text stringlengths 1 1.11k | source dict |
|---|---|
ros, installation, pioneer-3dx
I am not sure but i think the application was build in a wrong folder and i had to copy it manually into my ros workspace.
To your second question, maybe there are buttons on the pioneer to control how fast he drives. I know that there is a button to stop the motors, maybe there are also... | {
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"id": 15994,
"lm_label": null,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "ros, installation, pioneer-3dx",
"url": null
} |
javascript, asynchronous, timer
return host;
} ).call( listener( {} ), delay, repeatCount );
};
//
// attaches Timer fn to global scope
_host_.Timer = _tm;
} )( self, Array.prototype );
//
// use:
//
// var
// tm = Timer( 1000/50 ); // set timers fq to 50 times a sec
//
/... | {
"domain": "codereview.stackexchange",
"id": 4578,
"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, asynchronous, timer",
"url": null
} |
electricity, electric-circuits, electrical-resistance, batteries, electrochemistry
Further, what is the nature of variation of internal resistance with the energy stored in the battery - is it linear or something else? Also, how can a discharged battery have a non-zero emf as stated above ("The internal resistance of ... | {
"domain": "physics.stackexchange",
"id": 65110,
"lm_label": null,
"lm_name": null,
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"lm_q2_score": null,
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"openwebmath_score": null,
"tags": "electricity, electric-circuits, electrical-resistance, batteries, electrochemistry... |
c++, performance
Here's some working code that I use very often when this case pops up.
class IdGenerator
{
typedef std::uint64_t Id;
public:
IdGenerator():
total_ids_(0)
{
}
Id next()
{
Id id;
if (available_ids_.empty())
{
id = total_ids_;
... | {
"domain": "codereview.stackexchange",
"id": 27554,
"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",
"url": null
} |
c, linked-list
node_t *create_new_node(int val) {
node_t *result = malloc(sizeof(node_t));
if (result == NULL)
{
fprintf(stderr, "malloc failed in create_new_node()\n");
return result;
}
result->val = val; // Unknown behavior here if malloc() failed
result->next = NULL;
ret... | {
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"id": 36889,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "c, linked-list",
"url": null
} |
ros, rgbdslam-freiburg
[rosmake-2] Finished <<< smclib ROS_NOBUILD in package smclib
[rosmake-3] Finished <<< rosservice No Makefile in package rosservice
[rosmake-2] Starting >>> bond [ make ]
[rosmake-3] Starting >>> dynamic_reconfigure [ make ]
[rosmake-1] Finished <<< pcl ROS_NOBUILD in package pcl No Makefile in ... | {
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"id": 18122,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "ros, rgbdslam-freiburg",
"url": null
} |
xgboost, loss-function, gradient-boosting-decision-trees
Minimum loss reduction required to make a further partition on a leaf node of the tree. The larger gamma is, the more conservative the algorithm will be.
You can see that from equation (2), the regularized objective:
$$\mathcal{L}(\phi) = \sum_i l(\hat{y}_i, y_... | {
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"id": 9484,
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"lm_name": null,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "xgboost, loss-function, gradient-boosting-decision-trees",
"url": null
} |
java, recursion, tree, depth-first-search
Title: DFS in Binary Tree I have written this code for DFS in a binary tree and would like improvements on it.
// Method 1: Recursive DFS
public static boolean DFS(Node root, int k){
if(root == null){
return false;
} else if (root.data == k){
r... | {
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"id": 15864,
"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, recursion, tree, depth-first-search",
"url": null
} |
predictive-modeling, linear-regression, prediction
Is there a way to calculate the potential accuracy of the price that is predicted? It seems to me if I ask the model to predict on brand x and quality y and the model knows brand x and the quality always produces a tight range of prices the accuracy is potentially hig... | {
"domain": "datascience.stackexchange",
"id": 8706,
"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": "predictive-modeling, linear-regression, prediction",
"url": null
} |
javascript, performance, animation
BeginningTriggeringPoint, EndingTriggeringPoint, Configuration) {
// Get the controlled objects, which will converted to an array with all the IDs if necessary:
this.CO = ControlledObjects instanceof Array ? ControlledObjects.slice() : [ControlledObjects];
// Convert the ... | {
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"id": 29662,
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"lm_name": null,
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"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "javascript, performance, animation",
"url": null
} |
complexity-theory, np-complete, np, decision-problem
Title: Decide whether an $n$-bit positive integer is composite Question:
Given an $n$-bit positive integer. A decision problem is to decide whether it is composite. Is this problem in NP?
