text stringlengths 49 10.4k | source dict |
|---|---|
Once you have $9\ge x^2$, I would recommend first solving the associated equation. That is, $9= x^2$ which does, in fact, have x= 3 and x= -3 as solutions. That divides the number line into 3 intervals, $(-\infty, -3)$, $(-3, 3)$, and $(3, \infty)$ on each interval of which the inequality is either true for every point... | {
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"lm_q2_score": 0.8479677545357569,
"openwebmath_perplexity": 272.50361983417446,
"openwebmath_score": 0.8143748641014099,
"ta... |
organic-chemistry, acid-base, electrophilic-substitution
Title: Validity of the leveling effect of water in nitration reactions Wikipedia gives this as the levelling effect of water
Any acid that is stronger than $\ce{H3O+}$ reacts with $\ce{H2O}$ to form $\ce{H3O+}$. Therefore, no acid stronger than $\ce{H3O+}$ exis... | {
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"openwebmath_score": null,
"tags": "organic-chemistry, acid-base, electrophilic-substitution",
"url": null
} |
javascript, jquery, image
Title: Image Filter client I've made an image filtering client for JavaScript that runs on jQuery, Vex and Fabric.JS.
You simply include the required files in your html page, along with something like:
<script type="text/javascript">
ImageFilter.defaultOptions.imageCallback = server.uploa... | {
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"tags": "javascript, jquery, image",
"url": null
} |
quantum-mechanics, operators, quantum-information, observables, foundations
Title: On the correspondence rules between the physical world and mathematical frameworks (quantum mechanics) At the start of Chapter 2 of his Quantum Mechanics: A modern development, Ballentine gives the framework which sets the stage for the... | {
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"tags": "quantum-mechanics, operators, quantum-information, observables, foundations",
"u... |
# Floor of Square Root Summation problem
I have problem calculating the following summation: $$S = \sum_{j=1}^{k^2-1} \lfloor \sqrt{j}\rfloor.$$
As far as I understand the mean of that summation it will be something like $$1+1+1+2+2+2+2+2+3+3+3+3+3+3+3+\cdots$$ and I suspect that the last summation number will be $(k... | {
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"openwebmath_score": 0.9708771109580994,
"tag... |
newtonian-mechanics, forces, work, spring
As functions of coordinates, the functions "$F$" and "$\widetilde{F}$" are technically different functions, but they represent the same force. (This is just like how given a point, the coordinates "$x$" and "$y$" of that point are different numbers but they represent the same ... | {
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"tags": "newtonian-mechanics, forces, work, spring",
"url": null
} |
neural-networks, machine-learning, convolutional-neural-networks, inference
Furthermore the framerate also depends on your NN architecture, image resolution etc. so a comparison here is completly misleading. If you want to have a general indication of speed look at how many int8 operations it can handle per second (TO... | {
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"tags": "neural-networks, machine-learning, convolutional-neural-networks, inference",
"url": n... |
+ 1}}\sqrt n }}{{\ln n}}\normalsize. The following is a Taylor Series evaluated a particular value of x, find the sum of the series. The Alternating Series Test Math. Alternating Series Test 1 Alternating Series Test If the terms of the alternating series ( 1)n 1b n b1 b2 b3 n 1 where bn 0 satisfy (1) bn 1 bn for all n... | {
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"lm_q2_score": 0.8774767858797979,
"openwebmath_perplexity": 830.88619511814,
"openwebmath_score": 0.7549763321876526,
"t... |
cosmology, dark-energy
Title: Exact solutions of quintessence models of dark energy I got the basic ideas quintessence (minimally coupled) and derived the KG equation for scalar field:
$$ \ddot{\phi} + 3 H \dot{\phi} + \frac{\partial V(\phi)}{\partial \phi} = 0 $$
where $$H=\frac{\dot{a}}{a}$$ and $\phi$ is the scala... | {
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"tags": "cosmology, dark-energy",
"url": null
} |
c#, .net, collections, linked-list
I would also remove _NodeCount, because you are maintaining it, but not using it anywhere to make decisions.
Finally, since you always insert an item in a Node, I would make Node's constructor accept the value T to be placed in Items[0], rather than keeping that code in the Add metho... | {
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"tags": "c#, .net, collections, linked-list",
"url": null
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% Script 3: Impuse Response due to rel and complex poles
clear all;close all;clc
numG = [3 2]; denG = [2 4 5 1]; % create G(s) as ratio of polys
[resG,polG,otherG] = residue(numG,denG) % residues &amp; poles of G(s)from equation (1)
t = [0:0.1:20]; % column vector of time points
ycmplx = cpole2t(polG(1),resG(1... | {
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"lm_q2_score": 0.843895106480586,
"openwebmath_perplexity": 1814.9959462561424,
"openwebmath_score": 0.940249502658844,
... |
turtlebot
Title: Which Robot for ROS?
Hi,
which of the supported robots would you recommend for using with ROS (educational purposes)? Turtlebot seems to lead the way but are there any real alternatives? Anything that comes close to Turtlebot (and is in the same/similar price range)?
