text stringlengths 1 1.11k | source dict |
|---|---|
c++, beginner, c++11, homework, floating-point
In your case, it seems that getSanitizedDouble could simply return the read long double instead of having an out parameter.
Type correctness
You could improve your type correctness:
That's also a naming issue: I don't expect a function named getSanaitzeDouble to return a... | {
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"tags": "c++, beginner, c++11, homework, floating-point",
"url": null
} |
physical-chemistry, thermodynamics
Title: Enthalpy in adiabatic process
A gas adiabatically expanded from $\pu{32atm}$ and $\pu{273K}$ to $\pu{1atm}$ and $\pu{251K}$, Calculate Joule-Thomson coefficient $\mu$ at $\pu{273K}$.
Answer:
$$\mu = {\Delta T \over \Delta p} = {-22 \over -31} = 0.7$$
I think the answer uses... | {
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"tags": "physical-chemistry, thermodynamics",
"url": null
} |
ros2
Title: ros2: is it possible? code, message and action definitions in the same package
I have a package with actions, messages and code.
The code references the action and messages. However there is a compilation error. It looks like the action include files are not found during the colcon build command.
The ques... | {
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"tags": "ros2",
"url": null
} |
python, performance, python-3.x, graphics, pyglet
@win.event
def on_draw():
win.clear()
batch.draw()
fps.draw()
@win.event
def on_mouse_drag(x, y, dx, dy, buttons, modifiers):
global coords
for i, shape in enumerate(shapes):
coords[i][::2] += dx
coords[i][1::2] += dy
shape.... | {
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"tags": "python, performance, python-3.x, graphics, pyglet",
"url": null
} |
java, spring
Answering your question: "what is better to use interface with one implementation and inject interface or just create a class without interface and inject class?"
I recommend using an interface even if it has only one implementation, so in the future if the implementation changes, the class that depends o... | {
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"tags": "java, spring",
"url": null
} |
Theorem 1: Every continuous light map ${f\colon X\to Y}$ with compact domain ${X}$ admits a lower oscillation bound.
Proof. Suppose not. Then there exists ${\epsilon>0}$ and a sequence of connected subsets ${E_n\subset X}$ such that ${\textrm{diam}\, E_n\ge \epsilon}$ and ${\textrm{diam}\, f(E_n)\to 0}$. We can assume... | {
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"lm_q1q2_score": 0.8179052448726707,
"lm_q2_score": 0.8267118026095991,
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"openwebmath_score": 0.8424909710884094,
"tags":... |
The simplest way would be; let $$\color{fuchsia}{P_n=\frac{x^n}{n!}=} \color{maroon}{\frac x1.\frac x2.\frac x3\cdots\frac x{x-1}.\frac xx.\frac x{x+1}\cdots\frac x{n-1}.\frac xn}$$ Then $$\color{maroon}{0}\color{red}{<}\color{fuchsia}{P_n}\color{red}{<}\color{maroon}{\frac x1.\frac x2\cdots\frac{x}{x-1}.\frac xx.}\col... | {
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"lm_q1_score": 0.987758723627135,
"lm_q1q2_score": 0.8165917886273468,
"lm_q2_score": 0.8267117962054048,
"openwebmath_perplexity": 264.2504921652551,
"openwebmath_score": 0.9810930490493774,
"tags... |
reinforcement-learning, convergence, temporal-difference-methods
where $\alpha_t(s, a)$ is the learning rate at time step $t$ (that can depend on the state $s$ and action $a$), and that each state is visited infinitely often.
(The Robbins-Monro conditions (1 and 2) are due to Herbert Robbins and Sutton Monro, who sta... | {
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"openwebmath_score": null,
"tags": "reinforcement-learning, convergence, temporal-difference-methods",
"url": null
} |
error-analysis, differential-equations, statistics
and, again, similarly for the other pairs of variables.
So now we have our variances and covariances for all of our variables in the main function, which means we can finally evaluate $\sigma_{x'}$:
$$\sigma_{x'}^2=\left(\frac{\partial f}{\partial x}\right)^2\sigma_x^... | {
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"tags": "error-analysis, differential-equations, statistics",
"url": null
} |
c, hash-map, set, c89
return iterator->expected_mod_count != iterator->set->state->mod_count;
}
void unordered_set_iterator_free(unordered_set_iterator* iterator)
{
if (!iterator)
{
return;
}
iterator->set = NULL;
iterator->next_entry = NULL;
free(iterator);
}
static int int_equals(v... | {
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"tags": "c, hash-map, set, c89",
"url": null
} |
c++
// Take the ENTIRE QUEUE. Even if there are multiple messages, this could
// still be thousands of times faster than copying a SINGLE message into a
// buffer, and that's not even taking into account the gains you get from
// avoiding multiple locking and unlocking and waiting cycles.
... | {
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"openwebmath_score": null,
"tags": "c++",
"url": null
} |
wavelet, time-frequency, visualization, cwt, scattering
If we increase scale of invariance, we may tell that words are spoken, but not what the words are, nor possibly their place in sentence.
