text stringlengths 1 1.11k | source dict |
|---|---|
Example $$\PageIndex{1}$$
The rows in Table 5.0.1 bear out Theorems 5.1.1 and 5.1.2: each cyclic subgroup (row) has a number of elements which divides the corresponding $$\phi(n)$$, and powers of the generator $$a$$ are only defined up to $$\ord_n(a)$$. | {
"domain": "libretexts.org",
"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9936116781444259,
"lm_q1q2_score": 0.8029050155190001,
"lm_q2_score": 0.8080672089305841,
"openwebmath_perplexity": 66.41001582374132,
"openwebmath_score": 0.9784016013145447,
"tags":... |
quantum-mechanics, quantum-spin
For electrons in a hydrogen atom s = 1/2 so $\chi_s$ is a two dimensional column vector.
The spin operator $S$ acts on the spin part of the total state $\Psi$, which is a 2x1 column vector and as such can be acted on by a 2x2 matrix. | {
"domain": "physics.stackexchange",
"id": 33811,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "quantum-mechanics, quantum-spin",
"url": null
} |
ros2
By changing the integer values to doubles, MoveIt will correctly interpret the joint limits and prevent the InvalidParameterTypeException error.
I hope this solution helps anyone who may encounter this issue while using the MoveIt2 Setup Assistant. If you have any further questions or need clarification, feel fre... | {
"domain": "robotics.stackexchange",
"id": 38399,
"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": "ros2",
"url": null
} |
homework-and-exercises, forces, vectors, free-body-diagram, statics
P.S. I assumed the fulcrum is above the chain in the centre for simplicity, but it can be placed anywhere, and the end results come out the same. | {
"domain": "physics.stackexchange",
"id": 99482,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "homework-and-exercises, forces, vectors, free-body-diagram, statics",
"url": nul... |
c++, serialization, type-safety
cursorPos += sizeof(Num);
return number;
}
}
// example_main.cpp
#include <cstdint>
#include <vector>
#include <iostream>
//#include "Serialization.h"
using u8 = uint8_t;
using f32 = float;
using f64 = double;
int main()
{
std::vector<std::byte> byteStream;
cons... | {
"domain": "codereview.stackexchange",
"id": 45026,
"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++, serialization, type-safety",
"url": null
} |
ds.algorithms, np-hardness, tree, optimization, application-of-theory
For ti = (2b + 1)i, 1≤i≤k, there is a 3-partition if and only if Bob can sell for 2bΣ1≤i≤k ti:
If there is a solution for 3-partition, then all the b products corresponding to objects wi, wj, wl that are assigned to the same bin can be labeled with ... | {
"domain": "cstheory.stackexchange",
"id": 662,
"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": "ds.algorithms, np-hardness, tree, optimization, application-of-theory",
"url": nu... |
kinematics
Title: How does this graph mean infinite velocity and acceleration?
How does this graph tell us that the acceleration and velocity is infinite . I am not able to get it. I think both of them say finite velocity and acceleration. The graph to the left shows a velocity that reduces at a constant rate then in... | {
"domain": "physics.stackexchange",
"id": 78085,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "kinematics",
"url": null
} |
ros, navigation, ekf, navsat-transform, robot-localization
Are you actually feeding it an IMU message with a compass in it, or just an IMU message with a 0 heading? Can you post an IMU message?
Comment by Tom Moore on 2015-08-05:
Can you please post your updated launch file? Your bag file does not contain an /imu/data... | {
"domain": "robotics.stackexchange",
"id": 22344,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "ros, navigation, ekf, navsat-transform, robot-localization",
"url": null
} |
formal-grammars, parsers
State 4
0 $accept: S $end .
$default accept
State 5
2 A: B 'b' .
$default reduce using rule 2 (A)
State 6
3 B: B 'a' .
$default reduce using rule 3 (B)
In State 0, the closure rule has added the epsilon production (line 4). Furthermore, no item in the state 0 i... | {
"domain": "cs.stackexchange",
"id": 3752,
"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-grammars, parsers",
"url": null
} |
black-holes
On the free fall trajectory towards the singularity, the system is disrupted by tidal forces, or gravitational gradients. Classically, when
$$m_eg(r+a_0) - m_eg(r-a_0)
\approx R_{\infty} $$
you would expect the atomic shells to be thoroughly disrupted. Here $g(r)$ is equivalent "local gravitational accele... | {
"domain": "physics.stackexchange",
"id": 75189,
"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": "black-holes",
"url": null
} |
ros, ros-hydro, turtlebot-calibration
started roslaunch server http://192.168.0.102:50748/
SUMMARY
========
PARAMETERS
* /camera/depth_registered/rectify_depth/interpolation
* /camera/depthimage_to_laserscan_loader/output_frame_id
* /camera/depthimage_to_laserscan_loader/range_min
* /camera/depthimage_to_lasersc... | {
"domain": "robotics.stackexchange",
"id": 19163,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "ros, ros-hydro, turtlebot-calibration",
"url": null
} |
bigdata, relational-dbms
If for some reason you must store a dense distance matrix, a format such as HDF5 would be more efficient than an RDBMS. | {
"domain": "datascience.stackexchange",
"id": 190,
"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": "bigdata, relational-dbms",
"url": null
} |
ros, node, rosjava
Title: Running rosjava tutorial examples
Tried usual searches to see if anyone else was seeing this, but when I run:
rosrun rosjava_bootstrap run.py rosjava_tutorial_pubsub org.ros.tutorials.pubsub.Listener
I get an error that says:
Loading node class: org.ros.tutorials.pubsub.Listener
Exception in... | {
"domain": "robotics.stackexchange",
"id": 7399,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "ros, node, rosjava",
"url": null
} |
quantum-field-theory, research-level, gauge-theory, yang-mills, gauge-symmetry
I would have thought that non-Abelian Yang-Mill's theory has no genuine free limit since it always has the three and the four point gauge vertices at any non-zero value of the coupling however arbitrarily small. This seemed consistent with... | {
"domain": "physics.stackexchange",
"id": 3260,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "quantum-field-theory, research-level, gauge-theory, yang-mills, gauge-symmetry",
... |
terminology, radioactivity
(Typos corrected above, in "SIP-spheres" and in Bremsstrahlung (or Bremßtrahlung, if you prefer).