Originally posted by Cav on ROS ... | {
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"tags": "turtlebot",
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} |
Focus on questions about an actual problem you have faced. Include details about what you have tried and exactly what you are trying to do.
• Understanding mathematical concepts and theorems
• History and development of mathematics
• Solving mathematical puzzles
• Software that mathematicians use
Not all questions wo... | {
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"openwebmath_score": 0.37803906202316284,
"ta... |
np.linalg.solve(A, f(x)) - np.linalg.inv(A) @ f(x)
array([-1.40100652e-01, 1.11382317e-01, 1.00881039e-01, 4.94520867e-01,
3.78189174e-01, -6.48834908e+00, -3.71602241e+00, 2.78155158e+01,
9.44989685e+00, -7.18503682e+01, -2.39184816e-01, 1.33213768e+02,
-2.37054964e+01, -1.84869925e+02, 2.41140115e+01, 1.66567... | {
"domain": "vanderzwaan.dev",
"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9752018398044143,
"lm_q1q2_score": 0.8040167811418721,
"lm_q2_score": 0.8244619199068831,
"openwebmath_perplexity": 2196.204180488731,
"openwebmath_score": 0.724637508392334,
"tags":... |
c, linked-list, queue
queuePrint(&q);
printf("\r\nCLEAR QUEUE\r\n");
queueClear(&q);
queuePrint(&q);
} Overall looks pretty reasonable, i'm missing the queueIsFull() implementation. I didn't try to compile
Use of bool
You're using bool only in one function, other functions indicate success via int values,... | {
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"tags": "c, linked-list, queue",
"url": null
} |
rotational-dynamics, reference-frames, moment-of-inertia, rigid-body-dynamics
Title: Principal axis of inertia parallel to the ones passing through the center of mass Consider a rigid body and the (at least) three axes of inertia passing through its center of mass.
Will any other axis not passing through the center of... | {
"domain": "physics.stackexchange",
"id": 30045,
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"tags": "rotational-dynamics, reference-frames, moment-of-inertia, rigid-body-dynamics",
... |
partial derivatives are 0 at the same time. ... 3. Since we are dealing with more than one variable in multivariable calculus, we need to figure out a way to generalize this idea. It is a good idea to use a computer algebra system like Mathematica to check your answers, as these problems, especially in three or more di... | {
"domain": "immobilierindex.com",
"id": null,
"lm_label": "1. YES\n2. YES\n\n",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9724147185726374,
"lm_q1q2_score": 0.8060723041718667,
"lm_q2_score": 0.8289388146603365,
"openwebmath_perplexity": 250.8086351868671,
"openwebmath_score": 0.7753627300262451,
... |
php, mvc, codeigniter, twig
$data = $this->Static_model->get_static_data();
$data['base_url'] = base_url("/");
$data['pages'] = $this->Pages_model->get_pages();
$data['categories'] = $this->Categories_model->get_categories();
//use limit and offset returned by _initPaginator method
... | {
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"tags": "php, mvc, codeigniter, twig",
"url": null
} |
Let's define a few random variables. Let $$U \sim \operatorname{Bernoulli}(\pi = 1/2)$$ represent the prior probability of selecting the unfair coin, where $$U = 1$$ means the coin is unfair, and $$U = 0$$ means the coin is fair. So $$\Pr[U = 1] = \Pr[U = 0] = 1/2$$. Next, define $$X \mid U \sim \operatorname{Binomial}... | {
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"lm_q1_score": 0.9859363700641143,
"lm_q1q2_score": 0.8651362660292674,
"lm_q2_score": 0.8774767746654976,
"openwebmath_perplexity": 322.5235814665366,
"openwebmath_score": 0.9114393591880798,
"tag... |
php, object-oriented, mvc, url-routing, .htaccess
}
/**
* get requested url
*/
public function get_url() {
return $this->url;
}
/**
* Call the correct controller class and method
*/
public function dispatch() {
//f... | {
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"tags": "php, object-oriented, mvc, url-routing, .htaccess",
"url": null
} |
electrostatics, electric-fields, potential, voltage, dipole
Title: Electric field and potential Suppose we consider a point dipole i.e. an ideal dipole. At the origin the potential:
$$ \phi(\mathbf r) = \frac{1}{4\pi\epsilon_0} \frac{\mathbf p\cdot\hat{\mathbf r}}{r^2}$$
is undefined due to the $1/r^2$ term in the pot... | {
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"tags": "electrostatics, electric-fields, potential, voltage, dipole",
"url": null
} |
java, tic-tac-toe
Title: Tic Tac Toe getWinner() method logic for a grid of any size nxn I have a college assignment in which I have to make a Tic Tac Toe game work. Some of the code has been provided by my instructor like method signatures etc. Now the rules for this particular project state that a player wins if the... | {
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"tags": "java, tic-tac-toe",
"url": null
} |
java, android
try
{
