text stringlengths 1 1.11k | source dict |
|---|---|
window-functions, terminology, window
Note 1: This is borderline a programming question or code review, but I think still more for signal processing.
Note 2: Although sub-sampling causes signal artifacts such as aliasing. This is not part of the question. This is more likely a question of what the data reporting appl... | {
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"tags": "window-functions, terminology, window",
"url": null
} |
c
Title: Get Minimum of four and maximum up to a limit
Sita shortlists 4 gifts priced at r1, r2, r3 and r4
respectively. She wants to buy 3 of these gifts such that it doesn't
exceed her budget of x.
Input and Output Format:
Input consists of 5 integers that correspond
to r1, r2, r3, r4 and x. Output consists o... | {
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} |
genetics, molecular-biology, homework
Title: Restriction Mapping - Homework question I have trouble in solving this exercise.
Exercise
A circular plasmid of 10,000 base pairs (bp) is digested with two restriction enzymes,A and B, to produce a 3000 bp and a 2000 bp bands when visualised on an agarose gel. when digeste... | {
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"tags": "genetics, molecular-biology, homework",
"url": null
} |
Correct.
Guest wrote:Second Question:
If I take only one coin from the magic bag, what is the chance/probability to receive either an iron, bronze, silver or gold coin?
(Receiving any of these four coins would be a success, and receiving any of the other 96 coins would be a failure).
I have tried to do some calculati... | {
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"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9796676502191265,
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"lm_q2_score": 0.8397339676722393,
"openwebmath_perplexity": 1426.4851896355524,
"openwebmath_score": 0.5859814882278442,
"tags": nu... |
r
Title: How is the min_rank used with the flights database I'm exploring the https://r4ds.had.co.nz/transform.html#add-new-variables-with-mutate r for data science handbook and don't really understand the min_rank() operator. Doing the exercises it asks to Find the 10 most delayed flights using a ranking function. H... | {
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"openwebmath_score": null,
"tags": "r",
"url": null
} |
homework-and-exercises, newtonian-mechanics
If you want further confirmation, you can do this problem a different way: imagine we just start with the car at the top of the loop, $(x, y) = (0, r)$, firing it with a speed $v$ in the $-x$ direction. We know such an object in free-fall describes a parabola $x(t) = x_0 - v... | {
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"tags": "homework-and-exercises, newtonian-mechanics",
"url": null
} |
javascript, beginner, node.js, web-scraping
module.exports={
extractor: extractor
}
get-table.js
I do wonder if returning "error" in case of failure is the most useful behaviour. Would it not be more convenient to just... let the failure remain a failure, to make it easier for the caller to detect and clean up? S... | {
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"tags": "javascript, beginner, node.js, web-scraping",
"url": null
} |
python, flask, crud
def stat(username):
try:
c, conn = connection()
c.execute("SELECT * FROM userstat WHERE username=%s", (username,))
dict = {}
u = c.fetchone()
dict['username'] = username
dict['words'] = str(u[1]).split()
dict['score'] = u[2]
return... | {
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"lm_q2_score": null,
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"openwebmath_score": null,
"tags": "python, flask, crud",
"url": null
} |
java, android
Crouton.cancelAllCroutons();
loginAgain.removeCallbacks(null);
han.removeCallbacks(null);
}
@Override
protected void onStart() {
super.onStart();
// Do not go to splash screen if came from signup activity
if (isMinimized && Prefs.getBoolean(getString(... | {
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"tags": "java, android",
"url": null
} |
complexity-theory, circuits, lower-bounds, polynomials
Is this true for a polynomial with degree $n^{0.5+\epsilon}$ for some small constant $\epsilon>0$ ? How about a polynomial with degree $o(n)$? You can show a polynomial of degree $O(\sqrt{n\log n})$ can agree with parity on all but $o(1)$ fraction of the inputs. (... | {
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"tags": "complexity-theory, circuits, lower-bounds, polynomials",
"url": null
} |
quantum-field-theory, mathematical-physics, dirac-equation
For instance, a possible basis choice in 2D is, $\gamma^0=\sigma^1, \gamma^1=\sigma^2$. Then there is the simple solution with no $x^1$ dependence,
$$(\psi_L,\psi_R)=(e^{i m x^0},e^{i m x^0}).$$
Why are these ordinary solutions not considered when zero modes ... | {
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"tags": "quantum-field-theory, mathematical-physics, dirac-equation",
"url": null
} |
php, mvc
View::render('Header', $headerData);
if ($this->requestHandler->getMethod() === 'POST') {
$v = new Validator();
$v->addRule(1, ['required', 'max' => 35]);
$v->addRule(2, ['required', 'between' => [5, 255], 'email']);
$v->addRule(3, ['required', 'min' =... | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "php, mvc",
"url": null
} |
lg.learning
Then Blum et al. ('00) separated noisy PAC from SQ by showing that parities on the first $(\log(n) \log\log(n))$ are polynomial-time learnable in the noisy PAC model but not in the SQ model.
My question is this: | {
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} |
organic-chemistry, bond, reactivity, polarity, halogenation
Why does the strength of R-X bond affect the reactivity of halogenoalkane?
