text stringlengths 1 1.11k | source dict |
|---|---|
ros, python, ros-kinetic
class Detector:
def __init__(self):
self.pubtracking = rospy.Publisher('control', Float32MultiArray, queue_size=1)
rospy.Timer(rospy.Duration(1 / 50), self.control)
self._bridge = CvBridge()
# rospy.Subscriber("/camera/rgb/image_color", Image, self.image_ca... | {
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Thus, we can say that every subspace of has a basis and .
A basis is a good thing because we can break down any element in the space that the basis defines into a linear combination of basic building blocks, i.e. the basis vectors.
To find a basis use the following method:
1. Form a matrix where the jth column vecto... | {
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"id": null,
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"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9893474904166246,
"lm_q1q2_score": 0.8111594186493482,
"lm_q2_score": 0.8198933403143929,
"openwebmath_perplexity": 293.740094673211,
"openwebmath_score": 0.9159740209579468,
"tags": nul... |
gravity, gravitational-waves
Consider the traditional Newtonian definition of gravity:
$$ F = G \frac{m_1 m_2}{r^2} $$
The two $m$ terms refer to the mass of two objects for which you want to know the attractive force. The $r$ term is more important to your question - it refers to the distance between the two objects.... | {
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"tags": "gravity, gravitational-waves",
"url": null
} |
Since both the Symmetric Matrices Set and PSD Cone are Linear Sub Space hence even the greedy iterative projection on the set will yield an orthogonal projection on the intersection of the 2 sets. See Orthogonal Projection onto the Intersection of Convex Sets.
So, with all the tools above one could create his own solv... | {
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"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9852713835553862,
"lm_q1q2_score": 0.8678241541093267,
"lm_q2_score": 0.8807970764133561,
"openwebmath_perplexity": 443.85929961810206,
"openwebmath_score": 0.8040797114372253,
"ta... |
discrete-signals
I'm happy with the MS of the AC component because it incorporates the information, just like the amplitude of the signal because of their direct relation.
I've read a few articles, especially this one
Precision measurement of sine wave amplitude with ADC
which sounded like it was exactly my problem. I... | {
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"openwebmath_score": null,
"tags": "discrete-signals",
"url": null
} |
php, html
// All required fields are there, so we can do the upload
if (isset($_FILES['artist_thumb'], $_FILES['artist_profile_image'])) {
$allowed_ext = array('jpeg','jpg','gif','png');
$thumb_dir = process_upload('artist_thumb', $allowed_ext);
$profile_image_... | {
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"openwebmath_score": null,
"tags": "php, html",
"url": null
} |
octomap, octomap-server, pointcloud
Original comments
Comment by anonymousSnowMan on 2013-01-14:
The entire data set contains over 91 million points, consisting of 90000 individual scans of around 1080 points each (40Hz Hokuyo). The problem with down-sampling is that many points are only seen by the laser once, potent... | {
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"openwebmath_score": null,
"tags": "octomap, octomap-server, pointcloud",
"url": null
} |
lagrangian-formalism, symmetry, action, noethers-theorem
Title: Are all Lagrangians translationally invariant? I am rather stumped by David Tong's derivation of the energy-momentum tensor for a translationally invariant theory because it appears it doesn't assume any type of Lagrangian at all.
A Lagrangian $\mathcal{L... | {
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"tags": "lagrangian-formalism, symmetry, action, noethers-theorem",
"url": null
} |
ros, rosbag, machines, multiple, synchronization
Title: rosbag play on two machines
Hi,
I have recorded simultaneously multiple cameras sequences on two machines with rosbag.
I now would like to replay this sequence simulataneously on the two machines (to avoid transfer images on the network) with a good synchronizat... | {
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"tags": "ros, rosbag, machines, multiple, synchronization",
"url": null
} |
ros, exploration, hector-slam, 2dcostmap
Then I type in the terminal:
rosrun costmap_2d costmap_2d_node
and I have this message:
[ WARN] [1457435463.401726560]: Timed out waiting for transform from base_link to map to become available before running costmap, tf error: Could not find a connection between 'map' and 'ba... | {
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"tags": "ros, exploration, hector-slam, 2dcostmap",
"url": null
} |
reinforcement-learning, ai-design, deep-rl, markov-decision-process
In general, you need to consider different types of symmetry within the system - especially what is meaningful about the id number you have assigned to each entity. If the entity id is not meaningful, or is secondary to some other factor, you have som... | {
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"tags": "reinforcement-learning, ai-design, deep-rl, markov-decision-process",
"url": null
} |
performance, csv, r
files_data <- grep(".csv", files_data, value = T, fixed = T)
length(files_data)
files_data # paths to files
myAproach <- function(i) {
require(readr)
tempPath <- files_data[i]
name <- basename(tempPath)
name <- gsub('-', '_', substr(name, start = 0,
stop = ... | {
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"tags": "performance, csv, r",
"url": null
} |
ros
Title: Some questions about C++ header file references when programming ROS2humble
This header file always fails to be referenced:
#include "tutorial_interfaces/msg/num.hpp"
I don’t know why. I am learning humble from Foxy’s tutorial. Is it because of version differences?
