provide it with solutions. If the IK acts up, things are going to go wrong.
Comment by gvdhoorn on 2017-06-14:
re: visualising a... | {
"domain": "robotics.stackexchange",
"id": 27986,
"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": "ros",
"url": null
} |
electromagnetism, electric-circuits, electrical-resistance, power
Instead what happens is that with a constant $R$, both $V$ and $I$ will always change simultaneously and in the same ratios. That is what Ohm's Law states.
This also answers your other question. If you have a fixed resistance $R$ that you know to be con... | {
"domain": "physics.stackexchange",
"id": 77083,
"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": "electromagnetism, electric-circuits, electrical-resistance, power",
"url": null
... |
A: Yes, every single possible case. A homomorphism is always defined by its generators.
All the example is saying is that you cannot just take some map of the generators and hope that it is a homomorphism.
Three more examples:
• Any map $\phi: \mathbb{Z}_n\rightarrow\mathbb{Z}$, $1\mapsto x$, for $x\neq 0$, is not a... | {
"domain": "stackexchange.com",
"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9664104953173166,
"lm_q1q2_score": 0.8325995694288951,
"lm_q2_score": 0.861538211208597,
"openwebmath_perplexity": 357.7875724019331,
"openwebmath_score": 0.9616946578025818,
"tags... |
# Linear combinations of three-dimensional vectors
There is a three-dimensional vector $v$. Show that $v$ can be expressed as a linear combination of $v_1$, $v_2$, and $v_3$, where $v_1 = \begin{pmatrix} 1 \\ 1 \\ 1 \end{pmatrix}$, $\quad v_2 = \begin{pmatrix} -1 \\ 1 \\ 1 \end{pmatrix}$, $\quad v_3 = \begin{pmatrix} ... | {
"domain": "stackexchange.com",
"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9859363750229257,
"lm_q1q2_score": 0.8128670072886012,
"lm_q2_score": 0.8244619306896956,
"openwebmath_perplexity": 98.11179064638729,
"openwebmath_score": 0.8496699333190918,
"tag... |
• One almost trivial comment: If the image of $\pi_1(S^1)$ in $\pi_1(M)$ happens to land in the center of $\pi_1(M)$, then $\pi_1(M)$ is nilpotent. Aug 14 '20 at 16:57 | {
"domain": "stackexchange.com",
"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9852713891776498,
"lm_q1q2_score": 0.8055327486743871,
"lm_q2_score": 0.8175744850834648,
"openwebmath_perplexity": 125.52985713975177,
"openwebmath_score": 0.9670451283454895,
"ta... |
general-relativity, spacetime, differential-geometry, metric-tensor, coordinate-systems
Title: Comparing two spacetimes Consider two spacetimes with the same manifold $M$ but distinct metric $g,g'$. How do I identify a point $p \in M$ in two spacetimes? Specifically, if I give the coordinates of the point in one space... | {
"domain": "physics.stackexchange",
"id": 48445,
"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": "general-relativity, spacetime, differential-geometry, metric-tensor, coordinate-sy... |
calibration, camera-calibration
Title: How can I get extrinsic camera parameters from the ROS camera_calibration package
I want to get more a more accurate point cloud and uv-mapping for the Softkinetic Depthsense by calibrating the intrinsic and extrinsic parameters of the depthsense using the ROS camera_calibration... | {
"domain": "robotics.stackexchange",
"id": 21071,
"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": "calibration, camera-calibration",
"url": null
} |
ros, compile, image-view
/usr/include/c++/4.6/ostream:167:7: note: no known conversion for argument 1 from ‘cv::Size’ to ‘long int’
/usr/include/c++/4.6/ostream:171:7: note: std::basic_ostream<_CharT, _Traits>::__ostream_type& std::basic_ostream<_CharT, _Traits>::operator<<(long unsigned int) [with _CharT = char, _T... | {
"domain": "robotics.stackexchange",
"id": 21018,
"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": "ros, compile, image-view",
"url": null
} |
while a negative sign with a coefficient value shows the negative (indirect, opposite) relationship between the variables. Can the US House/Congress impeach/convict a private citizen that hasn't held office? How was I able to access the 14th positional parameter using $14 in a shell script? Proof of Key Properties of t... | {
"domain": "thaiplus.net",
"id": null,
"lm_label": "1. YES\n2. YES\n\n",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9766692264378963,
"lm_q1q2_score": 0.8095990184965997,
"lm_q2_score": 0.8289388019824947,
"openwebmath_perplexity": 550.7072396013566,
"openwebmath_score": 0.6638980507850647,
"tags... |
electromagnetism, lagrangian-formalism, maxwell-equations
F_{\mu \nu} = \partial_{\mu} A_{\nu} - \partial_{\nu} A_{\mu}
$$
for some $A_{\mu}$.