HttpResponse response = client.execute(get);
int statusCode = response.getStatusLine().getStatusCode();
if(statusCode == 200)
{
FileOutputStream fos = new FileOutputStream(path);
HttpEntity entity = response.ge... | {
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"openwebmath_score": null,
"tags": "java, android",
"url": null
} |
quantum-field-theory, symmetry, lie-algebra
3) Demanding that the operators $U$ satisfy the property (choosing translation for concreteness)
$$ U^\dagger \vec{x} U = \vec{x} + \vec{a}$$
doesn't immediately tell us how the transformation will affect other operators, such as the momentum or angular momentum operators. F... | {
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"openwebmath_score": null,
"tags": "quantum-field-theory, symmetry, lie-algebra",
"url": null
} |
complexity-theory, np-complete, p-vs-np
Title: Could there theoretically exist a problem $A$ which is in $co$-$NP$, but its complement $A^{C}$ is $EXPTIME$-complete? I was reading a bit about $NP$-problems and how it is widely assumed that $NP\neq co$-$NP$. This also implies that the complement of $NP$-complete proble... | {
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"id": 21243,
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"openwebmath_score": null,
"tags": "complexity-theory, np-complete, p-vs-np",
"url": null
} |
quantum-gate, entanglement
$$(\cos(\frac{\theta_1}{2}) \cos(\frac{\theta_2}{2}) |00⟩ + \cos(\frac{\theta_1}{2}) \sin(\frac{\theta_2}{2}) |01⟩ - i \sin(\frac{\theta_1}{2}) \cos(\frac{\theta_2}{2}) |11⟩ - i \sin(\frac{\theta_1}{2}) \sin(\frac{\theta_2}{2}) |10⟩)\otimes(\cos(\frac{\theta_3}{2})|0⟩+\sin(\frac{\theta_3}{2}... | {
"domain": "quantumcomputing.stackexchange",
"id": 1311,
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"openwebmath_score": null,
"tags": "quantum-gate, entanglement",
"url": null
} |
ros, realsense
Title: realsense_dist runtime error
Hello,
I'm using Intel Realsense R200 camera and Realsense ROS SDK. When I run realsense_r200_launch.launch, I encountered following error.
[ERROR] [1446254837.488498054]: DSAPI call failed at /home/turtlebot/catkin_ws/src/realsense_ros/src/r200_camera_nodelet.cpp:50... | {
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"id": 22869,
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"openwebmath_score": null,
"tags": "ros, realsense",
"url": null
} |
thermodynamics, statistical-mechanics, condensed-matter, density-of-states
The question How to prove that sum converges to integral using density of states? appears relevant but I still don't understand why the density of states fails for low energy states (for example, as in Bose-Einstein condensates). The energy lev... | {
"domain": "physics.stackexchange",
"id": 94510,
"lm_label": null,
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"openwebmath_score": null,
"tags": "thermodynamics, statistical-mechanics, condensed-matter, density-of-states",
"ur... |
electromagnetism, magnetic-fields, earth
Title: Will my data drives be safe in an emp event? If there was an emp event (maybe because the rotation of magnetism of the earth or an atomic bomb) would the data on my hard drives, ssd, dvd, mini dvi tapes and cassette tapes be safe? There is no way a switch in magnetism of... | {
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"id": 25743,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "electromagnetism, magnetic-fields, earth",
"url": null
} |
rviz, rostopic
Title: rviz run saved messages
Hello,
I'm running a program that sends visualization messages, like the ones in the basic shape tutorial.
While running the program I saved the messages with rostopic echo /visualization_marker > myfile.txt.
I'm looking for a way to display thoose messages in rviz, is t... | {
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"id": 23166,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "rviz, rostopic",
"url": null
} |
physical-chemistry, thermodynamics, enthalpy
Title: Calculating standard enthalpy of reaction, which reactant to choose for the amount of substance For example, this reaction: $$\ce{2NaOH + H2SO4 -> Na2SO4 + H2O}$$
Suppose both concentrations are $1\ \mathrm{mol\ l^{-1}}$ (standard condition). There is $0.02\ \mathrm{... | {
"domain": "chemistry.stackexchange",
"id": 615,
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"tags": "physical-chemistry, thermodynamics, enthalpy",
"url": null
} |
### $\sigma_0$ of $110$
$\map {\sigma_0} {110} = 8$
### $\sigma_0$ of $120$
$\map {\sigma_0} {120} = 16$
## Also see
• Results about the divisor count function can be found here. | {
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"openwebmath_score": 0.9717221260070801,
"tags": ... |
lagrangian-formalism, symmetry, action, noethers-theorem, variational-calculus
\begin{align}
\delta S &= \tilde{S}[\tilde{x}]-S[x]\\
&= \int_{\tilde{\Omega}}d^4\tilde{x}\;\tilde{\mathcal{L}}(\tilde{x}) - \int_{\Omega}d^4x\;\mathcal{L}(x)\tag{6}\\
&= \int_{\Omega}d^4x\;\partial_{\mu}W^{\mu}(x)\,.