If we lower, we may capture expression in pronouncing individual letters, but confuse which word (or letter) is spoken due to ... | {
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"tags": "wavelet, time-frequency, visualization, cwt, scattering",
"url": null
} |
genetics, population-genetics
I've come across this concept many times and there's a question that comes to my mind every time I read it.
Let us suppose the character we are trying to establish is dominant trait controlled by a biallelic gene and the two individuals (animals) we have selected to inbreed both have t... | {
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"tags": "genetics, population-genetics",
"url": null
} |
javascript
for(var i=0; i<tObj.rows.length; i++){
if(tObj.rows[i]!=null){
for(var j in tObj.rows[i].cells){
if(tObj.rows[i].cells[j].innerHTML){
for(var k = 1; k < tObj.rows[i].cells[j].colSpan; k++){
tObj.rows[i].deleteCell(parseInt(j) + ... | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "javascript",
"url": null
} |
bacteriology, digestive-system, ornithology
Title: Are there grass or fiber eating birds? My understanding, that may be wrong, is that cellulose/fibre has little nutritional value to many animals because it's hard to break down thus making consumption inefficient. However, Ruminating mammals, other mammals such as bla... | {
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"tags": "bacteriology, digestive-system, ornithology",
"url": null
} |
# Math Help - The boundary of a two variable function's Domain
1. ## The boundary of a two variable function's Domain
Why the boundary of a two variable function's domain like $f(x,y) = \frac{y}{x^2}$
is $x=0$ and for $f(x,y) = x.y$ there's no boundary? According to the definition,
a point in a region $R$ is a bounda... | {
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"tag... |
If you pull out the denominator, the numerator sums to $\frac{n(n+1)}{2}$, then $n^2$ term cancels out and when you take the limit you get $\frac{1}{2}$
You have asked where you are mistaken, so I will only answer this. You have tried to apply the limit individually to the summands. There is a rule which allows you to... | {
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"lm_q2_score": 0.824461932846258,
"openwebmath_perplexity": 261.86458661255557,
"openwebmath_score": 0.922511637210846,
"tags... |
java
String clientOneInterests = clientDetails[b].getClientInterests();
String clientTwoInterests = clientDetails[c].getClientInterests();
int interestNumber = 0;
while (interestNumber < clientOneInterests.length())
{
... | {
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"tags": "java",
"url": null
} |
time-series, logistic-regression, logistic
logistic_args = (1,1,1)
logistic_function = get_logistic(*logistic_args)
x = np.linspace(-10,10)
x_minus_1 = x-1
y = logistic_function(x)
y_of_x_minus_1 = logistic_function(x_minus_1)
plt.plot(1/y_of_x_minus_1, 1/y)
plt.show()
pd.DataFrame({'x': x, 'x_less_1': x_minus_1, '... | {
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"tags": "time-series, logistic-regression, logistic",
"url": null
} |
friendly-ai
The question whether a piece of code is friendly, can very likely be reduced to a variant of the halting problem.
An AI that operates in the real world, which is a requirement for "friendliness" to have a meaning, would need to be Turing complete. Input from the real world cannot be reliably interpreted us... | {
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"tags": "friendly-ai",
"url": null
} |
tensorflow, dataset, data
Title: data.iterrows() + plt.imread() alternative, really exhausting Currently, I'm loading my images for the training model with TensorFlow, like this:
for index, datum in data.iterrows():
sat_name = directory_path+datum['sat_image_path']
sat_img = plt.imread(sat_name)
sat = cv.resize(... | {
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "tensorflow, dataset, data",
"url": null
} |
evolution, natural-selection, population-dynamics, population-genetics, definitions
Title: What does "Mutational Variance" mean? Background
The concept of mutational variance can be found in many articles including this one for example. The mutational variance of a trait number $i$ can be found in the M-matrix in posi... | {
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"lm_q2_score": null,
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"openwebmath_score": null,
"tags": "evolution, natural-selection, population-dynamics, population-genetics, definitions... |
python, graph, depth-first-search, memoization
...