In the language of differential forms, this is a statement about the 2nd de Rham cohomology of the Minkowski space being trivial: for any $2$-form $F$ such that $dF = 0$, there... | {
"domain": "physics.stackexchange",
"id": 69462,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "electromagnetism, lagrangian-formalism, maxwell-equations",
"url": null
} |
kinematics, acceleration, estimation
Title: What's the formula for the speed of an accelerating car? I am trying to find a formula that closely describes the speed of an accelerating car over time. I have found many graphs on the internet, but so far no formulae to generate them. For my purposes I will assume that the... | {
"domain": "physics.stackexchange",
"id": 99467,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "kinematics, acceleration, estimation",
"url": null
} |
ecology, population-biology
Title: What does 'per capita births and deaths' mean? My book says,
If in a pond there are 20 lotus plants last year and through reproduction 8 new plants are added, taking the current population to 28, we calculate the birth rate as 8/20 = 0.4 offspring per lotus per year.
..
If 4 ind... | {
"domain": "biology.stackexchange",
"id": 8152,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "ecology, population-biology",
"url": null
} |
is: - an even number – the power is a positive number, - an odd number – the power is a negative number. Can we simplify $$\sqrt{−25}$$? Simplify and add. We write $$\sqrt{169}=13$$. Roots can also be expressed as fractional exponents. Aug 2011 3 0. See also on this page a square root chart 1 to 100. Examples: You have... | {
"domain": "com.br",
"id": null,
"lm_label": "1. YES\n2. YES\n\n",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9637799441350252,
"lm_q1q2_score": 0.8210950293208885,
"lm_q2_score": 0.8519528076067262,
"openwebmath_perplexity": 636.2207573290367,
"openwebmath_score": 0.8082594871520996,
"tags": nul... |
homework-and-exercises, newtonian-mechanics
Title: Bead on a rod fixed at its center I had an exam problem that I couldn’t figure out, wondering how to solve it.
My issue here is I don’t know how to treat the mass and the rod. If I separate them out, how would I write a force diagram for them? Perhaps for the rod, I n... | {
"domain": "physics.stackexchange",
"id": 57856,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "homework-and-exercises, newtonian-mechanics",
"url": null
} |
c, multithreading, linux, status-monitoring
pthread_mutex_destroy(&total_lock); //destroy mutex lock
pthread_cond_destroy(&ok_to_add);
if (systemUtilization > (long double) cpus) { //sanity check for HT
systemUtilization = (long double) cpus;
}
if (sum2 > (long double) cpus) {
sum2 = (... | {
"domain": "codereview.stackexchange",
"id": 42971,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "c, multithreading, linux, status-monitoring",
"url": null
} |
# Can you write this operation in matrix notation?
Consider the matrix $$A$$ and column vector $$b$$ where,
$$A = \begin{bmatrix}1 & 2\\3 & 4\end{bmatrix}$$ and $$b = \begin{bmatrix}1\\3\end{bmatrix}$$
In the R statistics software, the the code A*b performs element-wise multiplication of the columns in $$A$$ with th... | {
"domain": "stackexchange.com",
"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9893474879039229,
"lm_q1q2_score": 0.8065482220599504,
"lm_q2_score": 0.8152324960856175,
"openwebmath_perplexity": 259.1826040318646,
"openwebmath_score": 0.7982490658760071,
"tag... |
c++, linked-list, c++17
if (node == tail) // insert at back of list
{
tail = new_node;
return;
}
new_node->next->prev = new_node;
}
/* Delete a node from the list. */
template<typename T>
void DLinkedList<T>::delete_node(DNode<T> *&node)
{
if (empty())
throw std::out_of_rang... | {
"domain": "codereview.stackexchange",
"id": 30498,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "c++, linked-list, c++17",