Originally posted by xudadi on ROS Answ... | {
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"tags": "ros",
"url": null
} |
java, swing, beginner
public static void main(String[] args) {
SwingUtilities.invokeLater(new JFileParserProgram());
}
}
or this
public class JFileParserProgram {
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
@Override
public ... | {
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"tags": "java, swing, beginner",
"url": null
} |
rosdep, ros-hydro, ubuntu, ubuntu-precise, armhf
I was getting the same error but for all the dependencies, however that was resolved by apt-get update command.
Any suggestions. This is going onto an ARM device with 12.04 installed and did have fuerte installed.
EDIT
I found and followed this option to use pip to inst... | {
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"tags": "rosdep, ros-hydro, ubuntu, ubuntu-precise, armhf",
"url": null
} |
moveit
Nobody requires you to make that translation fixed though and it might vary across requests.
-- Clarification --
MoveIt can handle Multi-Chain Robots and you can specify where to move each chain (e.g. "finger" in case of a human-like hand) and plan and execute the motion for the full robot.
Prominently Shadow R... | {
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} |
c++, c++11, game, sdl
void View::draw_end_screen(Team winner) {
// ...
if (winner == RED) {
// ...
}
else if (winner == GREEN) {
// ...
}
else {
assert(!"draw_end_screen called with no winner");
}
// ... | {
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"tags": "c++, c++11, game, sdl",
"url": null
} |
c#, object-oriented, library
EntityManager singleton
Hmmm, a singletone is coming along. How am I be able to write unit tests for a singleton or for classes which uses this singleton? Hmmm, I just can't easily do this, because I can't reset the state of this singleton between tests which is bad.
For instance assume we... | {
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} |
navigation, viso2-ros, robot-pose-ekf, gps-common, robot-localization
Not sure how you intended to have your tf tree looking, but for your application, if you plan on fusing GPS data with your state estimate (which I don't necessarily recommend - see the map/odom/base_link/world frame parameters on the wiki page), the... | {
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"tags": "navigation, viso2-ros, robot-pose-ekf, gps-common, robot-localization",
"url": ... |
objective-c, ios
Now we only need to keep the images in memory and we can let the table view recycle all the other elements of the array that don't need to be downloaded and can easily be redrawn on the fly. | {
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"tags": "objective-c, ios",
"url": null
} |
c#, beginner, object-oriented, programming-challenge
catch any other exception aside from the IndexOutOfRange, once they
do that we know it's time to stop checking for specific direction.
RowValues Method
If we have startingIndex = 0 and right = true the first 4
adjacent numbers are at indexes : 0, 1, 2, 3 so the for ... | {
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} |
newtonian-mechanics, forces, momentum, collision
Title: Force to deflect ball colliding with wall Suppose I have a ball with a certain coefficient of restitution. The wall can be considered indeformable and with infinite mass. Everything's in 3 dimensions, and the ball can hit the wall at any angle.
The ball has a cer... | {
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"tags": "newtonian-mechanics, forces, momentum, collision",
"url": null
} |
android, classes, kotlin
// Function to provide a random number. Set the lowest number and highest number.
private fun rand(start: Int, end: Int): Int {
require(start <= end) { "Illegal Argument" }
val random = Random.Default
return random.nextInt(start, end + 1)
}
// function to determine level due to dif... | {
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python, python-3.x, hangman
As you can see clearly, there is now only a single place where the print(...)ing happens. The elements of the gallow are stored as a tuple (a list would work too), ready to be used in .format(...). Using a tuple/list allows us to do "...".format(*gallow) which is shorthand for "...".format(... | {
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"tags": "python, python-3.x, hangman",
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q-learning, deep-rl, policies
Unfortunately you cannot train the agent directly online on each step and expect good results in practice. DQN requires experience replay as the source of training data. For each step of experience, should store data for start state, action, immediate reward, end state and whether this wa... | {
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python, beginner
Which allows you to now write:
produce_entries_chunk("Player Name", 1, 2, 1)
produce_entries_chunk("Character Name", 2, 2, 3)
produce_entries_chunk("Class Name", 3, 12, 4)
. . .
It becomes difficult to reduce down from here though due to the varying arguments passed in to each call. You could loop ov... | {
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electromagnetic-radiation, visible-light, dispersion
$$
1.000314\lesssim n \lesssim 1.000322.