I know that for every composite number, a factor of the number is a certificat... | {
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"openwebmath_score": null,
"tags": "complexity-theory, np-complete, np, decision-problem",
"url": null
} |
# Cholesky Decomposition Var | {
"domain": "atleticolugo.it",
"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9875683480491555,
"lm_q1q2_score": 0.8074106704720572,
"lm_q2_score": 0.817574471748733,
"openwebmath_perplexity": 1222.609278182848,
"openwebmath_score": 0.5887592434883118,
"tags":... |
gazebo, rviz, rqt-gui, tum-ardrone, librviz
Originally posted by devesh on ROS Answers with karma: 104 on 2013-02-24
Post score: 2
Finally got something working using this link below.
http://ros.org/rosdoclite/groovy/api/rviz_python_tutorial/html/
To create an image panel, all I needed to do was write a config file(w... | {
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"id": 13043,
"lm_label": null,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "gazebo, rviz, rqt-gui, tum-ardrone, librviz",
"url": null
} |
Dividing rationalizing Higher Indices Et cetera above, we use the quotient Property of radical expressions again for easy.! A quotient instead of a product variables and exponents and personalized coaching to you... Order to move on Now we divide the denominator is a fourth root this second case, we used... Learn more,... | {
"domain": "drogist-voorschoten.nl",
"id": null,
"lm_label": "1. YES\n2. YES\n\n",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9669140244715405,
"lm_q1q2_score": 0.8078407512208123,
"lm_q2_score": 0.8354835391516133,
"openwebmath_perplexity": 1695.9749136677497,
"openwebmath_score": 0.74274462461471... |
navigation
<group ns="robot_0">
<param name="tf_prefix" value="robot_0" />
<node pkg="move_base" type="move_base" respawn="false" name="move_base_node" output="screen">
<remap from="map" to="/map" />
<param name="controller_frequency" value="10.0" />
<rosparam file="$(find ... | {
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"id": 5670,
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"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
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"openwebmath_score": null,
"tags": "navigation",
"url": null
} |
formula is the amount of space occupied by the pentagon pentagon the. Polygon formula polygon is the region occupied by the formula for area using the apothem hexagons. Polygon with 9 sides and angles one more adjacent side at a time it known. Formulas are also available the length of one of its sides, we use. Surface ... | {
"domain": "hotexl.com",
"id": null,
"lm_label": "1. YES\n2. YES\n\n",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9884918509356967,
"lm_q1q2_score": 0.812727261909032,
"lm_q2_score": 0.8221891370573388,
"openwebmath_perplexity": 445.53768278060596,
"openwebmath_score": 0.7381290793418884,
"tags":... |
statistical-mechanics, solid-state-physics, fermions
that for low excitations it is true that the width vanishes faster than the energy, therefore justifying the free electron gas. The weight $Z_k<1$ will tell you how much of the system behaves in this way. | {
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"openwebmath_score": null,
"tags": "statistical-mechanics, solid-state-physics, fermions",
"url": null
} |
c++, beginner, linked-list, homework, iterator
List.h
#pragma once
#include "Iterator.h"
namespace Util
{
template<typename T>
class List
{
public:
typedef Iterator<T> Iterator;
typedef Node<T> Node;
List();
~List();
List(const List&) = delete;
List(Li... | {
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"id": 34013,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "c++, beginner, linked-list, homework, iterator",
"url": null
} |
python, python-2.x, numpy, hash-map
'''
d = dict()
for element in itertools.product(*[markers for i in xrange(n)]):
d[element] = np.random.uniform(0, 1,n)
for i in xrange(n):
if element[i] !=0:
d[element][i]= np.nan
return d
rep_num = 3
marker = [0,1,2]
d = cre... | {
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "python, python-2.x, numpy, hash-map",
"url": null
} |
php, mysql, mysqli
if (empty($this->statement_object) or !is_a($this->statement_object, '\MySQLi_STMT'))
{
throw new \RuntimeException("StatementWrapper error, fails to prepare the statement. Error number: '{$mysqli->errno}', Error message: '{$mysqli->error}', Processed statement: '{$this->statemen... | {
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"id": 367,
"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, mysql, mysqli",
"url": null
} |
java, numerical-methods
public class MonteCarloPiComputer {
/**
* The random number generator.
*/
private final Random random;
public MonteCarloPiComputer(Random random) {
this.random = Objects.requireNonNull(
random,
"The input random number generator is null."
... | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "java, numerical-methods",
"url": null
} |
php, tdd, phpunit
function __construct()
{
parent::setName('Pizza Greek');
parent::setDescription('A Greek-style pizza with feta cheese, onion, olive and tomato');
}
}
Pizza/Pepperoni.php
<?php namespace Pattern\SimpleFactory\Pizza;
use Pattern\SimpleFactory\Pizza;
/**
* @package Pattern\SimpleFactory... | {
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"tags": "php, tdd, phpunit",
"url": null
} |
downloading:) We hope you find our resources useful. Comparing Fractions: 6. Dans les trois cas, la fraction représentée est équivalente . A. A fraction whose numerator is less than its denominator is called a proper fraction. Worksheets: Equivalent fractions. If the students understood the concept that whole numbers a... | {
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"id": null,
"lm_label": "1. Yes\n2. Yes",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9852713896101315,
"lm_q1q2_score": 0.8231780296343104,
"lm_q2_score": 0.8354835411997897,
"openwebmath_perplexity": 994.0381489318901,
"openwebmath_score": 0.7947641611099243,
"... |
special-relativity, visible-light
Title: What would a length contracted object look like? I have multiple sub-questions but they are related.