"url": null
} |
# How is rearranging $56\times 100\div 8$ into $56\div 8\times 100$ allowed by the commutative property?
So according to the commutative property for multiplication:
$$a \times b = b \times a$$
However this does not hold for division
$$a \div b \neq b \div a$$
Why is it that in the following case:
$$56 \times 100... | {
"domain": "stackexchange.com",
"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9591542817548989,
"lm_q1q2_score": 0.815253487032457,
"lm_q2_score": 0.8499711699569787,
"openwebmath_perplexity": 499.37521788811097,
"openwebmath_score": 0.8990843296051025,
"tag... |
d = \sqrt { 53\, } \approx 7.28 d = \sqrt { 53\, \approx! Section we look at how we can use such a formula to fi nd area... \Approx 7.28 d = \sqrt { 53\, } \approx 7.28 d = \sqrt { 53\ }. Registered trademark of sophia Learning, LLC for example, the formula for the route the graph Writing a for. To organize the informat... | {
"domain": "newmedia1.net",
"id": null,
"lm_label": "1. Yes\n2. Yes\n\n",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9830850832642354,
"lm_q1q2_score": 0.8982217628298645,
"lm_q2_score": 0.9136765251766503,
"openwebmath_perplexity": 1134.5942273666617,
"openwebmath_score": 0.45044904947280884,
"t... |
algorithms, complexity-theory
$V' = \{v_{i,k}\mid i,k \in \{1, …, n\}\} \cup \{s, t\}$;
$E' = \{(v_{i,k}, v_{j,k+1})\mid k\in \{1, …, n-1\} \text{ and }(v_i, v_j)\in E\}\cup \{(s, v_{i,1})\mid i\in \{1, …, n\}\}\cup \{(v_{i,n}, t)\mid i\in \{1, …, n\}\}$;
for $e = (u, v)\in E'$, $f(e) = n^i$ if $v=v_{i,k}$ and $f(e) =... | {
"domain": "cs.stackexchange",
"id": 20824,
"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, complexity-theory",
"url": null
} |
ros, gazebo, rviz, plugin, librviz
However, I cannot visualize the image for fixed frame camera_rig_calibration.
Any ideas, how I could further debug? Thanks in advance for any help provided!
What could be other reasons for the CameraInfo/Image not showing up? I can provide further code if desired.
Regards,
Sascha
Or... | {
"domain": "robotics.stackexchange",
"id": 23773,
"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": "ros, gazebo, rviz, plugin, librviz",
"url": null
} |
python, roman-numerals
resulting_numeral = ''
for num in base_numbers:
while arabic_number >= num:
arabic_number -= num
resulting_numeral += base_conversions[num]
return resulting_numeral
def from_roman(roman_numeral):
if not roman_numeral_validator.match(roman_numeral):
... | {
"domain": "codereview.stackexchange",
"id": 21506,
"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": "python, roman-numerals",
"url": null
} |
roslaunch, rosservice
Title: Calling a rosservice with args from a launch file
Hello there ! Hope u are doing well,
I'm trying to call a rosservice directly from a launch file, i used this questions to write my own node and it turned out like that:
<node pkg="rosservice" type="rosservice" name="chg_ctrl" args="call -... | {
"domain": "robotics.stackexchange",
"id": 37447,
"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": "roslaunch, rosservice",
"url": null
} |
trapezoids and. Planner geometry, a four-sided shape that has opposite sides of a regular polygon to any one of sides! Strategy: how to prove this rule about the opposite sides are.... All angles are ___________ if ABCD is a rhombus are also equal to nearest. The quadrilateral is a parallelogram is a closed two-dimensi... | {
"domain": "80port.info",
"id": null,
"lm_label": "1. Yes\n2. Yes",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9732407168145569,
"lm_q1q2_score": 0.8023999162130441,
"lm_q2_score": 0.8244619263765707,
"openwebmath_perplexity": 796.2912575936527,
"openwebmath_score": 0.771286129951477,
"tags": nul... |
java, performance, sql, jdbc, oracle
This should not be required:
while(isFound){
isFound=false;
String randomSalt=createRandomString(); //creates salt/random string
ResultSet rs = stmt.executeQuery("SELECT * FROM mvUser where salt="+randomString);
//check if salt is unique
while (rs.next()) {
isF... | {
"domain": "codereview.stackexchange",
"id": 34850,
"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, sql, jdbc, oracle",
"url": null
} |
javascript, jquery, html, css
var containerCssPaddingTop = $(__ctrl).css('padding-top');
var containerCssPaddingRight = $(__ctrl).css('padding-right');
var containerCssPaddingBottom = $(__ctrl).css('padding-bottom');
var containerCssPaddingLeft = $(__ctrl).css('padding-left');
$(__ctrl... | {
"domain": "codereview.stackexchange",
"id": 2862,
"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": "javascript, jquery, html, css",
"url": null
} |
c++
As an aside, I'd note that this produces results that aren't reversible--when you see a 'z' or 'Z' in the output, you have no way of knowing whether the input was a 'y'/'Y' or a 'z'/'Z'. I'd guess the real intent is that an input of 'z'/'Z' should be transformed to 'A', but that doesn't seem to be included in your... | {
"domain": "codereview.stackexchange",
"id": 31158,
"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++",
"url": null
} |
html5, twitter-bootstrap
I have included a Bootply link to the example.