\... | {
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"tags": "lagrangian-formalism, symmetry, action, noethers-theorem, variational-calculus",
... |
algorithm, graph, f#
24 141,6862 197,9337 66,5879 59,6941 70,4670 55,4106 103,8083 61,7906 48,7959 151,784 177,393 102,8731 199,2838 73,3509 8,8434 187,9327 22,594 150,5669 164,7312 157,9540 15,8040
25 115,9233 197,3875 185,3573 72,2332 104,4899 137,5378 8,3949 5,3... | {
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"openwebmath_score": null,
"tags": "algorithm, graph, f#",
"url": null
} |
java, generics
public void decrement() {
value--;
}
public int decrementAndGet() {
return --value;
}
@Override
public void add(Integer number) {
value += number;
}
@Override
public Integer addAndGet(Integer number) {
value += number;
return val... | {
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"tags": "java, generics",
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} |
$x = \frac{4 \pm \sqrt{4^2 - 4 \times 1 \times 6}}{2 \times 1}$
I can't complete because I get a negative value in the square root. Where did I go wrong?
The fact that you get a negative value in the square root illustrates that the function $x^2 + 4x + 6$ has no real roots, which is what you want to show.
3. Thanks ... | {
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Compare the sum of the original array and the permuted array.
fprintf('%g\n',abs(sum_orig-sum_perm));
1.42109e-14
Back to the top
## Examples (modified)
In some of the examples above, a slight change of the constants involved can fix the problems that we saw above. Below are modified versions of some of the above ... | {
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fluid-dynamics
We solve differential equations like this by rearranging to give:
$$ \frac{dh}{h^{1/2}} = -\frac{a\sqrt{2g}}{A}\,dt $$
and then just integrate:
$$ \int\frac{dh}{h^{1/2}} = -\frac{a\sqrt{2g}}{A}\int dt $$
But this isn't going to give you an exponential decay of $h$ with time. If you measure an exponentia... | {
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I really appreciate the help.
You have an arbitrary circle with center O and radius r, and an arbitrary point Q on that circle. And you have defined a circle with center O' (the image of O) and radius kr. So all you need to know is if Q' (the image of Q) is on the second circle. That will be true if the distance from O... | {
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"openwebmath_perplexity": 386.2201574766827,
"openwebmath_score": 0.8614867925643921,
"tag... |
installation, sdformat
Title: Running Gazebo without being superuser
Hello everyone, I am going to run Gazebo7 on Ubuntu 16.04. I installed it with ros-kinetic-desktop-full.
The command 'sudo gazebo' works without problems.
The command 'gazebo' returns: gzserver: error while loading shared libraries: libsdformat.so.6... | {
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"tags": "installation, sdformat",
"url": null
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ros, kinematics, urdf
Title: Workspace exploration from urdf?
Hi.
Is there an easy way or a package to compute forward kinematics from an URDF file? The idea behind is to "explore" the workspace of a robot, plotting reachable points and dexterous area.
As far as I understand the document, TF is for tracking frames. K... | {
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c#, beginner, winforms
There has got to be a way I can streamline this. I was hoping for something along the lines of
switch (this.ServerComboBox.SelectedIndex)
{
case 0:
var ds = new GR01.TargetVDNDataTable();
var adapter = new ICMQuery.Models.GR01TableAdapters.TargetVDNTableAdapter();
break... | {
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of a rigid body about a given axis is, defined as the sum of the products of the mass of each and every particle of the body and the square of its distance from the given axis. There are two vertical dashed lines, one through each ball, representing two different axes of rotation, axes a and b. You can ask me questions... | {
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"tags": n... |
1667-1754 ) we will learn how enter... Are real numbers, while i is the combination of real and numbers! Tutorial, Description Features Update information Download, Basics calculation results Desktop form presented... 9 on my Sharp rectangular and polar forms impedance of a complex to! Vector \ ( |z|\ ) of the number i... | {
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... |
where $\Psi$ is the Digamma function.
Then, \begin{align} \color{#f00}{\lim_{n \to \infty}\sum_{j = 1}^{n^{2}}{n \over n^{2} + j^{2}}} & = \lim_{n \to \infty}\Im\bracks{\Psi\pars{n^{2} - n\ic} - \Psi\pars{-n\ic}} \\[3mm] & = \lim_{n \to \infty}\Im\braces{% \bracks{\ln\pars{\root{n^{4} + n^{2}}} - \arctan\pars{{1 \over... | {
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"openwebmath_score": 0.9992294311523438,
"ta... |
Euclidean distances and Angular distances both cosine similarity between vectors... The seven possible answers is the right one case of high dimensional,! ( i.e the right one understanding of the plane and into the third dimension not just to 2D planes vectors... Length and Sepal Width ) cosine Angular distance PLOT Y1... | {
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"openwebmath_score": 0.744763195514679,
"tags": ... |
# Which function $(\hat{y} - y)^2$ or $(y - \hat{y})^2$ should I use to compute the gradient?
The MSE can be defined as $$(\hat{y} - y)^2$$, which should be equal to $$(y - \hat{y})^2$$, but I think their derivative is different, so I am confused of what derivative will I use for computing my gradient. Can someone exp... | {
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"ta... |
1
Unit Length Scaling
Unsolved
Fundamentals
Difficulty: 1 | Problem written by mesakarghm
Problem reported in interviews at
Data scaling is an important part of data preprocessing. Unit Length Scaling is the process of scaling the components of a feature vector such that complete vector has the length one. Each po... | {
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"openwebmath_score": 0.2217952162027359,
"tags": null,
... |
javascript, node.js, server
index.html
<!DOCTYPE html>
<html lang="en-US">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Login Portal</title>
<style type="text... | {
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"tags": "javascript, node.js, server",
"url": null
} |
Yeah I get your working. Just a side question, is it then impossible to obtain a minimum value of k?
