text stringlengths 1 1.11k | source dict |
|---|---|
and $$(-1)^{g(n)+1} =(-1)^{n^m+1} =(-1)^{n+1}$$ so $$S =\sum_{n=1}^{\infty} \dfrac{(-1)^{g(n)+1}}{n}u(g(n+1)-g(n)-1) =\sum_{n=1}^{\infty} \dfrac{(-1)^{n+1}}{n} =\ln(2)$$.
β’ @ Marty Cohen +1 Nicely done. Have you seen my last question math.stackexchange.com/q/3457629/198592 ? The minor change makes the problem much mor... | {
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"openwebmath_score": 0.9343695640563965,
"tag... |
huggingface, finetuning, llm, parameter
return forward_call(*args, **kwargs)
File "/srv/home/tester/.local/lib/python3.9/site-packages/transformers/models/gpt2/modeling_gpt2.py", line 889, in forward
outputs = block(
File "/srv/home/seid/miniconda3/lib/python3.9/site-packages/torch/nn/modules/module.py", line ... | {
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"openwebmath_score": null,
"tags": "huggingface, finetuning, llm, parameter",
"url": null
} |
c++, object-oriented, homework, database, inheritance
public:
Song(std::string title, std::string tags);
std::string getTitle() const { return this->_title; }
std::string getTags() const { return this->_tags; }
// Since i had the need in virtual functions and since all virtual functions have to be
... | {
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"tags": "c++, object-oriented, homework, database, inheritance",
"url": null
} |
python, python-3.x, game
print("βββββββββ βββ ββ ββββββ βββββββ βββ ββββββ ββ βββ βββββββ β ββ ββββ β βββββ ββββββ ββββββ ββββ β ")
print("β βββ ββββββ βββββ β ββββ βββββββββ βββ β βββ βββββ ββββ βββ ββ ββββ ββ ββ β βββ βββββ β ββββ βββ ββ ββ β ")
print("β ββββ ββββββ... | {
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"tags": "python, python-3.x, game",
"url": null
} |
This is good enough for my purposes, and I don't have time to focus on this now, However, it might be interesting for future visitors, so the question is how to make it faster by improving/rewriting.
Note: There may be confusion concerning whether I need a matrix populated with primes or one populated only with 0 and ... | {
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"lm_q1_score": 0.9441768635777511,
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"lm_q2_score": 0.8615382112085969,
"openwebmath_perplexity": 5300.123425998542,
"openwebmath_score": 0.3374619483947754,
"tags... |
homework-and-exercises, electrostatics, stability
Hence by the partial derivative test for stability I have a stable equilibrium. A local minimum of potential.
Now starts my confusion. According to what I learnt in Laplace's equation $\Delta V=0$ for potential, in a charge free region(I take the region without charges... | {
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"tags": "homework-and-exercises, electrostatics, stability",
"url": null
} |
c, parsing, unit-testing, rational-numbers
{ "+312 123/235", { 73443, +235 }, 12, 0 },
{ "+312 X", { 312, +1 }, 4, 0 },
{ "+312 123X", { 312, +1 }, 4, 0 },
{ "+312 123/X", { 312, +1 }, 4, 0 },
{ "+312 ... | {
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"tags": "c, parsing, unit-testing, rational-numbers",
"url": null
} |
quantum-mechanics, quantum-entanglement, wavefunction
Title: What does the notation $|x_1,x_2\rangle$ mean? I would like clarification on an equation in the paper "Free matter wave packet teleportation via cold-molecule dynamics", L. Fisch and G. Kurizki, Europhysics Letters 75 (2006), pp. 847-853, DOI: 10.1209/epl/i2... | {
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"tags": "quantum-mechanics, quantum-entanglement, wavefunction",
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} |
c++, vectors
I think it will crash when i = intVector.size() - 1 and you are trying to access intVector[i + 1]. Try looping till i < intVector.size() - 1
Secondly, your second solution works fine when sizeOfIntVector is even and there is nothing to worry about. But when it is odd you are missing one sum to print. So I... | {
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} |
java, performance, array, hash-map
Note that I would highly recommend implementing Iterable in some way in IntArray; you'll also want to see PrimitiveIterator.OfInt
I'm also ignoring the fact that the maximum of an int[] can only ever be an int so there's no reason to autocast it to long, because I'm too tired to thin... | {
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"tags": "java, performance, array, hash-map",
"url": null
} |
ros, object-manipulation, pr2-tabletop-manipulation-apps
Title: PR2 object manipulation hand posture fail: `Hand posture controller timed out`
I have been running the PR2 tabletop manipulation demo from the following link: http://www.ros.org/wiki/pr2_pick_and_place_demos/Tutorials/The%20Pick%20and%20Place%20Autonomou... | {
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"tags": "ros, object-manipulation, pr2-tabletop-manipulation-apps",
"url": null
} |
star, light, supernova, night-sky
Edit: If there is such a star, how did we find out it is already gone? There is an accepted answer already, but there is a couple known cases of a star we know has gone supernova, and yet we can still see it. This source describes one such unique circumstance. The star that exploded h... | {
"domain": "astronomy.stackexchange",
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"tags": "star, light, supernova, night-sky",
"url": null
} |
c++, performance
But really the constructor of Pulse ought to be setting isValid and take the values to use.