comment post example on Bootply About your HTML
Removing all the div elements that seem to be needed only for presentation, you have this markup:
<h2 class="page-header">Comments</h2>
<section class="comment-list">
<!-- First Comment -->
<figure... | {
"domain": "codereview.stackexchange",
"id": 11435,
"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": "html5, twitter-bootstrap",
"url": null
} |
ros, differential-drive
/opt/ros/groovy/include/ros/publisher.h:112:7: instantiated from ‘void ros::Publisher::publish(const M&) const [with M = int]’
/home/d4n/sdc2130/src/auto.cpp:204:29: instantiated from here
/opt/ros/groovy/include/ros/message_traits.h:143:36: error: request for member ‘__getDataType’ in ... | {
"domain": "robotics.stackexchange",
"id": 15077,
"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": "ros, differential-drive",
"url": null
} |
# Rigorous definition of a limit
Suppose that $L$ is a real number and $f$ is a real-valued function defined on some interval $(b, \infty)$. We say that $\displaystyle{\lim_{x \to \infty} f(x) =L}$ if for every positive real number $\epsilon$, there is a real number $M$ such that if $x>M$ then $|f(x) -L| < \epsilon$.
... | {
"domain": "stackexchange.com",
"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9825575142422756,
"lm_q1q2_score": 0.8390183937464386,
"lm_q2_score": 0.8539127548105611,
"openwebmath_perplexity": 151.20016980308716,
"openwebmath_score": 0.9413112998008728,
"ta... |
polynomials
Title: Do you know of a brute-force algorithm for optimizing polynomial expressions? For instance, given the polynomial expression $xy + x + y + 1$ it will output $(x+1)(y+1)$.
Thanks! "Brute-force" in the context of factoring polynomials may involve factoring of integers, which is a hard problem. Factorin... | {
"domain": "cs.stackexchange",
"id": 2726,
"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": "polynomials",
"url": null
} |
python, algorithm
Title: Given an array find any three numbers which sum to zero Looking for optimizations and cleaner, more pythonic ways of implementing the following code.
#Given an array find any three numbers which sum to zero.
import unittest
def sum_to_zero(a):
a.sort(reverse=True)
len_a = len(a)
... | {
"domain": "codereview.stackexchange",
"id": 3423,
"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": "python, algorithm",
"url": null
} |
python, beginner, algorithm, strings, regex
Test 8: 1e is an invalid number.
--------------------------------------------------
Test 9: e3 is an invalid number.
--------------------------------------------------
Test 10: 6e-1 is a valid number.
--------------------------------------------------
Test 11: 99e2.5 is a... | {
"domain": "codereview.stackexchange",
"id": 36267,
"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": "python, beginner, algorithm, strings, regex",
"url": null
} |
Conditions. Two-Dimensional Space (a) Half-Space Defined by. So far, we have supplied 2 equations for the n+2 unknowns, the remaining n equations are obtained by writing the discretized ODE for nodes. This way I should be able to define a neumann condition at the boundary. Boundary conditions can be set the usual way. ... | {
"domain": "ionoale.it",
"id": null,
"lm_label": "1. YES\n2. YES\n\n",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9833429599907709,
"lm_q1q2_score": 0.8062363333225964,
"lm_q2_score": 0.8198933293122506,
"openwebmath_perplexity": 605.967414960971,
"openwebmath_score": 0.8164872527122498,
"tags": ... |
reference-request, computability, typed-lambda-calculus
Title: Is simply typed lambda calculus equivalent to primitive recursive functions It's well known that the computation models untyped lambda calculus and $\mu$-recursive function are equivalent in terms of computability (in fact they are both Turing complete.) I... | {
"domain": "cstheory.stackexchange",
"id": 4033,
"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": "reference-request, computability, typed-lambda-calculus",
"url": null
} |
quantum-mechanics, quantum-entanglement, reflection, quantum-interpretations, wavefunction-collapse
In the case of the two-slit interferometer, the observer detects the position ("state") of each photon that strikes a screen. That "detection" (according to the MW view) is not really an observation of what the photon'... | {
"domain": "physics.stackexchange",
"id": 51059,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "quantum-mechanics, quantum-entanglement, reflection, quantum-interpretations, wave... |
php, performance, mysql, sql
Title: php script to retrieve enum values from sql table I have an sql table with multiple fields and 4 of them are enums. I wrote a script that runs thought the table and retrieve the enums and put them in a 2 dimension array.
