text stringlengths 1 1.11k | source dict |
|---|---|
c++
“Doing a thing” usually means you want a function, not a constructor. I think that’s especially important when you’re doing a thing that might fail, because then you can give the user the option of avoiding exceptions in cases where they can’t afford them. In other words, you could do:
class serinfo
{
private:
... | {
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kinect, turtlebot, ros-fuerte
One more thing I am using the kinect for windows and not xbox360 kinect.
Now I am new to ROS and dont know what to do next. Please help me with this problem so that I can start with building some maps and do SLAM.
Originally posted by Vegeta on ROS Answers with karma: 340 on 2012-10-17
P... | {
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"tags": "kinect, turtlebot, ros-fuerte",
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electricity, electrons, diffusion
the bonding is the same for all atoms, they are regularly arranged and solid Silicon is therefore a crystal. So we say that Silicon has a valence of 4. And by extension we call the electrons in those combined $sp_3$ orbitals valence electrons and the corresponding energy level, valenc... | {
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"tags": "electricity, electrons, diffusion",
"url": null
} |
ros, navigation, tf-broadcaster, robot-localization, transform
I am also publishing the transform between base_link and imu via a ßstatic_transform_publisher. On running the ekf_localization_node the odometry/filered topic displays the odometry messages with frame_id as odom and child_frame_id as "base" but the trasfo... | {
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} |
% \begin{align} % y_{1}(x) &= m x + b \\ % y_{2}(x) &= m x + b \\ % \end{align} %
In terms of linear algebra, look at the problem in terms of $\color{blue}{range}$ and $\color{red}{null}$ spaces.
The linear system for two equations is % \begin{align} % m_{1} x - y &= b_{1} \\ % m_{2} x - y &= b_{1} \\ % \end{align} w... | {
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"openwebmath_score": 1.0000097751617432,
"tag... |
sql, sql-server
DROP TABLE #exchrates
The original code (see the updated code above):
DECLARE @currency_to char(3) = 'EUR'
-- Build the exchange-rate rows for the target currency in the variable.
-- The cur1 and cur2 can be switched in some rows; hence the UNION ALL.
DECLARE @exchrates AS TABLE (
date_from date ... | {
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If $k$ is a multiple of $3$, then the statement is obviously true. Then suppose that $k$ is not a multiple of $3$. Since $k$ and $3$ are coprime, $$k^2 \equiv 1\pmod 3$$ by Euler's theorem. Then $$k^3+3k^2+2k \equiv 3k\equiv 0. \pmod 3$$ Therefore $k^3+3k^2+2k$ is divisible by $3$.
-
Euler's theorem seems a bit overki... | {
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dft
return (result / nElem);
}
This is how I define my input:
std::vector<double> vInput;
for( int i = 0; i < 10; ++i )
{
vInput.push_back ( sin( i * M_PI / 5 ) );
}
And this is the output I did not expect for t=0.5, t=1.5, etc.:
inverseDft( vCoeffs, 0. ); // okay (0.000000, -0.000000)
inverseDft( vCoeffs, 0.5... | {
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fourier-transform, frequency-spectrum, frequency, frequency-domain, fourier-series
The figure below of a different example shows a digital spectrum as an "unwrapped view" extending from plus or minus infinity. This demonstrates the aliases that would exist for an arbitrary spectrum that exists with a spectral density ... | {
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"tags": "fourier-transform, frequency-spectrum, frequency, frequency-domain, fourier-series",
... |
orbital-mechanics, radio-astronomy, planetary-science, lunar-eclipse, planetary-systems
For example, on Dec 31 2028, there will be a total lunar eclipse on the same day as the greatest western elongation of Mercury.
So that said, Mercury would be in line-of-sight of the eclipsed spacecraft orbiting the moon, as it wou... | {
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# 3. Problems
## 3.1. Linear Interpolation
Draw the points in the table and use linear interpolation to find an estimate of z for a=99.5. Show your work using the system of equations method and the similar triangles method.
a z
90 20
95 22
100 33
interp1([90,95,100],[20,22,33],99.5)
## 3.2. 1-D Interpolati... | {
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"openwebmath_score": 0.57448655366897... |
analytical-chemistry, nmr-spectroscopy
It is the axis of rotation that transforms each carbon of a certain colour onto its counterpart of the same colour. Thus, all carbons of a single colour are homotopic. Homotopic atoms are always chemically identical and thus will give a signal with the same chemical shift. Chemic... | {
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ros, sensor-msgs, image, publish
Originally posted by Holzroller on ROS Answers with karma: 62 on 2014-12-11
Post score: 0
Original comments
Comment by Cyril Jourdan on 2014-12-11:
If you don't especially need sensor_msgs, I would use image_transport instead to publish images, it works fine.
Comment by Holzroller on ... | {
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nuclear-physics
Title: are there any resource for the Abundance ratio of nuclear isotopes in early earth The abundance ratio of a nuclide is the ratio of the number of atoms of one isotope to the number of atoms of another isotope of the same chemical element.