What would the object look like if in were passing by?
What would a star look like if we were traveling near $c$? Would the perspective be a a large blue-shifted disk?? When... | {
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"id": 4791,
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"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "special-relativity, visible-light",
"url": null
} |
np-complete, reductions, satisfiability, constraint-satisfaction
Let $z$ be a new variable not in $\phi$. Let there be $m$ clauses in $\phi$. We add $(z \lor \lnot z)$ and $2m+2$ copies of $(z)$ to $\phi$. In every exactly 1/3-satisfying assignment $z$ must be false.
Let $\phi \land (z \lor \lnot z) \land (z) \land (z... | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "np-complete, reductions, satisfiability, constraint-satisfaction",
"url": null
} |
formal-methods
If (any house is green) then (there exists a horse that is white).
An equivalent statement would be
If some house is green, then some horse is white.
The condition is "there exists a house which is green", and the consequence is "there exists a horse which is white".
If we wanted a different quantifi... | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "formal-methods",
"url": null
} |
ros
void handelerOdometry(const control_msgs::JointControllerStateConstPtr& msg1, const control_msgs::JointControllerStateConstPtr& msg2)
{
// based on: http://rossum.sourceforge.net/papers/DiffSteer/
double wheel_track = .21; //distance between two wheels in meters : in urdf dist is .3 in sdf it is .16 whee... | {
"domain": "robotics.stackexchange",
"id": 15782,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "ros",
"url": null
} |
time-complexity, data-structures, arrays, avl-trees
I would appreciate your help / hints to solve this hard question! Thank you! Maintain an AVL tree $T$ containing the indices of the unoccupied rooms. For each vertex $v$ of the tree additionally maintain the number $\eta(v)$ of vertices in the subtree of $T$ rooted a... | {
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "time-complexity, data-structures, arrays, avl-trees",
"url": null
} |
physiology, muscles
Title: How does the muscle return to its resting state after muscle contraction? I know that when ADP binds to the myosin head, it moves along and as it does so, it releases the ADP. The ATP attaches to the myosin head and releases the myosin head from the actin filament. Then the enzyme ATPase hyd... | {
"domain": "biology.stackexchange",
"id": 5571,
"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": "physiology, muscles",
"url": null
} |
electricity, electrostatics, semiconductor-physics
It is only possible for the donor and acceptor atoms to de-ionise in the depletion region if they capture a free carrier (electron and hole, respectively). But there are no free carriers in the depletion region because they have all be swept out by the strong electric... | {
"domain": "physics.stackexchange",
"id": 6650,
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"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "electricity, electrostatics, semiconductor-physics",
"url": null
} |
java, beginner, swing, pokemon
This... isn't quite preferred. Normal convention dictates something like this, again for clarity:
case <n>:
...
break;
default:
break;
Use a better class name
TypeChecker can imply lots of types checking. You can easily rename it as PokemonTypeChecker. :)
Consider a CustomRe... | {
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "java, beginner, swing, pokemon",
"url": null
} |
organic-chemistry, reaction-mechanism, synthesis
Reduction with hydrogen gas and Lindlar's catalyst. This transforms the alkyne into a cis alkene.
Epoxide formation with m-CPBA.
Ring opening with sodium methylamide. This is a base, and it should attack the less sterically hindered side of the epoxide - the side wit... | {
"domain": "chemistry.stackexchange",
"id": 1760,
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "organic-chemistry, reaction-mechanism, synthesis",
"url": null
} |
complexity-theory, logic, propositional-logic
Title: Complexity of a Set of Formulas Notation: We write $|\alpha|$ to denote the length in characters of an expression $\alpha$ in propositional logic.
Consider an expression $\alpha_n$ in disjunctive normal form built from $2n$ variables where each conjunct contains $n$... | {
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"id": 21412,
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "complexity-theory, logic, propositional-logic",
"url": null
} |
python, beginner, python-2.x, pathfinding
modelFld = r'C:\model'
baseInputFld = [os.path.join(modelFld, x) for x in os.listdir(modelFld) if 'base' in x.lower()][0]
oilWellFld = [os.path.join(baseInputFld, x) for x in os.listdir(baseInputFld) if 'oilwell' in x.lower()][0]
diswaterWellFld = [os.path.join(baseInputFld,... | {
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "python, beginner, python-2.x, pathfinding",
"url": null
} |
gazebo, moveit, ros-kinetic, husky
Altered position: | {
"domain": "robotics.stackexchange",
"id": 30562,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
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"tags": "gazebo, moveit, ros-kinetic, husky",
"url": null
} |
ds.algorithms, graph-theory, planar-graphs, approximation
The author then argues that the obtained subgraphs (consisting each of at most $k-1$ levels of the BFS tree), have bounded diameter (i.e. depending only on $k$).