This is because, the slow step (i.e. rate determining step) of the Sn1 and Sn2 nucleophilic substitution mechanism involves the breaking of the R-X bond. Either to form a carbocation (... | {
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"tags": "organic-chemistry, bond, reactivity, polarity, halogenation",
"url": null
} |
statistical-mechanics, field-theory, mathematical-physics, ising-model
$$
\sum_x e^{i(p\pm p')x} = 2\pi\delta(p \pm p'),\quad \sum_{n=1}^\infty e^{\pm ipn} = \frac{e^{\pm ip}}{1- e^{\pm ip}}, \tag{E}
$$
$$
\sum_{x>x'} \xi_x \xi_{x'} = \sum_x\sum_{n=1}^\infty \xi_x \xi_{x-n},\quad
\sum_{x<x'} \xi_x \xi_{x'} = \sum_x\s... | {
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"tags": "statistical-mechanics, field-theory, mathematical-physics, ising-model",
"url": ... |
solid-state-physics, photoelectric-effect
Thankfully, Ashcroft and Mermin's classic book has a long discussion on the work function in chapter 18.
Their formula is $W=-\epsilon_F+W_s$, where $\epsilon_F$ is the Fermi energy, a quantity determined by the density of electrons and the properties of the crystal lattice of... | {
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"tags": "solid-state-physics, photoelectric-effect",
"url": null
} |
homework-and-exercises, electrostatics, electric-fields, symmetry, gauss-law
Title: Can you elaborate the concept of symmetry and how do you conclude that the field is $0$ along $x$-$z$ plane? This is a fairly popular problem.
An infinite slab, of thickness 2d, carries a volume charge density $\rho$.Find the electric... | {
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"... |
c#
/// <summary>
/// Current status of the object. Various operational and nonoperational statuses can be defined.
/// Operational statuses include: "OK", "Degraded", and "Pred Fail" (an element, such as a SMART-enabled
/// hard disk drive, may be functioning properly but predicting a failure in the near ... | {
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"tags": "c#",
"url": null
} |
javascript, jquery, html5, ajax, event-handling
function init() {
desktopInput.addEventListener('keyup', handleEmptyInputDesktop);
}
init();
})();
Without the setTimeout(), the dropdown menu will disappear if the key isn't pressed long enough on the first stroke that deletes all the text.
I've omitted some e... | {
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"openwebmath_score": null,
"tags": "javascript, jquery, html5, ajax, event-handling",
"url": null
} |
lagrangian-formalism, gauge-theory, dimensional-analysis, brst, ghosts
Title: Mass dimension of ghost Lagrangian in BRST quantization It seems from the BRST transformation rules that the ghost fields should be dimensionless:
For eg. in the Abelian case in 4D:
$$A_{\mu} \to A_{\mu} + d_{\mu}c.$$
Then the ghost Lagrangi... | {
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"tags": "lagrangian-formalism, gauge-theory, dimensional-analysis, brst, ghosts",
"url": ... |
electromagnetism, symmetry
Btw a final remark on this example, particularly in case 2: here, the time-reversal $L(t,x)=(-t,R(x))$ is a Lorentz transformation (which is an isometry of Minkowski space)… but very crucial here is that the Minkowski metric is a quadratic form, so the minus sign gets cancelled out. At the l... | {
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"openwebmath_score": null,
"tags": "electromagnetism, symmetry",
"url": null
} |
ros
* /move_base/TrajectoryPlannerROS/yaw_goal_tolerance
* /move_base/clearing_rotation_allowed
* /move_base/controller_frequency
* /move_base/global_costmap/global_frame
* /move_base/global_costmap/inflation_radius
* /move_base/global_costmap/map_type
* /move_base/global_costmap/max_obstacle_height
* /move_bas... | {
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"id": 23666,
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"lm_q2_score": null,
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"openwebmath_score": null,
"tags": "ros",
"url": null
} |
materials, identification
Title: What material is used in coating these aluminum containers for the food industry? What is the material used to coat (some might use the term 'lacquer') disposable aluminum containers in the food industry? And can it be removed in a safe way (for the environment) with 'home methods'?
I ... | {
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"openwebmath_score": null,
"tags": "materials, identification",
"url": null
} |
ros2
I can run correctly: ros2 run pkg_name exe_name --ros-args -p "calib:=yes", while having the inverse exception with "calib:=ok" .
Originally posted by alberto with karma: 100 on 2022-08-09
This answer was ACCEPTED on the original site
Post score: 1 | {
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"tags": "ros2",
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# How to prove that the sum of squared binomials equals $\binom{2n}{n}$ [duplicate]
I've stumbled upon this lemma a few times in my textbook: $$\sum_{k=0}^{n}\begin{pmatrix}n\\k\end{pmatrix}^2=\begin{pmatrix}2n\\n\end{pmatrix}$$ I've been trying to prove it, but I simply can't seem to see a connection. I've been tryin... | {
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"lm_q1_score": 0.9884918509356966,
"lm_q1q2_score": 0.834183439681433,
"lm_q2_score": 0.8438951104066293,
"openwebmath_perplexity": 223.20243795244704,
"openwebmath_score": 0.8502383828163147,
"tag... |
virology, population-genetics, population-biology
What are such well-documented viruses?