Unfortunately this script is extreamly slow and I can't fix it... | {
"domain": "codereview.stackexchange",
"id": 3425,
"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": "php, performance, mysql, sql",
"url": null
} |
slam, navigation, gmapping
Title: Where am I in the map?
How do I get the occupancy value from the map at my robots position? The map is increasing dynamically as my robot moves around, right? Hence the (0,0) index of the data array may shift as my map expands. What I want is the occupancy value at the very position ... | {
"domain": "robotics.stackexchange",
"id": 5848,
"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": "slam, navigation, gmapping",
"url": null
} |
newtonian-mechanics, classical-mechanics, rotational-dynamics, reference-frames, coordinate-systems
Title: Different coordinate system as opposed to different reference frame I'm having a hard time getting the difference between the two. In Euler's equations of rotating bodies for example, we have:
$$ \mathbf{\dot{L}}... | {
"domain": "physics.stackexchange",
"id": 70819,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "newtonian-mechanics, classical-mechanics, rotational-dynamics, reference-frames, c... |
But this is obviously wrong, since it looks like the $$ln$$ should have a $$\frac{1}{2}$$ in front of it, so something must be wrong with my trig-sub on $$I_1$$? I know it's a lot to read but I just wanted to put it step by step to see if there's some dumb algebraic mistake I made. If anyone can help, thanks a ton in a... | {
"domain": "stackexchange.com",
"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9653811591688146,
"lm_q1q2_score": 0.822459185335694,
"lm_q2_score": 0.8519528038477824,
"openwebmath_perplexity": 111.069682210686,
"openwebmath_score": 0.9153443574905396,
"tags"... |
thermodynamics, ideal-gas, reversibility
Title: Validity of the equation $dQ=CdT$ in different cases I know this question may be too simple so I apologise for that but nonetheless very necessary. In my class we have defined the heat as $$\delta Q=CdT$$ with $C$ the heat capacity, but I'm unsure if it works for non ide... | {
"domain": "physics.stackexchange",
"id": 98669,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "thermodynamics, ideal-gas, reversibility",
"url": null
} |
newtonian-mechanics, rotational-dynamics, moment-of-inertia
Title: How to calculate the moment of inertia of a cut out portion? So, I have watched a lot of videos on YouTube, whereby if there is a portion cut out from a particular shape (mind you the that the shape is more often that not symmetric), then the moment of... | {
"domain": "physics.stackexchange",
"id": 60081,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "newtonian-mechanics, rotational-dynamics, moment-of-inertia",
"url": null
} |
urdf, transform-listener, robot-state-publisher, tf2
ros::NodeHandle node;
tf::TransformListener listener;
ros::Rate rate(10.0);
while (node.ok()){
tf::StampedTransform transform;
try{
listener.lookupTransform("/base_link", "/sonar0_link",
ros::Time(0), transfor... | {
"domain": "robotics.stackexchange",
"id": 6307,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "urdf, transform-listener, robot-state-publisher, tf2",
"url": null
} |
• Edit * Some "sweeping up," by request, to show that any $f$ satisfying the conditions of the problem (continuity, functional equation) is differentiable at $x=c$, for every $c$. Fix $c$, set $a = |c|$, and consider $$f(x) \int_{a+10}^{a+20} f(y)\, dy = \int_{a+10}^{a+20} f(x) f(y) \,dy = \int_{a+10}^{a+20} \psi( x^2 ... | {
"domain": "stackexchange.com",
"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9830850827686585,
"lm_q1q2_score": 0.8970023859512638,
"lm_q2_score": 0.9124361682155117,
"openwebmath_perplexity": 214.29778855004562,
"openwebmath_score": 0.9482557773590088,
"ta... |
The obvious (and maximal) candidate for the 3d object is $$\{\,(x,y,z)\in\Bbb R^3\mid (y,z)\in A_1, (x,z)\in A_2, (x,y)\in A_3\,\}$$ obtained by intersecting the maximal sets that give one of the three projections each. The question is if the projections of this maximal set are as desired. This is the case for the firs... | {