It may also refer to the ratio of one isotope to the tota... | {
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u= 5301513033929379567323543522 v= 3060829977251436882311426881
m= 441792752827448297276961960 n= 382603747156429610288928360
diff= 59189005671018686988033600 sqrt= 7693439131560
441792752827448297276961960 + 382603747156429610288928360 = 824396499983877907565890320
824396499983877907565890320 / 7693439131560 = ... | {
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"openwebmath_score": 0.8137239813804626,
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be a scalar matrix all! Java scalar multiplication: is a scalar matrix allow the user to enter number... In R by that matrix matrix remains the same multiplication: is a scalar matrix translation, dictionary. Anglų, prancūzų, vokiečių ir rusų kalbomis Computing Toolbox™ of an identity matrix is said be!, and the matrix... | {
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"lm_q1_score": 0.9869795075882267,
"lm_q1q2_score": 0.9183432365488522,
"lm_q2_score": 0.9304582612793112,
"openwebmath_perplexity": 773.2012659838158,
"openwebmath_score": 0.7514483332633972,
"tags... |
particle-physics, standard-model, heisenberg-uncertainty-principle, radioactivity, absolute-units
All this experimental data is then compared with the theoretical data which is based on the Standard Model and the agreements have been found to be very good to a high degree of precision.
The accuracy to which the experi... | {
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"tags": "particle-physics, standard-model, heisenberg-uncertainty-principle, radioactivity,... |
homework-and-exercises, electrostatics, electric-fields, charge
The electric field produced by a charge distribution depends on its shape and you lose information when you approximate it as a point charge. More precisely, what you get corresponds to the first term in the multipole expansion of the potential. | {
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"tags": "homework-and-exercises, electrostatics, electric-fields, charge",
"url": null
} |
slam, navigation, ros-kinetic, rtabmap, pointcloud
Thanku | {
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"tags": "slam, navigation, ros-kinetic, rtabmap, pointcloud",
"url": null
} |
quantum-gate, circuit-construction, pauli-gates, hadamard
The technique above allows us to reduce the number of resulting controlled gates by exploiting identities such as $XZ=-iY$
$$
\begin{align}
(I_1\otimes X_2)\circ C_1H_2 &=
\begin{bmatrix}X&\\& X\end{bmatrix}
\begin{bmatrix}I&\\& H\end{bmatrix}\\ &=
\begin{bmatr... | {
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"tags": "quantum-gate, circuit-construction, pauli-gates, hadamard",
"url": null
... |
mobile-robot, kalman-filter
Title: How to convert/transform robot local frame to global frame to use in Kalman Filter? I'm currently working on the iRobot Create 2 platform using a RaspberryPi (Python) and ROS. I have an indoor navigation/ GPS system, which can provide me with x,y coordinates within its coordinate sys... | {
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"tags": "mobile-robot, kalman-filter",
"url": null
} |
javascript, object-oriented, typescript, classes, cache
constructor(cacheDurationInMinutes: number) {
this.cacheDurationInMilliseconds = cacheDurationInMinutes * 60 * 1000;
}
private getCache(): Cache | undefined {
const data = localStorage.getItem('portfolio');
if (!data) {
return;
}
... | {
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python, performance, sudoku
You then iterate over filled_puzzles. But iteration does not need a list, being Iterable is sufficient (duck typing, it's all about supplying the right methods, you treat object by what they can do, not what they are). Remove list for a free speed-up.
bool
You do a pair of times:
return Tru... | {
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"tags": "python, performance, sudoku",
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ros, gazebo, joint, urdf
Title: Gazebo mimic joints property
Hi.
I'm trying to "link" two joints with the mimic joint property. I readed that this property isn't suported officialy yet but there is in the code of Gazebo and can be used.
I readed here: http://www.ros.org/doc/api/urdf/html/joint_8h_source.html and foun... | {
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quantum-mechanics, hilbert-space, hamiltonian, unitarity
$$ \exp(\hat{O}) = \sum_{n=0}^{\infty} \frac{\hat{O}^n}{n!}$$
So your question boils down to: what are the exponentials of a projection operator?
We immediately see that $(i\omega t |e\rangle\langle e|)^n = (i\omega t |e\rangle\langle e|)\cdot(i\omega t |e\rangl... | {
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"tags": "quantum-mechanics, hilbert-space, hamiltonian, unitarity",
"url": null
} |
special-relativity, speed-of-light, observers
Title: Observed speed of a receding light source Let’s say there’s a planet 4 light years away from Earth and we send a rocket ship towards that planet at 99.9% light speed. We stay behind on Earth and watch the rocket ship travel towards the other planet.
Eventually we sh... | {
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"tags": "special-relativity, speed-of-light, observers",
"url": null
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cosmology, experimental-physics, neutrinos, beyond-the-standard-model, fine-tuning
Title: Estimate of neutrino masses from the values of $\Delta m_{21}^2$ and $\Delta m_{13}^2$ only! The blog here says that
The measured mass differences between the eigenstates are $\Delta m_{21}^2=7.5\times 10^{-5} {\rm eV}^2$ and $... | {
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"tags": "cosmology, experimental-physics, neutrinos, beyond-the-standard-model, fine-tuning... |
# Does there exist a matrix $A$ such that $\|Ax\|_{\infty} = \|x\|_1$?
$$A \in \mathbb R^{2\times2}, x \in \mathbb R^{2\times1}$$
Does there exist matrix $$A$$: $$\|Ax\|_{\infty} = \|x\|_1$$, how to prove it for any $$x$$, or just find one example matrix $$A$$?