How much do we know about them?
How do we know this?
How much have they changed ? ( In terms of their danger to humans, e.g.)
Disclosure: the question is motivated by this one. Here is a somewhat similar question (but rather limi... | {
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"id": 11584,
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"lm_q2_score": null,
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"tags": "virology, population-genetics, population-biology",
"url": null
} |
electromagnetism, electrostatics, potential, boundary-conditions
and thus the uniqueness theorem has indeed worked out.
Recall that the uniqueness theorem says that if you give the values of the potential on a boundary of some space $V$ then the potential inside that space $V$ is uniquely specified, if the equation $\... | {
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"openwebmath_score": null,
"tags": "electromagnetism, electrostatics, potential, boundary-conditions",
"url": null
} |
java, algorithm, graph
@Override
public String toString() {
return "SimpleAdjacencyList{" +
"adjacencyList=" + adjacencyList +
'}';
}
public Map<Integer, List<Vertex>> getAdjacencyList() {
return adjacencyList;
}
// TODO: remove this
public stat... | {
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"openwebmath_score": null,
"tags": "java, algorithm, graph",
"url": null
} |
# Given a general solution, find its differential equation.
So usually, a differential equation question is asking to find a general solution. But this is the other way around.
I have a general solution $$y=\frac{1}{c_1 \cos x+c_2 \sin x},$$ and I want to find the differential equation to it. This, I think, is about ... | {
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"tags... |
Hmm, then I don't have much of an idea at the moment. This is really more of a new question, which people more familiar with Stokes problems are better equipped to answer. Why don't you ask a new question (use the link below), where you describe exactly which problem you are solving (right hand side, boundary condition... | {
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"lm_q1_score": 0.9863631675246404,
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"lm_q2_score": 0.815232489352,
"openwebmath_perplexity": 311.5623995754753,
"openwebmath_score": 0.9049465656280518,
"tags": ... |
Let $r_2(n)$ denote the number of pairs of integers $(x, y)$ such that $x^2 + y^2 = n$. Then $N(r) = 1 + r_2(1) + ... + r_2(r^2)$ (if $r$ is an integer). On the other hand, a classic result of number theory implies that
$$r_2(n) = 4(d_1(n) - d_3(n))$$
where $d_k(n)$ is the number of divisors of $n$ congruent to $k \b... | {
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"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9664104982195785,
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"lm_q2_score": 0.8333245911726382,
"openwebmath_perplexity": 496.75176320836357,
"openwebmath_score": 0.9985755085945129,
"ta... |
# Mathematics
The value of a certain fraction becomes 1/5 if one is added to its numerator. If one is taken from its denominator, its value becomes 1/7. Find the fraction by setting up a pair of simultaneous equations and solving them
1. 👍 0
2. 👎 0
3. 👁 171
1. (n+1)/d = 1/5
n/(d-1) = 1/7
5(n+1) = d
7n = d-1
5n -... | {
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"lm_q2_score": 0.8705972717658209,
"openwebmath_perplexity": 963.7793918513066,
"openwebmath_score": 0.9253820776939392,
"tags":... |
which, when ex-n. Sum and Difference Formulas Introduction: In this lesson, formulas involving the sum and difference of two angles will be defined and applied to the fundamental trig functions. This formula is a bridge between the Fourier transform and the Fourier series. Note: The value of a trigonometric function is... | {
"domain": "quellidelparco.it",
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"lm_q1_score": 0.9814534316905263,
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"lm_q2_score": 0.8376199552262967,
"openwebmath_perplexity": 566.7485815866885,
"openwebmath_score": 0.874673068523407,
"... |
cc.complexity-theory, lo.logic, sat, boolean-functions
However, I am not sure what the complexity of checking equivalence in this case would be. I could say that the two propositions are equivalent iff ($P_1 \wedge \neg P_2$) and ($P_2 \wedge \neg P_1$) are both unsatisfiable, but I can't use the linear time SAT algo... | {
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"tags": "cc.complexity-theory, lo.logic, sat, boolean-functions",
"url": null
} |
# Simple Region plot with “or” condition (||) does not connect the or parts “smoothly”?
Suppose I want to look at the region defined by the conditions
\begin{align}x\leq y && x<2\\\text{OR}\quad x\geq y&& x\geq2 \end{align}
I plot this using the command
RegionPlot[x <= y && x < 2 || x >= y && x >= 2, {x, 0, 5}, {y... | {
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"openwebmath_score": 0.32351377606391907,
"t... |
inorganic-chemistry, synthesis, reactivity, solid-state-chemistry
The stability of the cobalt complexes is related to its electronic structure. The cobalt atom is argon + 9 electrons. $\ce{Co^3+}$ is argon + 6 electrons. 12 electrons are missing in $\ce{Co^3+}$ and needed to build up the electronic configuration of th... | {
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"tags": "inorganic-chemistry, synthesis, reactivity, solid-state-chemistry",
"url": nul... |
java, multithreading, socket, server
} catch (IOException e) {
System.out.println(e.toString());
}
}
public void run(){
mainThread.start();
}
private void handleIncomingConnections(){
while(isRunning){
try {
final Socket c... | {
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"tags": "java, multithreading, socket, server",
"url": null
} |
video about getting data from MyMathLab into StatCrunch and then a..., exists between two variables and is denoted by the letter ' r ' regression - statistical linear correlation coefficient analysis analyzing. Shows the coefficients of the linear correlation coefficient for your data to a new spreadsheet the... Less t... | {