This is the part I do not understand. For instance, what happens if some layer of the tree is a lo... | {
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"openwebmath_score": null,
"tags": "ds.algorithms, graph-theory, planar-graphs, approximation",
"url": null
} |
f#
open Traffic
open System
module Program =
[<EntryPoint>]
let main argv =
let distance = 150
printf "0) time: %d\n" (int (time distance 30 [10; 10; 10]))
printf "1) time: %d\n" (int (time distance 20 [10; 10; 10]))
printf "2) time: %d\n" (int (time distance ... | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "f#",
"url": null
} |
thermodynamics, physical-chemistry
As each substance condenses out of air it can be physically separated from the remaining gas, reducing the complexity of the mixture. Each substance, if returned to the gaseous state separate from the original mixture is physically and chemically distinct from the original mixture (o... | {
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"tags": "thermodynamics, physical-chemistry",
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c#, .net
return stringValue == objectValue as string;
}
if (objectValue is double)
{
return double.Parse(stringValue, CultureInfo.InvariantCulture) == objectValue as double?;
}
throw new ArgumentException("The object must either be a string or a double");
}
Note that you can also use a direct cast i... | {
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two parts, the first fundamental theorem of calculus and the second fundamental theorem of calculus. The values to be substituted are written at the top and bottom of the integral sign. See why this is so. Everyday financial … It is the theorem that shows the relationship between the derivative and the integral and bet... | {
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"... |
machine-learning, datasets, math, regression, function-approximation
Now, I thought about this problem and concluded that, if there is a possibility for this, then it will likely happen in regression because maybe the target outputs are in the same range and the same features values can correspond to the same output v... | {
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"tags": "machine-learning, datasets, math, regression, function-approximation",
"url": null
} |
type-theory, homotopy-type-theory
What this means is that, as others already pointed out, the "functional property" is there by construction. It may help to say the following: in type theory we do not think of mathematical objects as existing independently and beforehand. Instead, type theory is a theory of how object... | {
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Yeah, it's called the reverse of the distributive property of multiplication over addition/subtraction. (factoring out)
$$30=5\cdot 3\cdot 2$$
This, together with factoring out, show that adding or subtracting any multiple of 2,3 or 5 will be divisible by 2, 3 or 5, respectively. Since all numbers in 2,3,4,5, and 6 a... | {
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"tag... |
electricity, electric-current, voltage, electronics, electrical-engineering
There are other benefits to using AC over DC as well (and also downsides). With AC you have way less problems with arcing on switches because. If arcing starts with AC it will often stop the next zero crossing of the AC. With DC, the arc won't... | {
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"tags": "electricity, electric-current, voltage, electronics, electrical-engineering",
"u... |
probabilities of all possible outcomes is 1) Probability Rule […]. Probability is the chance or likelihood that an event will happen. This calculator aims to help you realize the extent to which the ID length can be reduced. | {
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"openwebmath_score": 0.753... |
heisenberg-uncertainty-principle, determinism
My question's center theme is, hypothetically with the HUP gone, what will we then observe in the quantum system under observation? Will this then rendered and become classical?
I personally believe that it is a matter of scale and for a hypothetical observer as small as t... | {
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"tags": "heisenberg-uncertainty-principle, determinism",
"url": null
} |
lagrangian-formalism, symmetry, field-theory, noethers-theorem, classical-field-theory
$$ \int_{\Omega} {L(\alpha,\partial_{\nu}\alpha,x^\mu)+\frac {\partial} {\partial x^\sigma} [L(\phi,\partial_{\nu}\phi,x^\mu) \delta x^\sigma]-L(\phi,\partial_{\nu}\phi,x^\mu) d^{4}x}$$
I tried showing this transition is true by ass... | {
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stoichiometry, concentration
After that the given solution is diluted up to $\pu{250 mL}$, so we have to use dilution formula
$$\begin{multline}
\text{initial concentration}\times \text{initial volume of solution} =\\
\text{final concentration}\times \text{final volume of solution}.
\end{multline}$$
So we suppose... | {
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} |
speed-of-light, velocity, redshift
But, in general, if you do not have those effects then you will need the above equation rather than either of these specializations. Note that $\hat r$ still points, in the coordinates where the observer is stationary, from the observer to the point where the light was emitted. If yo... | {
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"tags": "speed-of-light, velocity, redshift",
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} |
microcontroller
When the total cost of a custom board is less than the cost of continuing to use a development board, or
When you need a particular footprint for your board that cannot be met by using a stock development board.
For point 1, this would generally be if you're going to produce some quantity of product.... | {
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"tags": "microcontroller",
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c++, boost
Full Demo, 103 Lines Of Code
Only just didn't manage to bring it under 100 LoC, but I added more test cases in the process.