• Is $A$ fixed? Is $x$ fixed? Please use that "for all"... | {
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such that:
$$(a^m)^q = e \tag{6}$$
By $$10.G.4$$ with (6):
$$n \ \big|\ mq$$
$$l \lt mq$$
$$\text{lcm}(m,n) \leq mq$$
Isolate q:
$$\text{lcm}(m,n)/m \leq q \tag{8}$$
So (9) must be true.
That's how I approached it. If anyone notices any issues, I'd be happy to know about them.
Even if it is considered correct... | {
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"openwebmath_score": 0.6025456786155701,
"ta... |
c++, computational-geometry
The idea of the algorithm is as follows: if the closest points between the extending lines belong to the segments then it is clearly the answer.
Otherwise, one needs to consider only the endvertices of the segments. For each of these 4 points, search for closest point in the other segment. ... | {
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gazebo, ros2, webots, ros-humble, urdf
Moreover, the webots_ros2 wiki page contains explanations on the examples and how to use them. There are also more advanced tutorials that cover a range of topics, including how to set up an existing ROS 2 robot in Webots. These pages can be accessed at https://github.com/cyberbo... | {
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"tags": "gazebo, ros2, webots, ros-humble, urdf",
"url": null
} |
electrochemistry
Thus, should concentration polarisation cause a decrease in the performance/efficiency of a galvanic cell over time and would this be shown with a decrease of voltage/current through the cell? Or does voltage and current remain the same throughout a galvanic cell reaction? There are two different fact... | {
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"tags": "electrochemistry",
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fluid-dynamics, biology, propulsion
There are two sources of resistance when moving through water. First, flowing water generates friction forces. These are called viscosity. Second, a moving object must push water out of its way. The reaction forces push the object back. These are called inertial forces.
In most case... | {
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"tags": "fluid-dynamics, biology, propulsion",
"url": null
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classical-mechanics, forces, friction
Edit: All books consider the friction to act first. I want to know the reason behind this. It depends on how the string is set up, of course. | {
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ros2, roslaunch
Original comments
Comment by .zero on 2020-08-06:
Thank you!
But why does it work that way?
Comment by lukicdarkoo on 2020-08-08:
Maybe somebody with a better understanding may be more suitable for this question.
But, the default_value parameter is an array (
https://github.com/ros2/launch/blob/d8b12df... | {
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ros, roslaunch, xml
Originally posted by eghan on ROS Answers with karma: 51 on 2017-08-13
Post score: 0
Original comments
Comment by gvdhoorn on 2017-08-13:
This is not a question, this is a dump of the console output of roslaunch. Please see Guidelines for asking a question and update your post.
Comment by eghan on... | {
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"openwebmath_score": null,
"tags": "ros, roslaunch, xml",
"url": null
} |
c#, .net, generics, stack, queue
if (Count != 0)
{
var top = this.Peek();
if (item.Height > top.Height || item.Weigth > top.Weigth)
{
throw new InvalidOperationException("The item is too big");
}
}
b... | {
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"openwebmath_score": null,
"tags": "c#, .net, generics, stack, queue",
"url": null
} |
java, android
@Override
protected void onPostExecute(String result) {
new LongPolling().execute();
}
}
Is it the right approach for the long polling, or do you want to suggest a better approach? Also, a IntentService starts when you turn on the phone to run that code, would be better to use a Servic... | {
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"openwebmath_score": null,
"tags": "java, android",
"url": null
} |
genome, cancer, pathway, correlation, modelling
Supervised learning What you will do is look at gene expression and train it against your phenotype of interest (cancer and recovery from cancer). The training 'target' is the drug the mice are being treated with for each given data set, obviously they'll be a "untreated... | {
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"openwebmath_score": null,
"tags": "genome, cancer, pathway, correlation, modelling",
"url": null
} |
evolution, zoology, dinosaurs
Title: Has evolution made a mistake with prehistoric animals? Let me start this by saying I have very limited knowledge in biology and evolution.
However, when visiting museums and watching documentary movies, I always get impression dinosaurs (and other animals in "dinosaur era") are ver... | {
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"tags": "evolution, zoology, dinosaurs",
"url": null
} |
quantum-mechanics, quantum-field-theory, operators, time, second-quantization
Title: Is there a natural operator that is canonically conjugate to the Hamiltonian? As is well known, the Heisenberg uncertainty principle states that the position and momentum satisfy an uncertainty relation, which follows from the canonic... | {
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"tags": "quantum-mechanics, quantum-field-theory, operators, time, second-quantization",
... |
c++, performance, memory-management, vectors, reinventing-the-wheel
void pop_back() // Remove the last element of the vector..
{
if(vector_size)
--vector_size;
} // Doesn't actually deallocate the element block (for performance)..
size_t size() const
{
return vector_size... | {
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"tags": "c++, performance, memory-management, vectors, reinventing-the-wheel",
"url": n... |
javascript, css, user-interface, google-maps
This only works AFTER I have accessed the hamburger menu at least once. If I run the script before then, it has no effect.