"domain": "ceewl.ca",
"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9879462226131666,
"lm_q1q2_score": 0.8030691871859112,
"lm_q2_score": 0.8128673087708698,
"openwebmath_perplexity": 584.1952170989096,
"openwebmath_score": 0.6945340037345886,
"tags": null,... |
# Do we have to expand the brackets before applying De Morgan's Laws?
If we have the example:
$$\overline{(A + B + C)D}$$
Then can we apply De Morgan's Law as is, or do we first need to expand out the brackets?
If I expand the terms first, I get:
$$original: \overline{(A + B + C)D}$$ $$expanded: \overline{AD + BD ... | {
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"lm_q1q2_score": 0.8551454556887333,
"lm_q2_score": 0.8723473829749844,
"openwebmath_perplexity": 418.070640968636,
"openwebmath_score": 0.7734267711639404,
"tags... |
there will be no uncountable compact metric space of cardinality less than continuum. On the other hand, there is only one possibility for the cardinality of a scattered compact metrizable, which is countable. | {
"domain": "wordpress.com",
"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9780517469248845,
"lm_q1q2_score": 0.8293563511751529,
"lm_q2_score": 0.8479677622198946,
"openwebmath_perplexity": 99.66562212800767,
"openwebmath_score": 0.9851532578468323,
"tags": ... |
If $a$ is rational, $a^2-a-4$ is rational. What is $a^2-a-4$ when $a=\sqrt[3]2+\sqrt[3]4$?
(After you work that out, I bet you'll wonder where I got $a^2-a-4$ from. Or, try to figure it out yourself. Now that you have a sort of idea on how to deal with this sort of problem, I leave you with another, similar problem: W... | {
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"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9833429634078179,
"lm_q1q2_score": 0.8490100608765344,
"lm_q2_score": 0.8633916064586998,
"openwebmath_perplexity": 328.9215594630196,
"openwebmath_score": 0.86919105052948,
"tags"... |
r, ggplot2
"241" 145 "Sample1" 552281
"242" 145 "Sample2" 496389
"243" 146 "Sample1" 543184
"244" 146 "Sample2" 487283
"245" 147 "Sample1" 532683
"246" 147 "Sample2" 477035
"247" 148 "Sample1" 520019
"248" 148 "Sample2" 461698
"249" 149 "Sample1" 510484
"250" 149 "Sample2" 451095
"251" 150 "Sample1" 507832
"252" 150 "... | {
"domain": "bioinformatics.stackexchange",
"id": 1253,
"lm_label": null,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "r, ggplot2",
"url": null
} |
python, beginner, python-3.x
# total non current liabilities
long_term_debt = float(input("Long term debt: "))
stockholders_equity = float(input("Stockholders' Equity: "))
total_debt = float(input("Total Debt: "))
break
except ValueError:
print("please enter only numbers wi... | {
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"tags": "python, beginner, python-3.x",
"url": null
} |
c++, performance, memory-management, vectors, reinventing-the-wheel
void insert(const size_t& pos,const size_t& n,const T& val) // Insert "n" elements of value "val", beginning from "pos"..
{
if(vector_size<n+vector_capacity)
reserve(vector_size+n); // Create space for atleast "n" eleme... | {
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"tags": "c++, performance, memory-management, vectors, reinventing-the-wheel",
"url": n... |
Not a complete answer, just my idea and thoughts on it so far.