for direction in tile.directionals.values():
if ...:
helper(direction, word + direction.letter)
Imagine if we've called the helper a few times, and we've just recursed in with word="TRAPS". We start looping around the tiles aroun... | {
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"tags": "python, graph, depth-first-search, memoization",
"url": null
} |
## probability Expected value of this continuous RV
scipy.stats.rv_discrete — SciPy v1.3.2 Reference Guide. Probability Functions Discrete (pdf) Continuous (pdf) Basic probability Notation and definitions Conditional probability discrete RV's Definitions and Formulas (pdf) Tutorial (pdf) Discrete random variables Co... | {
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"lm_q1_score": 0.966410491447634,
"lm_q1q2_score": 0.8214210689290479,
"lm_q2_score": 0.8499711832583695,
"openwebmath_perplexity": 529.2598044826451,
"openwebmath_score": 0.8881303071975708,
"tags":... |
javascript, jquery, html, css, html5
Title: On hover, hide text and display options Recently I learned HTML+CSS and a bit of jQuery and am building various web-things to stretch my skills and learn more about how to do things the right way. I was a bit surprised at just how many different ways there are to do the sam... | {
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"tags": "javascript, jquery, html, css, html5",
"url": null
} |
c#, tree, interview-questions, iterator, breadth-first-search
namespace DesignPatternsQuestions
{
[TestClass]
public class TreeNodeTest
{
[TestMethod]
public void IteratorTreeNodeTest()
{
TreeNode<int> treeNodeList = new TreeNode<int>();
TreeNode<int> left = ... | {
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"tags": "c#, tree, interview-questions, iterator, breadth-first-search",
"url": null
} |
(1) (2) , (3) Set of all points in a plane equidistant from a fixed point. (iv) Mark 2 points X and Y which are at a distance of 3. Comparing equation (6) with the Fourier Series given in equation (1), it is clear that this is a form of the Fourier Series with non-integer frequency components. Find The Parametric Equat... | {
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"lm_q1_score": 0.9910145696551569,
"lm_q1q2_score": 0.8423338188635793,
"lm_q2_score": 0.8499711756575749,
"openwebmath_perplexity": 236.3292171589137,
"openwebmath_score": 0.6133164763450623,
"tag... |
c#, object-oriented, game, multithreading, collision
case Keys.S:
gameController.MovePaddle(1, Pong.Move.Down);
break;
}
}
}
}
} IGameView.cs
You have a method called Release with the comments... | {
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"tags": "c#, object-oriented, game, multithreading, collision",
"url": null
} |
ajax
$('#results').show(1000).html(response);
}
});
});
$('input[type=radio][name=mbdata]').on('change', function() {
$.ajax({
type: "POST",
url: "results.php",
data: "monthlydata=" + $(this).val(),
success: function(response){
$('#results').sh... | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "ajax",
"url": null
} |
physical-chemistry, quantum-chemistry, molecular-orbital-theory
$$\Psi_{H_2}=c_1\psi_{1s}+c_2\psi_{1s'}$$
Here, $\psi_{1s}$ and $\psi_{1s'}$ are the atomic orbitals of each hydrogen atom.
The derivation that the professor used is similar to the one here: http://www.pci.tu-bs.de/aggericke/PC4e/Kap_II/H2-Ion.htm
In the ... | {
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"openwebmath_score": null,
"tags": "physical-chemistry, quantum-chemistry, molecular-orbital-theory",
"url": null
} |
quantum-mechanics, waves, heisenberg-uncertainty-principle, fourier-transform
The only meaning of "being in phase" can I come up with is that all the $ k_i x,\ i=9,\cdots 15$ are all equal modulo $2\pi$ which in that special case that $k_i=2\pi i,\ i=9,\cdots ,15$ is the largest common divisor of those integer, i.e. 1... | {
"domain": "physics.stackexchange",
"id": 22342,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "quantum-mechanics, waves, heisenberg-uncertainty-principle, fourier-transform",
... |
ros-melodic
Originally posted by sisko with karma: 247 on 2021-03-15
This answer was ACCEPTED on the original site
Post score: 0 | {
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"openwebmath_score": null,
"tags": "ros-melodic",
"url": null
} |
python, game, opengl
The Texture class does not ensure that its instances are valid. For example it is an error to create a Texture object and then immediately call bind (you get a NameError). It is a good idea for classes to ensure that their instances are valid: this makes it harder to accidentally misuse them. In t... | {
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"openwebmath_score": null,
"tags": "python, game, opengl",
"url": null
} |
# Events & Promotions
###### Events & Promotions in June
Open Detailed Calendar
# Doubt in probabilities
Author Message
TAGS:
### Hide Tags
Retired Moderator
Status: 2000 posts! I don't know whether I should feel great or sad about it! LOL
Joined: 04 Oct 2009
Posts: 1712
Location: Peru
Schools: Harvard, Stanford, ... | {
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"openwebmath_score": 0.6645864844322205,
"tags": ... |
qiskit, quantum-circuit, trotterization
Define your Hamiltonian as one of the operator classes supported
by PauliEvolutionGate . e.g., SparsePauliOp
Create a PauliEvolutionGate. Set its operator parameter to be that Hamiltonian.
Pass the gate to SuzukiTrotter.synthesize()
As an example, assume that we have the Hamilt... | {
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"tags": "qiskit, quantum-circuit, trotterization",
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} |
c#
public class Route : IComparable
{
private uint _address;
private uint _mask;
private uint _interface;
private int _metric;
public uint Address { get { return this._address; } }
public uint Mask { get { return this._mask; } }
public uint Interface { get { return this._interface; } }
... | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "c#",
"url": null
} |
In your case it is easy to see that $$\pi_0hAut(S^n\times S^1) =(\mathbb Z/2)^3 =\pi_0O(2)\times\pi_0O(n+1)\times\pi_1O(n+1)$$ and thus that every homotopy equivalence lifts to a homeomorphism. I will compute $S(S^n\times S^1\times I;\partial)=\mathbb Z/2$. So that shows that the answer is either $(\mathbb Z/2)^3$ or a... | {
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"openwebmath_score": 0.8773239254951477,
"tag... |
conventions, units, definition, dimensional-analysis, si-units
Really, in physics, the only time you need to specify the units for an equation is if you have units that cancel or when plotting data. For instance you might have an equation
$$x=1+\left(\frac{m}{M}\right)^2$$ where $[m]=g$ and $[M]=kg$. and here it is es... | {
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"tags": "conventions, units, definition, dimensional-analysis, si-units",
"url": null
} |
• The proof can perhaps be presented a bit more conceptually. Uniqueness of continued fraction forms is easily seen to be equivalent to the statement that each non-negative rational is uniquely reachable, starting from 0, by some sequence of the two operations “add 1”, or “add 1 and invert”. This gives a bijection betw... | {
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"openwebmath_score": 0.9083068370819092,
"tags... |
fft, discrete-signals, bandpass
It multiplies the frequency component's magnitude by some value $A(\omega)$.