\tag{2}
$$
If we pretend for simplicity that the interface between this slab-atmosphere and the vacuum is abrupt, then the angle of refraction $\theta_r$ is related to the angle of incidence $\theta_i$ by (https://en.wikiped... | {
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} |
biochemistry, enzymes
A double mutant F207S/A213D gave the highest molecular activity of 1.1 min−1 for the amide, corresponding to a 2-fold increase compared with that of the wild-type lipase. A structural model of the lipase indicated that the mutations occurred at the sites near the surface and remote from the catal... | {
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"tags": "biochemistry, enzymes",
"url": null
} |
homework-and-exercises, newtonian-mechanics, momentum, friction, conservation-laws
Title: M1 vs M2 on a frictionless surface I was wondering, if I had a frictionless surface and I had an M1 that was 100kg and an M2 that was 1kg and I pushed each separately with an equal force F would they move at the same speed or am ... | {
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"tags": "homework-and-exercises, newtonian-mechanics, momentum, friction, conservation-laws"... |
mechanical-engineering, structural-engineering, stresses
You can find the difference in expansion by comparing the expanded areas of the plug made by steel and made by the gun metal using the equation below:
THERMAL EXPANSION IN TWO DIMENSIONS
For small temperature changes, the change in area ΔA is given by ΔA = 2αAΔ... | {
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So, the name "slope" fits the definition "change in y over change in x," and that concept is useful because of slope-intercept form. Maybe the egg came first, but the chicken made it worth incubating!
From this perspective, it is quite possible that the simple form of the equation came first, with no particular names ... | {
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And people were RIGHT to question this -- "hey it REALLY LOOKS flat" but the error was in failing to accept new information that clearly disproved the flat hypothesis.
I've reviewed DOZENS of images where people are ASTONISHED that you can see a distant island where the NAIVE equation says you shouldn't be able to see... | {
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"openwebmath_score": 0.6087819337844849,
"tags":... |
fft, convolution, finite-impulse-response, ifft
Is my understanding above correct?
What I'm very uncertain about is that it looks more like I've created a simple EQ rather reverb.
More specifically, I can't figure out how to extract and apply the time-variant Mag and Phase characteristic of the reverb space. For examp... | {
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} |
deep-learning, deep-neural-networks, unsupervised-learning
The main limitation is that the conventional GAN can produce samples only from random noise and to encode a real image the model has to be extended. There are different approaches to overcome this limitation, for example ALAE.
This paper compares some of these... | {
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c++, template, template-meta-programming
static type deserialize_data(const std::vector<char>& value)
{
return type(value.begin(), value.end());
}
};
Do you guys see any improvement ?
Thank you. You can use an internal traits type to reduce redundancy and complexity.
template< typename serialized >
st... | {
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valid as long as $|n|$ is large enough. The first terms of this series are
$$x = n^{-1} - n^{-6} + 5n^{-11} - 35n^{-16} + 285n^{-21} - 2530n^{-26} + 23751 n^{-31} + \cdots.$$
• Thanks Antonio. Is there a proof of Lagrange inversion theorem in the book you mentionned in the other post: Bruijn's Asymptotic Methods in A... | {
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"openwebmath_score": 0.9684133529663086,
"tag... |
classical-mechanics, coordinate-systems, hamiltonian-formalism, hamiltonian, phase-space
Title: How to explain the different forms of the Hamilton-Jacobi equation? In Arnold's Mathematical Methods of Classical Mechanics, he derives the Hamilton-Jacobi equation (HJE) using a generating function $S_1(Q, q)$ to get
$$
H\... | {
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"tags": "classical-mechanics, coordinate-systems, hamiltonian-formalism, hamiltonian, phase-... |
deep-learning, geometric-deep-learning
Title: How are edge features implemented in Geometric Deep Learning? The work I've seen so far have the nodes containing features. Any resources for how to use a GCN on a graph where the edges are the ones that contain features rather than the nodes? In the paper Neural Message P... | {
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"tags": "deep-learning, geometric-deep-learning",
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Voiceover: Easily the most quoted number people give you when they're publicizing information about their credit cards is the APR. I think you might guess or you might already know that it stands for annual percentage rate. What I want to do in this video is to understand a little bit more detail in what they actually ... | {
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"lm_q1_score": 0.9867771763033943,
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"lm_q2_score": 0.8289388146603365,
"openwebmath_perplexity": 524.9297373029649,
"openwebmath_score": 0.6286947131156921,
"t... |
neuroscience, physiology, sensation, perception, balance
Despite the increasing use of virtual reality, the impact on cerebral
representation of topographical knowledge of learning by virtual
reality rather than by actual locomotion has never been investigated.
To tackle this challenging issue, we conducted an experim... | {
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"tags": "neuroscience, physiology, sensation, perception, balance",
"url": null
} |
java, object-oriented, file-system
if (authorList.indexOf(capitalizedAuthor) == -1) {
list = "There are no books by that author.\n";
}
else {
sortBooksByAuthor();
int i = 0;
// Find first book by the author
while (!bookList.get(i).getAuthor()... | {
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"tags": "java, object-oriented, file-system",
"url": null
} |
entanglement, circuit-construction
$$ CX_{0,1} |10\rangle = |11\rangle$$
This is the first circuit you have in your question.