Summary
In short, I have split the problem into $$c\in\mathbb N$$ subproblems. It seems your initial coefficients idea is equivalent to $$c=0,1$$ combined with $$n=n_2+(n_1-1)$$ lemma, so you are missing solutions when $$c\ge 2$$ is not reachable by the l... | {
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"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9780517424466174,
"lm_q1q2_score": 0.8085669044283577,
"lm_q2_score": 0.8267117876664789,
"openwebmath_perplexity": 315.05535077133874,
"openwebmath_score": 0.8281347751617432,
"ta... |
python, python-2.x, multithreading, csv, network-file-transfer
I would switch to a NamedTuple instead of a separate class:
from collections import namedtuple
Image = namedtuple('Image', ('master_id', 'url'))
Or, if you are going to stay with classes, consider adding __slots__ - may help performance-wise - though thi... | {
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"tags": "python, python-2.x, multithreading, csv, network-file-transfer",
"url": null
... |
a set C in a Topological space examples 1 x0 ∈ X with a b! Distance is exactly equivalent to being the same point every R > 0, let X be arbitrary... As usual, let ( X, d ) be a metric space, X n is an such:! Spaces could also have a special name for metric spaces where Cauchy sequences converge, sequences, matrices,.. ... | {
"domain": "gridserver.com",
"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9458012762876287,
"lm_q1q2_score": 0.8165968949606517,
"lm_q2_score": 0.8633916187614823,
"openwebmath_perplexity": 663.4398473845879,
"openwebmath_score": 0.8302062749862671,
"tags":... |
c++, circular-list, winapi
void ComLib::UpdateRBD(size_t value)
{
//Check who wants to update; producer and consumer can only update
//their respective value (head/tail)
if (this->type == ComLib::TYPE::PRODUCER)
{
CopyMemory((PVOID)ringBufferData.GetBuffer(), &value, sizeof(size_t)); //First sl... | {
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "c++, circular-list, winapi",
"url": null
} |
object-oriented, comparative-review, php5, finance
Title: How to use PHP Visibility method? At my new job, with new young developers, we are seriously discussing improving code structure and performance. (They keep more than 80 lines of code in a method). However I've read more tutorials, and based on my experience, I... | {
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"tags": "object-oriented, comparative-review, php5, finance",
"url": null
} |
machine-learning, classification, multiclass-classification, semi-supervised-learning
# check masked sentiment distribution
print("Masked sentiment distribution:\n", df['Sentiment_masked'].value_counts())
X = df['OriginalTweet']
y = df['Sentiment_masked']
stclf = SelfTrainingClassifier(
base_estimator = RandomFo... | {
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"id": 10431,
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"tags": "machine-learning, classification, multiclass-classification, semi-supervised-l... |
equilibrium, entropy
= G(C)_{t=0} + G(D)_{t=o} - G(A)_{t=0} - G(B)_{t=0} = - G(A)_{t=0} - G(B)_{t=0} < 0}$$ As $\ce{\Delta G_r}$ is negative, the reaction can proceed. So the reaction starts, and both [$\ce{A}$] and [$\ce{B}$] decreases. Simultaneously, [$\ce{C}$] and [$\ce{D}$], being zero in the beginning, are becom... | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "equilibrium, entropy",
"url": null
} |
specific-reference, history
Title: Lorentz's Amsterdam Proceedings 12:986 (1904) paper? I am looking for this paper by H. A. Lorentz:
Amsterdam Proceedings 12 (1904) 986. (See also Arch. Neér. Sciences Exactes et Naturelles 25 (1882) 363.)
I have also seen it cited using the journal abbreviation "Verl.":
Verl. 1̲2̲... | {
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"tags": "specific-reference, history",
"url": null
} |
python, python-2.x, api, tkinter, cryptocurrency
#options display
self.controls_view = tk.LabelFrame(parent, text='Controls')
self.controls_view.grid(row=1, column=0, sticky=tk.E+tk.W)
key_label = tk.Label(self.controls_view, text='API Key')
key_label.grid(row=0, column=0,sticky=tk.E+t... | {
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"id": 30849,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "python, python-2.x, api, tkinter, cryptocurrency",
"url": null
} |
rviz, pcl, pointcloud
Title: PCD visualization in Rviz [closed]
Hi Community!
I'm trying to import and manipulate a PCD file in C++ code then visualize the results in Rviz. I feel like this is an easy problem to solve with a couple lines of code but I can't seem to figure them out. I have successfully connected Rviz ... | {
"domain": "robotics.stackexchange",
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"tags": "rviz, pcl, pointcloud",
"url": null
} |
slam, navigation, ros-groovy
#11 0x00000000004a9891 in OpenNIListener::kinectCallback (this=0x7fffffffc220,
---Type <return> to continue, or q <return> to quit---
visual_img_msg=..., depth_img_msg=..., point_cloud=...)
at /home/iriss/ros/rosbuild_ws/rgbdslam_freiburg/rgbdslam/src/openni_listener.cpp:505
#12 0... | {
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"id": 13672,
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"openwebmath_score": null,
"tags": "slam, navigation, ros-groovy",
"url": null
} |
c, game-of-life
while(true){
//sleep(1);
wait(0.25);
printf("\e[1;1H\e[2J");
board = step(board);
printArray(board);
}
freeArray(board);
} Here are some things that may help you improve your code.
Fix the bug
The code currently includes this line in initialPosition:
*(e... | {
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"tags": "c, game-of-life",
"url": null
} |
cc.complexity-theory, ds.algorithms, sorting
Since a comparison with $1/2+n^{-0.5}$ yes probability only wastes $O(1/n)$ entropy, the initial randomization and the slight nonuniformity of the elements in their bounding intervals should only need $n^{o(1)}$ entropy waste. If the distribution shaping succeeds well enou... | {
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} |
(The only wat to prove this I can think of would be constructing a family of manifolds parametrized by $$\mathbb{R}^{n^2 (n^2 - 1)/12}$$ such that for a given $$p \in \mathbb{R}^{n^2 (n^2 - 1)/12}$$ the corresponding manifold has the curvature tensor corresponding to $$p$$ at some point.)
• lower bound on what ? – Amr... | {
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"lm_q1_score": 0.9793540662478147,
"lm_q1q2_score": 0.8029658702614084,
"lm_q2_score": 0.8198933337131076,
"openwebmath_perplexity": 101.20793232948937,
"openwebmath_score": 0.9531306028366089,
"ta... |
orbit, gravity, oort-cloud
However, the universe is NOT otherwise empty. The nearest other stars are about 4 light years from the Sun at the moment, so a body more than two lightyears away will typically feel equally strong attraction from other stars as from the Sun, and so will not really orbit the sun.