The script simply uses the same overlay that google uses to dim the map while the menu is open. But it changes it to be "on" even when you aren't acces... | {
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"tags": "javascript, css, user-interface, google-maps",
"url": null
} |
9. Major thankies for the article.Much thanks again. Cool.
10. Thanks for the marvelous posting! I truly
enjoyed reading it, you are a great author. I will always bookmark your blog and may come back
down the road. I want to encourage yourself to continue your great
work, have a nice morning!
11. I do not even unders... | {
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"lm_q1q2_score": 0.8039363919125515,
"lm_q2_score": 0.8128673201042493,
"openwebmath_perplexity": 1451.0651637830686,
"openwebmath_score": 0.46121031045913696,
... |
So the idea of momentum is to model the possibility of letting that heavy ball roll instead of directing it by the steepest descent at every point. So there's an extra term in steepest descent, the momentum term that accelerates. OK. So Friday is the day. Good. See you then. | {
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"lm_q1q2_score": 0.81704979314677,
"lm_q2_score": 0.8267117876664789,
"openwebmath_perplexity": 595.9249727745299,
"openwebmath_score": 0.7817188501358032,
"tags": null,
... |
algorithms, arrays
Title: Algorithm to check the distance between integers I have the next problem, and I was wondering whether it exists a way to solve it without having to iterate around all the array in the worst case.
I have a sorted array of pairwise distinct integers, say $[1,2,4,5,7,8]$
I need to know if there ... | {
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"tags": "algorithms, arrays",
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} |
lattice
It seems like we can use this logic to deduce that SVP is also in coNP. Since we know that the Gram-Schmidt orthogonalization of the basis gives us a lower bound of the shortest vector.
It seems like we can provide a certificate that is the basis of the lattice and its Gram-Schmidt orthogonalization will be ab... | {
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"tags": "lattice",
"url": null
} |
ros, rosbag, topic, transform
Title: record the topic of a special node between topics with same name
I did not find the answer of this question anywhere. I rosrun openni_camera and openni_tracker simultaneously. I would like to use rosbag record /tf but only for openni_tracker topic but the problem is that openni_ca... | {
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"tags": "ros, rosbag, topic, transform",
"url": null
} |
c, file, audio, music
if (status)
{
printf("Discotheque is ready in \"%s\"\n", file_name);
}
else
{
puts("Something seems to have gone wrong.");
return (EXIT_FAILURE);
}
return 0;
} I find it confusing that the header data sometimes contains the data in little-endian an... | {
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"tags": "c, file, audio, music",
"url": null
} |
python, performance, python-2.x, image, multiprocessing
cores = mp.cpu_count()
splitSchedules = chunkify(PossibleSchedules, cores)
splitSchedules[0].append("First")
result = []
try:
pool = mp.Pool(processes=cores)
result = pool.map(removeOverlaps, splitSchedules)
except:
pass
print ""
TruePossibleSchedule... | {
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"tags": "python, performance, python-2.x, image, multiprocessing",
"url": null
} |
R n. We’ll show why Green’s theorem …. The theorem was demonstrated by B. It doesn’t matter how strange or random the sequence appears to be, as long as it is bounded then at least one part of it converges. Le Théorème de Bolzano-Weierstrass Le théorème de Bolzano-Weierstrass est bien connu des étudiants de licence et ... | {
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"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9869795079712153,
"lm_q1q2_score": 0.8159475913181288,
"lm_q2_score": 0.8267117855317473,
"openwebmath_perplexity": 741.2188326969012,
"openwebmath_score": 0.8232946991920471,... |
electronic-configuration, transition-metals
For Au and Ag, however, strongly bound s-electrons participate in extremely powerful (due to relative small size of s-orbitals) s-s interactions, while for Hg only relatively weak s-p and d-p interactions are possible because of filled d- and s- subshells. Thus, metallic Ag ... | {
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"tags": "electronic-configuration, transition-metals",
"url": null
} |
c++, ros-hydro, opencv2
find_package(catkin REQUIRED
COMPONENTS opencv2)
include_directories(
${catkin_INCLUDE_DIRS}
> ${opencv2_INCLUDE_DIRS} )
target_link_libraries(BasicObstDetect_node
${catkin_LIBRARIES}
> ${opencv2_LIBRARIES} )
package.xml:
<build_depend>opencv2</build_depend>
<run_depend>opencv2</run_depend>
... | {
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"tags": "c++, ros-hydro, opencv2",
"url": null
} |
ros2, plugin
robot_description = {"robot_description": robot_description_content}
controller_config_path = PathJoinSubstitution(
[
pkg_path,
"config",
"gazebo_ros_control_params.yaml",
]
)
assert os.path.exists(controller_config_path.perform(LaunchContext())), (
"The co... | {
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"tags": "ros2, plugin",
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} |
quantum-mechanics, hilbert-space, wavefunction, born-rule
$\displaystyle A =\sum_{\sigma_p(A)} \lambda_i P_i$
The eigenvectors $\{\psi_i\}_{i \in \mathbb N}$ of $A$, each corresponding to a different eigenvalue $\lambda_i$, form a base for $\scr H$.