Cheers.
jbunniii
Homework Helper
Gold Member
Yeah I get your working. Just a side question, is it then impossible to obtain a minimum value of k?
Cheers.
OK, go back to
$$9x^2 > \frac{7}{\epsilon} - 15$$
If this ... | {
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"openwebmath_score": 0.8796982169151306,
... |
electromagnetic-radiation, radioactivity, x-rays
Title: Can one see radioactive substances with an X-ray detector? I was wondering the other day an X-ray detector (like the ones used at airports) can detect gamma-rays lets say from a sample of uranium. I know its all electro-magnetic waves but I'm really unsure about ... | {
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"tags": "electromagnetic-radiation, radioactivity, x-rays",
"url": null
} |
# Thread: vertices of a square, coordinate geometry and differentiation
1. ## vertices of a square, coordinate geometry and differentiation
The origin O and a point B(p, q) are opposite vertices of the square OABC. Find the coordinates of the point A and C
A line l has gradient q/p. Find possible values for the gradi... | {
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"openwebmath_score": 0.8224073052406311,
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Now, applying row transformations again: $$\underbrace{\left(\begin{array}{cc}F_l & 0 \\ 0 & I\end{array}\right) \cdots \left(\begin{array}{cc}F_1 & 0 \\ 0 & I\end{array}\right)}_{Z} \left(\begin{array}{cc}H_B & C' \\ 0 & D\end{array}\right) = \underbrace{\left(\begin{array}{cc}H_B & C' \\ 0 & H_D\end{array}\right)}_{W... | {
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"lm_q1_score": 0.9918120896142623,
"lm_q1q2_score": 0.8108802540574197,
"lm_q2_score": 0.8175744806385543,
"openwebmath_perplexity": 89.4256192197994,
"openwebmath_score": 0.9822195768356323,
"tags... |
php, mysql
items - Table that holds information about items, includes name, price, etc.
Key column: item_id.
carts (renamed from checkout) - Table that holds information about user's carts. There's a 1:1 relationship between carts and checkouts, a single cart can't be checked out more than once, and a single checkout ... | {
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"openwebmath_score": null,
"tags": "php, mysql",
"url": null
} |
java, error-handling, servlets, jsp, captcha
Passwords must match
Emails must match
Fields may not be empty
Because this does not help when your new user disables javascript in his browser, you should revalidate these constraints in your service or enforce usage of javascsript by using <noscript>, but back to the mai... | {
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"id": 10468,
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"openwebmath_score": null,
"tags": "java, error-handling, servlets, jsp, captcha",
"url": null
} |
compute_value(a = a, int = int, inf = inf, n = n) # directly compute a RANGE of values
#> [1] 981.0000 962.3610 944.0761 926.1387 908.5421 891.2798 874.3454 857.7329
#> [9] 841.4360 825.4487
Note the difference between both for loops in this exercise and the vector-based solution:
• In 6.1, the current value of a ... | {
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"openwebmath_score": 0.3821958899497986,
"tags": nu... |
entanglement, superposition, quantum-state
$$\vert 3\rangle_{qudit}=\vert 11\rangle_{qubit},$$
then we can see that both $\vert \Psi\rangle$ and $\vert \Phi\rangle$ are the Bell states, e.g. are entangled.
This works nicely for $d=4$ or any other power of $2$. But would it work for any other dimension, such as $d=3$? | {
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plot(x_train, y_train, x_val, y_val, kernels, names)
def plot(x_train, y_train, x_val, y_val, kernels, names, attention=False):
fig, axes = d2l.plt.subplots(1, 4, sharey=True, figsize=(12, 3))
for kernel, name, ax in zip(kernels, names, axes):
y_hat, attention_w = nadaraya_watson(x_train, y_train, x_val, kernel)
if at... | {
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"lm_q2_score": 0.8577680995361899,
"openwebmath_perplexity": 12943.151166677042,
"openwebmath_score": 0.7578228712081909,
"tags": null,
... |
gazebo, urdf, plugin
<xacro:macro name="wheel_joint" params="left_or_right child y">
<joint name="chassis_${child}_joint" type="continuous">
<parent link="chassis"/>
<child link="${child}"/>
<origin xyz="0 ${y} ${first_layer_gap - 1/2 * layer_height - 1/2 * motor_height}" rpy="${pi/2} 0 0"/... | {
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"tags": "gazebo, urdf, plugin",
"url": null
} |
machine-learning, predictive-modeling, feature-selection
Title: Train and predict on a varying number of inputs - time based events I have the problem where I am trying to build a model which takes in n events for a single user as input for prediction, the problem is that the number of events is not set, so for exampl... | {
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"id": 5588,
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"lm_q2_score": null,
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"openwebmath_score": null,
"tags": "machine-learning, predictive-modeling, feature-selection",
"url": null
} |
ros, roslaunch, python3
Title: Input on launch file
Hey all,
I am using ROS Noetic and I have a a python 3 script that is being launched with a launch file. To further automatize my project, I wanted to know if it's possible to include input on the launch file to be used within the python script? And if so, How do I ... | {
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"tags": "ros, roslaunch, python3",
"url": null
} |
# Math Help - Factor Fully the following expression...
1. ## Factor Fully the following expression...