That's a bit... | {
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"tags": "orbit, gravity, oort-cloud",
"url": null
} |
homework-and-exercises, newtonian-mechanics, forces, free-body-diagram
Since in Equations (1) and (2) I'd already put all on x-axis component equations, third law implies that their module is equal, $F_{AB} = F_{BA}$ without the need to insert an extra sign. The issue arises because $F_{AB}$ is treated with two differ... | {
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"url": ... |
reflects the important distinction between data description and inference, one that all researchers should appreciate. Definition of standard error in the Definitions.net dictionary. {\displaystyle \sigma } This makes sense, because the mean of a large sample is likely to be closer to the true population mean than is t... | {
"domain": "mecaartfair.com",
"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9546474181553805,
"lm_q1q2_score": 0.8542084442330713,
"lm_q2_score": 0.8947894562828415,
"openwebmath_perplexity": 773.6649043747163,
"openwebmath_score": 0.8511279225349426,
"tags"... |
python, python-3.x, regex, state-machine
Your call to the self._single_state_closure(state) is only ever performed at this one place in the code (not worthy of a separate function and is confusing if people have to "pop out" when reading your code).
Also, your def _at(self, state: int, char: str) function too is only ... | {
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"tags": "python, python-3.x, regex, state-machine",
"url": null
} |
newtonian-mechanics, conservation-laws, collision, computational-physics, software
I understand that the amount of acceleration on collision is proportional to the objects' kinetic energy, but I have no idea on how to apply this kinetic energy to the vector of each object.
Here's what i have so far:
@Override
public v... | {
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"tags": "newtonian-mechanics, conservation-laws, collision, computational-physics, software... |
electromagnetism, potential, relativity
Finally, let me briefly address Example 9-1.1, which should prove that (quoting) "Lorentz contraction is not a true physical effect".
He shows that integrating Heaviside's formula for the electric field of a moving point charge along a line gives the electric field produced by a... | {
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"tags": "electromagnetism, potential, relativity",
"url": null
} |
neuroscience, neurophysiology, neurotransmitter
Calcium signaling
NMDAR meditated LTP/LTD
GPCR's | {
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"tags": "neuroscience, neurophysiology, neurotransmitter",
"url": null
} |
javascript, jquery, game, html5, snake-game
default:
};
};
};
// ----------- GAME FUNCTIONS ------------------------------------------------------------
// GAME FLOW
function gameStart(){
var int=self.setInterval(function(){snakeAnimation()},snakeSpeed);
fun... | {
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"tags": "javascript, jquery, game, html5, snake-game",
"url": null
} |
ros, gazebo, ros-kinetic
<leftJoint>front_joint_left_wheel</leftJoint>
<wheelSeparation>0.2</wheelSeparation>
<wheelDiameter>0.2</wheelDiameter>
<torque>0.5</torque>
<commandTopic>cmd_vel</commandTopic>
<odometryTopic>odom</odometryTopic>
<odometryFrame>odom</odometryFrame>
<r... | {
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"id": 34770,
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"tags": "ros, gazebo, ros-kinetic",
"url": null
} |
python, error-handling, library, web-scraping, beautifulsoup
Title: RateBeer.com scraper This was largely an exercise in making my code more Pythonic, especially in catching errors and doing things the right way.
I opted to make the PageNotFound exception part of the class so that users could simply from ratebeer imp... | {
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"tags": "python, error-handling, library, web-scraping, beautifulsoup",
"url": null
} |
kinematics
Let us take a look into a robotics laboratory and how new robotics are developed. The first thing what the engineers are doing is to build the frame. It is better known as a harness. On that chassis the robot is mounted. What is the intention of mounting a robot on a frame? Right, the intention is to build ... | {
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"tags": "kinematics",
"url": null
} |
electrochemistry
$$V+V_1+V_2=0$$
So here we have a contradiction. Both $V_1$ and $V_2$ are positive, but so should be $V$, because of our explicit assumption of how the terminals are connected. But this equation tells us that $V$ is negative!
So what is wrong with this line of reasoning?
Thank you.
We can't write a r... | {
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"tags": "electrochemistry",
"url": null
} |
nuclear-physics, schroedinger-equation, fermions, pions
Title: Yukawa interaction and Dirac fields I have been reading about the Yukawa interaction https://en.wikipedia.org/wiki/Yukawa_interaction, which apparently is also used to model the nuclear force between nucleons. The fermions are considered to be relativistic... | {
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ros, ar-pose, ardrone-autonomy, tum-simulator, ardrone
Originally posted by Dan Lazewatsky with karma: 9115 on 2014-12-01
This answer was ACCEPTED on the original site
Post score: 3
Original comments
Comment by l0g1x on 2014-12-02:
Agreed. This would cause a issue
Comment by green96 on 2014-12-04:
I have added white ... | {
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communication, entanglement-swapping
Is this cost some function of $L$ and the number of qubits (in this case $4$). And if there is some transmission cost how does one reduce this?