"domain": "stackexchange.com",
"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9799765557865638,
"lm_q1q2_score": 0.818754277099837,
"lm_q2_score": 0.8354835350552604,
"openwebmath_perplexity": 336.53826491531186,
"openwebmath_score": 0.7989408373832703,
"tag... |
9. Let $z=\cos \theta + i \sin \theta$ this means $z = e^{i\theta}$.
Thus, $\frac{z^2-1}{z^2+1} = \frac{e^{2i\theta}-1}{e^{2i\theta}+1} = \frac{e^{i\theta} - e^{-i\theta}}{e^{i\theta} + e^{-i\theta}} = \frac{\sinh (i\theta)}{\cosh (i\theta)} = \frac{i\sin \theta}{\cos \theta} = i\tan \theta$
10. Originally Posted by ... | {
"domain": "mathhelpforum.com",
"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.973240714486111,
"lm_q1q2_score": 0.806756993963136,
"lm_q2_score": 0.8289388040954684,
"openwebmath_perplexity": 5130.352521213218,
"openwebmath_score": 0.9119564890861511,
"tags"... |
thermodynamics, entropy, chemical-potential
The $\delta Q\ $ is incomplete derivative therefore, integration of this will depends on the reaction path even though the reaction path is quasi-static but, we can do line integration along a quasi-static reaction path, $C$. We denote ${Q}_{C}$ as the result of this line i... | {
"domain": "physics.stackexchange",
"id": 62770,
"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": "thermodynamics, entropy, chemical-potential",
"url": null
} |
quantum-mechanics, quantum-information, density-operator
Let us first provide a counterexample for the case of three outcomes. To this end, let $p_1=p_2=\tfrac12$ and $p_3=0$, and let
\begin{align}
\rho_1 &= \left(\begin{matrix}\tfrac13\\&\tfrac23\end{matrix}\right)\ ,
\\
\rho_2 &= \left(\begin{matrix}\tfrac23\\&\tf... | {
"domain": "physics.stackexchange",
"id": 29528,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "quantum-mechanics, quantum-information, density-operator",
"url": null
} |
javascript
The while loop can be exchanged for an if condition, or dropped entirely if there are no expected undefined entries in the input array (in that case, also remove the superfluous num++) by changing the for loops condition to num < numArr.length - 1.
There is no need to push every partial result into an array... | {
"domain": "codereview.stackexchange",
"id": 28241,
"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": "javascript",
"url": null
} |
ros, gazebo, wxwidgets
Title: roslaunch gazebo_ros symbol lookup error
Hi
I am setting up gazebo on Ubuntu 12.04 with ROS Hydro. Installation is done using debs.
I have following output on lauching willowgarage world.
/opt/ros/hydro/share/gazebo_ros/launch$ roslaunch willowgarage_world.launch
... logging to /home/ni... | {
"domain": "robotics.stackexchange",
"id": 16809,
"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": "ros, gazebo, wxwidgets",
"url": null
} |
c#, asynchronous, thread-safety, queue
var promiseSet = promise.TrySetResult(item);
if (promiseSet) {
break;
}
}
}
}
I wrote unit tests and it seems to work fine. I think there might be a rare race condition that happens in the following scenario, but I have not bee... | {
"domain": "codereview.stackexchange",
"id": 31421,
"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#, asynchronous, thread-safety, queue",
"url": null
} |
Finding Fourier coefficients for a square wave If you're seeing this message, it means we're having trouble loading external resources on our website. then Bessel's inequality becomes an equality known as Parseval's theorem. 005 (b) The Fourier series on a larger interval Figure 2. It uses real DFT, that is, the versio... | {
"domain": "peterjackson.it",
"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9886682454669814,
"lm_q1q2_score": 0.8281282595168402,
"lm_q2_score": 0.8376199633332891,
"openwebmath_perplexity": 497.33143749852866,
"openwebmath_score": 0.9017105102539062,
"tags... |
between two variables as a straight line. x^m = y m Log x = Log y m = Log y / Log x The table shows exponent m for distances of 1. 3. The amplitude is given, so we need to calculate the linear mass density of the string, the angular frequency of the wave on the string, and the speed of the wave on the string. The dimen... | {
"domain": "diapindia.org",
"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.98201378740596,
"lm_q1q2_score": 0.8366294014433552,
"lm_q2_score": 0.8519528057272544,
"openwebmath_perplexity": 472.06879802409924,
"openwebmath_score": 0.7215793132781982,
"tags": n... |
Note that is a vector, and so is y. So when we multiply one by another, it doesn't matter what the order is (as long as the dimensions work out). So we can further simplify:
Recall that here is our unknown. To find where the above function has a minimum, we will derive by and compare to 0. Deriving by a vector may fee... | {
"domain": "bbsmax.com",
"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9748211568364099,
"lm_q1q2_score": 0.8144470301535537,
"lm_q2_score": 0.8354835391516133,
"openwebmath_perplexity": 6188.887535797298,
"openwebmath_score": 0.9360277652740479,
"tags": nul... |
electrostatics, electric-fields, gauss-law
Title: Electric fields in/around conductors So according to my notes, the field inside a conductor is zero. But what, exactly, is meant by inside?