while(indA != endA || indB != endB)
{
if(indA == endA)
{
// take the rest of B only
}
else if(indB == endB)
{
// take the rest of A only
... | {
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"tags": "c++, performance",
"url": null
} |
python, vigenere-cipher
But that strategy would fail utterly for short lengths of text due to the costs of setting up the dictionary. It's also possible that all of this would be lost in the noise of using generator expressions. This pontification highlights the need to profile the scenarios for which you actually wan... | {
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"tags": "python, vigenere-cipher",
"url": null
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python, python-3.x, telegram
def show_result(update: Update, context: CallbackContext):
"""Shows result of game to user including the evaluation. Presents options to play again
Args:
update (Update): Telegram Update
context (CallbackContext): Telegram Context
"""
try:
context.u... | {
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{1, 2, 3, ...}, or "Whole Numbers" {0, 1, 2, 3, ...}, depending on the subject. The set of integers is infinite and has no smallest element and no largest element. > is.integer(66L) [1] TRUE > is.integer(66) [1] FALSE Also functions like round will return a declared integer, which is what you are doing with x==round(x)... | {
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"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.986979510652134,
"lm_q1q2_score": 0.8756527542834535,
"lm_q2_score": 0.8872045922259088,
"openwebmath_perplexity": 554.1664265028556,
"openwebmath_score": 0.4758875072002411,
"tags": null,
"... |
image-processing
Title: How unauthorized access is prevented in biometric identification systems biometric access control is a rapidly maturing technology that is used to police our ability to gain access to places, allow us access to software and hardware as well as guard against unauthorized access.
If the number of... | {
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"lm_q2_score": null,
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"tags": "image-processing",
"url": null
} |
evolution, zoology, speculative
Defining a wheel as a freely rotating joint that can rotate indefinitely in one direction, a single animal with a wheel is an improbable* development that would require a single animal have two separate parts (axle/wheel and body).
[*read as: pretty much impossible]
It's hard to imagine... | {
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"openwebmath_score": null,
"tags": "evolution, zoology, speculative",
"url": null
} |
thermodynamics, entropy, chemical-potential
Title: Where did the term with chemical potential go in the first law of thermodynamics? Consider a system that can be defined by
$U$, $V$, ${N}_{i}$ $\left(i=1,2,\ldots k\right)$ and that this system changes from state A to state B via a quasi-static reaction path $C$.
He... | {
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"tags": "thermodynamics, entropy, chemical-potential",
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For us, we have $a_n = a_{n-1} + 2a_{n-2}$ with $a_0 = 0$ and $a_1 = 1$. Then, the characteristic equation is $\alpha^n = \alpha^{n-1} + 2\alpha^{n-2}$, which simplifies to $\alpha^2 = \alpha + 2$. The quadratic solutions give $\alpha_1 = 2$ and $\alpha_2 = -1$. Then, the theorem states that $a_n = k_1 2^n + k_2 (-1)^n... | {
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"lm_q2_score": 0.8333246035907933,
"openwebmath_perplexity": 100.81186822380418,
"openwebmath_score": 0.9641860127449036,
"ta... |
1 , if there is no horizontal line that intersects the graph of the function f at more than one point. R If no horizontal line intersects the graph of the function f in more than one point, then the function is 1 -to- 1 . Explain why a function must be one-to-one in orde⦠Uh oh! Once we have determined that a graph def... | {
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"lm_q1_score": 0.956634196290671,
"lm_q1q2_score": 0.8277029531588749,
"lm_q2_score": 0.865224091265267,
"openwebmath_perplexity": 317.87194996529325,
"openwebmath_score": 0.6791102886199951,
"tags":... |
matlab, digital-communications, spread-spectrum, mimo
suppose I have perfect knowledge channel at receiver side, it means h is known. how can I use MRC for r in order to recover the transmitted signal? Is that possible?