So it appears that:
Y-90s is calibrated for (plastic) syringe,
Y-90v is calibrated for vial, and
Y-90ss is calibrated for SIR-Spheres, i.e., encapsulated in Sirtex resin microspheres.
And all t... | {
"domain": "chemistry.stackexchange",
"id": 15859,
"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": "terminology, radioactivity",
"url": null
} |
elimination (or negation introduction) is still a valid rule, so if you define "irrational" as "not rational" you can still prove irrationality of$\sqrt{2}$in intuitionistic logic. Some people even define "$\neg A$" as "$A \rightarrow \bot$" when they rewrite everything is in terms of implication and use only modus pon... | {
"domain": "stackexchange.com",
"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9814534365728416,
"lm_q1q2_score": 0.8135648379880788,
"lm_q2_score": 0.8289388040954683,
"openwebmath_perplexity": 567.1055099581736,
"openwebmath_score": 0.6970574259757996,
"tag... |
javascript, performance, algorithm, strings, edit-distance
back in the bar and was waiting for a drink, Luke talking to Sasha, the Montenegrin expatriate, Sasha saying that the reason he gets so many girls is because he knows which shoes to buy, denies up and down that it has anything to do with his accent because tha... | {
"domain": "codereview.stackexchange",
"id": 20769,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "javascript, performance, algorithm, strings, edit-distance",
"url": null
} |
homework-and-exercises, radioactivity
Hence, for this decay, the difference in the atomic masses is indeed the Q-value (ie kinetic energy) of the emitted electron + anti-neutrino.
I hope this helps.
Sources: See here for the latest atomic masses | {
"domain": "physics.stackexchange",
"id": 50718,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "homework-and-exercises, radioactivity",
"url": null
} |
neural-network, aggregation
For forward propagation in a fixed network topology, I would associate to neuron $j$ a vector of weights $(w_{ij})_{i\in I_j}$, where $I_j$ is the set of neurons that bring information to $j$ (those $i$ where there exists a directed edge from $i$ to $j$). Then you could either cherry-pick t... | {
"domain": "datascience.stackexchange",
"id": 3007,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "neural-network, aggregation",
"url": null
} |
matlab, frequency-response, bandpass, digital-filters, speech-synthesis
Note as Olli pointed out in previous comments now deleted, the actual resonant frequency will vary slightly from $f_r$; for more on that see his detailed analysis at Precise Centre frequency of an All-pole digital filter
UPDATE
A reasonable approx... | {
"domain": "dsp.stackexchange",
"id": 7031,
"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": "matlab, frequency-response, bandpass, digital-filters, speech-synthesis",
"url": null... |
c, library, ascii-art, dynamic-loading
"d88888P'",
" ",
" ",
" " }));
return 0;
}
int whimsy_exit(void){
for(int i=0;i<whimsy.d_n;i++)
for(int j=0;j<whimsy.c;j++)
free(whimsy.d[i][j]);
for(int i=0;i<whimsy.d_n;i++)
fr... | {
"domain": "codereview.stackexchange",
"id": 15856,
"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, library, ascii-art, dynamic-loading",
"url": null
} |
c#, object-oriented, design-patterns, inheritance, serialization
Title: Abstract base class for binary serialization Ensuring that some logic is always being run before the user's overriding methods.
I'm writing a library and I have some abstract classes that can be binary serialized (and users can subclass them and f... | {
"domain": "codereview.stackexchange",
"id": 44247,
"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#, object-oriented, design-patterns, inheritance, serialization",
"url": nul... |
the response of the antenna at a given direction.$\begingroup$@Martin: If I'm understanding what you're describing, that doesn't increase the efficiency at all. Here we have a circle of radius r = 1 (hence "unit circle"), a point (x, y) on that circle, and perpendiculars from the point to the x and y axes. ** Given coo... | {
"domain": "preditrend-armand.com",
"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9873750484894196,
"lm_q1q2_score": 0.8140531260164027,
"lm_q2_score": 0.8244619177503206,
"openwebmath_perplexity": 345.51348512255754,
"openwebmath_score": 0.8277813196182251,
... |
javascript, jquery, html
$("select[name=banner_type] option[value=9]").hide();
} else {
// PASSENGER
$("select[name=banner_type] option[value=15]").hide();
$("select[name=banner_type] option[value=17]").hide();
$("select[name=banner_type] option[value=19]").hide();
$("select... | {
"domain": "codereview.stackexchange",
"id": 7851,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "javascript, jquery, html",
"url": null
} |
Because the graph can be drawn in these four ways, all of which are identical except for the node coloring, it is apparent that the blue node is the same as the node in the upper left, upper right, lower left, and lower right corners of the first graph. That shows all nodes are equivalent. (Intuitively, each node "sees... | {
"domain": "stackexchange.com",
"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9840936050226358,
"lm_q1q2_score": 0.8091110676095838,
"lm_q2_score": 0.8221891327004132,
"openwebmath_perplexity": 204.79649167991508,
"openwebmath_score": 0.8089504241943359,
"ta... |
quantum-mechanics, operators, hilbert-space
$$
\langle \hat{a} \rangle = \langle \psi | \hat{a} | \psi \rangle
$$Recall now that $\langle \phi | \hat{O} | \psi\rangle^* = \langle \psi | \hat{O}^\dagger|\phi\rangle$. An intuitive picture for this relation comes from the matrix element interpretation of these objects - ... | {