Live Demo On Wandbox
Live Demo On Compiler Explorer
Live Demo On Coliru (where I found out that phoenix::construct<> for aggregates requires either GCC or recent boost or both, so a... | {
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is to fit curve... West 18th Avenue, Columbus oh, yeah, and integrate the separate functions separately see the line field the... Variable < condition and change it right on the independent time variable < 4 } { x },. > reflects the fact that the slope of the given rectangle that satisfies initial... A particular solut... | {
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"openwebmath_score": 0.7913081049919128,
"tags":... |
machine-learning, scikit-learn, random-forest, decision-trees
But result from this operation differs a lot from value obtained by predict() method.
I would be grateful if someone could explain how this regressor works. And the second question is, is there any other way to obtain predicted value based only on decision ... | {
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"url": null
... |
performance, c, strings, design-patterns, parsing
Minor: Suggest replacing void* with some large unsigned integer like uintmax_t as the generic return type for the various functions void* (*fn)(void). Or better yet, a union of the various types.
typedef union {
time_t t;
void *p ;
int i;
} Return_T; | {
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"tags": "performance, c, strings, design-patterns, parsing",
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} |
nuclear-physics, atomic-physics, radiation, radioactivity
Title: Notation on chart of the isotopes I recently purchased a complete chart of the isotopes,
(this one: https://shop.marktdienste.de/shoppages/produktuebersicht.aspx )
and have it on the wall next to me in work. The different coloured squares indicate what... | {
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"tags": "nuclear-physics, atomic-physics, radiation, radioactivity",
"url": null
} |
python, python-3.x, parsing
def convert(self, tokens: set[str], tablename: str, columnname: str) -> None:
for token in tokens:
query = 'INSERT INTO {0} ({1}) VALUES ("{2}");'.format(tablename, columnname, token)
self.queries.add(query)
Now, this can also be refactored in the same way. ... | {
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"url": null
} |
c++, c++11, parsing, csv
Just remove that function altogether. If you need the size of the struct, use sizeof(Student).
Student::Student(std::string studentInformation)
{
stringstream studentStream(studentInformation); // a stream of student information
studentStream >> firstName;
studentStream >> lastName... | {
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"tags": "c++, c++11, parsing, csv",
"url": null
} |
deep-learning, neural-network, weight-initialization
Title: Where Does the Normal Glorot Initialization Come from? The famous Glorot initialization is described first in the paper Understanding the difficulty of training deep feedforward neural networks. In this paper, they derive the following uniform initialization,... | {
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"url": null
} |
c++, game
map[map_index] = wide[data_index];
}
}
return 0;
}
int Map::getMapAroundPlayer(int x, int y, int center_x, int center_y, BUFFER& buffer)
{
//The current position of the player on the screen is (center_x, center_y)
//The current position of the player on the map is (x, y)
int
... | {
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molecular-structure, vsepr-theory
(mouse over for answer)
Yes, the two bonds will be in a plane 180 degrees from one another, just like the $\ce{H-C-C}$ bond angle in acetylene.
Take home message:
$\ce{sp^3}$ hybridized carbon has angles ~109 degrees
$\ce{sp^2}$ ~ 120 degrees
and $\ce{sp}$ ~180 degrees. | {
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r... Sweet and get straight to it '40s have a string 'contains ' substring method '30s and '40s a! Or C++, Python modulo with negative numbers positive, although the may! From Guido van Rossum: http: //python-history.blogspot.com/2010/08/why-pythons-integer-division-floors.html no surprise division operator // or the f... | {
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"lm_q1_score": 0.9653811611608242,
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"lm_q2_score": 0.9161096221783882,
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"openwebmath_score": 0.5023279190063477,
"t... |
$0.3^3 + 0.3^3 0.7 + 0.3^3 0.7^2+0.3^4 0.7 = 0.0648$
Actual answer (at the back of the book) = $0.05913$
My question is what I am doing wrong here (or is the book wrong?)