thank you OK, let me explain that for you. First, if you want to understand anything in engineeri... | {
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"tags": "matlab, digital-communications, spread-spectrum, mimo",
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} |
java, reflection, lookup
3) In the second method, you have created a long if-block in cas type is null. I would rather have failed early so the preconditions of the method is shown in the beginning. Also I feel that if the precondition is not met then some logging is needed or better yet an exception would be thrown b... | {
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"tags": "java, reflection, lookup",
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} |
genetics, dna-sequencing, human-genetics, genomics, biotechnology
Yes, it is counted on the haploid genome. I would not make any sense to count it on the diploid genome. When looking at my last paragraph you might see why: Remember, we are looking at (i) fixed differences (both copies of a diploid human genome differ ... | {
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"tags": "genetics, dna-sequencing, human-genetics, genomics, biotechnology",
"url": null
} |
reference-request, hydrogen, fuel
$$\ce{H2 + O2 -> H2O + heat}$$ The equilibrium constant for the reaction $\ce{2H2 + O2 <=> 2H2O}$ is colossal, equal to $\mathrm{2.4 \times 10^{47}}$ at $\mathrm{500\ K}$ (source). This would ensure virtually 100% yield for the combustion of a stoichiometric mixture of oxygen and hyd... | {
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"id": 12814,
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "reference-request, hydrogen, fuel",
"url": null
} |
python, beginner, multithreading, socket, tkinter
def optionMenu(self):#Load in all widgets on option Menu
self.timeStamp = IntVar()
self.hourStamp = IntVar()
self.timeStamp.set(self.optionData["timeStamp"])
self.hourStamp.set(self.optionData["timeSet"])
self.optionWindow = Topl... | {
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "python, beginner, multithreading, socket, tkinter",
"url": null
} |
electrostatics, electric-fields, electric-current, charge
Title: When is the free charge density zero at the boundary of dielectrics It is known that across the interface of two different dielectrics, the electric displacement field must satisfy
$$(\mathbf{D}_2-\mathbf{D}_1)\cdot\mathbf{\hat{n}}=\sigma$$
where $\sigma... | {
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"openwebmath_score": null,
"tags": "electrostatics, electric-fields, electric-current, charge",
"url": null
} |
algorithms, shortest-path, searching, board-games, space-analysis
chessboard.put(Arrays.toString(new int[] { current.x + i, current.y + j }),
new Position(current.x, current.y, depth));
// chessboard.get(current.x + i).set(current.y + j, new Position(curr... | {
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "algorithms, shortest-path, searching, board-games, space-analysis",
"url": null
} |
quantum-mechanics, wavefunction, potential, schroedinger-equation, complex-numbers
Title: Imaginary constant in simplification of the Infinite square well problem I am relatively new to quantum mechanics and I've stumbled upon an issue. Assume that we have an infinite square well that follows this figure:
Now I am try... | {
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"tags": "quantum-mechanics, wavefunction, potential, schroedinger-equation, complex-numbers... |
# Probability a sample mean will fall in a range
1. Nov 21, 2015
### toothpaste666
1. The problem statement, all variables and given/known data
A random sample of size n = 81 is taken from an infinite population with the mean ΞΌ = 128 and the standard deviation Ο = 6.3. With what probability can we assert that the va... | {
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"lm_q1_score": 0.9711290963960278,
"lm_q1q2_score": 0.8660636540140252,
"lm_q2_score": 0.891811044719067,
"openwebmath_perplexity": 621.4102277465222,
"openwebmath_score": 0.7689906358718872,
"tags... |
python, pandas
print(df)
name phone email facebook \
0 Jim Bob NaN jim@email.com Found Social Media
1 Joe Bloggs 35543256 NaN Found Social Media
foursquare instagram linkedin skype \
0 Found Social Media Found Social... | {
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"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "python, pandas",
"url": null
} |
python, python-2.x, role-playing-game
def dead():
os.system('clear')
print "You have died"
option = raw_input(' ')
def store():
os.system('clear')
print "Welcome to the shop!"
print "\nWhat would you like to buy?\n"
print "1.) Great Sword"
print "back"
print " "
option = raw_in... | {
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"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "python, python-2.x, role-playing-game",
"url": null
} |
Jan
16
## how to graph a horizontal stretch | {
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"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9674102552339746,
"lm_q1q2_score": 0.8316475213397186,
"lm_q2_score": 0.8596637433190939,
"openwebmath_perplexity": 934.7193425999545,
"openwebmath_score": 0.5774544477462769,
"tags": n... |
neural-networks, reinforcement-learning, deep-learning, deep-rl, dqn
Title: When using (s,a,r,s') to train networks could the Q network be adjusting to a suboptimal r? My question here is that whenever you take an experience from the experience buffer (s,a,r,s') and you input r into r+yMAXQ(s',a') to get the loss. Wha... | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "neural-networks, reinforcement-learning, deep-learning, deep-rl, dqn",
"url": null
} |
beginner, php, object-oriented, json, finance
$index_sector_file = $index_sector_dir . self::getCurrentTime() . ConfigConstants::EXTENSION_JSON;
$index_sector_json = json_encode($front_index_data, JSON_FORCE_OBJECT);
$file_handle = fopen($index_sector_file, "a+");
fwrite($file_handle, $index_s... | {
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "beginner, php, object-oriented, json, finance",
"url": null
} |
newtonian-gravity, work, potential-energy, conventions
A comparison
It's been pointed out that an answer to another, similar question says that $\mathrm{d}\vec{r}$ is not a vector directed along the path. After looking into it, I believe that's not correct, for a similar reason to what you did here: that answer uses t... | {
"domain": "physics.stackexchange",
"id": 68628,
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"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "newtonian-gravity, work, potential-energy, conventions",
"url": null
} |
thermodynamics, statistical-mechanics, entropy, probability
\text{so}\quad x_1+x_2=1
$$
and also define $v_1=V_1/A_1$ and $v_2=V_2/A_2$. Notice that
$$
\frac{V_1+V_2}{A_1+A_2} = x_1v_1 + x_2v_2 .
$$
Then
$$
\Delta S_A/k = (A_1+A_2) \ln \left(\frac{x_1v_1+x_2v_2}{v_1^{x_1}v_2^{x_2}}\right) .
$$
This is guaranteed to be... | {
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"tags": "thermodynamics, statistical-mechanics, entropy, probability",
"url": null
} |
python, python-3.x, python-requests
import requests
token = input('Please enter your bearer authentication token: ')
sandbox = input('Please enter your sandbox ID: ')
headers = {
"Accept": "application/yang-data+json",
"Content-Type": "application/yang-data+json",
"Authorization": "Bearer " + token,
}
t... | {
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"openwebmath_score": null,
"tags": "python, python-3.x, python-requests",
"url": null
} |
c#, design-patterns, .net
Title: Validation Error Handling - DRY Pattern Implementation The Country, State and City functions accepts the Integer as Parameter and returns the relevant error code if the validation fails in ValidateNotExist Class.