Using 2., we can represent each element $\psi \in \scr H$ in the fol... | {
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"tags": "quantum-mechanics, hilbert-space, wavefunction, born-rule",
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} |
quantum-mechanics, hamiltonian
i.e. $\Psi(x,t)$ is an eigenstate of $\hat H$ with eigenvalue $-\hbar \phi$. This means, incidentally, that $\phi$ must have the dimensions of energy/action, that is to say
$$\phi=\frac E \hbar$$
So if a state is stationary, it is an eigenstate of $\hat H$. Since we know that the reverse... | {
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} |
model simulates a simple technique to implement space vector modulation. These are called Hamilton’s equations. For each region of phase space there is a local formulation of the system so that the evolution of the system is described by a time-independent Hamiltonian that depends only on the momenta. Phase Space. 2 bi... | {
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"lm_q1_score": 0.9822877033706598,
"lm_q1q2_score": 0.8053711484277776,
"lm_q2_score": 0.8198933425148213,
"openwebmath_perplexity": 837.5383784951399,
"openwebmath_score": 0.7293795943260193,
"tags": ... |
terminology, algorithm-analysis
Title: What is meant by $\operatorname{poly}(|F|, n, e)$? When I am reading a paper I found a notation $\operatorname{poly}( |F|,n,$$\frac{1}{\epsilon}) $.
Its not clear to me that what this notation represents. Can you please help me out? $F=\mathrm{poly}(n)$ means that $F$ is polynomi... | {
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"tags": "terminology, algorithm-analysis",
"url": null
} |
c#, error-handling, exception
public class UserManager
{
IDictionary<string, User> db;
public UserManager()
{
var users = new []{
new User("anne.droid@example.com", "Anne"),
new User("rob.ott@example.com", "Robert")
};
db = new Dictionary<string, User>();
... | {
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"tags": "c#, error-handling, exception",
"url": null
} |
c++, c++11, multithreading, concurrency, queue
#define is not the C++ way to define constants. Use const, constexpr and static with file-scope variables where appropriate. This allows you to have typed constants as well.
There is no need to write struct data out in lines like struct data* writable_ptr = cptr_q.GetWrit... | {
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"tags": "c++, c++11, multithreading, concurrency, queue",
"url": null
} |
machine-learning, reinforcement-learning, python, intelligent-agent
Where State can be any combination of current observations and history that seem relevant to the problem. The optimisation is usually over some measure of success, achieving goals etc. Reinforcement learning formalises these terms using Markov Decisio... | {
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"tags": "machine-learning, reinforcement-learning, python, intelligent-agent",
"url": null
} |
last line shows the current rates of maximal and total primes produced, and the number of synchronizations per second.I caught the program just seconds before completion. The pools are running low and some workers are paused, waiting for more work to do. I am now tackling base 30. So far the largest prime found is "lfm... | {
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"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9777138164089086,
"lm_q1q2_score": 0.8016210360500867,
"lm_q2_score": 0.8198933293122507,
"openwebmath_perplexity": 1227.4545652521233,
"openwebmath_score": 0.2366325557231903,
"tags": n... |
c#, beginner, multithreading
int i;
for (i = 0; i < array.Length; i++)
the int i could be in the loop declaration like so
for (int i = 0; i < array.Length; i++)
its more idiomatic.
While we are at this method, I noticed that the same method is also in the HashPrinter class and therfor should be extracte... | {
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"openwebmath_score": null,
"tags": "c#, beginner, multithreading",
"url": null
} |
machine-learning, reinforcement-learning, q-learning
Title: Definition of the Q* function in reinforcement learning I'm making my way through Sutton's Introduction to Reinforcement Learning. He gives the definition of the $q_*$ function as follows
$$
q_*(a) = \mathbf{E}[R_t | A_t = a]
$$
where $A_t$ is the action take... | {
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"tags": "machine-learning, reinforcement-learning, q-learning",
"url": null
} |
ecology, population-dynamics, population-biology
For r-Selection your B and D will both be very high, and for K-Selection both B and D will be low. However, both will result in a positive λ simply because it's all about the ratios. | {
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"tags": "ecology, population-dynamics, population-biology",
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Your splitting $$X_1$$ into $$X_2$$ and an independent $$Y_3$$ is a correct approach and you get $$\textrm{Cov}(X_{2}, X_{1})=\textrm{Cov}(X_{2}, X_{2} + X_{3})=\textrm{Var}(X_2)+0=10p(1-p)$$
So $$\textrm{Corr}(X_{2}, X_{1})=\frac{\textrm{Cov}(X_{2}, X_{1})}{\sqrt{\textrm{Var}(X_2)\textrm{Var}(X_1)}}=\frac{10p(1-p)}{\... | {
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"lm_q1_score": 0.9850429156022934,
"lm_q1q2_score": 0.8165403047675573,
"lm_q2_score": 0.8289388125473629,
"openwebmath_perplexity": 281.4372058638745,
"openwebmath_score": 0.8673206567764282,
"tag... |
quantum-mechanics, statistical-mechanics, momentum
Title: Sum over momentum states In our lecture we used quite a couple of times that the sum over momentum states can be approximated by an integral over them.