However, if you perform the same CNOT gate to the product (not entangled state) state $|\psi_0 \rangle = \dfrac{ (|0\rangle + |1\rangle) \otimes |0\rangle }{\sqrt{2}} = \dfrac{|00\rangle + |10\... | {
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"tags": "entanglement, circuit-construction",
"url": null
} |
newtonian-mechanics, momentum, conservation-laws, collision
Them assuming that $M \rightarrow \infty$, which in practice is impossible, gives you Professor Lewin's result. | {
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"tags": "newtonian-mechanics, momentum, conservation-laws, collision",
"url": null
} |
everyday-chemistry, materials, metallurgy
Title: Will fire corrode stainless steel? I am considering building a stove out of stainless steel. I want to us stainless steel because the stove will have a double outer jacket to pass water through and heat it.
Will a wood fire sitting directly on stainless steel corrode it... | {
"domain": "chemistry.stackexchange",
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"tags": "everyday-chemistry, materials, metallurgy",
"url": null
} |
electrical-resistance, metals
A free electron only "sees" imperfections and it is the interaction between the free electrons and the imperfection which is the origin of resistance. Free electrons are scattered off imperfections and alloys have many more of them than pure metals. | {
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"tags": "electrical-resistance, metals",
"url": null
} |
classification, dataset, feature-selection
More samples will allow improving accuracy
More samples will enable learning more complex concepts, that might fit your data better.
As @Emre wrote, real life data sets usually are not clean as in PAC learning. The concept class is not given to you, the data has noise and a g... | {
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"tags": "classification, dataset, feature-selection",
"url": null
} |
time-complexity, computational-geometry
Title: Maximal subsets of a point set which fit in a unit disk Suppose that there are a set $P$ of $n$ points on the plane, and let $P_1, \dots, P_k$ be distinct subsets of $P$ such that all points in $P_i$ fits inside one unit disk for all $i$, $1\le i\le k$.
Moreover, each $P_... | {
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"openwebmath_score": null,
"tags": "time-complexity, computational-geometry",
"url": null
} |
quantum-mechanics, experimental-physics, antimatter, quarks
Title: Does an antiparticle leave a different (from the normal particle) mark in a bubble chamber experiment Experimentalists usually have experiments where they scatter particles superheated transparent liquid, thus checking for the particle's traces.
These ... | {
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"tags": "quantum-mechanics, experimental-physics, antimatter, quarks",
"url": null
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## Table of values and a recursion
The first thing we noticed was that the ending height is always even, since we change the parity by $1$ at each of the $2n$ steps. So let the ending height be $2k$, and define $f(n,k)$ to be the number of positive up-down walks of length $2n$ ending at height $2k$. We can simply list... | {
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"lm_q1_score": 0.9948603884452759,
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"lm_q2_score": 0.8104789086703225,
"openwebmath_perplexity": 139.21010217117905,
"openwebmath_score": 0.928167879581451... |
quantum-mechanics, pauli-exclusion-principle
with $|a|^2 + |b|^2 = 1$. So let us try to anti-symmetrize two of these. \begin{align*}\operatorname{Alt}(|\psi\rangle_1 \otimes |\psi\rangle_2) = & (a_1 \mid\uparrow\rangle + b_1\mid\downarrow\rangle)\otimes (a_2 \mid\uparrow\rangle + b_2 \mid\downarrow\rangle) - (a_2 \m... | {
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"tags": "quantum-mechanics, pauli-exclusion-principle",
"url": null
} |
ros, talker
Originally posted by Victor Lopez with karma: 651 on 2013-07-29
This answer was ACCEPTED on the original site
Post score: 1
Original comments
Comment by Bholms on 2013-07-29:
The problem is that if I have 100 machines, then I will have to do this for all of them... That's why I am thinking of doing it wit... | {
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"tags": "ros, talker",
"url": null
} |
homework-and-exercises, mass, pressure, volume, ideal-gas
Rough volume would be $630$mm$\times\pi \times \pi (15$mm$)^2 = 1.4\times10^6$mm$^3 = 0.0014$m$^3$
Rough surface area: $630$mm$\times\pi \times 30$mm$\times\pi = 1.87\times10^5$mm$^2 = 0.187$m$^2$ You need an equation for the density of the gas as a function of... | {
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"tags": "homework-and-exercises, mass, pressure, volume, ideal-gas",
"url": null
} |
$2 \cdot \pi \int_{1}^{2} (x+2)(2-x) \,dx$
then I added these together, but I did not get the correct answer, could anyone show me what the error in my steps are?
2. Mar 19, 2014
### BvU
I am issing 2). relevant equations. Where did you get the idea to set up the integrals as you did ?