Therefore, I have enhanced the ValidateNotExist class with a slight diffe... | {
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"tags": "c#, design-patterns, .net",
"url": null
} |
thermodynamics, phase-transition
The transition from liquid to solid when the temperature is rising is equivalent to the enthalpy of fusion being negative.
To explain this behaviour one must turn to quantum mechanics.
It would seem that during that transition one goes from a less disordered liquid to a more disordere... | {
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"tags": "thermodynamics, phase-transition",
"url": null
} |
javascript, jquery, optimization, html5
function changeSelected(index) {
$('.selected').removeClass('selected');
$slides.eq(index).addClass('selected'); //Use previously selected object
}
});
Here's a link to the doc for .size() where you can find it is deprecated. | {
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"tags": "javascript, jquery, optimization, html5",
"url": null
} |
rviz, ros3djs, collada, dae, stl
Title: ros3djs not able to display my 3D files
Hello! I've built a part in solidworks and exported it into a STL file. So I'm trying to display it on the web browser through the package ros3djs (http://wiki.ros.org/ros3djs/Tutorials/VisualizingAURDF). When I try to show it, the web co... | {
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"tags": "rviz, ros3djs, collada, dae, stl",
"url": null
} |
general-relativity, gravity, gravitational-waves
Also the earth and the moon do not seem to lose any mass, but they also produce tiny gravitational waves.
Is my assumption that no rest mass, only relativistic mass, so velocity is converted to gravitational waves correct, or am I overlooking something? If so, what is t... | {
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"url": null
} |
With this background the proof becomes straightforward.
We will try to simplify the left hand side of $\Ref{0}$ to reach the right hand side. And the shape of the LHS suggests to use definition $\Ref{1s}$, and therefore we investigate the upper bounds of the LHS. For any $\;c\;$, $$\calc \sup(\{b \mid \langle \forall ... | {
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"openwebmath_score": 0.9940326809883118,
"tags... |
the limit as k ->inf of the area of the largest sub-rectangle of the partition (where k is number of partitions) goes to. Students will receive the complete AP Calculus BC course as well as several topics that are not covered in the course description. Calculus - Everything you need to know about calculus is on this pa... | {
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"id": null,
"lm_label": "1. YES\n2. YES\n\n",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9802808753491773,
"lm_q1q2_score": 0.8059762805706365,
"lm_q2_score": 0.8221891305219504,
"openwebmath_perplexity": 797.4507241697992,
"openwebmath_score": 0.648494005203247... |
machine-learning, clustering, unsupervised-learning
Title: How to identify clusters after multiple runs? Suppose I run an unsupervised clustering algorithm. After multiple runs, I find clusters and would like to know if the same cluster was found more than once.
For example:
I can figure out A-orange, B-green and C-b... | {
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"tags": "machine-learning, clustering, unsupervised-learning",
"url": null
} |
quantum-mechanics, wavefunction, quantum-entanglement, bose-einstein-condensate
I understand that entangled particles can be described by the same wavefunction too.
So in both cases the particles can be described by the same wavefunction.
Question:
Is BEC the same as entanglement for a larger (macroscale) number of p... | {
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"tags": "quantum-mechanics, wavefunction, quantum-entanglement, bose-einstein-condensate",
... |
python, optimization
# define a totaltimescale in picoseconds - the minus 1 is
# because of the zero index
# windowsize is 2 ns
totaltimescale = 50000 - 1
windowsize = 2000
# endtau should take into consideration the multiplier
# below so 400 with a multiplier of 5 gives us
endtau = 400
alltau = range(1, endtau)
... | {
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"tags": "python, optimization",
"url": null
} |
newtonian-mechanics, forces, experimental-physics, thought-experiment
The previous question discusses the necessity of the centre of mass being fixed, but no one is pointing out what force is responsible. That is what I am asking here. Unless if the ions have a temperature of 0, they have random thermal velocities. So... | {
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"tags": "newtonian-mechanics, forces, experimental-physics, thought-experiment",
"url": n... |
java, collections, stream
Title: Intersection of a Stream of Collections An API (I have no control over) gives me a bunch of Collections (Lists, to be precise,) and I need the elements that are common to all of them. In this concrete case, I'm trying to find Selenium WebElements that match several selectors. But I wen... | {
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"tags": "java, collections, stream",
"url": null
} |
β’ The equation $QQ^T = I$ only holds if the columns of $Q$ form an orthonormal set of vectors, not merely an orthogonal one. After all, some columns might be equal to $0$! Jul 20, 2011 at 18:38
β’ Oh thanks for highlighting this! But still, if the columns are orthonormal and are unit vectors, why are its rows so coincid... | {
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"openwebmath_score": 0.9142773151397705,
"tag... |
gazebo
Title: openai_ros + noetic + turtlebot2 :: start_training.launch gives "No suscribers to cmd_vel_pub" error
EDITED
I followed the tutorial "OpenAI_ROS with Turtlebot2 Step by Step #Part 1" from The Construct, but in my local pc. I have everything running but start_training.launch is giving an error
No suscribe... | {
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"tags": "gazebo",
"url": null
} |
type-safety, dxl
My concern is that in DXL parenthesis are not mandatory: as you can see in the example, casting key(numberCache) can be simplified in key numberCache. When declaring the first three strings, the only thing preventing the whole code to blow up seems to be the comma. Please ignore for now the fact that ... | {
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"tags": "type-safety, dxl",
"url": null
} |
Staff - 3Β years, 1Β month ago
So you are saying that the factorial of fraction should be possible but this can not be possible according to the definition of it. And hence the derivation is correct.
