text stringlengths 1 1.11k | source dict |
|---|---|
ros
Okay so the package 'joy' which is missing is to interface a joystick, which I don't think I'd be using. It said "Built 15 package with 1 failures."
Can I just proceed and ignore the failure since I don't need the the joy package anyways?
How do I check if the 15 packages are built?
If I just go into the manifest ... | {
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17Calculus - Double Integrals in Polar Coordinates
Using Vectors
Applications
Partial Integrals
Double Integrals - 2Int
Triple Integrals - 3Int
Practice
Articles
As you learned on the polar coordinates page, you use the equations $$x=r\cos\theta$$ and $$y=r\sin\theta$$ to convert equations from rectangular to p... | {
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"openwebmath_score": 0.770862340927124,
"tags": null... |
fluid-dynamics, convection
Given the crudity of the model there is no point in solving the above problem exactly. From the link I have given previously, $L_{ocean}\sim 100~ m$ and $u_{rms,ocean}\sim 1~m/s$ , which means $\alpha_{ocean}\sim 100~ m^2/s$. I don't know what $\alpha_{fluid}$ will be for fluid inside the tu... | {
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"tags": "fluid-dynamics, convection",
"url": null
} |
javascript, programming-challenge, array
if ((!(arr.length)) || ((containsStrings(arr)))) return '';
arr = arr.filter(function(e, i, a){
if (typeof e == 'string') {
return e;
}
});
shortestWord = arr.reduce(function(prev, next) {
if (prev.length < next.length) {
return prev;
... | {
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"tags": "javascript, programming-challenge, array",
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ros, slam, navigation, moveit, rplidar
Originally posted by w on ROS Answers with karma: 99 on 2017-03-16
Post score: 0
The title confused me, so you are not finding drivers for rplidar because they have built everything for you.
Instead, you want a driver for L298? Or, a differential PD control for the motor drive?
... | {
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"tags": "ros, slam, navigation, moveit, rplidar",
"url": null
} |
is equilateral, For an equiangular triangle has three congruent angles that meansure. That all three sides and equiangular Three-Sided Polygons ( triangles ) because of how and... Is simply a specific case of … equiangular and equilateral triangles are also equal the only value is. Is isosceles, equilateral, and it is ... | {
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"openwebmath_score": 0.5857572555541992,
"tags": n... |
c#
// Get MAC address of associated IP address
var macAddress = NetworkInterface.GetAllNetworkInterfaces()
.Where(e => e.OperationalStatus.Equals(OperationalStatus.Up))
.Where(e => e.GetIPProperties().UnicastAddresses
.Where(a => a.Address.AddressFamily.Equals(AddressFamily.InterNetwork) &&
a.Addre... | {
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"tags": "c#",
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} |
organic-chemistry, reaction-mechanism
Title: Ammonia to tri substituted nitrogen I am told that an intramolecular proton abstraction can occur. For some reason this seems at least sterically unlikely. Is it possible sterically? Or is the proton abstraction best described as a equilibrium process between the nitrogen's... | {
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"tags": "organic-chemistry, reaction-mechanism",
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particle-physics, laser
There are 2 lenses in the photo above, a focal lens where fl=50mm and another focal lens where fl=25mm. The one that is directly after the laser beam is the 50mm focal lens which focuses the beam but its true purpose is then expand the beam diameter to about 1cm. The beam shines through a hole ... | {
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"tags": "particle-physics, laser",
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• Just to state explicitly, you will always get at least 35 cents if you have at least 1 quarter, and you will never get at least 35 cents if you have less than 1 quarter. This is the reason the problem splits into only two possibilities. If there was, for example, 1 penny, then you could draw 1 quarter, 1 penny, 1 nic... | {
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"lm_q2_score": 0.8175744717487329,
"openwebmath_perplexity": 142.42711857643133,
"openwebmath_score": 0.8649442791938782,
"ta... |
python, beginner, json, api, unit-conversion
# if user has specified desired currency
if output_cur != '':
response_url = "http://api.fixer.io/latest?base={}&symbols={}".format(input_cur, output_cur)
response = requests.get(response_url)
# checking for validity of inputs
... | {
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"url": null
} |
beginner, rust, wordle
#[cfg(test)]
mod apply_learning_tests {
use super::*;
#[test]
fn empty_knowledge_correct_letter_added_to_list_of_correct_letters() {
let knowledge = build_empty_knowledge();
let response = GuessResponse {
letter_responses: [
LetterResponse... | {
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"tags": "beginner, rust, wordle",
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vision, cognition, cat
Having a bit of background in biology I tried to map this to a more "scientific" explanation but wasn't successful so far. How would you describe the cognitve perception of vehicles by big cats (or lions specifically)? It's basically the same as humans, they include higher predatory association... | {
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From this graphic, it’s easy to see the (3^3) = 27 arrangements of success.