It shifts the frequency component's phase by some phase angle $\theta(\omega)$. | {
"domain": "dsp.stackexchange",
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"tags": "fft, discrete-signals, bandpass",
"url": null
} |
general-relativity, black-holes, metric-tensor, curvature, singularities
$$K=-\frac{6}{l^4}$$
which doesn't depends on $r$ at all, thus didn't have a curvature singularity.
However, in many sources the BTZ black hole have another kind of singularity known as conical singularity, is there is some parallel test or opera... | {
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"tags": "general-relativity, black-holes, metric-tensor, curvature, singularities",
"url... |
python, memory-management
And here is the script:
import sys
import re
def RepresentsInt(s):
try:
int(s)
return True
except ValueError:
return False
#recursive function that traces through a mem-node structure
#setting each node's check_flag to 1 if traversed
def node_trace(pointer, ... | {
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# Prove that $\lfloor x\rfloor \geq y$ if, and only if, $x\geq\lceil y\rceil$
I have some trouble proving that if $$x,y\in\mathbb{R}$$ then $$\lfloor x\rfloor \geq y$$ if, and only if, $$x\geq\lceil y\rceil$$.
I have tried some different approaches, the most recent being a proof by contradiction: Assume (for contradi... | {
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"openwebmath_score": 0.9199579954147339,
"ta... |
Posted 1 month ago
Usually, leading zeros are not considered. As they say in the paper referenced above: It will be noted that we have excluded 0 as a leading digit. If we do not do this, the length of the longest left-truncatable prime becomes indeterminate since, for example, there are, with probability one, infinit... | {
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"lm_q1q2_score": 0.8016210360500867,
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"openwebmath_score": 0.2366325557231903,
"tags": n... |
python
but i get this instead:
File "GC_Content.py", line 26, in eachRosalind_DNA
GCcontent.append([i[1:14],(100*(CG/bases))])
ZeroDivisionError: division by zero
i will get the desired output if i just paste the input into the variabe "DNA" without using user input. Please help me fix the code and distinguish ... | {
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"tags": "python",
"url": null
} |
python, beginner, python-3.x
Title: Find the Percentage from HackerRank I am learning python by solving python module from HackerRank. This problem is Find the Percentage.
You have a record of N students. Each record contains the student's
name, and their percent marks in Maths, Physics and Chemistry. The
marks ... | {
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"tags": "python, beginner, python-3.x",
"url": null
} |
ros, roslaunch, ros-lunar, morse
I'll look if can be an error with the state_publisher being deprecated | {
"domain": "robotics.stackexchange",
"id": 30033,
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"tags": "ros, roslaunch, ros-lunar, morse",
"url": null
} |
in the. Calculus PowerPoints and Video Lectures. Plug in the conditions. PART 1: INTEGRALS LECTURE 1. Welcome to r/calculus - a space for learning calculus and related disciplines. Note that some sections will have more problems than others and some will have more or less of a variety of problems. Continuity in Calculu... | {
"domain": "luke-in-beijing.de",
"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.956634203708804,
"lm_q1q2_score": 0.8012959066339387,
"lm_q2_score": 0.8376199633332891,
"openwebmath_perplexity": 1052.7535688955415,
"openwebmath_score": 0.5279259085655212,
"ta... |
python, algorithm, python-3.x
should be
if sympy.isprime(count):
Iteration of a counted variable
count = len(s)//3
while True:
count = count + 1
should be
for count in itertools.count(len(s)//3):
Wrapping
This is a minor thing, but the comments starting at
# This is a SUPER Greedy
are wrapped to a very small c... | {
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"tags": "python, algorithm, python-3.x",
"url": null
} |
objective-c, ios
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
NSInteger rows = 0;
if (section == 0) {
rows = 1;
}
else if (section == 1) {
rows = 2;
}
else if (section == [self transportSection]) {
rows = [planDate.transport... | {
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"tags": "objective-c, ios",
"url": null
} |
classical-mechanics, lagrangian-formalism, constrained-dynamics, degrees-of-freedom
The above paragraph is taken from MECHANICS book by L. D. LANDAU AND E. M. LIFSHITZ.