I think we are in electrostatics for the purpose of this question.
The reason it is zero is because all the electrons are pushed ... | {
"domain": "physics.stackexchange",
"id": 2809,
"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": "electrostatics, electric-fields, gauss-law",
"url": null
} |
qiskit, programming
It doesn't seem to be the case that the order in which circuits are executed necessarily matches the order in which they are specified. However, you should be able to find the mechanism that dicates execution / submission order by following the IBMQJobManager.run bread trail that I've started to la... | {
"domain": "quantumcomputing.stackexchange",
"id": 4000,
"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": "qiskit, programming",
"url": null
} |
standard-model, quantum-chromodynamics, quarks
Title: Could the fractional model of Quarks electric charge turn out to be false? The delta baryons (also called delta resonances) are a family of subatomic hadron particles which have the symbols $\Delta^{++}$, $\Delta^{+}$, $\Delta^{0}$, and $\Delta^{−}$ and electric ch... | {
"domain": "physics.stackexchange",
"id": 4685,
"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": "standard-model, quantum-chromodynamics, quarks",
"url": null
} |
c#, xamarin
AddAttachmentsToRequest(ticketToSend);
}
catch (WhateverException e) {
HandleError(e);
return false;
}
return true;
}
And so on, note that you may not need to always keep methods so short but it's the target you should set. Same applies to all the other methods then I won... | {
"domain": "codereview.stackexchange",
"id": 21948,
"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#, xamarin",
"url": null
} |
clustering, k-means
Title: How to get data back into two separate audio files after successfully applying kmeans clustering on an audio file? Okay so I wrote a very simple python code to read a wav file, get the mfcc features and then use kmeans clustering on the features. The hello.wav file has two different people s... | {
"domain": "datascience.stackexchange",
"id": 3127,
"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": "clustering, k-means",
"url": null
} |
javascript, mathematics, ecmascript-6, number-systems
Title: Convert numbers from base X to base Y I recently wrote a piece of code to convert between two bases of X, (Where 26 > X > 0). I was mighty proud that I did this. And then I started wondering, am I using modern coding conventions/practices?
The code can be fo... | {
"domain": "codereview.stackexchange",
"id": 30363,
"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": "javascript, mathematics, ecmascript-6, number-systems",
"url": null
} |
java, optimization, design-patterns, tic-tac-toe, ai
} else if(((buttons[4].getText().equals("X") && buttons[5].getText().equals("X"))
|| (buttons[0].getText().equals("X") && buttons[6].getText().equals("X")))
&& buttons[3].getText().equals("")
){
buttons[3].setText("O"... | {
"domain": "codereview.stackexchange",
"id": 12118,
"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, optimization, design-patterns, tic-tac-toe, ai",
"url": null
} |
mathematics, terminology-and-notation, computational-models
More precisely, they look at the Schrödinger time evolution of a $L$-dimensional subspace under the assumption that it is periodic with period $\tau$. Then, given a basis of this subspace, one can ask how much is this basis rotated after time $\tau$? This is ... | {
"domain": "quantumcomputing.stackexchange",
"id": 3799,
"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": "mathematics, terminology-and-notation, computational-models",
"url": nul... |
So, the matrix for T with respect to B equals
[-1 1 0]
[0 0 2]
[0 0 1].
b) Find a basis for kerT and hence write down dim(kerT).
As you've correctly stated, we may express the transformation in the form
$$\displaystyle A_T=\left[ \begin{array}{ccc} -1 & 1 & 0 \\ 0 & 0 & 2 \\ 0 & 0 & 1 \end{array} \right]$$ | {
"domain": "mathhelpboards.com",
"id": null,
"lm_label": "1. YES\n2. YES\n\n",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9808759654852756,
"lm_q1q2_score": 0.857361347124793,
"lm_q2_score": 0.874077230244524,
"openwebmath_perplexity": 240.52229068328862,
"openwebmath_score": 0.9151639938354492,
... |
c++, algorithm, image, opencv, openmp
cv::Mat sobel_transform(const cv::Mat& input)
{
cv::Mat finalImage = cv::Mat::zeros(input.size(), input.type());
#pragma omp parallel for
for (int j = 0; j < input.rows-2; ++j) {
for (int i = 0; i < input.cols-2; ++i) {
// applay karnel in x directi... | {
"domain": "codereview.stackexchange",
"id": 30843,
"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++, algorithm, image, opencv, openmp",
"url": null
} |
18. freckles
so... notice that every term on top has a common factor of h and the denominator also has a common factor h
19. freckles
$f'(x)=\lim_{h \rightarrow 0} \frac{h(2ax+ah+b)}{h(1)}$
20. haleyelizabeth2017
Oh!