Also, I would really appreciate if someone could tell me a general way to solve the problems of this type where probability of $k$ consecutive suc... | {
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"lm_q1q2_score": 0.854879987898411,
"lm_q2_score": 0.8723473829749844,
"openwebmath_perplexity": 137.38488907838854,
"openwebmath_score": 0.6149606704711914,
"tag... |
general-relativity, cosmology, differential-geometry, topology
I can hear the people saying "We can always examine what the curvature is - $S^n$ has non-vanishing one, $\mathbb{R}^n$ has vanishing one.". That's alright, but the above gauge argument forces us the either accept that there is no globally well-defined gau... | {
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"tags": "general-relativity, cosmology, differential-geometry, topology",
"url": null
} |
general-relativity, gravity, visible-light, mass-energy, quantum-gravity
in the upside relation as we except because it would be more delayed the much you get a way from gravity In classical general relativity any object with a four vector , i.e. has energy and momentum, contributes to the curvature of space time that... | {
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"tags": "general-relativity, gravity, visible-light, mass-energy, quantum-gravity",
"url"... |
python, python-3.x, file-system
could be written as:
path = Path.cwd().joinpath(file)
if path.is_file():
with path.open() as f:
or since you're starting at the current directory, simply:
path = Path(file)
if path.is_file():
with path.open() as f: | {
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"tags": "python, python-3.x, file-system",
"url": null
} |
optics, fourier-transform
Title: Fourier optics (diffraction from pinholes)
A plane wave of wavelength $\lambda$ and unit amplitude is normally incident on a mask placed in the xy-plane at $z=0$. The mask contains two infinitesimally small pinholes, located on the x-axis ($y=0$) at $x=-d/2$ and $x=d/2.$ Transmitted l... | {
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"openwebmath_score": null,
"tags": "optics, fourier-transform",
"url": null
} |
ros, ompl, global-planner
Originally posted by Ken_in_JAPAN with karma: 894 on 2014-06-06
This answer was ACCEPTED on the original site
Post score: 0 | {
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"tags": "ros, ompl, global-planner",
"url": null
} |
newtonian-mechanics, spring
Since the spring compresses infinitely fast and the right block doesn't have to move it all happen instantly and everything is determined by the left block. | {
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java, sql, database
return progression;
}
public static List<Progression> selectAll() {
QueryRunner qr;
List<Progression> progressions;
try {
qr = new QueryRunner(SLDbHelper.getInstance().getDataSource());
progressions = qr.query(SQL_SELECT_ALL, new IgnoreUnder... | {
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by a dragging force proportional to the deflection leading to a typical equation of motion in the form of ) (3 with a solution in the form of ). Instead of looking at a linear oscillator, we will study an angular oscillator - the motion of a pendulum. 1 Over-damped oscillator: For instance if the oscillator is given an... | {
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... |
algorithms, data-structures, dynamic-programming
Now, I am stuck here. How can calculate this and what about larger values of N such as 50?
I tried using vectors and pushing back every element and do the reverse operators and swap elements but I am not sure whether this is correct or not. Consider the variant of the p... | {
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machine-learning
Title: Predicting Sequence based on Tabular Features I have a dataset regarding a specific junction on a piece of road and the cars that will cross that junction. I am trying to predict the order that cars will pass the specific junction given a set of tabular features. My dataset looks similar to the... | {
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We use the change of variables $y=x^2$. $$\int_0^\infty e^{-x^2} \; dx = \frac{1}{2}\int_{0}^{\infty} y^{-1/2} {\rm e}^{-y} \,dy = \frac{1}{2} \Gamma(\frac{1}{2}) \,,$$
where $\Gamma(x)$ is defined by the integral, $$\Gamma( x ) = \int_{0}^{\infty} y^{x-1} {\rm e}^{-y} \,dy \,.$$
Series Method
If you are interested ... | {
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"tags": n... |
neural-network, nlp, feature-engineering, word-embeddings
Title: How to incorporate keyboard positions on character level embeddings? I am working with NLP and have character level embeddings.
I have embeddings learned from Wikipedia text.
Now, I want to learn embeddings from chat data (where misspellings and abbrevia... | {
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "neural-network, nlp, feature-engineering, word-embeddings",
"url": null
} |
formal-languages, computability, regular-languages, finite-automata
To summarize in English, the length sets of regular languages are the sets of integers that are periodic¹ above a certain value.
¹
To hang on to a well-established notion, periodic means the characteristic function of the set (which is a function $\m... | {
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"tags": "formal-languages, computability, regular-languages, finite-automata",
"url": null
} |
c#, xaml
Title: Need help optimizing code so that resizing of 884+ columns in grid does not lag private void rect_ManipulationStarting(object sender, ManipulationDeltaRoutedEventArgs e)
{
startingColumn = Grid.GetColumn(e.OriginalSource as Windows.UI.Xaml.Shapes.Rectangle);
gLValue = headerGrid.Co... | {
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"openwebmath_score": null,
"tags": "c#, xaml",
"url": null
} |
Distinct numbers in multiplication table
Consider the multiplication table for the numbers $$1,2,\dots, n$$. How many different numbers are there? That is, how many different numbers of the form $$ij$$ with $$1 \le i, j \le n$$ are there?
I'm interested in a formula or an algorithm to calculate this number in time le... | {
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"id": null,
"lm_label": "1. YES\n2. YES",
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"lm_q1_score": 0.971992481016635,
"lm_q1q2_score": 0.8013707996110047,
"lm_q2_score": 0.824461932846258,
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"openwebmath_score": 0.9035899043083191,
"tags"... |
continuous-signals, transform, laplace-transform
Title: How can we prove the correctness of the integration property of the Laplace transform? I was going through an Electrical Engineering textbook for understanding the Laplace transform and came across the following proof for one of the properties of the Unilateral L... | {
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"id": 9805,
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"tags": "continuous-signals, transform, laplace-transform",
"url": null
} |
We now need an elementary lemma that allows us to create a “collision” between two of the ${a_1,\dots,a_n}$ via a linear projection, without making any of the ${a_i}$ collide with the origin:
Lemma 5 Let ${a_1,\dots,a_n \in {\bf R}^d}$ be non-zero vectors that are not all collinear with the origin. Then, after replaci... | {
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"id": null,
"lm_label": "1. YES\n2. YES\n\n",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9875683509762453,
"lm_q1q2_score": 0.8074106838393037,
"lm_q2_score": 0.8175744828610095,
"openwebmath_perplexity": 289.3477014796908,
"openwebmath_score": 0.8615475296974182,
"tag... |
reinforcement-learning, comparison, policies, stationary-policy
Title: What is the difference between a stationary and a non-stationary policy? In reinforcement learning, there are deterministic and non-deterministic (or stochastic) policies, but there are also stationary and non-stationary policies.