Can somebody atleast give some references? I'm unsure of this exact protocol you're referring to, but if you're interested in the "cost" o... | {
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of mirror descent ¥ Convergence analysis f (xt)+!! f (xt),x " xt " " 1 2!t #x " xt#2 2 Mirror descent 5-2 Convex and Lipschitz problems minimizex f (x) subject to x ! C ¥ f is convex andLf-Lipschitz continuous Mirror descent 5-35 Outline. It follows that: wt+1 = wt ;. Gradient descent is a first-order iterative optimiz... | {
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The claim that placing the $$x_i$$ at the vertices of a regular $$(n-1)$$-simplex and $$y$$ at the centroid of this simplex is optimal has been proven many times before in many different contexts. For example, it is implied by a bound known by various substrings of "the Welch-Rankin simplex bound" in frame theory. Here... | {
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quantum-mechanics, operators, momentum, hilbert-space, fourier-transform
What I am interested in is what is the more fundamental derivation for the position operator: $$\hat{X} = x.$$ To this point I have considered that the motivation for defining position operator is from the definition of the expectation value $$\l... | {
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yt = v + A1yt 1 + + Apyt p + B0xt + B1Bt 1 + + Bsxt s + ut. Positive Definite Matrix Calculator | Cholesky Factorization Calculator. bobby, You need to pass in the array as parameter, also I can see the variant 'A' has been assigned as the range 'mat' and you are then trying to access 'A' as an array which is a type mi... | {
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... |
as | | = B be two matrix, det! ( 0,18,4 ) \$ determinant of any matrix with two iden-tical columns is 0 ( a ) = (. Several rows or columns ) of a matrix… 4.The determinant of Inverse matrix... N× n matrix has two identical rows or columns, its determinant is unchanged … \$ -2 \$ times second... Is row equivalent to a u... | {
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"tags": ... |
We can see now that there may be merit in discarding variables thought to be measuring the same underlying (but "latent") aspect of a collection of variables, because including the nearly-redundant variables can cause the PCA to overemphasize their contribution. There is nothing mathematically right (or wrong) about su... | {
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"openwebmath_score": 0.6238919496536255,
"ta... |
Possible Solution: I've tried the literal average of percent changes but there is a reason I don't think that fairly represents the improvement of the set of data. For example if you have the numbers 10, 7, 2, 5, 4 the percent changes between these numbers are-> -30, -71, 150, -20. The average of these 4 changes is 7.2... | {
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"tag... |
Noting that $$|S_n(x)| \leqslant \frac{1}{|\sin(x/2)|}$$ and $$|\sin(x/2)| \geqslant \frac{2}{\pi}\frac{x}{2} = \frac{x}{\pi}$$ for $$x \in (0,\pi)$$ we have,
$$\left|\sum_{k=m+1}^{n}\frac{\sin kx}{k}\right| = \left|\frac{S_n(x)}{n} - \frac{S_m(x)}{m+1} + \sum_{k=m+1}^{n-1} S_k(x) \left(\frac{1}{k} - \frac{1}{k+1} \ri... | {
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"lm_q2_score": 0.8397339696776499,
"openwebmath_perplexity": 206.37139458170697,
"openwebmath_score": 0.9841662049293518,
"ta... |
# Finding an Interval of Convergence
1. Sep 2, 2008
### Battlemage!
1. The problem statement, all variables and given/known data
Find the interval of convergence of the infinite series:
(x-1)n / 2n
n = 1
2. Relevant equations
Using the ration test. It converges if the absolute value of the limit of f(n+1)/f(n) a... | {
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"openwebmath_score": 0.8711248636245728,
"tag... |
mechanisms
The drawing above is not to scale and placement of the pulleys are not critical. The individual segments to be extended would require guiding mechanisms as the segments are offset from the centerline. In the case of the antenna tower, the guiding mechanisms were a combination of low-friction plastic guide b... | {
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Apart from splitting them, there are other ways to fix overly long paragraphs, such as
• using ordered or un-ordered lists, or
• presenting the content in another way, e.g., using tables or figures.
Placement of mathematical expressions
Mathematical expressions should be part of the flowing text, even if the express... | {
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"openwebmath_score": 0.8438490629196167,
"... |
image-classification, overfitting, vgg16
And if someone could explain how high validation loss (even if validation accuracy is high) could impact the model?