So, this is in general clear, but I would like to make sure I understand this correctly and that if there is more insight to gain or perspective, woul... | {
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"tags": "classical-mechanics, lagrangian-formalism, constrained-dynamics, degrees-of-freedo... |
php, api, laravel, rest
try {
switch (strtoupper($request->method)) {
case "POST":
return Route::dispatch(Request::create($url, 'POST', []));
case "PUT":
$url .= '/' . $payload['id'];
return Route::dispatch(Request::create($url, 'PUT', [])... | {
"domain": "codereview.stackexchange",
"id": 40994,
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"lm_q1q2_score": null,
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"openwebmath_score": null,
"tags": "php, api, laravel, rest",
"url": null
} |
$A \cap B \subseteq B$.
Hence $A \cap B$ is countable but as you have shown, it need not be empty.
Another counter example would be let $A = \mathbb{R}$ and $B = \mathbb{Q}$, then $A \cap B = \mathbb{Q} \neq \emptyset.$ | {
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"lm_q1q2_score": 0.8422986783593496,
"lm_q2_score": 0.8519527963298947,
"openwebmath_perplexity": 263.8160443497036,
"openwebmath_score": 0.8701200485229492,
"tag... |
python, state-machine
Title: Parsing a text file of nested structures using a state machine My goal is to have something really simple with as small an amount of code as possible. The real code is used to parse a text file of nested structures. This code is highly simplified but is the general way that the state mach... | {
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"tags": "python, state-machine",
"url": null
} |
ros-indigo
void detect(const cv::Mat& image, cv::vector<cv::KeyPoint>& keypoints, std::vector<float>& descriptors, const cv::Mat& mask = cv::Mat()) const;
^
/home/anna/rgbdslam_catkin_ws/src/rgbdslam_v2-indigo/src/node.cpp: In constructor ‘Node::Node(const cv::Mat&, const ... | {
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"tags": "ros-indigo",
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} |
hilbert-transform, c
The FFT process is throught Intel MKL, so in the function above I just considered COMPLEX *cplx_data to be a complex in the form MKL takes and the member .y being its imaginary part.
Then I write to files the input data (sine wave) and output from the HT, and plot them.
So you can see the input ... | {
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"tags": "hilbert-transform, c",
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} |
greater than" -- when the actual meaning is "10 times as great as" -- has no place in mathematics. He concluded with an accidental overstatement of what the “other side” says: I disagree with many of the concessions that other math doctors here have made in interpreting the phrase "x times larger than" as being the sam... | {
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"lm_q1_score": 0.98028087477309,
"lm_q1q2_score": 0.8618107514442109,
"lm_q2_score": 0.8791467564270272,
"openwebmath_perplexity": 909.8569135726916,
"openwebmath_score": 0.7126056551933289,
"tags... |
python, beginner, python-3.x, file-system
print("Welcome to NAME.app")
menu = """\
- Insert name to logg in
- ADD to save new user
- LIST to see saved users
- REMOVE to delete a user
- EXIT to finish
... """
################## USER LOGG IN #######################
while True:
name = input(menu)
if ... | {
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"openwebmath_score": null,
"tags": "python, beginner, python-3.x, file-system",
"url": null
} |
lipid bilayer membranes. How can I calculate the volume? I'm thinking to do the integral of 2+sqrt(4-(x-4)^2) - the integral of 2-sqrt(4-(x-4)^2). ) b) By interpreting the integral as an area, find the volume V of the torus. Torus preset settings for reuse. A torus (donut shape) with a minor radius of r and a major rad... | {
"domain": "angelaleone.it",
"id": null,
"lm_label": "1. YES\n2. YES\n\n",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9895109071934598,
"lm_q1q2_score": 0.8043410793442721,
"lm_q2_score": 0.8128673201042492,
"openwebmath_perplexity": 823.0098102989588,
"openwebmath_score": 0.754847526550293,
"tag... |
ions, stability
$$
\begin{array}{lllll}
\text{Species} & \ce{H2S} & \ce{H3S+} & \ce{H4S^2+} & \ce{H5S^3+} & \ce{H6S^4+} \\
\text{Stable in gas phase?} & \text{Yes} & \text{Yes} & \text{Yes} & \text{Yes} & \text{No} \\
\text{Approximate proton affinity}\ (\mathrm{kJ\ mol^{-1}}) & 752 & -121 & -... | {
"domain": "chemistry.stackexchange",
"id": 11692,
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"tags": "ions, stability",
"url": null
} |
python, web-scraping
return f"https://gematsu.com/{now.year}/{now.month}/media-create-sales-{current_interval}"
Having the complete URL string with placeholders helps to see what the end result might look like.