- 3Β years, 1Β month ago
We can take the factorial of fractions, and or irrational numbers. The definition of it is not $... | {
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"openwebmath_score": 0.9997036457061768,
"tags... |
c#, wpf
<Rectangle Grid.Column="2" Grid.Row="1" Grid.ColumnSpan="2" Grid.RowSpan="1" Fill="Yellow"/>
</Grid>
<Viewbox >
<Canvas Width="200" Height="200">
<Rectangle Canvas.Top="10" Canvas.Left="30" Width="60" Height="30" Fill="Aqua" />
<Rectangle Canvas.Top="... | {
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"url": null
} |
waves, simulations, boundary-conditions
For the Navier-Stokes equations, this is done by taking the 1D form of the governing equation (normal to the boundary). The system of variables is then recast into the symmeterizing variables (ie. variables are chosen such that the transformed system is symmetric). This gives a ... | {
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"tags": "waves, simulations, boundary-conditions",
"url": null
} |
java, object-oriented, swing, graphics
Am I instantiating more than I need to?
There's no particular excess here, although this may not be the most efficient method you could have come up with. Unless you were under specific direction from a higher authority not to use certain constructs, such as BufferedImages, this... | {
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"tags": "java, object-oriented, swing, graphics",
"url": null
} |
homework-and-exercises, special-relativity, kinematics, spacetime, differentiation
I don't know how to derive these two formulas:
$$t=\frac{c}{a'}\sinh{(\frac{a't'}{c})}$$
$$T=\frac{c}{a'}\sinh^{-1}{\frac{a't}{c}}$$ Note: I ll use another name for the velocities because I could not understand yours.
How does constant... | {
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"tags": "homework-and-exercises, special-relativity, kinematics, spacetime, differentiation... |
c#, stream
/// <summary>
/// Reads bytes from the stream. Bytes will be returned in the output encoding specified, regardless of the input encoding
/// </summary>
/// <param name="buffer">Buffer to fill</param>
/// <param name="offset">Start position in the buffer</param>
/// <param name="count">C... | {
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"openwebmath_score": null,
"tags": "c#, stream",
"url": null
} |
organic-chemistry, aromatic-compounds, molecular-orbital-theory, tautomer
When I originally wrote the question, I made a mistake while counting the thiol tautomer pi electrons on the resonance form of the right. I originally counted 6pi $\ce{e-}$, but it actually has 8pi $\ce{e-}$ (4 from the carbon-carbon pi-bonds, 2... | {
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"tags": "organic-chemistry, aromatic-compounds, molecular-orbital-theory, tautomer",
"ur... |
in tone, and contain many worked examples and warnings about problem areas and probable "trick" questions. A good understanding of algebra is required to succeed at the other mathematics. Graphing Stories: Short video stories that help students learn to graph on a plane. Then practice what you have learned. Review of L... | {
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"openwebmath_perplexity": 524.9600959979937,
"openwebmath_score": 0.6085191369056702,
... |
ros2
root@ubuntu:/home/priyam# curl -s https://raw.githubusercontent.com/ros/rosdistro/master/ros.asc | sudo apt-key add -
OK
root@ubuntu:/home/priyam# sudo sh -c 'echo "deb [arch=$(dpkg --print-architecture)] http://packages.ros.org/ros2/ubuntu $(lsb_release -cs) main" > /etc/apt/sources.list.d/ros2-latest.list'
roo... | {
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"id": 35870,
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"openwebmath_score": null,
"tags": "ros2",
"url": null
} |
java, design-patterns, mvc, swing
{ public JDialog window;
public JPanel contentPane = new JPanel();
public JLabel lablelIDValue = new JLabel();
public JLabel labelFirstName = new JLabel();
public JTextField textFieldFirstName = new JTextField();
public JLabel labelLastName = new JLabel();
p... | {
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"tags": "java, design-patterns, mvc, swing",
"url": null
} |
nodelet, transform
Originally posted by torstenfiolka with karma: 16 on 2012-09-17
This answer was ACCEPTED on the original site
Post score: 0 | {
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machine-learning, neural-network, deep-learning, classification, image-classification
path = "/content/drive/My Drive/Colab Notebooks/Train"
dirs = os.listdir( path )
def resize():
for item in dirs:
if os.path.isfile(path+item):
im = Image.open(path+item)
f, e = os.path.splitext(pa... | {
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"id": 6419,
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"tags": "machine-learning, neural-network, deep-learning, classification, image-classifi... |
organic-chemistry, reaction-mechanism, aromatic-compounds, amines, heterocyclic-compounds
Intramolecular cyclization to produce a triazole will only occur if the amino groups in the starting diamine are ortho to one another. If m- or p-phenylenediamines or non-ortho naphthyl diamines are used, then products resulting... | {
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"tags": "organic-chemistry, reaction-mechanism, aromatic-compounds, amines, heterocyclic-c... |
python, algorithm, python-3.x
It is impossible to know whether the 12.3 MB is a lot or a little without knowing what this includes and how big the test cases were, neither of which LeetCode tells us.