"domain": "physics.stackexchange",
"id": 49960,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "quantum-mechanics, operators, hilbert-space",
"url": null
} |
data-structures
Title: when to use preorder, postorder and inorder binary search tree traversal strategies What are some examples of when to use preorder/postorder practically? When does it make more sense than in-order? "Whatever you want in your application. This is like asking when you should drink beer, orange jui... | {
"domain": "cs.stackexchange",
"id": 12435,
"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": "data-structures",
"url": null
} |
newtonian-mechanics, fluid-dynamics, forces, pressure
The only explanation I can think of to them extending one at a time is that the pressure relief valve (shown in the picture below, just to the left of the switch) plays some part. The pressure relief valve works exactly as the picture makes it look like it would. i... | {
"domain": "physics.stackexchange",
"id": 29339,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "newtonian-mechanics, fluid-dynamics, forces, pressure",
"url": null
} |
laser, cold-atoms
The mixing frequency creates side bands at $f+-\Omega$; these have to be "far from" the resonance of the FP resonator, which sets a minimum frequency; but since the frequency is also needed when you mix down for the detection of the error signal I suspect that smog it too large will give rise to erro... | {
"domain": "physics.stackexchange",
"id": 27588,
"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": "laser, cold-atoms",
"url": null
} |
php, unit-testing
public function testII(){
$rmc = new RMC("II");
if ($rmc->intVal()===2)return TRUE;
return FALSE;
}
public function testIII(){
$rmc = new RMC("III");
if ($rmc->intVal()===3)return TRUE;
return FALSE;
}
public function testVI(){
$... | {
"domain": "codereview.stackexchange",
"id": 35128,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "php, unit-testing",
"url": null
} |
electromagnetism, electrostatics, gauss-law
Title: Knowing when Gauss's Law is useful I'd like to know whether my sense of Gauss's Law is correct here.
Suppose I have a cube of side length $L$ filled uniformly with electric charge. Let's say I use as my integration surface a cube enveloping the cube of charge that has... | {
"domain": "physics.stackexchange",
"id": 55338,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "electromagnetism, electrostatics, gauss-law",
"url": null
} |
mathematics, complexity-theory, nonlocal-games, mip-star
Rolling back the implications of Tsirelson and others, this implies a negative answer to Connes' Embedding Problem, which is a major problem in algebra theory.
I can get my head around the complexity class $\mathrm{MIP^*}$ and that of $\mathrm{RE}$. Thanks to Y... | {
"domain": "quantumcomputing.stackexchange",
"id": 1859,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "mathematics, complexity-theory, nonlocal-games, mip-star",
"url": null
} |
performance, beginner, c, hash-map
Variable Declarations
A best practice in most programming languages is to declare a single variable per line. In the C and C++ programming languages this best practice also suggests that each variable be initiated on that line as well since neither language provides default values fo... | {
"domain": "codereview.stackexchange",
"id": 44486,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "performance, beginner, c, hash-map",
"url": null
} |
If you instead compute it for $n=1$, you get something else: \begin{align} \sqrt[3]{x}\cdot\mathrm e^{2\pi i\cdot1/3}=\sqrt[3]{x}\cdot\mathrm e^{2\pi i/3} \end{align} If you happen to know a bit about the complex exponential function, you know that $\mathrm e^{2\pi i} = 1$, so if we cube the value above, we get: \begin... | {
"domain": "stackexchange.com",
"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9888419690807408,
"lm_q1q2_score": 0.8152625547103088,
"lm_q2_score": 0.8244619263765706,
"openwebmath_perplexity": 276.4221955937387,
"openwebmath_score": 0.9985100030899048,
"tag... |
electromagnetism, magnetic-fields, boundary-conditions, gauge
Title: Uniqeness of Coulomb gauge Say I have some magnetic vector potential $A$ which is not in Coulomb gauge, meaning $\nabla \cdot A \neq 0$. I can set it to Coulomb gauge by adding some scalar potential function $\nabla \phi$ (and that's okay because the... | {
"domain": "physics.stackexchange",
"id": 68427,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "electromagnetism, magnetic-fields, boundary-conditions, gauge",
"url": null
} |
c#
Getting the user nodes becomes
var userNodes = GetNodesFromQuery(userKey, onlineReports, _QueryPermissions.GetQueriesForTaskAndUser);
Getting the group node
var groupNodes = GetNodesFromQuery(groupKey, onlineReports, _QueryPermissions.GetQueriesForTaskAndUserGroup); | {
"domain": "codereview.stackexchange",
"id": 8322,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "c#",
"url": null
} |
c++, c++11, pointers, vectors
sizeVector -= temp;
return last;
}
template<typename DT>
Iterator<DT> Vector<DT>::insert(Iterator<DT> pos, const DT & value){
int i = 0;
if (capacityVector > sizeVector){
for(Iterator<DT> it = tab + sizeVector; it != pos; it--, i++)
tab[sizeVector - i] =... | {
"domain": "codereview.stackexchange",
"id": 24090,
"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++, c++11, pointers, vectors",
"url": null
} |
python, algorithm, game, pathfinding, a-star
I think that makes it a lot easier to see what's going on in it.