But instead of substituting $\sum_p \rightarrow \int d^3p$, we replaced $\sum_p \rightarrow \frac{V}{h^3} \... | {
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"tags": "quantum-mechanics, statistical-mechanics, momentum",
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} |
# line integral of a circle
December 25, 2020 | {
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"lm_q1q2_score": 0.8557656683969074,
"lm_q2_score": 0.8824278602705731,
"openwebmath_perplexity": 576.2616667115445,
"openwebmath_score": 0.9467667937278748,
"tag... |
rotation, frame, matrix
Title: Siciliano et al. Rotation Matrix Notation I'm reading Siciliano et al.'s Robotics: Modeling, Planning and Control, and I'm confused about the notation used in definiting rotation matrices.
On page 46, they state
If $\textbf{R}_i^j$ denotes the rotation matrix of Frame $i$ with respect t... | {
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"tags": "rotation, frame, matrix",
"url": null
} |
erlang
generate_weapon(Type) when Type == large -> Weapons = ["Battle Axe 1d8 ", "Halberd 1d10 ", "Polearm 1d10 ",
"Two-Handed Sword 1d10 ", "Normal Sword 1d8 ", "Club 1d4 "],
pick_random_from_list(Weapons).
p... | {
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"lm_q2_score": null,
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"openwebmath_score": null,
"tags": "erlang",
"url": null
} |
c#, excel, .net-core
private static async Task Main(string[] args)
{
try
{
var usersList = new List<User>();
await ReadAllExcelFilesInDirectory(
@"C:\Test", usersList);
await InsertUsersIntoDatabase(usersList);
... | {
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"openwebmath_score": null,
"tags": "c#, excel, .net-core",
"url": null
} |
Q4. Show that the points (2, 3, 4), (– 1, – 2, 1), (5, 8, 7) are collinear. | {
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"lm_q2_score": 0.8267117898012105,
"openwebmath_perplexity": 597.1726522203791,
"openwebmath_score": 0.7879791855812073,
"tags": ... |
c++, reinventing-the-wheel, c++20
return comparator(left, right.first);
});
}
constexpr void merge(flat_multimap<K, T, C, A>& source) {
std::vector<value_type, A> vec(size() + source.size(),
buffer.get_allocator());
std::swap(buffer, vec);
... | {
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"tags": "c++, reinventing-the-wheel, c++20",
"url": null
} |
Let’s start by answering: Is the Chi-square goodness of fit test an appropriate method to evaluate the distribution of flavors in bags of candy?
• We have a simple random sample of 10 bags of candy. We meet this requirement.
• Our categorical variable is the flavors of candy. We have the count of each flavor in 10 bag... | {
"domain": "jmp.com",
"id": null,
"lm_label": "1. Yes.\n2. Yes.",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9921841116729335,
"lm_q1q2_score": 0.8620361265494706,
"lm_q2_score": 0.8688267796346599,
"openwebmath_perplexity": 441.5611618161789,
"openwebmath_score": 0.6582071781158447,
"tags": null... |
ros, octomap, octree, rviz-plugins
Title: how to create octomap_masgs for octomap_rviz_plugins
I want to use octmap_rviz_plugins to display the map in rviz ( I DONT want to use octomap_server)
1- OccupancyGrid: Displays 3D occupancy grids generated from compressed octomap messages.
2- OccupancyMap : Displays projecte... | {
"domain": "robotics.stackexchange",
"id": 20895,
"lm_label": null,
"lm_name": null,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "ros, octomap, octree, rviz-plugins",
"url": null
} |
thermodynamics, physical-chemistry
Basically, the heat capacity of common gases is a function of temperature. Taken these gases as ideal gases, the heat capacity function can be approximated with the following polynomial:
$$C_p = a + b \Delta T + c \Delta T^2 + d \Delta T^3$$
So the integral expression of the enthalpy... | {
"domain": "physics.stackexchange",
"id": 10483,
"lm_label": null,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "thermodynamics, physical-chemistry",
"url": null
} |
electric-circuits, electric-current, electrical-resistance, power, batteries
A real battery, for example, is neither an ideal voltage nor an ideal current source. It is a monster electrical, chemical, thermal, mechanical, etc., system for which we ignore almost everything and assume that while we are using it the volt... | {
"domain": "physics.stackexchange",
"id": 55525,
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"openwebmath_score": null,
"tags": "electric-circuits, electric-current, electrical-resistance, power, batteries",
"... |
# If $f: \mathbb R^n \to \mathbb R^n$ is a contraction, then $x-f(x)$ is a homeomorphism
I am stuck in following homework question.
Let $f : \mathbb R^n \to \mathbb R^n$ be a uniform contraction and $g(x) = x - f(x)$. Investigate whether $g : \mathbb R^n \to \mathbb R^n$ is a homeomorphism or not.
The definition of ... | {
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"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9817357184418847,
"lm_q1q2_score": 0.8071724388867503,
"lm_q2_score": 0.8221891327004133,
"openwebmath_perplexity": 95.49939107256496,
"openwebmath_score": 0.9353192448616028,
"tag... |
homework-and-exercises, electrostatics, charge, conductors
$Q_1-q'_2 - q''_1 - ...$ at the center of $O_1$
$Q_2-q'_1 - q''_2 - ...$ at the center of $O_2$
By replacing the surface of the conductors by all the image charges you get a situation equivalent to the an irregular surface charge on the spheres.