Did you make a drawing to see... | {
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"openwebmath_score": 0.858790934085846,
"tags"... |
ruby, jekyll, liquid
I generally try to avoid magic variables where ever possible. Using match and the resulting MatchData object tends to be less error prone.
code = code.gsub "<", "<"
Is there a reason you only escape < characters? Unless I'm missing something, it seems preferable to use CGI.escapeHTML in... | {
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"openwebmath_score": null,
"tags": "ruby, jekyll, liquid",
"url": null
} |
noise, sampling, quantization, anti-aliasing-filter
Do you know how to calculate the variance of the process
$\{n_f(t) \colon -\infty < t < \infty\}$?
No? Hint: it is the area under the power spectral density curve of $\{n_f(t)\colon -\infty < t < \infty\}$ provided that you are not using radian frequency but are usi... | {
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"tags": "noise, sampling, quantization, anti-aliasing-filter",
"url": null
} |
performance, vba, ms-word
Watch your line indentation. Ends should be at the same indentation
level as the If they belong to.
Instead of declaring HeadingNumber as a long in your sub
declaration, you should consider using WdBuiltInStyle.
So instead of this:
Sub MiniTOCFields(HeadingNumber As Long, TOCLevel As Long) ... | {
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"tags": "performance, vba, ms-word",
"url": null
} |
php, error-handling
switch ($e['type']) {
/* We'll ignore these errors. They're only here for reference. */
case E_WARNING:
case E_NOTICE:
case E_CORE_WARNING:
case E_COMPILE_WARNING:
case E_USER_WARNING:
case E_USER_NOTICE:
case E_STRICT:
case E... | {
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"id": 1616,
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"openwebmath_score": null,
"tags": "php, error-handling",
"url": null
} |
all(round(v,10) == round(cov(cbind(x,y)),10)) #equivalency of r code cov() on a single matrix with variables x and y compared to above using cov() on seperate vectors x and Y
## [1] TRUE
all(list(
v[1,1] == cov(x,x) & v[1,1] == var(x),
v[2,2] == cov(y,y) & v[2,2] == var(y),
v[1,2] == cov(x,y)))
## [1] TRUE | {
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"lm_q2_score": 0.8289387998695209,
"openwebmath_perplexity": 13184.835133401131,
"openwebmath_score": 0.34487006068229675,
"tags": ... |
c#, performance, file
# Get the value from the byte slice that represents the field in the database file/
dynamic value = TranslateBuffer(dataBuffer.Skip(fieldStart).Take(fieldLength).ToArray(), field);
var transformerType = ((FieldAttribute) Attribute.GetCustomAttribute(property, typeo... | {
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"tags": "c#, performance, file",
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c++, file
This below code is the Sales_item.h file.
/*
* This file contains code from "C++ Primer, Fifth Edition", by Stanley B.
* Lippman, Josee Lajoie, and Barbara E. Moo, and is covered under the
* copyright and warranty notices given in that book:
*
* "Copyright (c) 2013 by Objectwrite, Inc., Josee Lajoie, a... | {
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Question
# Let $$(x,y,z)$$ be points with integer coordinates satisfying the system of homogeneous equations:$$3x-y-z=0$$$$-3x+z=0$$$$-3x+2y+z=0$$.Then the number of such points which lie inside a sphere of radius $$10$$ centered at the origin is
Solution
## Adding first two equations, we get $$y=0$$and substituting... | {
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"lm_q2_score": 0.8175744761936437,
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"openwebmath_score": 0.9574287533760071,
"tags": ... |
meteorology, climate, temperature
But the sinking air from high pressure is quite often the kickoff factor that helps the inversion\pollution\fog to get building up [note that air that doesn't mix not only builds up pollutants... but builds up moisture too, favoring more fog, especially when solar heating is reduced].... | {
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"tags": "meteorology, climate, temperature",
"url": null
} |
newtonian-mechanics, conservation-laws, earth, estimation
It would be a bit like asking "if a flea on your body jumped in one direction, could it push you?" Furthermore, the flea's effect on your body is larger than our effect on Earth. | {
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For linear dependence, you want to show that there exist $a$ and $b$, not both $0$, such that $af(t)+bg(t)=0$ for all $t$ (that is, identically). For linear independence, you want to show that there is no $a$ and $b$ (not both $0$) which works for all $t$. The point is that for any functions $f$ and $g$, and any $k$ su... | {
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"lm_q1q2_score": 0.8206851999751072,
"lm_q2_score": 0.8354835330070839,
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"openwebmath_score": 0.9048807621002197,
"tag... |
core, gravity
And just as you say, there is a tiny place at the very centre where almost all the mass of the Earth and therefore almost all the gravity is outside this central point. Imagine this central point to be a cannonball. There is no enormous mass at its centre, pulling it down, and the gravitational field of ... | {
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"tags": "core, gravity",
"url": null
} |
autocorrelation, power-spectral-density
Title: Autocorrelation for the sum of a deterministic and stochastic signal so I'm working on a problem where I need to find a PSD for the sum of a deterministic and stochastic function. So assume $x(t)$ being this sum:
$x(t) = d(t)+s(t)$
where $d(t)$ is the deterministic funct... | {
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"tags": "autocorrelation, power-spectral-density",
"url": null
} |
ros, roomba, turtlebot
except DriverError:
if sensor_read_retry_count > 0:
rospy.logwarn('Failed to read sensor package. %d retries left.' % sensor_read_retry_count)
sensor_read_retry_count -= 1
continue
else:
... | {
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physical-chemistry, equilibrium, concentration, pressure
b. $\pu{2.0 mol}$ of $\ce{X}$, $\pu{2.0 mol}$ of $\ce{Y}$