1. Review
I found it difficult to follow the algorithm because of the proliferation of similarly named variables. Ther... | {
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"tags": "python, algorithm, python-3.x",
"url": null
} |
c++, tic-tac-toe, c++14
If the Player member functions need access to the board, then pass a reference to the board as needed. For example:
p1.move(board)
Use include guards
There should be an include guard in each .h file. That is, start the file with:
#ifndef BOARD_H
#define BOARD_H
// file contents go here
#endi... | {
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} |
All approaches are acceptable if they find fractal dimension from any image of natural fractal.
β’ You have a lot of programs in mathematica to measure fractal dimensions and multi fractal spectrum of an image in the book: Fractal Geography, Andre Dauphine, Wiley, 2012 See the book on the Wolfram Mathematica | Books or... | {
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"openwebmath_score": 0.49823832511901855,
"ta... |
a long hollow cylinder with L = 0. Consider an in nitely long solid non-conducting cylinder of radius R with uniform charge density Λ > 0. Since this is meant to be a learning exercise, instead of completely answering the question, I'll leave you with some ways to start thinking about the problem. 00 cm carries a unifo... | {
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"lm_q1q2_score": 0.823734579200424,
"lm_q2_score": 0.8333246015211008,
"openwebmath_perplexity": 429.7929339172226,
"openwebmath_score": 0.8591949939727783,
"tags": null... |
reference-request, pl.programming-languages, time-complexity, compilers, program-analysis
Because of halting problem issues, and since one can have programs that work by dovetailing, for example Levin's algorithm for SAT that runs in polynomial time iff P=NP, I suspect that one may have to design the programming langu... | {
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"tags": "reference-request, pl.programming-languages, time-complexity, compilers, program-a... |
c++, multithreading, concurrency, queue, producer-consumer
Producers can still overwrite data a consumer is working on
You still have the same problem as in the first iteration of your code. Again, simplifying your push() and pop() function:
push(const T& in_data)
{
auto produced_cursor = claim_cursor_for_push();
... | {
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"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "c++, multithreading, concurrency, queue, producer-consumer",
"url": null
} |
java, performance, linked-list, reinventing-the-wheel, stack
while(currentNode!=null){
if(currentNode.getData().equals(toFind))
return currentNode;
else if(currentNode.getNextNode()!=null) {
if (currentNode.getNextNode().getData().equals(toFind... | {
"domain": "codereview.stackexchange",
"id": 20331,
"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, performance, linked-list, reinventing-the-wheel, stack",
"url": null
} |
general-relativity, gravity, dark-matter, modified-gravity
Title: Why dark matter and general relativity? My knowledge on this subject is minimal, so sorry if my question is obvious. But why is the current consensus that there is something called dark matter rather than that our current theory of gravity (general rela... | {
"domain": "physics.stackexchange",
"id": 20966,
"lm_label": null,
"lm_name": null,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "general-relativity, gravity, dark-matter, modified-gravity",
"url": null
} |
Generally speaking, there's no particular relationship between the eigenvalues of two matrices and the eigenvalues of their sum. The eigenvalues of a skew-symmetric matrix always come in pairs Β±Ξ» (except in the odd-dimensional case where there is an additional unpaired 0 eigenvalue). Taking the n eigenvectors as basis,... | {
"domain": "forret.com",
"id": null,
"lm_label": "1. YES\n2. YES\n\n",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9632305307578324,
"lm_q1q2_score": 0.8088573876496202,
"lm_q2_score": 0.8397339596505965,
"openwebmath_perplexity": 660.5278213635348,
"openwebmath_score": 0.8692973256111145,
"tags":... |
homework-and-exercises, newtonian-mechanics, work
So, why is equation (1) not applicable in this case? As I cannot comment (min 50 reputation) I will write it as the answer,
All the equations framed for conservation of energy, momentum were correct.