21. freckles
we can write as: $f'(x)=\lim_{h \rightarrow 0} \frac{h}{h} \cdot \frac{2ax+ah+b}{1}... | {
"domain": "openstudy.com",
"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.980280867283954,
"lm_q1q2_score": 0.8190085263532226,
"lm_q2_score": 0.8354835371034368,
"openwebmath_perplexity": 2438.9954109018654,
"openwebmath_score": 0.7395755052566528,
"tags": ... |
algorithms, arrays
Title: Counting subarrays that satisfy either of two conditions We have an array of integers $a[]$, with each $|a[i]| \leq 10^{6}$, $size(a)\leq10^{5}$, and $a[i]-a[i-1]\leq100$.
Then we define the term range as a subarray $[x,y]$ of the array $a[]$, $x \lt y$.
We need to find total number of range... | {
"domain": "cs.stackexchange",
"id": 1577,
"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, arrays",
"url": null
} |
plates, and C is the capacitance with the dielectric material between the plates, and with A and d remaining constant. Principles: Gauss' law. 1 Introduction A capacitor is a device that stores electric charge. 64 •• A parallel-plate capacitor has plates separated by a distance d. Capacitance of parallel plate capacito... | {
"domain": "agenzialenarduzzi.it",
"id": null,
"lm_label": "1. YES\n2. YES\n\n",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9481545304202039,
"lm_q1q2_score": 0.8040044772205128,
"lm_q2_score": 0.847967764140929,
"openwebmath_perplexity": 531.7615776063614,
"openwebmath_score": 0.6449436545372009,
... |
circle, sector of a circle, and ellipse. Geometry Dictionary, Geometry encyclopedia, illustrated Geometry dictionary, Geometry glossary, Geometry terms, on-line dictionary, Primary, Middle and High School. Alternatively, try our free Centroid Calculator. In the case of two-dimensional objects shown below, the hyperplan... | {
"domain": "scapinspa.it",
"id": null,
"lm_label": "1. YES\n2. YES\n\n",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.991152646485103,
"lm_q1q2_score": 0.8033083220547793,
"lm_q2_score": 0.8104789155369047,
"openwebmath_perplexity": 538.4268003249031,
"openwebmath_score": 0.6964551210403442,
"tags"... |
thermodynamics, temperature, entropy, calculus, chemical-potential
I don't see any egregious conceptual errors. There is at least one typo that I pointed out in a comment - it's possible that there are others, but I have not followed the steps that you took precisely. You seem to be running into a mess -
to give you... | {
"domain": "physics.stackexchange",
"id": 66584,
"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": "thermodynamics, temperature, entropy, calculus, chemical-potential",
"url": null... |
biochemistry, botany, plant-physiology, photosynthesis
What are typical characteristics of different plants in this regard? I.e., how do common species of plants manage their C consumption before (and after) the development of leaves? There are quite a few questions and thoughts in there, I'll try to cover them all:
F... | {
"domain": "biology.stackexchange",
"id": 5466,
"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": "biochemistry, botany, plant-physiology, photosynthesis",
"url": null
} |
gazebo, simulation, simulator-gazebo
Originally posted by hsu with karma: 5780 on 2011-03-29
This answer was ACCEPTED on the original site
Post score: 0
Original comments
Comment by mcevoyandy on 2012-07-26:
Does this still apply in fuerte? Trying to use Link::GetRelativeForce(), GetWorldForce(), or Joint::GetForce ... | {
"domain": "robotics.stackexchange",
"id": 5227,
"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, simulation, simulator-gazebo",
"url": null
} |
computer-architecture, parallel-computing
Title: How on-chip multithreading prevents cache misses from stalling a processor pipeline? On-chip multithreading is considered a powerful performance enhancer technique that enables a processor to handle multiple threads at the same time. If I got the idea right, multithread... | {
"domain": "cs.stackexchange",
"id": 19494,
"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": "computer-architecture, parallel-computing",
"url": null
} |
Subsets and Splits
No community queries yet
The top public SQL queries from the community will appear here once available.