If you want t... | {
"domain": "physics.stackexchange",
"id": 22129,
"lm_label": null,
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"lm_q1_score": null,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "homework-and-exercises, electrostatics, charge, conductors",
"url": null
} |
neuroscience, plant-physiology
In which case the answer to your question "Can plants feel pain?" is "no", regardless of whether plants react to damage through the release of chemicals or not, and whether one would like to classify this as "pain" or not. | {
"domain": "biology.stackexchange",
"id": 4295,
"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": "neuroscience, plant-physiology",
"url": null
} |
fluid-dynamics, definition, flow, physical-constants
Now fix a marble inside the pipe. You now have an additional dimensionless parameter to play around with, the diameter of the marble divided by the diameter of the pipe, $d/D$. And so you've got many choices of characteristic length you might use for Reynolds number... | {
"domain": "physics.stackexchange",
"id": 90690,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "fluid-dynamics, definition, flow, physical-constants",
"url": null
} |
electric-circuits, symmetry, electrical-resistance
i. two branches have identical resistance and potential difference OR
ii. $V_2$ and $R_2$ of the second branch is such that
$$\frac{V_2}{R_2}=I=\frac{V_1}{R_1}$$ basically the Ohm's Law.
Now if this criteria is satisfied, you can name the various symmetries, by the "l... | {
"domain": "physics.stackexchange",
"id": 79986,
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"lm_q2_score": null,
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"openwebmath_score": null,
"tags": "electric-circuits, symmetry, electrical-resistance",
"url": null
} |
set A = {1,2,3,4}
set B = {5,6,7,8}
None of the members of set A are contained within set B, nor are any of the members of B contained within A. Thus, there is no overlap of the circles. In the second example in the above Venn diagram, Set A is totally contained within set B How can we explain this situation? Suppose... | {
"domain": "allaboutcircuits.com",
"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9895109096680231,
"lm_q1q2_score": 0.850646654439144,
"lm_q2_score": 0.8596637451167997,
"openwebmath_perplexity": 251.04761772641496,
"openwebmath_score": 0.580830454826355,
"t... |
c++, image, windows
// Handles the WM_CLOSE message (destroys the window, return 0)
VOID CMsgHandler::Handle_Close()
{
DestroyWindow(hWnd);
return_val = (LRESULT)0;
}
// Handles the WM_DESTROY message (posts the exit code for the window; return 0)
VOID CMsgHandler::Handle_Destroy()
{
PostQuitMessage(0);
... | {
"domain": "codereview.stackexchange",
"id": 10838,
"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++, image, windows",
"url": null
} |
formal-languages
Title: Have I correctly defined the language of strings that have balanced parenthesis? I am trying to learn about formal languages and I was wondering how I would go about defining the language that contains all strings which have matched parentheses and this is the definition I came up with —
$L = \... | {
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"id": 21200,
"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": "formal-languages",
"url": null
} |
c++, template-meta-programming
// COSINE
template <class X, int N> struct cos
{
static const long double value;
};
template <class X, int N> const long double cos<X, N>::value =
(((N % 2 == 0 ? 1 : -1) * power<SimplifyRad<X>, 2*N>::value) / ((long double) fact<2*N>::value)) + cos<X,... | {
"domain": "codereview.stackexchange",
"id": 26827,
"lm_label": null,
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"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "c++, template-meta-programming",
"url": null
} |
classical-mechanics, lagrangian-formalism, field-theory, variational-principle, constrained-dynamics
\end{equation}
subject to the constraints
\begin{equation}
T_{ij}-\frac{\partial_i f_j + \partial_j f_i}{2}=0.
\end{equation}
(All field components are set to be real-valued.)
I am using the field-theoretic language no... | {
"domain": "physics.stackexchange",
"id": 90434,
"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": "classical-mechanics, lagrangian-formalism, field-theory, variational-principle, co... |
The second example using permutations is different because it is an example of selecting 5 cards one at a time. You are assuming that choosing one card will affect the next one because the total cards left is one less. However that is not the case in your question because for it to affect the next card, you have to res... | {
"domain": "stackexchange.com",
"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.986777179025415,
"lm_q1q2_score": 0.8306943335102842,
"lm_q2_score": 0.8418256432832333,
"openwebmath_perplexity": 224.90326165788542,
"openwebmath_score": 0.6932688355445862,
"tag... |
javascript, node.js, async-await
Title: Convert this method into parallel await I am using Node.js. I have two different classes. The first one is called Controller, the second is called ServerCommunicator. Controller calls a method in SC (sendDataToDolibarrAsync), which takes a JSON array as indata and loops through ... | {
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"id": 30556,
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"lm_name": null,
"lm_q1_score": null,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "javascript, node.js, async-await",
"url": null
} |
# Old man and stick
An old man is walking with a stick with initial length 1. Every time he steps the stick breaks with uniform distribution along its (remaining) length. He holds the stick at the very end and holds on to the remaining piece. What is the expected number of steps before the stick has length less than $... | {
"domain": "stackexchange.com",
"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9688561667674651,
"lm_q1q2_score": 0.8094633850929125,
"lm_q2_score": 0.8354835452961425,
"openwebmath_perplexity": 260.7899792080031,
"openwebmath_score": 0.883643627166748,
"tags... |
# 2002 AMC 12B Problems/Problem 18
## Problem
A point $P$ is randomly selected from the rectangular region with vertices $(0,0),(2,0),(2,1),(0,1)$. What is the probability that $P$ is closer to the origin than it is to the point $(3,1)$?