$Q_p=4.01 \rightarrow$ no solid is formed
c. $\pu{1 mol}$ of $\ce{X}$, $\pu{1 mol}$ of $\ce{Y}$
$Q_p=1.00 \rightarrow$ no solid is formed
I assume that the pressure unit is atmospheres. | {
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"url": null
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thermodynamics, energy, phase-transition
You can tweak this in several ways. Firstly, you can add the non-mixing contributions to the free energy, which vary linearly with $\phi$, namely $f_2\phi + f_1(1-\phi)$, taking $\phi$ to be the mole fraction of species 2. Here $f_1$ and $f_2$ are basically the chemical potenti... | {
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"tags": "thermodynamics, energy, phase-transition",
"url": null
} |
ros, navigation, gps-common, robot-pose-ekf
In this way I can control the values of rxx,ryy and rzz.
But as you know this approach ins't the best because with one gps you can't obtain the rotation of robot, but work.
2º Option robot_pose_ekf(new version jade, work in indigo) + utm(with changes) + ublox(changes):
With ... | {
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"tags": "ros, navigation, gps-common, robot-pose-ekf",
"url": null
} |
machine-learning, python, neural-network, keras
Directory structure:
Training_path
-Label1 Folder
-Label2 Folder
-Label3 Folder
I think that was the problem in my network. That the argument activation wasn't working as expected and no activations were performed on the network input. What I don't understan... | {
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java, algorithm, programming-challenge, dynamic-programming
/**
* Returns the part with the extension of an archive
*/
public String getExtensao(File arq) {
if(arq != null) {
String filename = arq.getName();
int i = filename.lastIndexOf('.');
if(i>0 && i<filename.length()-1) {... | {
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periodic-table, history-of-chemistry
In particular, the above Wikipedia article on de Chancourtois emphasizes that he "was the first scientist to see the periodicity of elements when they were arranged in order of their atomic weights." A public domain image of his "Telluric Helix" is also available at the Wikipedia ... | {
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"tags": "periodic-table, history-of-chemistry",
"url": null
} |
c++, programming-challenge, c++11, time-limit-exceeded, computational-geometry
for (int i = 0; i < (n - 2); ++i)
{
double angle = computeAngle(x2[i], x2[i+1], x2[i+2], y2[i], y2[i+1], y2[i+2]);
if (angle > test)
{
... | {
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"tags": "c++, programming-challenge, c++11, time-limit-exceeded, computational-geometry"... |
ros, dae, planning-scene, mesh
Title: How to get a vertice list from a .dae or .mesh file
Is there an easy way to have a vertice list from a .dae or .mesh file for importing into a planning scene as a CollisionObject?
If I use the arm_navigation_msgs::Shape::MESH type, I have to provide a vertice list, but I don't kn... | {
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"openwebmath_score": null,
"tags": "ros, dae, planning-scene, mesh",
"url": null
} |
c++, thread-safety, singleton
std::thread threadOne(SingletonTester, 20, thread1string);
std::thread threadTwo(SingletonTester, 30, thread2string);
threadOne.join();
threadTwo.join();
ss << "Singleton tester finished." << std::endl;
CPrinter::Printer(ss);
} First note. Since C++11 the construction of sta... | {
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"id": 27741,
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"tags": "c++, thread-safety, singleton",
"url": null
} |
Notice that this argument really tells us that the product of a countable set and another countable set is still countable. The same holds for any finite product of countable set. Since an uncountable set is strictly larger than a countable, intuitively this means that an uncountable set must be a lot largerthan a coun... | {
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"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9895109109053045,
"lm_q1q2_score": 0.8043410778757084,
"lm_q2_score": 0.8128673155708975,
"openwebmath_perplexity": 99.61678054747503,
"openwebmath_score": 0.958059549331665,
"tags": ... |
quantum-algorithms, simons-algorithm, hidden-subgroup-problem
Finally, the set $X$ is $\{0,1\}^n$ and the map $f$ is precisely the map as given in Simon's problem. Let's check that the defining property to make $(G, H, f)$ an instance of a hidden subgroup problem actually holds, namely that $f$ is constant on cosets $... | {
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"id": 659,
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"openwebmath_score": null,
"tags": "quantum-algorithms, simons-algorithm, hidden-subgroup-problem",
"url": nu... |
electromagnetism, magnetic-fields, plasma-physics, sun, magnetohydrodynamics
Since nuclear fusion is the ultimate heat source in the solar interior and it is not necessarily uniform (nor is the transport of said heat), there are going to be differential bulk flows of plasma due to thermal pressure gradients etc. In s... | {
"domain": "physics.stackexchange",
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"tags": "electromagnetism, magnetic-fields, plasma-physics, sun, magnetohydrodynamics",
"... |
sound, mfcc, machine-learning
Using an existing package to perform the signal processing is generally a great idea, as long as you're happy to trust it! I'd certainly encourage you to make sure you understand all the processing being carried out on your data - this will affect your ability to demonstrate that your wor... | {
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"tags": "sound, mfcc, machine-learning",
"url": null
} |
going to make the permutation is: I will start by keeping the first number, i. Deflnition 2. in Output: permutation. I'm sorry, but if I remember it correctly a permutation of n (unique) numbers is a variation of the length n containing each of the numbers exactly once, so for 1, 2, 3 you have: 123 132 213 231 312 321 (... | {
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"openwebmath_score": 0.7891137003898621,
"tags... |
c#, beginner
OCP: you cannot easily add new coffee types without touching multiple functions.