Note that most of the PEP8 violations mentioned above could be caught by running a linter (like flake8, or... | {
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"openwebmath_score": null,
"tags": "python, web-scraping",
"url": null
} |
reinforcement-learning, comparison, minimax, model-based-methods, model-free-methods
Title: Is the minimax algorithm model-based? Trying to get my head around model-free and model-based algorithms in RL. In my research, I've seen the search trees created via the minimax algorithm. I presume these trees can only be cre... | {
"domain": "ai.stackexchange",
"id": 1726,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "reinforcement-learning, comparison, minimax, model-based-methods, model-free-methods",
... |
newtonian-mechanics, special-relativity, forces, momentum, vectors
\tag{08}\label{08}
\end{equation}
Of course equation \eqref{08} could be extracted directly from \eqref{01} and the low speed approximation since
\begin{equation}
\left(F_1,F_2,F_3\right)\boldsymbol{=}\gamma_{\mathrm u}\mathbf f\boldsymbol{=}\gamma_{\m... | {
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"id": 80651,
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"tags": "newtonian-mechanics, special-relativity, forces, momentum, vectors",
"url": null... |
ds.algorithms, reference-request, exp-time-algorithms
Graph $G'$ has tree width at most $n'\log_2(1+\epsilon) = n$ because $G$ has tree width at most $n$. So $A$ returns a maximum independent set $I'$ for $G'$ in time $2^{o(n')} = 2^{o(n)}$. $I'$ must consist of a maximum independent set $I$ in $G$ together with all ... | {
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"openwebmath_score": null,
"tags": "ds.algorithms, reference-request, exp-time-algorithms",
"url": null
} |
javascript, beginner, react.js, jsx
// not sure why you do this but it smells
this.baseState = this.state
}
inputChange = e => {
let field = e.currentTarget.name
let value = e.currentTarget.value
// this looks fine form a mutation perspective
this.setState(prevState => ({
// why not jus... | {
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "javascript, beginner, react.js, jsx",
"url": null
} |
computability, primitive-recursion, mu-recursion
That is, if $f$ is a function of several arguments then $\mu(f)$ is a partial function which satisfies
$$
\mu(f)(\vec{n}) = k \iff f(\vec{n},k) = 0 \land \forall j < k, f(n,k) \neq 0.
$$
If there is no such $k$ then $\mu(f)(\vec{n})$ is undefined.
Every primitive recurs... | {
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"openwebmath_score": null,
"tags": "computability, primitive-recursion, mu-recursion",
"url": null
} |
javascript, html, angular.js, rest, to-do-list
Title: Angular Todo Lists - Factories? Controllers? I have an angular app using a restful API which works, but I know is structured poorly.
I'm using a projectService (factory) to do all interfacing with the REST back-end, for both of the backend Project and Task models.... | {
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"openwebmath_score": null,
"tags": "javascript, html, angular.js, rest, to-do-list",
"url": null
} |
It’ll help to find the prime factorization of ${100 \choose 3}$, so we expand it:
${100 \choose 3} = {100 \times 99 \times 98 \over 3 \times 2 \times 1} = {2^2 \times 5^2 \times 3^2 \times 11 \times 2 \times 7^2 \over 3 \times 2} = 2^2 \times 3 \times 5^2 \times 7^2 \times 11.$
Dividing out the 5, we need $xyz = 2^2 ... | {
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"id": null,
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"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9902915246646304,
"lm_q1q2_score": 0.8252342819824807,
"lm_q2_score": 0.8333245932423308,
"openwebmath_perplexity": 238.058936626015,
"openwebmath_score": 0.5716345906257629,
"tags":... |
optics, interference
Title: Fabry-Perot Spectroscopy Suppose you have a source of variable wavelength, and you are sweeping the wavelength while monitoring transmission through a Fabry-Perot cavity at normal incidence?
What (qualitatively) could you see if you doubled the length of the cabity? You will see transmissio... | {
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"openwebmath_score": null,
"tags": "optics, interference",
"url": null
} |
matlab, noise, digital-communications, gaussian
How can I simulate carrier frequency offset in MATLAB?
In the following reference 1, the carrier frequency difference (CFD) is used as a feature for distinguishing wireless devices and it is assumed as Gaussian distribution. Why can we assume that this feature is Gaussia... | {
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"tags": "matlab, noise, digital-communications, gaussian",
"url": null
} |
randomness, binary-search-trees
$$
\sum_{x=0}^{n-1} (H_{x+1} + H_{n-x} - 2) =
2 \sum_{i=1}^n (H_i - 1) = 2 \sum_{i=1}^n \sum_{j=2}^i \frac{1}{j} = \\2\sum_{j=2}^n \frac{n-j+1}{j} = 2(n+1)(H_n - 1) - 2(n-1),
$$
which is $2n\ln n - O(n)$. | {
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "randomness, binary-search-trees",
"url": null
} |
inorganic-chemistry, bond, stability
According to my very brief research on the Internet, lithium azide does exist but is unstable. It can be prepared via reaction of $\ce{NaN3}$ and $\ce{Li2SO4}$: see Acta Chem. Scand. 1957, 11, 581 for more details. | {
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quantum-mechanics, hilbert-space, operators
Does that mean the raising operator observed, even if it isn't Hermitian? I assume this is not the case, since I have seen other posts on this website mention that the expectation value can in fact be imaginary. But based on what I did above, I don't see how this is possible... | {
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"url": null
} |
universal-gates, gate-synthesis, quantum-gate
Classically linked lists of quantum data values, in which the data is quantum but the memory addresses are classical pointers to definite qubits or other quantum registers. This is the application of the notion of "linked list of [X]" to the case where 'X' happens to be qu... | {
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"tags": "universal-gates, gate-synthesis, quantum-gate",
"url": null
} |
javascript
Note: That rather than use innerHTML which forces a parsing, page reflow, and knock out event handlers, use textContent if its only text you are writing to the page. It has no parsing or reflow overheads and is safe to use with a page full of event handlers.