What is the diff... | {
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"openwebmath_score": null,
"tags": "reinforcement-learning, comparison, policies, stationary-policy",
"url": null
} |
c++, linked-list, reinventing-the-wheel
Please put your code into a namespace. Do you think that SinglyLinkedList is a very unique name in the global scope?
You need to look into const correctness.
You need to look into move semantics.
Major Bug.
You have not implemented the rule of three (or five). When a class cont... | {
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"openwebmath_score": null,
"tags": "c++, linked-list, reinventing-the-wheel",
"url": null
} |
c#, reflection, rubberduck, com
foreach (var reference in references)
{
You'll notice that I prefer to keep SelectMany simple and add the call to Cast later. That's a personal preference thing but I find it easier to scan that way. Although that's still true, as you note in the comments, you can't do that here :)
Ge... | {
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"openwebmath_score": null,
"tags": "c#, reflection, rubberduck, com",
"url": null
} |
automata, finite-automata, proof-techniques, nondeterminism
But how do you check containment of languages, you might ask. Well, now observe that $A\subseteq B$ iff $A\cap \overline{B}=\emptyset$ (where $\overline{B}$ is the complement of $B$).
Let's consider first checking whether $L(N)\subseteq L(D)$. To do this, you... | {
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"openwebmath_score": null,
"tags": "automata, finite-automata, proof-techniques, nondeterminism",
"url": null
} |
ros-kinetic, transform
Comment by gvdhoorn on 2019-06-25:
Nowhere in my comment did I judge anyone for wanting more documentation or explanation. Nowhere in my comment did I excuse the lack of documentation by claiming that it is not needed.
You seem to have taken this personal.
I merely suggested a possible rationale... | {
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$T_\theta$ is self-adjoint. Also note that \begin{align*}& (T_\theta)^2e_1=T_\theta(\cos\theta e_1+\sin\theta e_2)\\ =&\cos\theta(\cos\theta e_1+\sin\theta e_2)+\sin\theta(\sin \theta e_1-\cos\theta e_2)\\=&(\cos^2\theta+\sin^2\theta)e_1=e_1,\end{align*} \begin{align*}& (T_\theta)^2e_2=T_\theta(\sin\theta e_1-\cos\thet... | {
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"lm_label": "1. YES\n2. YES",
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"lm_q1_score": 0.988491849579606,
"lm_q1q2_score": 0.8279805088035487,
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"openwebmath_perplexity": 148.50501647031686,
"openwebmath_score": 0.9993876814842224,
"ta... |
navigation, ros-kinetic, robot-localization
values:
-
key: "Events in window"
value: "0"
-
key: "Events since startup"
value: "0"
-
key: "Duration of window (s)"
value: "10.157473"
-
key: "Actual frequency (Hz)"
value: "0.0000... | {
"domain": "robotics.stackexchange",
"id": 32847,
"lm_label": null,
"lm_name": null,
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"openwebmath_score": null,
"tags": "navigation, ros-kinetic, robot-localization",
"url": null
} |
computer-architecture
First, we want the instructions to be fixed width (32-bits). This guarantees that instructions are cache-block and page aligned which simplifies cache and page presence and permission checks.
Second we want the various instruction fields (opcode/source regs/immediates) to be fixed width and fixe... | {
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"tags": "computer-architecture",
"url": null
} |
Sort by:
3) $a^3=abc=a+b+c\ge a+2\sqrt{bc}=3a\implies a^2\ge 3$
4) If $x$ odd, $y$ even, then $y=2\implies x(x+2)=120+z$$\implies x^2-2x-120=z$$\implies (x-12)(x+10)=z$$\implies x=13, z=23$
Else $x(x+y)$ is even so $z=2$ and $x(x+y)=122=2\times 61\implies x=2, y=59$
Only solutions are $(x,y,z)=(13, 2, 23), (2, 59, ... | {
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"lm_q1_score": 0.951142221377825,
"lm_q1q2_score": 0.806537935533083,
"lm_q2_score": 0.8479677564567912,
"openwebmath_perplexity": 2836.0727634438895,
"openwebmath_score": 0.991969883441925,
"tags"... |
astrophysics, terminology, quasars
"Blazars" are extremely bright point-sources in the radio, and more recently high energy (e.g. X-ray and gamma-ray).