Again, in many places you're assigning two or more variables on one line:
(x1, y1), (x2, y2) = self.start, end
current, path = endPoint, []
openList, closedList, nodeDict = [], [], {}
x1, y1, y2, x2 = coordin... | {
"domain": "codereview.stackexchange",
"id": 39244,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "python, algorithm, game, pathfinding, a-star",
"url": null
} |
classical-mechanics, gravity, orbital-motion, moon
Title: How much force would it take for you stop the Moon from crashing into the earth once it has started to fall? In my previous question, I asked how much force it would take to destabilize the Moon's orbit enough for the moon to start falling into the Earth and co... | {
"domain": "physics.stackexchange",
"id": 28023,
"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, gravity, orbital-motion, moon",
"url": null
} |
c++, matrix, mathematics, c++14, opengl
inline Matrix4x4& operator+=(const Matrix4x4& rhs)
{
for(int i = 0; i < 16; i++)
{
this->m_elements[i] += rhs.m_elements[i];
}
return *this;
}
inline Matrix4x4& operator-=(const Matrix4x4& rhs)
{
for(int i = 0;... | {
"domain": "codereview.stackexchange",
"id": 34693,
"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++, matrix, mathematics, c++14, opengl",
"url": null
} |
ros, navigation, costmap, local-costmap, 2dcostmap
Original comments
Comment by Arwen on 2016-07-15:
costmap_2d has a parameter called robot_base_frame, I think there might be something wrong with this parameter. If the frame you set for this parameter is not the center of the footprint, well, the costmap won't be in ... | {
"domain": "robotics.stackexchange",
"id": 25245,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "ros, navigation, costmap, local-costmap, 2dcostmap",
"url": null
} |
organic-chemistry, spectroscopy, ir-spectroscopy
The presence of remaining propanol may be confirmed by 1H NMR, too (remember that solvents like $\ce{CDCl3}$ more likely provide an OH signal that is broad, while d6-DMSO with slow H-D exchange rates a multiplet signal; and a droplet of $\ce{D2O}$ may mute the OH-signal... | {
"domain": "chemistry.stackexchange",
"id": 7786,
"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": "organic-chemistry, spectroscopy, ir-spectroscopy",
"url": null
} |
The key word here is must. I.e., the statement claims that every system of linear equations with more equations than unknowns is inconsistent. That’s false. For example, the system \begin{align} x &= 1 \\ 2x &= 2 \end{align} has two equations and one unknown, but is clearly consistent. | {
"domain": "stackexchange.com",
"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9799765549093694,
"lm_q1q2_score": 0.8123406038214929,
"lm_q2_score": 0.8289388146603365,
"openwebmath_perplexity": 392.145927831555,
"openwebmath_score": 0.9398319125175476,
"tags... |
physical-chemistry, nanoscience
either has to (1) change the pressure and temperature conditions so that the diamond phase of carbon does become the energetically stable phase or (2) use some sort of non-equilibrium process to make diamond out of carbon (e.g., microwave chemical vapor deposition). | {
"domain": "physics.stackexchange",
"id": 40107,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "physical-chemistry, nanoscience",
"url": null
} |
go, io
return string(out)
}
Motivational full example
main.go
package main
import "fmt"
func main() {
fmt.Println("Hello, World!")
}
main_test.go
package main
import (
"io"
"os"
"testing"
)
func Test_main(t *testing.T) {
want := "Hello, World!\n"
got := captureStdout(main)
if got != w... | {
"domain": "codereview.stackexchange",
"id": 44279,
"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": "go, io",
"url": null
} |
quantum-mechanics, hilbert-space, symmetry, group-theory, representation-theory
If my proof is correct, it seems that the basis vectors do not even need to be orthogonal, as long as they are linearly independent. Is that true?
The vector space here can be any vector space, as long as they have well-defined innerproduc... | {
"domain": "physics.stackexchange",
"id": 80725,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "quantum-mechanics, hilbert-space, symmetry, group-theory, representation-theory",
... |
Suppose that someone gives us a function $g$ that satisfies $g(-1) = g(-2) = 1$, $g(n+2) = (g(n) + g(n+5))/2$ for $n\geq 0$, and $g(n)\to 0$ as $n\to\infty$. Since such a function must have the form $A_1x_1^n+\cdots+A_5x_5^n$, it is easy to see that all the values have to be in the interval $[0,1]$ (there could not be ... | {
"domain": "mathoverflow.net",
"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9852713857177956,
"lm_q1q2_score": 0.8167296945956567,
"lm_q2_score": 0.8289388146603365,
"openwebmath_perplexity": 125.62264444457085,
"openwebmath_score": 0.9337767362594604,
"tag... |
# Advantage/acceptability of using contrast codes to conduct pair-wise comparison vs. t-test on subset of data?
I conducted a study with three conditions (A, B, and C) and I want to test the difference between A and C. My default approach would be to run a t-test (or its equivalent) on a subset of the data (excluding ... | {
"domain": "stackexchange.com",
"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9820137895115187,
"lm_q1q2_score": 0.8005695484056349,
"lm_q2_score": 0.8152324915965392,
"openwebmath_perplexity": 237.46375886418477,
"openwebmath_score": 0.5076346397399902,
"ta... |
java, algorithm, strings, compression
newString += "" + key + "" + value;
}
return newString
}
} For better performance you should be able to eliminate the Hashmap and use a StringBuilder to count and build the compressed string in one operation:
public static String Compress(String input)
{
S... | {
"domain": "codereview.stackexchange",
"id": 33803,
"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, algorithm, strings, compression",
"url": null
} |
astronomy, education, measurements, particle-detectors, cosmic-rays
With cosmic rays the bulk of the impinging particles are muons, so you can just assume the species instead of doing a proper job of PID.