Advanced version
This introduces a library type a... | {
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"tags": "javascript",
"url": null
} |
c#, beginner, asynchronous, winforms, task-parallel-library
await Task.WhenAll(childTasks);
}
}));
}
await Task.WhenAll(tasks);
}
} The only important thing, I can see is missing, is to let PauseOrCancelTokenSource implement IDisposable to make it possible to dispose t... | {
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"url": null
} |
However, The Law of Excluded Middle, is not required to produce the usual table for material implication. Don't confuse it with the Law of Non-Contradiction.
The Principle of Explosion -that anything may be a valid conclusion from a contradiction- is required for one of the tableau's rows.
So the "truth table" is v... | {
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"lm_q2_score": 0.849971181358171,
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"openwebmath_score": 0.8036571145057678,
"tags... |
orbital-motion, exoplanets
Title: Calculating eccentric anomaly using the Newton-Raphson method Yesterday I asked a question on calculating the eccentricity of an exoplanet only knowing the radial velocity vs. phase graph an the mass of the star (question). The answer I got helped me a lot, but there is still a proble... | {
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"tags": "orbital-motion, exoplanets",
"url": null
} |
special-relativity, relativity, time-dilation
So what I did was I tried to calculate the amount of time it would take for light to travel between the two people in the spaceship (A and B). The distance between them is $D_x$. That's the distance light travels in the rest frame. Then I calculated the distance it would t... | {
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"tags": "special-relativity, relativity, time-dilation",
"url": null
} |
python, python-3.x, object-oriented, beautifulsoup
def __init__(self):
"""
Initialises the following variables to be used through the course of the translator:
1) response : holds the response object for the link created by the input
2) from_language : holds the nam... | {
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"tags": "python, python-3.x, object-oriented, beautifulsoup",
"url": null
} |
c#, console, web-scraping
namespace EarningEdge
{
class Program
{
static void Main(string[] args)
{
DateTime currDate = new DateTime(Constants.startYear, Constants.startMonth, Constants.startDay);
DateTime endDate = new DateTime(Constants.endYear, Constants.endMonth, Con... | {
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"openwebmath_score": null,
"tags": "c#, console, web-scraping",
"url": null
} |
homework-and-exercises, hamiltonian-formalism, differential-equations, phase-space, poisson-brackets
Title: Hamiltonian from a differential equation In my differential equations course an example is given from the Lotka-Volterra system of equations:
$$ x'=x-xy$$
$$y'=-\gamma y+xy.\tag{1}$$
This is then transformed by ... | {
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"tags": "homework-and-exercises, hamiltonian-formalism, differential-equations, phase-space... |
turtlebot, ros-indigo
[WARN] [WallTime: 1426004245.691961] Rapp Manager : No preferred rapp for 'turtlebot_rapps/xbox360_teleop'. 'turtlebot_rapps/xbox360_teleop' has been selected.
[WARN] [WallTime: 1426004245.692852] Rapp Manager : No preferred rapp for 'turtlebot_rapps/follower'. 'turtlebot_rapps/follower' has be... | {
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"id": 21096,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "turtlebot, ros-indigo",
"url": null
} |
slam, navigation, rviz, hector-slam
Title: hector_slam tutorial errors
When running the Hector_slam tutorial (http://www.ros.org/wiki/hector_slam/Tutorials/MappingUsingLoggedData) using the downloaded .bag file I get a map, but I also get the following errors:
ERROR 1343506441.987975020, 1310297991.330406663: Traject... | {
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"tags": "slam, navigation, rviz, hector-slam",
"url": null
} |
r, bioconductor, gene-ontology
Title: RDAVIDWebService (R package) manual installation, or alternative tool Recently, I had to re-install all my R packages (R version 4.1.0 (2021-05-18) -- "Camp Pontanezen") and it turns out that "RDAVIDWebService" is not available anymore on Bioconductor:
package ‘RDAVIDWebService’ ... | {
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"openwebmath_score": null,
"tags": "r, bioconductor, gene-ontology",
"url": null
} |
quantum-mechanics, eigenvalue, pauli-exclusion-principle
Title: Does degenerate matter have anything to do with the degeneracy of eigenvalues and eigenstates? I came across degenerate matter (not the first time) after learning about degeneracy in eigenstates and eigenvalues. Are the two connected? Or is this just anot... | {
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"url": null
} |
we then recognize the complete elliptic integral of the second kind $E(m)$
$$E(m):=\int_0^{\pi/2}\sqrt{1-m\sin^2u}\mathrm du$$
(where $m$ is a parameter):
$$4\sqrt{2}E\left(\frac12\right)$$
As Robert notes in a comment, different computing environments have different argument conventions for elliptic integrals; Map... | {
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"lm_q2_score": 0.8539127585282744,
"openwebmath_perplexity": 615.6595508973207,
"openwebmath_score": 0.8723611831665039,
"tags... |
English dictionary definition of coefficient. Does a line look like that? For example, suppose we observe r = 0.3 with a sample size of n=50, and we wish to obtain a 95% confidence interval for ρ. that you could say, "Well, as x increases, maybe When one variable is I'll do that one really small, since I don't have muc... | {
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"id": null,