The point where you were wrong was that you assumed the result is ind... | {
"domain": "physics.stackexchange",
"id": 39505,
"lm_label": null,
"lm_name": null,
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"openwebmath_score": null,
"tags": "homework-and-exercises, newtonian-mechanics, work",
"url": null
} |
javascript, game
logic.activeObjects = (objects) => {
const isActive = (object) => object.position.y < logic.constants.mapHeight;
return objects.filter(isActive);
};
logic.VerticalRelativitySystem = class {
static relativeTo({object, verticalSpeed}) {
return new logic.Verti... | {
"domain": "codereview.stackexchange",
"id": 26481,
"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, game",
"url": null
} |
2. The Pythagoras Theorem. B z uACl_lG XruiZgehatysf IrleasaeWrMvsevdG. NYS COMMON CORE MATHEMATICS CURRICULUM. collection of geometry formulas. P ostulates, Theorems, and Corollaries R2 Postulates, Theorems, and Corollaries Theorem 2. Understand congruence in terms of rigid motions. S and T are points on the circumfer... | {
"domain": "lotoblu.it",
"id": null,
"lm_label": "1. YES\n2. YES\n\n",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9848109516378093,
"lm_q1q2_score": 0.8141548265466336,
"lm_q2_score": 0.826711791935942,
"openwebmath_perplexity": 1097.5482735592198,
"openwebmath_score": 0.4311477541923523,
"tags":... |
digital-communications, lte
And similarly in more compact form with the wide data paths representing complex waveforms (where each wide trace below is a complex data path as $I+jQ$): | {
"domain": "dsp.stackexchange",
"id": 12410,
"lm_label": null,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "digital-communications, lte",
"url": null
} |
python, mathematics, numpy, vectorization
Title: Vectorizing in Python I have the following code:
for j in range(rows):
for i in range(cols):
k = j * rows + i
k1 = k + 1 if i < cols - 1 else k - 1
k2 = k - 1 if i > 0 else k + 1
k3 = k + cols if j < rows - 1 else k - cols
k4... | {
"domain": "codereview.stackexchange",
"id": 14256,
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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": "python, mathematics, numpy, vectorization",
"url": null
} |
quantum-field-theory, operators, commutator, dirac-equation
Title: How to take hermitian conjugate of an operator containing multiple elements? The annihilation operator in the Dirac field could be written as
$$
a_p^s = \frac{e^{iE_pt}}{\sqrt{2E_p}}u^s(p)^\dagger\int d^3xe^{-ipx}\psi(t,x)
$$
Where
\begin{equation*}
\b... | {
"domain": "physics.stackexchange",
"id": 92665,
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"lm_name": null,
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "quantum-field-theory, operators, commutator, dirac-equation",
"url": null
} |
quantum-mechanics, energy, angular-momentum, wavefunction, schroedinger-equation
Essentially,
It can be proven that the ground state must be real and non-negative everywhere, assuming a bound state exists and assuming zero spin. The argument in the paper is abstract, but the idea is that, after making the wavefuncti... | {
"domain": "physics.stackexchange",
"id": 17659,
"lm_label": null,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "quantum-mechanics, energy, angular-momentum, wavefunction, schroedinger-equation",... |
quantum-field-theory, lagrangian-formalism, renormalization, dimensional-analysis, interactions
24:30 Dimensional analysis of mass dimension $[\cdot]$ in absolute units $\hbar=1=c$:
$$\begin{align} [\phi]~\stackrel{(1)}{=}~&\frac{D-2}{2}, \cr
[\lambda]~\stackrel{(1)}{=}~&D-n[\phi] ~=~(1-\frac{n}{2})D+n .\end{align}\t... | {
"domain": "physics.stackexchange",
"id": 79880,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "quantum-field-theory, lagrangian-formalism, renormalization, dimensional-analysis,... |
javascript, node.js, selenium, webdriver
Page.checkCssValue = function (el, cssValue, value){
//find function, the '0' represents the iframe index
var newEl = this.find(el, 0);
return newEl.getCssValue(cssValue).then(function(result){
if(result !== value){
console.log(result + " and " +... | {
"domain": "codereview.stackexchange",
"id": 24000,
"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, node.js, selenium, webdriver",
"url": null
} |
c++, matrix, c++14, template, vectors
Simply return the value of the expression.
template<typename T>
LiteMatrix<T> LiteMatrix<T>::operator+(const LiteMatrix& rhs)
{
// Simpler to write as:
return LiteMatrix(*this) += rhs;
}
Yes this works:
template<typename T>
T& LiteMatrix<T>::operator()(const size_t& rInde... | {
"domain": "codereview.stackexchange",
"id": 33082,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "c++, matrix, c++14, template, vectors",
"url": null
} |
organic-chemistry, aromatic-compounds
For instance, I believe bicyclo[3.1.0]hexa-1,3,5-triene should follow all of the previous conditions except possibly the last (but I don't know that it hasn't). Do any chemicals obey all of these conditions?
There is this compound which is I believe the closest to anything which ... | {
"domain": "chemistry.stackexchange",
"id": 10022,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "organic-chemistry, aromatic-compounds",
"url": null
} |
purification, food-chemistry
An impurity of 1% is already quite small, and that 1% comprises a variety of compounds, both organic and inorganic (the overwhelming bulk of which are likely not harmala alkaloids, given the natural composition of caffeine-containing plant sources I described above). Based on the above inf... | {
"domain": "chemistry.stackexchange",
"id": 541,
"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": "purification, food-chemistry",
"url": null
} |
string-theory, research-level, compactification
Title: Scherk-Schwarz and other compactifications? I have been thinking about various types of compactifications and have been wondering if I have been understanding them, and how they all fit together, correctly.