A RICH modification would presumably have a single element bi-planer lens made out of some very clear glass or pl... | {
"domain": "physics.stackexchange",
"id": 11636,
"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": "astronomy, education, measurements, particle-detectors, cosmic-rays",
"url": nul... |
algorithms, dynamic-programming, arithmetic, linear-programming
Title: Closest arithmetic progression to an array Given an array of $N$ integers, having the option to increase or decrease its elements, the problem is to find the closest integer arithmetic progression. That corresponds to the smallest difference betwee... | {
"domain": "cs.stackexchange",
"id": 8002,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "algorithms, dynamic-programming, arithmetic, linear-programming",
"url": null
} |
fft, power-spectral-density, bandpass, butterworth
Hampel filter (for significant outlier removal)
Running mean filter (for smoothing)
Butterworth bandpass filter (to isolate potential breathing frequencies)
Once this has been done, a heatmap of amplitude across the subcarrier spectrum can be produced which should sh... | {
"domain": "dsp.stackexchange",
"id": 7934,
"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": "fft, power-spectral-density, bandpass, butterworth",
"url": null
} |
ros, eigen, ubuntu, ubuntu-precise, eigen3
Originally posted by rkeatin3 on ROS Answers with karma: 156 on 2014-12-08
Post score: 0
I solved this problem by doing the following:
Download this file: [http://bitbucket.org/eigen/eigen/get/3.2.2.tar.gz](Download this file: http://bitbucket.org/eigen/eigen/get/3.2.2.tar.... | {
"domain": "robotics.stackexchange",
"id": 20280,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "ros, eigen, ubuntu, ubuntu-precise, eigen3",
"url": null
} |
c++, performance, collections, c++20, memory-optimization
[[nodiscard]] bool operator!=(const CompactSet &other) const { return !(*this == other); }
[[nodiscard]] bool empty() const { return size_ == 0; }
[[nodiscard]] bool full() const { return size_ == bits.size(); }
[[nodiscard]] size_type size() c... | {
"domain": "codereview.stackexchange",
"id": 45405,
"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++, performance, collections, c++20, memory-optimization",
"url": null
} |
To prove that $D$ is connected, argue by contradiction. Suppose that $D$ is not connected, so we can find closed subsets $A,B \subset X$ such that $D \subset A \cup B$ and $A \cap D \neq \emptyset$ and $B \cap D \neq \emptyset$ and $A \cap B \cap D = \emptyset$. Notice that for any $C \in \mathfrak{C}$, the set $A \cap... | {
"domain": "stackexchange.com",
"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9802808690122164,
"lm_q1q2_score": 0.8014526201839431,
"lm_q2_score": 0.817574478416099,
"openwebmath_perplexity": 50.3718358026371,
"openwebmath_score": 0.9751887917518616,
"tags"... |
c++, c++11, thread-safety, collections, lock-free
a.push_front(y, std::memory_order_relaxed, std::memory_order_relaxed);
std::this_thread::sleep_for(std::chrono::microseconds(rand() % 50));
int x;
a.pop_front(x, std::memory_order_relaxed, std::mem... | {
"domain": "codereview.stackexchange",
"id": 12394,
"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++, c++11, thread-safety, collections, lock-free",
"url": null
} |
performance, console, assembly, memory-optimization, text-editor
mov [bp+128+12+si], ax
mov [bp+si], dx
cmp si, -12
jg @b
ret
.s11_Bad:
mov word [bp+268+14], 0 ;pusha.AX is NEWKEY Throw away
ret ; inv... | {
"domain": "codereview.stackexchange",
"id": 30166,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "performance, console, assembly, memory-optimization, text-editor",
"url": nul... |
php, sql, mysqli
return $return;
}
/* Returns whether the MySQL connection has been established */
public static function connected()
{
return is_resource(self::$mysqli);
}
/* Returns the MySQL connection resource */
public static function obj()
{
return self::$mysqli... | {
"domain": "codereview.stackexchange",
"id": 1116,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "php, sql, mysqli",
"url": null
} |
quantum-information, quantum-entanglement, biophysics
I mean, if I do not neglect electron-electron interaction, then pretty much all electrons in a condensed matter system are entangled, are they not? | {
"domain": "physics.stackexchange",
"id": 826,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "quantum-information, quantum-entanglement, biophysics",
"url": null
} |
gazebo, ros2, turtlebot
How do I set the initial pose? I know that you can do it via Rviz, but in this case I want to solve it without RViz (with a command or programmatically via rclpy).
Originally posted by RamiAW on ROS Answers with karma: 13 on 2021-05-18
Post score: 1
Two options that I know of if you do not wa... | {
"domain": "robotics.stackexchange",
"id": 36435,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "gazebo, ros2, turtlebot",
"url": null
} |
in position i rolls 6 first}\right)=P\left(\bigcup_{n=1}^{\infty}\textrm{Person in in positon i rolls 6 first on turn n}\right)=\sum_{n=1}^{\infty}P\left(\textrm{Person in in positon i rolls 6 first on turn n}\right)=\sum_{i=1}^{\infty}\left(\frac{5}{6}\right)^{(i-1)+3(n-1)}\left(\frac{1}{6}\right)=\sum_{i=0}^{\infty}\... | {
"domain": "stackexchange.com",
"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9678992923570262,
"lm_q1q2_score": 0.8107317697744088,
"lm_q2_score": 0.8376199633332891,
"openwebmath_perplexity": 330.8353174818097,
"openwebmath_score": 0.8382211327552795,
"tag... |
java
If you only want singular edges between vertices then you should explicitly skip if a v can be found with a w in the list. In that case you might be better off using a SortedSet such as a TreeSet.
If you allow your vertices and edges to be counted then you you would not have the trouble of keeping more state tha... | {
"domain": "codereview.stackexchange",
"id": 37543,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "java",
"url": null
} |
neural-networks, backtracking
$\dfrac{\partial L}{\partial w^{[ 1]}} =\dfrac{\partial L}{\partial a^{[ 2]}} \cdot \dfrac{\partial a^{[ 2]}}{\partial w^{[ 1]}}$
Image credits: https://www.mathcha.io You described the simplest case of the neural network, where the center neuron has only one output $a$, which is connecte... | {
"domain": "cs.stackexchange",
"id": 10504,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "neural-networks, backtracking",
"url": null
} |
angular-momentum, inertial-frames, rigid-body-dynamics, angular-velocity, precession
I apologize for the overload of questions. Please let me know if they are confusing.