Hi,
im really not sure how to approach this problem.
Factor Fully the following expression...
abx^3 + (a-2b-ab)x^2 + (2b-a-2)x + 2
the answer i know is (x-1)(ax-2)(bx+1)
really not sure how to get the answer
2. He... | {
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"openwebmath_score": 0.9351678490638733,
"tag... |
[f'(c)=frac{f(b)−f(a)}{b−a}]
Proof
The proof follows from Rolle’s theorem by introducing an appropriate function that satisfies the criteria of Rolle’s theorem. Consider the line connecting ((a,f(a))) and ((b,f(b)).) Since the slope of that line is
[frac{f(b)−f(a)}{b−a}]
and the line passes through the point ((a,f(... | {
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"openwebmath_score": 0.9076383709907532,
"ta... |
rviz, ros-kinetic, rosserial, abb, joint-states
Original comments
Comment by gvdhoorn on 2018-12-14:\
I have a wireless ESP8266 microcontroller reading joint_state data from an ABB robot through serial connection
out of curiosity: what robot and controller is/are this? Seeing "serial" mentioned I'm guessing the cont... | {
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forces, everyday-life, projectile, drag, estimation
Title: Why can you in physics exercises neglect the effect of air drag in case of basketball but not in the case of ping pong ball? This is not a homework question or anything. I have finished schools and I always wondered why in physics exercises you can neglect the... | {
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"tags": "forces, everyday-life, projectile, drag, estimation",
"url": null
} |
complexity-theory
Title: Are subsets of $PSPACE$ closed under common operations By "subsets of $PSPACE$" I am referring to classes like $SPACE(n^k)$ for some constant $k$ (e.g. $k = 42$).
Under the union, intersection, and concatenation operations, such subset is apparently closed.
For the Kleene star and polynomial-t... | {
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"tags": "complexity-theory",
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unitarity, quantum-enhanced-machine-learning
(d) = (iv)
Moving on to line (d), this can also approximated to first order in $\Delta t$ by expanding the exponential as a power series (there is also a Baker Campbell Hausdorf formula for this):
\begin{align}
e^{-i \Delta t|x^k\rangle \langle x^k|}\sigma e^{i \Delta t|x^... | {
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electromagnetism, momentum, potential
Title: Magnetic Vector Potential - a measure of Momentum I am trying to understand the magnetic vector potential as momentum per unit charge, that is, somehow, the "total" momentum should be $p = mv +qA$.
Here's a part of the paper I was reading - I am facing difficulties understa... | {
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"tags": "electromagnetism, momentum, potential",
"url": null
} |
java, android, asynchronous, authentication, gui
Title: Login UI for an Android app This code starts a new thread for login and reacts according to the JSON result returned by the server.
I think this code has too many conditionals, exception handlers, and nested functions.
public void Login() {
mButton.setClickab... | {
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navigation, ros2
Originally posted by stevemacenski with karma: 8272 on 2021-10-25
This answer was ACCEPTED on the original site
Post score: 1
Original comments
Comment by JehanJay on 2021-11-10:
Yes, the problem was due to not having the complete TF tree. Translating all the Odom messages to TF solved the issue for ... | {
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php, beginner, mysql
Title: Auction function for a game This is an auction function for a game where you can bid on houses on the website.
You set a limit, and if posts limit below current bet or below your limit, it will raise the bid from current plus 1, until the limit is met. If your bid is over a player's limit, ... | {
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"tags": "php, beginner, mysql",
"url": null
} |
solid-state-physics, stress-strain
Title: Stress-Strain curve
(Point A shows proportional limit, B shows elastic limit, C shows UTS point, D shows fracture stress)
So I've read that stress is basically the result of strain acting on a body and that strain is applied first, then comes the stress. I've also read that a... | {
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"tags": "solid-state-physics, stress-strain",
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} |
c++, reinventing-the-wheel
This… seems wrong.
If I’m reading the code right, then reallocate(0) will simply reallocate the existing capacity. But that’s not the point of shrink_to_fit(). In fact, it seems completely pointless to just reallocate the existing buffer at the exact same size.
What shrink_to_fit() should do... | {
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"tags": "c++, reinventing-the-wheel",
"url": null
} |
Math Help - N positive integer problem with a + exponent
1. N positive integer problem with a + exponent
Here it is a problem that is driving me nuts...