From my understanding, if we want to compactify spacetim... | {
"domain": "physics.stackexchange",
"id": 3335,
"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": "string-theory, research-level, compactification",
"url": null
} |
ros, python, ros-kinetic, script, roscore
2- Trying the same code with shell=True option,
roscore = subprocess.Popen('roscore', shell=True)
gives the output:
runfile('/opt/ros/kinetic/bin/run_roscore.py', wdir='/opt/ros/kinetic/bin')
/bin/sh: 1: roscore: not found
3- I also tired other libaries: os and commands
impo... | {
"domain": "robotics.stackexchange",
"id": 31253,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "ros, python, ros-kinetic, script, roscore",
"url": null
} |
javascript, beginner, programming-challenge
console.log(arrayStrNumber);
// Do math operation with order +-*/
var finalResult = 0;
for (var i = 0; i < arrayStrNumber.length; i++) {
arrayStrNumber[i] = parseInt(arrayStrNumber[i].slice(1));
if (i === 0) {
finalResult += arrayStrNumber[i];
continue;
}
if ... | {
"domain": "codereview.stackexchange",
"id": 38281,
"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, beginner, programming-challenge",
"url": null
} |
a closed-form numerical solution you can use vertices that is isomorphic to its own complement 2021! Shown in Fig research on the number of edges based on a set independent! Figure 10: two isomorphic graphs a and B and a non-isomorphic graph C ; each four! Presented for the structural synthesis of multi-DOF PGTs is ver... | {
"domain": "jitsurei.net",
"id": null,
"lm_label": "1. Yes\n2. Yes\n\n",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9770226341042414,
"lm_q1q2_score": 0.8652819865476615,
"lm_q2_score": 0.8856314647623016,
"openwebmath_perplexity": 793.8879132984248,
"openwebmath_score": 0.4210825562477112,
"tags... |
waves, acoustics, speed
We also have to start considering more complete models when dealing with very loud sounds. Once a sound gets above 196dB, you cannot use the nice simple ideal wave propagation formulas because the low-pressure side of the wave is so low that you get a 0atm vacuum. Modeling this correctly requ... | {
"domain": "physics.stackexchange",
"id": 32232,
"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": "waves, acoustics, speed",
"url": null
} |
ros
Title: unmet dependencies when simulating the installation of ros-kinetic-desktop?
I am working on OS- 64 bit Ubuntu 16.04 ( LTS ) architecture - ARM64 , and trying to simulate installation of ros-kinetic-desktop using
sudo apt-get install -s ros-kinetic-desktop
However, I am ending up with the error
The follow... | {
"domain": "robotics.stackexchange",
"id": 27140,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "ros",
"url": null
} |
automata
| y >= 100 +---------------------+
+------------------------------------->| 0.98 <= x' <= 0.99 |
| y' = 0 |
+---------------------+ | {
"domain": "cs.stackexchange",
"id": 11604,
"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": "automata",
"url": null
} |
the average of the night ( approx 's formula ; law the. Least twice at a minimum black points, called Rolle β s theorem theorems.By mean we understand average....Kastatic.Org and *.kasandbox.org are unblocked Sharpie mean value theorem is one the... Of Solutions of Simultaneous Linear Equations ( II ) in Two Unknowns n... | {
"domain": "truongphatsafety.com",
"id": null,
"lm_label": "1. YES\n2. YES\n\n",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9688561667674653,
"lm_q1q2_score": 0.8273186311757473,
"lm_q2_score": 0.853912747375134,
"openwebmath_perplexity": 419.0139443976686,
"openwebmath_score": 0.7743996977806091,
... |
powershell, active-directory
So, depending on how accurate you really need this process to be, you might avoid querying all the DCs in the first place and just take LastLogonDate as being "Close Enough" for your purposes. It would simplify things greatly if that's acceptable.
The thing is, this also reveals a problem ... | {
"domain": "codereview.stackexchange",
"id": 18660,
"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": "powershell, active-directory",
"url": null
} |
c#, wpf, async-await, observer-pattern
public class ObservableTaskQueue : INotifyPropertyChanged
{
public event Action StartWorking;
public event Action StopWorking;
public event PropertyChangedEventHandler PropertyChanged; | {
"domain": "codereview.stackexchange",
"id": 23145,
"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#, wpf, async-await, observer-pattern",
"url": null
} |
gazebo, roslaunch, sdf, parameters, xacro
Node(package='tuw_gazebo_models',
name="publisher_robot",
executable='spawn_robot.py',
arguments=[LaunchConfiguration('robot_desc')],
parameters=[{
"X": LaunchConfiguration('X'),
"Y": LaunchConf... | {
"domain": "robotics.stackexchange",
"id": 37868,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "gazebo, roslaunch, sdf, parameters, xacro",
"url": null
} |
An ideal $I$ is a prime ideal in a ring $R$ iff its quotient $R / I$ is an integral domain.
For the principal ideal, euclidean and integral domain $\mathbb{Z}$ the equivalence of prime numbers $p$ and the above definition of prime ideals is obviously true: $\mathbb{Z}_p$ is even a field and $p\mathbb{Z}$ prime and max... | {
"domain": "physicsforums.com",
"id": null,
"lm_label": "1. YES\n2. YES\n\n",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9653811571768047,
"lm_q1q2_score": 0.8262225706303484,
"lm_q2_score": 0.8558511469672594,
"openwebmath_perplexity": 405.7668821629803,
"openwebmath_score": 0.8702592253684998,
... |
measurement, bell-basis
but this holds only when the eigenvalues are distinct. If the eigenvalues are non-distinct as in this case (there are total 4
eigenvalues but only 2 distinct eigenvalues), the wavefunction will collapse to a superposition of the associated eigenvectors. This is not mentioned in any of the textb... | {
"domain": "quantumcomputing.stackexchange",
"id": 2849,
"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": "measurement, bell-basis",
"url": null
} |
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