Thank you all in advance. Yeah, this an overload of questions.
Recommendation: look up information about the case that is known as 'Feynman's wobblin... | {
"domain": "physics.stackexchange",
"id": 89307,
"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": "angular-momentum, inertial-frames, rigid-body-dynamics, angular-velocity, precessi... |
c, matrix, opengl
static double iData[] = { 1, 0, 0, 0,
0, 1, 0, 0,
0, 0, 1, 0,
0, 0, 0, 1 };
static mat4* mMat(mat4* out, const double* data)
{
out->m[0] = data[0];
out->m[4] = data[4];
out->m[8] = data[8];
out->m[12] = ... | {
"domain": "codereview.stackexchange",
"id": 14999,
"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, matrix, opengl",
"url": null
} |
quantum-mechanics, special-relativity, mass
Title: Do we have rest mass according to quantum physics? I know wave must be in motion and resonant waves are actually in motion. So I don't understand what is a rest mass of a particle. If a particle is just a wave in a particular field, it should be moving and it can't be... | {
"domain": "physics.stackexchange",
"id": 30617,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "quantum-mechanics, special-relativity, mass",
"url": null
} |
php, object-oriented, mysql, pdo
// Parameter type.
if (is_string($value)) {
// Parameter is a string.
$type = PDO::PARAM_STR;
} elseif (is_int($value)) {
// Parameter is a integer.
... | {
"domain": "codereview.stackexchange",
"id": 24580,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "php, object-oriented, mysql, pdo",
"url": null
} |
homework-and-exercises, newtonian-mechanics, free-body-diagram, string
Title: Tension acting on ropes with several pulleys [1]
Find the force $F$ that makes the mass go down with constant velocity, given that the mass is $300kg$ and neglect the mass of the pulleys. | {
"domain": "physics.stackexchange",
"id": 77666,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "homework-and-exercises, newtonian-mechanics, free-body-diagram, string",
"url": ... |
Point Symmetry. In the same way, a regular hexagon has an angle of symmetry as 60 degrees, a regular pentagon has 72 degrees, and so on. A trapezium has rotational symmetry of order one. The order of rotational symmetry is the number of times the shape maps onto itself during a rotation of 360°. A geometric figure or s... | {
"domain": "gridserver.com",
"id": null,
"lm_label": "1. YES\n2. YES\n\n",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9585377249197138,
"lm_q1q2_score": 0.8108677411321988,
"lm_q2_score": 0.845942439250491,
"openwebmath_perplexity": 440.5843512704106,
"openwebmath_score": 0.6536144018173218,
"tag... |
asymptotics, recurrence-relation
$$
Raising to the power $1/(1+2/\sqrt{n})$, and defining $p = (a_n + 1/\sqrt{n})/(1 + 2/\sqrt{n})$, we get
$$
p^p (1-p)^{1-p} \leq \frac{1}{n^{(2/\sqrt{n})/(1+2/\sqrt{n})}(1+2/\sqrt{n})}.
$$
The left-hand side is $1/\exp h(p)$, where $h(p)$ is the entropy function. Hence it is maximize... | {
"domain": "cs.stackexchange",
"id": 16269,
"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": "asymptotics, recurrence-relation",
"url": null
} |
trees, dynamic-programming
KDTree<Boolean> tree = new KDTree<>(2); //2 dimensions
tree.put(3, 7, 1); //You could ommit the '1', since all entries will have a '1'. | {
"domain": "cs.stackexchange",
"id": 11202,
"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": "trees, dynamic-programming",
"url": null
} |
wpf, xaml
<DockPanel Grid.Row="1" Grid.Column="0" LastChildFill="True" Width="Auto"
Height="Auto" HorizontalAlignment="Stretch" VerticalAlignment="Stretch" Margin="10,0,0,0" >
<Grid Width="Auto" Height="Auto" VerticalAlignment="Stretch" HorizontalAlignment="Left">
<Grid.... | {
"domain": "codereview.stackexchange",
"id": 16792,
"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": "wpf, xaml",
"url": null
} |
units, conventions, si-units, metrology
As to the dependency of the standards, it's clear that the mole depends only on the chosen value of $N_A$. However, to actually implement it one needs a bunch of additional technology, which brings in a whole host of metrological issues and dependence on additional standards, bu... | {
"domain": "physics.stackexchange",
"id": 27975,
"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": "units, conventions, si-units, metrology",
"url": null
} |
Calculator, do the following: Choose "Count combinations" as the analytical goal. The elements do not need to be the same. Sets N, Z, D and Q are included in the set R. Any number in N or Z or D or Q is also in R. I is the set of (pure) imaginary numbers, that is to say complex numbers without real parts, the square ro... | {
"domain": "zezenbeltz.eus",
"id": null,
"lm_label": "1. YES\n2. YES\n\n",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.975946446405965,
"lm_q1q2_score": 0.8111510958483881,
"lm_q2_score": 0.8311430394931456,
"openwebmath_perplexity": 685.1780129295474,
"openwebmath_score": 0.6768036484718323,
"tag... |
python, c++, programming-challenge
#include <vector>
std::vector<int> get_spiral(const std::vector<std::vector<int>> &matrix);
#endif //LEETCODE_SPIRAL_MATRIX_H
spiral_matrix.cpp
#include "spiral_matrix.h"
#include <chrono>
#include <iostream>
static void
add_borders(size_t start_width, size_t start_height, std::v... | {
"domain": "codereview.stackexchange",
"id": 39975,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "python, c++, programming-challenge",
"url": null
} |