Validation loss measures how generalizable your model is to unseen data. If your training loss and validation loss don't improve during training, then you are un... | {
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homework-and-exercises, electrostatics, conservation-laws, charge, dirac-delta-distributions
Title: Continuity equation for a charged particle I am trying to prove the continuity equation for a charged particle moving with some speed v. So, I start with the charge density and current density as,
\begin{align}
\rho(x,t... | {
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"tags": "homework-and-exercises, electrostatics, conservation-laws, charge, dirac-delta-dis... |
quantum-mechanics, hamiltonian, semiclassical
You have not included the atom's resonant frequencies $\omega_n$. However, you correctly noticed that, quantum mechanically, the $e^{\pm i \omega t}$ terms correspond to annihilation and creation operators of photons, and so only one of the will contribute to the transitio... | {
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"tags": "quantum-mechanics, hamiltonian, semiclassical",
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ros2, c++, opencv, cv-bridge
rclcpp::TimerBase::SharedPtr timer_;
rclcpp::Publisher<sensor_msgs::msg::Image>::SharedPtr publisher_;
size_t count_;
};
int main(int argc, char *argv[]) {
printf("Starting...");
rclcpp::init(argc, argv);
rclcpp::spin(std::make_shared<MinimalPublisher>());
rclcpp... | {
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In fact the Hlawka's inequality first appeared (as a special case of more general result) in H. Hornich, Eine Ungleichung für Vektorlängen, Mathematische Zeitschrift 48 (1942), 268-274 http://gdz.sub.uni-goettingen.de/dms/load/img/?PPN=PPN266833020_0048&DMDID=DMDLOG_0025&LOGID=LOG_0025&PHYSID=PHYS_0256 (see p. 268. P.S... | {
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"lm_q2_score": 0.9059898273638386,
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"openwebmath_score": 0.8869770765304565,
"tags"... |
php, unit-testing, bdd
Again I wonder about mutability of these class objects and whether it is appropriate as shown.
You are allowing this class to be set up in a bad state. Your calculateAverageMileage() method will throw exception if their is no first registration date, so why not enforce that a first registration... | {
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• I have no idea why two people voted to close; this seems like a fine question to me. – Qiaochu Yuan Dec 31 '17 at 5:07
• @Qiaochu I agree. It seems like a very natural question to me. And the answer does not seem clear off the top of my head. – Tobias Kildetoft Dec 31 '17 at 8:56
• I don't understand the motivation t... | {
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"lm_q2_score": 0.8354835432479661,
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"openwebmath_score": 0.9460476040840149,
"tags... |
black-hole, gravity, general-relativity, newtonian-gravity
The GR approach to gravity is fundamentally and philosophically different to Newtonian gravity. For Newton, gravity is a universal force. In GR, gravity is not a force at all. Freefalling bodies are said to be "inertial". They accelerate, not because a force a... | {
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} |
The matrix of the values is known as the moment of inertia tensor. 0 kg m2 The moment of inertia of a solid sphere of radius of 0. need to use the parallel axis theorem to get the expression for the moment of inertia about that pivot. system of units, the units of I are. How do find the moment of inertia? The answer to... | {
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"lm_q2_score": 0.8267117919359419,
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"openwebmath_score": 0.6377691030502319,
"ta... |
c++, thread-safety, concurrency, queue, producer-consumer
/**
* Add a new element to the queue.
*
* @link Dequeue()
* @link FSequentialInteger::Get()
* @link TSequentialContainer::IncrementAndGetOldValue()
* @param NewElement The new element to add to the queue.
*
* @return An e... | {
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"tags": "c++, thread-safety, concurrency, queue, producer-consumer",
"url": null
} |
radian has no dimensions so the left side and right side of the above equation end up being the same.
Basically do the same with the given equation and you should see why the equation works out.
TR is the torque exerted on the drum by the rope. Do you know Newton's second law of motion:
Force = mass x acceleration
... | {
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"lm_q2_score": 0.8244619285331332,
"openwebmath_perplexity": 741.3802911113556,
"openwebmath_score": 0.9710547924041748,
"tags... |
f#, clustering
kmc1_2D data2 centroids
|> Seq.map (string)
|> Seq.iter (printfn "%s")
printfn "\nEND 2D"
let data3 = createData 1000 3
kmc1_3D data3 centroids
|> Seq.map (string)
|> Seq.iter (printfn "%s")
printfn "\nEND 3D"
printfn "\nEND PROGRAM"
Console.ReadKey(true)
|> ignore | {
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c, linked-list, generics, collections, macros
\
new_node->next = node; \
node->prev = new_node; \
\
node-... | {
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"openwebmath_score": null,
"tags": "c, linked-list, generics, collections, macros",
"url": null
} |
marine-biology
Title: How much can a blue whale lift? A simple question really. Given that the buoyancy in water kind of helps them under water, I'd specifically like to know, if there was, for Example, a boat, how heavy could it be that the blue whale could still push it out of the water. As I know about that and do ... | {
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"id": 10953,
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"lm_q2_score": null,
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"openwebmath_score": null,
"tags": "marine-biology",
"url": null
} |
newtonian-mechanics, rotational-dynamics, reference-frames, rigid-body-dynamics, angular-velocity
Suppose I find the torque about the center of mass (I chose COM because it simplifies the equations, no need to add pseudo torques).
But the direction of torque doesn't always point towards the axis of rotation (if it do... | {
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"tags": "newtonian-mechanics, rotational-dynamics, reference-frames, rigid-body-dynamics, a... |
c++, programming-challenge, linked-list
Instead, use smart pointers; specifically, allocate with std::make_unique (C++14), to get an allocation which will be released automatically and never leak. Of course - if you used std::list, you wouldn't have to allocate anything anyway.
More on this in C++ Core guidelines Sect... | {
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"tags": "c++, programming-challenge, linked-list",
"url": null
} |
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