$\mathrm{(A)}\ \frac 12 \qquad\mathrm{(B)}\ \frac 23 \qquad\mathrm{(C)}\ \frac ... | {
"domain": "artofproblemsolving.com",
"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9881308779050737,
"lm_q1q2_score": 0.8276781557274155,
"lm_q2_score": 0.8376199694135332,
"openwebmath_perplexity": 79.10734313502171,
"openwebmath_score": 0.9332157969474792,
... |
electromagnetic-radiation, thermal-radiation, absorption
For example, I can't understand how a piece of hot iron (which can be modelled as a black body) can absorb every single wavelength of EM radiation that falls upon it if only certain energy transitions are allowed by electrons. I understand that there are more tr... | {
"domain": "physics.stackexchange",
"id": 30858,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "electromagnetic-radiation, thermal-radiation, absorption",
"url": null
} |
c#, asp.net
Taking all of that into account, here's my rewrite:
public class Client
{
private ExchangeService _service;
/// <summary>
/// Given a collection of messages with exactly one Pdf attachment,
/// write all single-page pdfs to disk. Any messages with a single-page
/// pdf attachment will ... | {
"domain": "codereview.stackexchange",
"id": 32661,
"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#, asp.net",
"url": null
} |
java, parsing, io, logging
NotParsableException(final String message, final Throwable cause) {
super(message, cause);
}
NotParsableException(final Throwable cause) {
super(cause);
}
}
/**
* Used to read log entries from log files.
*
* @author Frank van Heeswijk
*/
public interface Log... | {
"domain": "codereview.stackexchange",
"id": 11618,
"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, parsing, io, logging",
"url": null
} |
java, tic-tac-toe, swing
private final Color bg1 = new Color(255,0,0);
private final Color bg2 = new Color(0,255,0);
public static void main(String[] args) {
new TicTacToe().go();
}
public void go() {
main = new JFrame("Tic Tac Toe!");
buttons = new TicButton[3][3];
rows = new JPanel[3];
in... | {
"domain": "codereview.stackexchange",
"id": 32075,
"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, tic-tac-toe, swing",
"url": null
} |
90 degrees but less than 180 degrees, Answer and Explanation: Types of Angles: In Geometry, two lines intersect at a point to form an Angle. (a) Two adjacent angles can be complementary. Each pair of angles of the same size are called vertical angles. Types Of Angles In Geometry, Properties, Examples, Class 6 Maths Pra... | {
"domain": "com.mx",
"id": null,
"lm_label": "1. Yes\n2. Yes",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9748211553734218,
"lm_q1q2_score": 0.8226467988861915,
"lm_q2_score": 0.8438951025545426,
"openwebmath_perplexity": 675.4889749429253,
"openwebmath_score": 0.5626471638679504,
"tags": null,
... |
discrete-signals, signal-analysis, fourier-transform, signal-power, signal-energy
B) $E = \sum_{n} |x[n]|^2$ - samples can never subtract energy, so $E_\text{long} \geq E_\text{short}$. $x[n] > 0$ isn't required.
C) "Distorted" here means that $\mathcal{F}\{x[n]\}$ will not be an overlap-added version of shiftings of... | {
"domain": "dsp.stackexchange",
"id": 10408,
"lm_label": null,
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"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "discrete-signals, signal-analysis, fourier-transform, signal-power, signal-energy",
... |
slam, navigation, octomap, octomap-server
Original comments
Comment by Mike Moore on 2012-02-04:
It looks like the OCTOMAPS build has some missing dependencies on qt4-opengl and qglviewer-qt4 so I tried installing the libqglviewer-qt4-2 and libqglviewer-qt4-dev but they haven't cleared up the build yet. Even rosmak... | {
"domain": "robotics.stackexchange",
"id": 8106,
"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, octomap, octomap-server",
"url": null
} |
java, linked-list, generics
if ((listSize == 0) || (position == -1) || (listSize == position)) {
append(value, position);
}
else if ((listSize != 0) && (position == 0)) {
leftAppend(value, position);
}else if ((position != 0) && (position > 0) && (position != listSize)){
leftInsert(value, position);
}else ... | {
"domain": "codereview.stackexchange",
"id": 5245,
"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, linked-list, generics",
"url": null
} |
4. Lemma. Exercise. Thus $$z$$ has a unique solution modulo $$n$$,and division makes sense for this case. Let a and b be positive integers. Exercise. History Talk (0) Share. Thus, if we only wish to consider integers, we simply can not take any two integers and divide them. Addition, subtraction, and multiplication fol... | {
"domain": "com.au",
"id": null,
"lm_label": "1. YES\n2. YES\n\n",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9850429116504951,
"lm_q1q2_score": 0.8143465969327848,
"lm_q2_score": 0.8267117983401363,
"openwebmath_perplexity": 369.0676248974898,
"openwebmath_score": 0.8721988201141357,
"tags": nul... |
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