GA
--. .-
GingerAle Jan 20, 2022
edited by GingerAle Jan 20, 2022
edited by GingerAle Jan 20, 2022
#11
+2403
0
That is a very cool way to visualize the problem.
One thing I love about math is how many different ways there are to solve t... | {
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"tags": null,
... |
was related to a vocabulary quiz which was being circulated around the web. SageMath is a free open-source mathematics software system licensed under the GPL. Subclasses of Function should define a class method eval, which returns a canonical form of the function application (usually an instance of some other class, i.... | {
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"lm_q2_score": 0.8438951005915208,
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"openwebmath_score": 0.4872167706489563,
"tags":... |
50 times. ) On a fair coin, each side has an equal probability of coming up. 8) for i in xrange(10)] [H,H,T,H,H,H,T,H,H,H]. The probability of landing on heads (success) is 0. If the coin is tossed 3 times, what is the probability that at least one of the tosses will turn up tails? 0. org Now if you want to know the pr... | {
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"lm_q2_score": 0.8198933359135361,
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"openwebmath_score": 0.7294924855232239,
"tag... |
inorganic-chemistry, boron-family
Which one is a better explanation? To say that boron forms only covalent compounds is an oversimplification. It can be involved in metallic or even predominantly ionic bonding, especially when combined with elecyropositive elements like magnesium. Compounds such as magnesium diboride ... | {
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"tags": "inorganic-chemistry, boron-family",
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condensed-matter, solid-state-physics, molecules, vibrations
Now, as to what exactly is vibrating, the quick answer is the nuclei, but there are some subtleties involved through the Born-Oppenheimer approximation. The degrees of freedom that are involved are exactly the spatial coordinates of all the $N$ nuclei in the... | {
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"tags": "condensed-matter, solid-state-physics, molecules, vibrations",
"url": null
} |
newtonian-mechanics, rotational-dynamics, angular-momentum, torque, rigid-body-dynamics
$$\sum_{i} \frac{dL_i}{dt}=\sum_{i} r_{i}\times F_{ext,i}$$
Where $F_{ext,i}$ is the net external force on the $i^{th}$ particle since the internal forces cancell out.
But that is the net external torque on the $i^{th}$ particle. H... | {
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"tags": "newtonian-mechanics, rotational-dynamics, angular-momentum, torque, rigid-body-dyn... |
electromagnetism, electrostatics, electric-fields, maxwell-equations, dielectric
$$S_\text{eq} = S_1 + S_2 + ...
$$
Moreover, the elastance of a pair of parallel plates is proportional to the distance between them:
$$
S = \frac{d}{\kappa \epsilon_0 A}
$$
These two properties make it straightforward to imagine subdivi... | {
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"tags": "electromagnetism, electrostatics, electric-fields, maxwell-equations, dielectric",... |
fluid-dynamics, fluid-statics
s Second Law of Motion}\tag{II}$$
where
$\begin{align}\textrm{acceleration} \equiv \dot{\mathbf v}(x,y,z,t) & = v_x ~\partial_x\mathbf v + v_y ~\partial_y \mathbf v + v_z~\partial_ z \mathbf v + \partial_t \mathbf v \\ & = (\mathbf v\cdot\nabla) ~\mathbf v + \partial_t \mathbf v\tag{II... | {
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"tags": "fluid-dynamics, fluid-statics",
"url": null
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elements
Could Carbon 14 have been created before the Big Bang or did it only get created after the making of the world? Or something else all together?