SRP: the PrepareCoffee method not only creates a coffee but also contains logic for multiple recipies.
Let's fix that...
Fix
We start by creating a few abstractions that will allow us to create more concrete objects.
The fi... | {
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quadprog - Quadratic programming. , the number of equations equals the number of unknowns. Nonlinear optimization is a complex matter in the field of vehicle safety, especially when occupants and pedestrian impactors are used to compute injuries. For solver-based nonlinear examples and theory, see Solver-Based Nonlinea... | {
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"lm_q1_score": 0.9840936110872273,
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"lm_q2_score": 0.8244619242200082,
"openwebmath_perplexity": 1403.5366973196892,
"openwebmath_score": 0.4197305142879486,
"tags... |
Author Message
TAGS:
### Hide Tags
Manager
Joined: 09 Dec 2006
Posts: 96
Followers: 1
Kudos [?]: 34 [2] , given: 0
90 students represent x percent of the boys at Jones [#permalink]
### Show Tags
26 Aug 2007, 11:07
2
KUDOS
1
This post was
BOOKMARKED
00:00
Difficulty:
45% (medium)
Question Stats:
59% (02:15) co... | {
"domain": "gmatclub.com",
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"lm_q1q2_score": 0.8091211576744523,
"lm_q2_score": 0.855851143290548,
"openwebmath_perplexity": 7858.364377055794,
"openwebmath_score": 0.595085859298706,
"tags": n... |
and Slavery programme: Find out more. Contact Number: 09202737517. The below workout is the step by step procedure to find how many number of distinct ways to arrange the 11 letters (alphabets) of word "MATHEMATICS". Some have a dedicated National 800 number, while others use online services. 5 1 billion Dec. We must b... | {
"domain": "xrayworks.de",
"id": null,
"lm_label": "1. YES\n2. YES\n\n",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9871787857334057,
"lm_q1q2_score": 0.8350964261454992,
"lm_q2_score": 0.8459424353665381,
"openwebmath_perplexity": 1211.2152926140193,
"openwebmath_score": 0.31705012917518616,
"ta... |
electromagnetism, electric-circuits, batteries, electrochemistry, conservative-field
What can we say about $\int \frac{\vec{F}}{q} \cdot \mathrm{d}\vec{s}$ inside the battery? | {
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"tags": "electromagnetism, electric-circuits, batteries, electrochemistry, conservative-fie... |
ros, orocos
Originally posted by Ruben Smits with karma: 543 on 2011-03-28
This answer was ACCEPTED on the original site
Post score: 1
Original comments
Comment by Miguel Prada on 2011-03-28:
It does work now. I can see that the 'float' type gets loaded from librtt-typekit-gnulinux.so (I guess this is the typekit you... | {
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} |
ros, navigation, model, amcl
In our opinion, this is right, but the change in the formula (from uncertainty being linear to quadratic in motion distance) "compensates" this correction.