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"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9802808684361289,
"lm_q1q2_score": 0.8463662703340322,
"lm_q2_score": 0.8633916029436189,
"openwebmath_perplexity": 995.673060574931,
"openwebmath_score": 0.6511706113815308,
"tag... |
navigation, ekf, clearpath, actionlib, jackal
OS: Ubuntu 14.04 (laptop), ROS Indigo Igloo (robot)
Robot: Clearpath Robotics Jackal UGV (real, not simulated)
Sensors: IMU, wheel encoders, high accuracy RTK GPS
Localization: package used is robot_localization. There are two instances of ekf_localization_node (local and ... | {
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"id": 26133,
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"tags": "navigation, ekf, clearpath, actionlib, jackal",
"url": null
} |
f#, rss
<channel>
<title>Christopher J. McClellan</title>
<atom:link href="https://christopherjmcclellan.wordpress.com/feed/" rel="self" type="application/rss+xml" />
<link>https://christopherjmcclellan.wordpress.com</link>
<description>Visual Basic, C#, and the Art of Being a Modern Man</description>
... | {
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"tags": "f#, rss",
"url": null
} |
quantum-mechanics, quantum-information, quantum-optics
However, the most interesting feature for the $\Delta \ne 0$ case is that the Rabi frequency increases with increasing detuning, $\Omega = \sqrt{w^2_0 + \Delta^2}$. Using the phase shift picture, one can argue that the detuning can only accelerate the atomic oscil... | {
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"tags": "quantum-mechanics, quantum-information, quantum-optics",
"url": null
} |
quantum-mechanics, measurement-problem, popular-science
So their conclusion is correct but I don't get why they think they have added anything - that is unless somehow saying that some large collection of quantum states that we call a measuring device can form a meta-stable state that then does not collapse when an ob... | {
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"tags": "quantum-mechanics, measurement-problem, popular-science",
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javascript
Title: Create an array of objects from array of arrays I have the following function that creates an array of JSON objects with properties from an array of arrays, where the first 'row' in the array contains the keys.
It works, but could it be improved?
var myArray = [
["a","b","c","d"], // will become... | {
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We next deduce that f is a bijection. Say that an even split E is "neighbor" of
a pair iff the pair contained in one of the parts of E, and is a "neighbor"
of a syntheme iff it corresponds to *none* of the syntheme's component pairs.
Then E is a neighbor of 4 pairs and 4 synthemes. Exercise: these 15+15 = 30
neighbor... | {
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"lm_q2_score": 0.8354835330070839,
"openwebmath_perplexity": 2557.5821634393883,
"openwebmath_score": 0.8611697554588318,
"tags": n... |
temperature, measurements, humidity, data-analysis
You mention Heat Index. According to NOAA, Heat Index
is what the temperature feels like to the human body when relative
humidity is combined with the air temperature...
You might have to prove the relevance of this data to animals which do not react the same w... | {
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"url": null
} |
c++, performance, matrix, sse, simd
That doesn't really address the SSE2 side of the store directly, but you can do the same thing but with separate add/mul. Proper use of AVX would use the wider vectors. For this code that's a fairly trivial change, just make almost everything wider (except the matrix). If AVX is ava... | {
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"tags": "c++, performance, matrix, sse, simd",
"url": null
} |
Equations are (6) and (7) We intend to write time of flight as a function of σ; let be the corresponding function. Horizontal range: The total distance covered by the body in projectile is called horizontal range. , its trajectory equation, we can combine the previous equations to eliminate t , leaving: Equation of Tra... | {
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"lm_q1_score": 0.9893474904166247,
"lm_q1q2_score": 0.8179052450976197,
"lm_q2_score": 0.8267118004748677,
"openwebmath_perplexity": 455.15972771554755,
"openwebmath_score": 0.7767765522003174,
"tag... |
organic-chemistry
As stated in above abstract, $\ce{KI}$ molecule is surrounded by 5 to 6 acetone molecule, instead of 3 in $\ce{NaI}$ case. That makes it crowded (steric effect) as well. Its solubility is reported as 1.330% by weight at $\pu{+25 ^\circ C}$ (Ref.3), compared 29.2% of $\ce{NaI}$ under the same conditio... | {
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"tags": "organic-chemistry",
"url": null
} |
mapping, occupancygrid
Title: Uniform and non-uniform cost maps I can not find a clear answer on the internet about the difference between a uniform and non-uniform cost map. I am interested in getting an answer in the context of grid maps for robot navigation.
EDIT: I found the answer, in my case the uniformity was r... | {
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"tags": "mapping, occupancygrid",
"url": null
} |
ros, navigation, urdf, joints, move-base
Originally posted by Robot on ROS Answers with karma: 180 on 2014-10-02
Post score: 2
Here would be the place to look. It is part of the gazebo_ros_pkgs which you can either apt-get the debian, or download the source for github and compile it yourself. Many gazebo plugin's are... | {
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"tags": "ros, navigation, urdf, joints, move-base",
"url": null
} |
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