Note: ^ means the exponent, in this case the exponent is "+".
If n is a positive integer, then n^+ denotes a number such that n < n^+ < n+1.
So decide which of the ... | {
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"tags... |
synoptic
Why is a front so quick to dissipate? Well, in large part because it's not a level situation; indeed, some storm energy is continually lost away to friction. Because of this, a front actually needs continual reinforcement to even maintain its gradient. Some times the pattern will permit fronts to continue ... | {
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"openwebmath_score": null,
"tags": "synoptic",
"url": null
} |
java, spring
// Move p3 up by 1 position
waitingRoom.move(p3, 1);
assertEquals("p1", waitingRoom.removePatient().get().getName());
assertEquals("p3", waitingRoom.removePatient().get().getName());
assertEquals("p2", waitingRoom.removePatient().get().getName());
assertEquals("p4"... | {
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"tags": "java, spring",
"url": null
} |
java, object-oriented, design-patterns, junit
/*
check if we will needs to wait for 40 days
after the medication to see the affect
* */
if (wait40Days) {
map.put('X', map.get('D'));
map.put('D', 0);
wait40Days = false;
}
}
// get the ... | {
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"tags": "java, object-oriented, design-patterns, junit",
"url": null
} |
coordinate-systems, tensor-calculus, vectors, terminology, covariance
Title: Consistent Definition of a Tensor I have come across two definitions for tensors. The first is as a map from $q$ copies of a vector space and $p$ copies of its dual space
\begin{equation}
T:\bigotimes^{p}V^{*}\bigotimes^{q}V\rightarrow\mathb... | {
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"tags": "coordinate-systems, tensor-calculus, vectors, terminology, covariance",
"url": n... |
cc.complexity-theory, graph-theory, np-hardness
Title: Non-rooted MST of directed graph I've found a problem that boils down to this: I need to find the non-rooted MST of a directed weighted graph. In other words, I need to find the minimal set of edges such that from any one node in the graph you can get to all other... | {
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"id": 521,
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"tags": "cc.complexity-theory, graph-theory, np-hardness",
"url": null
} |
waves, refraction, approximations, complex-numbers
Title: Index of Refraction in Metal: Approximating Complex Perturbation If you consider waves in a metal, you can write the index of refraction for the metal as,
$$ n^2 = 1 - \frac{\omega_p^2}{\omega^2} $$
I am interested in what will happen if the index is perturbed ... | {
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"openwebmath_score": null,
"tags": "waves, refraction, approximations, complex-numbers",
"url": null
} |
robotic-arm, kinematics, inverse-kinematics, jacobian
Title: Solving Inverse Kinematics with Gradient Descent I am trying to implement my own inverse kinematics solver for a robot arm. My solution is a standard iterative one, where at each step, I compute the Jacobian and the pseudo-inverse Jacobian, then compute the ... | {
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"tags": "robotic-arm, kinematics, inverse-kinematics, jacobian",
"url": null
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root = $$\frac{3}{3}$$ = 1. First we will find all factors under the cube root: 1000 has the cube factor of 1000. A perfect cube is a number which is equal to the number, multiplied by itself, three times. Find an answer to your question Which of the following numbers is a cube number ? Here is a list of numbers 6 8 11... | {
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"openwebmath_score": 0.5134052634239197,
"tags": nu... |
standard-model, history, weak-interaction, electroweak
Title: Charm prediction: Required electroweak or just weak? Everywhere I look it up the prediction of the charm quark is predicted by the electroweak interaction, which of course recovers the weak interaction with the spontaneous symmetry break and the Brout-Engle... | {
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} |
homework-and-exercises, newtonian-mechanics, classical-mechanics, energy-conservation, momentum
...it is obvious that energy is conserved in a gravitational field since
it is conservative.
And if all the interactions were with the gravitational field, you would be correct. But here, the acrobat also interacts with... | {
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"tags": "homework-and-exercises, newtonian-mechanics, classical-mechanics, energy-conservat... |
solutions, ions
The final case is that of $\ce{CH3COOH}$ and $\ce{NH4OH}$. Again, I will assume that $\ce{CH3COOH}$ is present in the beaker and the $\ce{NH4OH}$ is added from the burette.
This case is a little different from the previous case. The neutralisation of $\ce{H+}$ and $\ce{OH-}$ will occur in this case too... | {
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"tags": "solutions, ions",
"url": null
} |
computability, proofs, proof-theory, halting-problem, undecidability
My analysis of it so far:
Assume we discover a program X that isn't verifiable. In other words there is a proof that there does not exist any algorithm A to determine if X terminates or does not. Then simply running X cannot result in us finding out ... | {
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"tags": "computability, proofs, proof-theory, halting-problem, undecidability",
"url": nu... |
image-processing, object-recognition, matched-filter
I found the free library tesseract (https://github.com/ldiqual/tesseract-ios-lib) easy to use and with plenty of customizability. At first the results were very random but applying sharpening and monochromatic filter and a color invert worked well to clean up the te... | {
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"id": 706,
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "image-processing, object-recognition, matched-filter",
"url": null
} |
bond, stereochemistry
The influence of intramolecular hydrogen bonding on the
photodissociation of cis-HONO is probed via measurements on the OH
fragment ejected by specific [...] stretching (ν2) vibrational levels
of the à state. Due to hydrogen bonding between the H atom and the
terminal oxygen, the ν2 motio... | {
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"tags": "bond, stereochemistry",
"url": null
} |
python, networking, twitter, benchmarking, status-monitoring
When running the script, there is no easy way to stop it. CTRL+C does not work, I have to manually kill the process. This is probably because of how threading.Thread handles it, but I'm not sure.