The unified, now canonical, understanding of AGN is depicted below: | {
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"tags": "astrophysics, terminology, quasars",
"url": null
} |
machine-learning, python, feature-selection, random-forest, dimensionality-reduction
# One Hot Encoding the columns gathered in categorical_columns
# take one-hot encoding
OHE_sdf = pd.get_dummies(df[categorical_list])
# drop the old categorical column from original df
df.drop(columns=categorical_lis... | {
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"id": 5813,
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ros, installation
Original comments
Comment by RedoXyde on 2014-02-26:
That's interesting... I've done Hydro installation on Ubuntu 12.04 32b, and 13.04 64b without facing such problem... It looks like it comes from your network configuration, maybe a caching or filtering proxy, or from your GNU/Linux setup, maybe loc... | {
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} |
~ilikemath40
## Solution 2
First, note how the number must end in either $5$ or $0$ in order to satisfying being divisible by $15$. However, the number can't end in $0$ because it's not strictly greater than the previous digits. Thus, our number must end in $5$. We do casework on the number of digits. $\newline$
Cas... | {
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"lm_q1q2_score": 0.802176987637191,
"lm_q2_score": 0.8175744761936437,
"openwebmath_perplexity": 320.4250647283855,
"openwebmath_score": 0.816435694694519,
... |
c++, c++17
file1 << Person{"Martin", 12};
file2 << Employee{Person{"KK", 14}, 2.34};
}
Makefile
SRC = $(wildcard *.cpp)
OBJ = $(patsubst %.cpp, %.o, $(SRC))
CXXFLAGS▸ += -std=c++17 -Wall -Wextra -pedantic -Wno-unknown-pragmas $(EXTRA_INCLUDE_DIR)
all: $(OBJ)
$(CXX) $(CXXFLAGS) -o fi... | {
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"openwebmath_score": null,
"tags": "c++, c++17",
"url": null
} |
Now look at $D'_a$ and some other $D'(x)$ where $x$ is not $a$ or $b$. There are six cases. Two cases where $D'_a$ rolls either an old number or $m+3$. Three cases where $D_x$ rolls either an old value, $m+1$, or $m+4$. \begin{align} p'(a,x) & = \frac{k}{k+2}\left[\frac{k}{k+2}p(a,x)\right] + \frac2{k+2}\left[\frac{k}{... | {
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"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9861513869353992,
"lm_q1q2_score": 0.8085389590300468,
"lm_q2_score": 0.8198933447152497,
"openwebmath_perplexity": 378.5845929103986,
"openwebmath_score": 0.9812066555023193,
"tag... |
image-processing, reference-request, 3d
Title: I'm looking to do my senior capstone project in the field of medical tomography, what is a good book to get acquainted with the field? I'm a junior currently pursuing a mathematics degree with aspirations toward medical school. I have a senior project I have my entire las... | {
"domain": "dsp.stackexchange",
"id": 180,
"lm_label": null,
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"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "image-processing, reference-request, 3d",
"url": null
} |
homework-and-exercises, electromagnetism, energy-conservation
Title: How much power would it take to stop a bullet with a magnet? If a 7.5 gram copper-jacketed lead bullet (say, a 9x19mm Parabellum) was travelling at 360 m/s, how much power would it take to diamagnetically stop it in the space of one meter?
This quest... | {
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"openwebmath_score": null,
"tags": "homework-and-exercises, electromagnetism, energy-conservation",
"url": null
} |
finite-impulse-response, poles-zeros, zero-padding, group-delay
$$H(z) = z^{-2}+z^{-3}$$
$$=\frac{z+1}{z^3}$$
This will have 1 finite zero (at $z=-1$) and 3 finite poles (at the origin, $z=0$).
This should hopefully clarify what is needed for further study. | {
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"tags": "finite-impulse-response, poles-zeros, zero-padding, group-delay",
"url": null
} |
si-units, unit-conversion, units
$$
F={q_1q_2\over r^2},
$$
you can define a unit of charge to be (if I've done the algebra right) $(ML^3/T^2)^{1/2}$,
where $M,L,T$ are your units of mass, length, time.
Whether charge is defined in terms of mass, length, time, or whether it's an independent unit, is a matter of conven... | {
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"id": 1209,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "si-units, unit-conversion, units",
"url": null
} |
algorithms, computational-geometry
Title: Bucket computation, cutting array with lines Given an NxN array, drawing a line from the edge's midpoint to the opposite field how can the N buckets be found covering the majority of the line's path?
A visual aid:
Is there a better way to this than computing the linear equat... | {
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"tags": "algorithms, computational-geometry",
"url": null
} |
If editing were not so painfully slow at the moment, I'd have loved to elaborate further by plugging in complex values and ending up with the quaternions and the Pauli matrices but for the moment a simple wikipedia link will have to do. See in particular the passage on matrix representations of the quaternions.
• Geom... | {
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"lm_q1_score": 0.9783846703886662,
"lm_q1q2_score": 0.8315987703947288,
"lm_q2_score": 0.8499711775577736,
"openwebmath_perplexity": 166.91318382704276,
"openwebmath_score": 0.9147540330886841,
"ta... |
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