Imagine driving a straight line forward for a certain distance a. When sampling the motion (distance only), we end up with a normal di... | {
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"tags": "ros, navigation, model, amcl",
"url": null
} |
organic-chemistry, molecular-orbital-theory, orbitals, hybridization
To reduce this back into ‘bonds’, we need to use mathematical tricks. Simply spoken: All wave functions can be treated as vectors, and vectors can be linear combinated to give other vectors — meaning we take $0.5$ times orbital $\Psi_1$, $0.01$ times... | {
"domain": "chemistry.stackexchange",
"id": 3729,
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"tags": "organic-chemistry, molecular-orbital-theory, orbitals, hybridization",
"url": n... |
phase ) is represented as (... Have$ \tan\theta=2-\sqrt { 3 } $for the Argument calculator - Simplify expressions. And displayed calculator does basic arithmetic on complex numbers calculator evaluates expressions in the displayed... Have converted a complex number … polar and exponential forms - calculator conversion ... | {
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"lm_q1_score": 0.957912274487423,
"lm_q1q2_score": 0.8063951261825719,
"lm_q2_score": 0.8418256532040707,
"openwebmath_perplexity": 987.9640415293046,
"openwebmath_score": 0.8588264584541321,
"tag... |
optics, sun, spectroscopy
Different lines are emitted from different parts of the solar atmosphere. The temperature and pressure vary throughout the photosphere, where most of the visible emission occurs. Unless you know where in the atmosphere each emitting ion is concentrated, the parameters used to obtain your abso... | {
"domain": "physics.stackexchange",
"id": 23022,
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"lm_q2_score": null,
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"openwebmath_score": null,
"tags": "optics, sun, spectroscopy",
"url": null
} |
special-relativity, group-theory, lie-algebra, poincare-symmetry, invariants
The essence of this lies in the fact that the commutator $[AB, C]$ equals $A[B, C] + [A, C]B$, which is not identically zero (perhaps you have gotten caught up in the terminology - it is identically zero for scalars as in numbers, not Lorentz... | {
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "special-relativity, group-theory, lie-algebra, poincare-symmetry, invariants",
"... |
homework-and-exercises, newtonian-mechanics, rotational-dynamics, moment-of-inertia
The green vectors indicate the key position vectors:
Position of centroid relative to fixed coordinate system: $\pmb{R_G}$
Position of an element of mass $dm$ relative to fixed coordinate system: $\pmb{R}$
Position of element relative ... | {
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"tags": "homework-and-exercises, newtonian-mechanics, rotational-dynamics, moment-of-inerti... |
Incidentally, in terms of notation, I think it is nicer to reserve bold type ($\mathbf a$) for matrices and vectors, and italic type ($a$) for their entries. This provides a visual advantage to the reader, so that it is easy to see at a glance that, for example, $\mathbf A = [\mathbf a_1, \ldots, \mathbf a_n]$ is a mat... | {
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"lm_q1_score": 0.9637799472560582,
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"lm_q2_score": 0.8723473663814338,
"openwebmath_perplexity": 131.4371516498472,
"openwebmath_score": 0.9278148412704468,
"tag... |
# 3.1. Fitting functions to data¶
In Section 2.1 we saw how a polynomial can be used to interpolate data—that is, derive a continuous function that evaluates to give a set of prescribed values. But interpolation may not be appropriate in many applications.
Demo 3.1.1
Here are 5-year averages of the worldwide tempera... | {
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"openwebmath_score": 0.8324900269508362,
"tags... |
c++, object-oriented, parsing
unsigned int semicolon = i + 1;
while (true) {
if (semicolon >= input.size()) {
std::cerr << "Line " << input[typeName].lineNumber << ", Column "
<< input[typeName].columnNumber
<< ", Parser error: Expected a semicolon to end... | {
"domain": "codereview.stackexchange",
"id": 38968,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "c++, object-oriented, parsing",
"url": null
} |
c#, strings
EDIT - Adding extension method:
namespace System
{
public static class GiladStrExt
{
public static string ApplySubString(this string value, int startIndex)
{
// You can invoke an extension method as a straight-up call,
// e.g. GiladStrExt.ApplySubString(test,... | {
"domain": "codereview.stackexchange",
"id": 11140,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "c#, strings",
"url": null
} |
ecmascript-6, react.js, sass, redux
Here is a link to a Codepen of the app
Javascript:
const initial = () => {
let recipesInit = {
recipes: [
{id: 1, title: 'Pao de queijo', ings: '100ml milk, 100ml vegetable oil, Pinch of salt, 250g tapioca flour, 125g parmesan or vegetarian alternative, grated, 1 f... | {
"domain": "codereview.stackexchange",
"id": 18108,
"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": "ecmascript-6, react.js, sass, redux",
"url": null
} |
java, algorithm, graph, pathfinding
* Note: This could run forever if it can't find the given node and there are an infinite number of nodes to process.
* @param vb
* @param h
* @param g
* @return
*/
public static <T extends Node<T>> List<T> IDA_Star(T vb, Heuristic<T> h, Goal<T> g)
{
... | {
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"lm_q2_score": null,
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"openwebmath_score": null,
"tags": "java, algorithm, graph, pathfinding",
"url": null
} |
newtonian-mechanics, orbital-motion, rocket-science, satellites
As far as I know, the trajectory doesn't depend on launch angle for large velocities.
This is not true. The escape velocity is angle-independent, which means that if the ball has speed greater than $\sqrt{\frac{2GM}{R}}$ then it will never return to Ear... | {
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"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "newtonian-mechanics, orbital-motion, rocket-science, satellites",
"url": null
} |
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