It would be nice if it was slightly easier to add a different ... | {
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"tags": "python, networking, twitter, benchmarking, status-monitoring",
"url": null
} |
deep-learning, lstm
Title: How did Andrej Karpathy make the LSTM output byte values for sampling Shakespeare? I'm wondering how continuous output values of deep learning networks are converted to byte values or other discrete values for that sake.
For example here: In his famous article The Unreasonable Effectiveness ... | {
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• @MarcoFellous-Asiani The definition I gave was "you can write the runtime of one as an exponential function of the other". So I'm not sure how the example you gave is a counter-example since you're using different polynomials ($Poly_C$ and $Poly_Q$). It's important to note $b^n$ is not in the same asymptotic family a... | {
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"lm_q2_score": 0.8311430478583168,
"openwebmath_perplexity": 342.8909114290206,
"openwebmath_score": 0.817556619644165,
"tags... |
ros, slam, navigation, rtabmap, move-base
<!-- reset frame_id parameters using user input data -->
<param name="global_costmap/global_frame" value="$(arg global_frame_id)"/>
<param name="global_costmap/robot_base_frame" value="$(arg base_frame_id)"/>
<param name="local_costmap/global_frame" val... | {
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"tags": "ros, slam, navigation, rtabmap, move-base",
"url": null
} |
java, beginner, object-oriented, calculator
public static int sum(int... a) {
return IntStream.of(a).sum();
}
public static int product(int... a) {
int result = 1;
for (int i = 0; i < a.length; i++) {
result *= a[i];
}
return result;
}
public static... | {
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"tags": "java, beginner, object-oriented, calculator",
"url": null
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inorganic-chemistry
[OP] In this answer (https://chemistry.stackexchange.com/q/99812) it is said that the precipitation of silver sulfide drives the reaction to completion, however, silver is also a solid, and hydrogen also a gas, so there shouldn't be a reasion why silver should completely decompose in a hydrogen sul... | {
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"openwebmath_score": null,
"tags": "inorganic-chemistry",
"url": null
} |
superconductivity, quantum-computer, cooling
Title: Are quantum computers at least build able? Assuming a highly unrealistic where you basically have unlimited money to burn.
Is it possible to a build a size scalable quantum computer?
My premise is that I often read tha people have a made a single qubit transistor etc... | {
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"tags": "superconductivity, quantum-computer, cooling",
"url": null
} |
quantum-mechanics, dark-matter, decoherence
Title: Can dark matter be ordinary matter in a quantum coherent state? The hypothetical dark matter halo envelopping a galaxy looks like to a gaussian distribution of position probability density of a particle in a quantum coherent state.
How long should a wave function of t... | {
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"openwebmath_score": null,
"tags": "quantum-mechanics, dark-matter, decoherence",
"url": null
} |
cooling
Title: Efficiency loss for a cooling element for cooling parts smaller than the cold plate I would like to cool a small device, with a size of 45x45 mm² and a thermal load of ~40 W. Currently, I have a cooling system available, capable of cooling a thermal load of 52 W, and a cold plate with the dimensions of ... | {
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"id": 3328,
"lm_label": null,
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"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "cooling",
"url": null
} |
galaxy, galaxy-center
Title: Could a dwarf galaxy host a star at the center instead of a SMBH? I don't think this would be possible, but I'm curious, and as what ever query I googled I only found posts about black holes indeed existing, what black holes are, that even the Milky Way has a black hole in its center or th... | {
"domain": "astronomy.stackexchange",
"id": 2523,
"lm_label": null,
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"lm_q2_score": null,
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"openwebmath_score": null,
"tags": "galaxy, galaxy-center",
"url": null
} |
c++, stream, c++20
class Block {
public:
//! each block is this many bytes
static constexpr std::size_t mysize{0x100};
//! read a block
friend std::istream& operator>>(std::istream& in, Block& blk);
//! write a block
friend std::ostream& operator<<(std::ostream& out, const Block& blk);
//... | {
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "c++, stream, c++20",
"url": null
} |
differentiation, variational-principle, calculus
Title: When can I treat derivative as a fraction? (Brachistochrone) My teacher was solving the Brachistochrone problem in class. She parametrized the required path with $x(y)$, then said $T=\int_0^Tdt=\int_{y_1}^{y_2}\frac{dt}{dy}dy=\int_{y_1}^{y_2}\frac{dy}{dy/dt}$. Wh... | {
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "differentiation, variational-principle, calculus",
"url": null
} |
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