square and the other is a rectangle 18 cm longer than the square but 9 cm less wide than the square. Solution:Given; Length of the garden = 90m, Width of the garden = 75m, Width of the path around the garden = 5m. 1415 \times 225 = 706. How to calculate the area of a square or rectangle. docx from MATH 15 at Delhi Publ... | {
"domain": "aidmbergamo.it",
"id": null,
"lm_label": "1. Yes\n2. Yes",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9773708026035286,
"lm_q1q2_score": 0.8326737956770336,
"lm_q2_score": 0.8519528038477824,
"openwebmath_perplexity": 642.7273038915572,
"openwebmath_score": 0.544926106929779,
"tags": ... |
frequency, software
I am generating numbers using $y = |10^3 \cdot sin(\frac{1}{x})|$ in some interval near 0. Doing this, you end up with numbers all over the place, but I want to call them musical frequencies. What I want to do is play these frequencies sequentially. I basically want to demonstrate the erratic osci... | {
"domain": "physics.stackexchange",
"id": 62172,
"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": "frequency, software",
"url": null
} |
java, beginner, calculator, gui, javafx
button.setPrefHeight(buttonHeight);
numberButtons.add(button);
numberGrid.add(button, x, y);
}
}
String[][] operatorTextArr = {{"+", "-"}, {"*", "/"}, {"=", "c"}};
for(int y = 0; y < operatorTextArr.length; y++)... | {
"domain": "codereview.stackexchange",
"id": 18188,
"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, beginner, calculator, gui, javafx",
"url": null
} |
optics, reflection, geometric-optics
\tag{01a}\label{01a}\\
\texttt{where} \quad \omega_{\texttt A} &\boldsymbol{=}\arccos{\left(R/a\right)}\in \left[0,\pi/2\right]
\tag{01b}\label{01b}
\end{align}
and $\,R\boldsymbol{=}\text{the mirror radius}$,$\,a\boldsymbol{=}\text{distance of the fixed point $\,\texttt A\,$ from... | {
"domain": "physics.stackexchange",
"id": 80477,
"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": "optics, reflection, geometric-optics",
"url": null
} |
ros, kdl, robot, ros-groovy
Originally posted by Stefan Kohlbrecher with karma: 24361 on 2014-06-17
This answer was ACCEPTED on the original site
Post score: 1
Original comments
Comment by Dante on 2014-06-20:
hi thanks for you answer. I find that https://github.com/kouretes/NAOKinematics. I want to calculate the cen... | {
"domain": "robotics.stackexchange",
"id": 18283,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "ros, kdl, robot, ros-groovy",
"url": null
} |
quantum-gate
For any $n$-qubit unitary $U$, the matrix of its controlled version $c$-$U$ can be given as $\begin{bmatrix}
I & 0 \\
0 & U \\
\end{bmatrix}$ where $I$ is the identity matrix of size $2^n$ and $0$ is the zero matrix of size $2^n$. This is quite simple. But when you try to obtain the matrix corresp... | {
"domain": "quantumcomputing.stackexchange",
"id": 2222,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "quantum-gate",
"url": null
} |
particle-physics, experimental-physics, mass, neutrinos
Title: Speed of neutrinos Everyone knows it is close to $c$, but how close? What are the recent results? Your question is equivalent to asking what the absolute mass of the neutrinos is, and the answer is currently unknown. We do have decent values for the differ... | {
"domain": "physics.stackexchange",
"id": 29467,
"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": "particle-physics, experimental-physics, mass, neutrinos",
"url": null
} |
context-free, formal-grammars, ambiguity
Title: Is a grammar that accepts function declarations, function calls and expressions (at any order!) necessarily cyclic? As the title suggests, assume a grammar which has to recognize function declarations, function calls, and expressions, at any order. Does that mean it has ... | {
"domain": "cs.stackexchange",
"id": 3711,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "context-free, formal-grammars, ambiguity",
"url": null
} |
ros, ros-indigo
Basically, global_plan is what is currently viewed as "follow this path", i.e. the Input to the planner, which is not the full path to the goal. Otherwise, it might be that tremendous shortcuts could appear. How long this is depends on several Parameters, maily those in 2.2.3 of the wiki.
The local pla... | {
"domain": "robotics.stackexchange",
"id": 30456,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "ros, ros-indigo",
"url": null
} |
c#, algorithm, mergesort
Now you can rework and simplify your sorting method and it will be easier to follow your logic. This will aid in debugging it.
You'll notice that I added the ToString overload. This will allow Console.Write to print out the Name of a Motorcycle object without specifically calling the propert... | {
"domain": "codereview.stackexchange",
"id": 30844,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "c#, algorithm, mergesort",
"url": null
} |
acid-base, buffer
&= 4.4819 - 0.602\\
&\approx 3.88 \tag{6}
\end{align}$$
$$\mathrm{pH} = 14 - \mathrm{pOH} = 14 - 3.88 = 10.12\tag{7}$$
However, the book from which I am solving this problem suggests that this problem should not be solved by Henderson equation without providing any reason. Can anyone tell me why th... | {
"domain": "chemistry.stackexchange",
"id": 16774,
"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": "acid-base, buffer",
"url": null
} |
python, python-3.x, web-scraping, stackexchange, beautifulsoup
Title: Soup of the day: best served during election season Community moderator elections on the Stack Exchange network are really exciting.
Alas, on the page of the primaries, I find it mildly annoying that candidates are randomly reordered on every page l... | {
"domain": "codereview.stackexchange",
"id": 14571,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "python, python-3.x, web-scraping, stackexchange, beautifulsoup",
"url": null
... |
variable). Math symbols defined by LaTeX package «esint» No. 7 Triple Integrals in Cylindrical and Spherical Coordinates Example: Find the second moment of inertia of a circular cylinder of radius a about its axis of symmetry. Aplicaciones de de la integral Volumen de sólidos de revolución Definición Sea una función def... | {
"domain": "bollola.it",
"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9802808741970027,
"lm_q1q2_score": 0.8534298480576168,
"lm_q2_score": 0.8705972650509008,
"openwebmath_perplexity": 1024.54283541851,
"openwebmath_score": 0.9065842032432556,
"tags": null... |
homework-and-exercises, electrostatics, charge, conductors
$$\vec\nabla\cdot\vec{E} = \frac{\rho}{\epsilon_0}$$
When $\vec{E}$ is discontinuous, its derivative is "infinite", and therefore $\rho$ needs to be represented as a product involving a delta function. | {
"domain": "physics.stackexchange",
"id": 16561,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "homework-and-exercises, electrostatics, charge, conductors",
"url": null
} |
special-relativity, spacetime, speed-of-light, inertial-frames, geometry
More concretely, we might consider a 1D example. Begin from a reference frame $(x,t)$ in which the Minkowski metric takes the form $\mathrm ds^2 = -c^2\mathrm dt^2 + \mathrm dx^2$ and a photon moves with speed $c$ in the $+\hat x$ direction. We m... | {
"domain": "physics.stackexchange",
"id": 96334,
"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": "special-relativity, spacetime, speed-of-light, inertial-frames, geometry",
"url"... |
java
Originally posted by gvdhoorn with karma: 86574 on 2015-05-14
This answer was ACCEPTED on the original site
Post score: 0
Original comments
Comment by maha on 2015-05-14:
can you explain how can I run my java program from a shell? I'm using eclipse.
Comment by gvdhoorn on 2015-05-14:
Run Eclipse from a properly ... | {
"domain": "robotics.stackexchange",
"id": 21677,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "java",
"url": null
} |
I find this question to be quite intrigueing because it addresses the issue of extending the underlying structure of the field of complex numbers $$\Bbb C$$ to arbitrary fields, in particular to arbitrary finite fields; in a sense we might say it is about the process of complexification, with which we are familiar from... | {
"domain": "stackexchange.com",
"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9843363494503271,
"lm_q1q2_score": 0.8386081109934642,
"lm_q2_score": 0.8519528019683105,
"openwebmath_perplexity": 159.00290261612562,
"openwebmath_score": 0.902271568775177,
"tag... |
climate-change, climate, climate-models
Source: https://skepticalscience.com/print.php?n=1703
Three key transitions can be seen in the above graph. The glacial cycle started to change from a ~41000 year period to a ~100000 year period a bit less than one million years ago. The second transition occurred after MIS 17 w... | {
"domain": "earthscience.stackexchange",
"id": 1886,
"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": "climate-change, climate, climate-models",
"url": null
} |
electromagnetism
Title: Induced electric field outside a solenoid I am currently working through an example out of the Barron's AP Physics C book. This example uses Faraday's law to calculate the induced electric field outside a solenoid. The exact problem is:
The current passing through an infinitely long solenoid o... | {
"domain": "physics.stackexchange",
"id": 78173,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "electromagnetism",
"url": null
} |
c#, .net, xml
Consider implementing the IEquatable<T> interface and other appropriate overrides. If you intend to use this in your code, this could be invaluable.
Consider implementing the IXmlSerializable interface explicitly. If you intend to use this type as you would any other in your code, you probably wouldn't... | {
"domain": "codereview.stackexchange",
"id": 695,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "c#, .net, xml",
"url": null
} |
forces, energy, momentum, conservation-laws, vibrations
Any error, small or large, in this very novel and original explanation by the author, is begged to be pardoned... :D!!
What a relief! But, please do bring any disputes into the comments! | {
"domain": "physics.stackexchange",
"id": 58644,
"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": "forces, energy, momentum, conservation-laws, vibrations",
"url": null
} |
$$103$$
your book has n=404 pages, so the sum of all pages is n(n+1)/2=81810, since the sum must be 81707, the page missing must be 103
if your book had 405 pages, the sum would be 82215, and the page missing would have to be 508 --impossible
if your book had 403 pages, the sum would be 81406, not enough
edit: The ... | {
"domain": "stackexchange.com",
"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9793540734789343,
"lm_q1q2_score": 0.8118245944556531,
"lm_q2_score": 0.8289388040954683,
"openwebmath_perplexity": 684.6146561291658,
"openwebmath_score": 0.6924742460250854,
"tag... |
thermodynamics, electromagnetic-radiation, everyday-life, microwaves
Title: In a microwave oven, why do smaller portions heat up faster? Sorry for brevity, but what is the exact physics explanation of why smaller quantities placed inside a microwave oven heat up faster than when you place a larger quantity of a simila... | {
"domain": "physics.stackexchange",
"id": 75941,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "thermodynamics, electromagnetic-radiation, everyday-life, microwaves",
"url": nu... |
php, object-oriented, php5, laravel
}elseif(!is_null($this->province)){
$and_where[] = "(
bg.province_id=".$this->province."
OR (bg.region_all=1 AND bg.region_id=".$this->getRegionByProvince().")
)";
}elseif(!is_nul... | {
"domain": "codereview.stackexchange",
"id": 20991,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "php, object-oriented, php5, laravel",
"url": null
} |
human-biology, eyes, vision
Use the color smack-dab in the middle aka Green
Make a new one as if they wrapped around
Green is far away and already taken, so our brain intelligently invents Magenta. This produces, instead of a linear EM spectra, a circular color wheel that looks very intuitive. | {
"domain": "biology.stackexchange",
"id": 8370,
"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": "human-biology, eyes, vision",
"url": null
} |
Subsets and Splits
No community queries yet
The top public SQL queries from the community will appear here once available.