Just curious, and want to learn. Thanks for helping me understand. NO Near the big bang temperatures were high enough that nuclei were not important. The binding en... | {
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"tags": "elements",
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time-complexity, recurrence-relation
my attempt was to produce a recurrence relation broken into cases:
if $n \leq 1$ then :
$T(n)=\theta(1)$
if $n $ is odd then the for loop is executed $n$ times and we return a problem of size $n-1$ so :
$T(n)= T(n-1) + \theta(n)$
if $n$ is even then the inner while loop is execu... | {
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"tags": "time-complexity, recurrence-relation",
"url": null
} |
bacteriology, mutations
Title: Are efflux pumps mutations or are they originally present in N. gonorrhoea? I'll start by saying that I am no biologist. I am a math major trying to create a mathematical model for gonorrhea strain competition. My assignment is to create a model similar to a model that was already was al... | {
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"tags": "bacteriology, mutations",
"url": null
} |
thermodynamics, energy, temperature, work
Title: Under what circumstances can I divide work by heat capacity to obtain a $\Delta T$ value? It is my understanding that one can divide Work (in joules) by heat capacity (J/Kelvin) to obtain a Kelvin value. Is this true? If so, under what circumstances is this the case? ... | {
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"tags": "thermodynamics, energy, temperature, work",
"url": null
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knew the exact running time of the algorithm. We use O-notation to. Lecture 3 Asymptotic Notation The result of the analysis of an algorithm is usually a formula giving the amount of time, in terms of seconds, number of memory accesses, number of comparisons or some other metric, that the algorithm takes. Asymptotic to... | {
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"lm_q2_score": 0.8267117962054049,
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"openwebmath_score": 0.8108016848564148,
"tags":... |
ros, navigation, pose, estimation, amcl
Originally posted by osmancns on ROS Answers with karma: 153 on 2016-02-16
Post score: 0
Original comments
Comment by nickw on 2016-02-16:
not sure what you would hope to do in that situation - If the robot can't localise itself, what would amcl be able to do. The pose estimati... | {
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terminology, drugs
One can then immediately guess the ancient organic names of natural products, with a little knowledge of plant names. What is the botanical name of tobacco? Nicotiana tabacum, so a chemist or whoever extracted nicotine named it after deriving from tobacco plant.
The word coffee and hence caffeine ar... | {
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"tags": "terminology, drugs",
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} |
statistical-mechanics
A ‘macrostate’ on the other hand is a state description relying on the macroscopic properties of the system: it’s temperature, pressure, volume, internal energy and such. For each macrostate, there are many, many microstates which result in the same macrospace: for example, if you interchange vel... | {
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superscripted to the right of the operator. Poisson Summation Formula As shown in § B. This formula will add together all numbers and cells within the parentheses. Author information: (1)Department of Mathematics, Carnegie-Mellon University, Pittsburgh, PA 15213, USA. ∆x= 3−1 n = 2 n xi=a+∆xi=1+ 2i n summation formulas... | {
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"lm_q2_score": 0.8376199552262967,
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"openwebmath_score": 0.874673068523407,
"... |
ros, ubuntu, ros-indigo, dependencies
Title: unmet dependencies problem ros indigo ubuntu 32 bits trusty
HI! How are you doing?
I'm following the instructions( http://wiki.ros.org/indigo/Installation/Ubuntu ) to install ROS Indigo in my 32bit PC, with Ubuntu:
Distributor ID: Ubuntu
Description: Ubuntu 14.04.5 LTS
... | {
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"tags": "ros, ubuntu, ros-indigo, dependencies",
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c, combinatorics
int countCycles(const char *name, int N) {
if(N <= 0 || N > MAXIMUM_DIGITS) {
return -1;
}
char buffer[MAXIMUM_DIGITS];
FILE *fp = fopen(name, "rb");
if(fread(buffer, N, 1, fp) != N) {
fclose(fp);
return -1;
}
fclose(fp);
int array[MAXIMUM_DIGITS];
for (int i = 0; i <... | {
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"tags": "c, combinatorics",
"url": null
} |
tools, julia
Title: Does anyone use Julia programming language? Is anyone using Julia (http://julialang.org/) for professional jobs?
Or using it instead of R, Matlab, or Mathematica?
Is it a good language?
If you have to predict next 5-10 years: Do you think it grow up enough to became such a standard in data science... | {
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io, rust
other os error
vs.
Is a directory (os error 21)
expect may be more compact than a match or unwrap_or_else, depending on the desired error format.
I don't believe the loop will ever loop, since the entire input is read into the string as discussed above.
If the loop did loop, reallocating the entire string ... | {
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"tags": "io, rust",
"url": null
} |
electrostatics, quantum-spin, charge, coulombs-law
So ultimately this sign comes from the fact that photons carry one unit of spin and the fact that the interactions between photons and matter particles have to obey the rules of special relativity. Notice the remarkable interplay of relativity and quantum mechanics at... | {
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"tags": "electrostatics, quantum-spin, charge, coulombs-law",
"url": null
} |
because the number of columns in $A$ matches the number of rows in $B$. Given $A$ and $B:$. tcrossprod (x) is formally equivalent to, but faster than, the call x %*% t (x), and so is tcrossprod (x, y) instead of x %*% t (y). This illustrates the fact that matrix multiplication is not commutative. The calculator gives u... | {
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"tags": null,
... |
c++, beginner, number-systems
So I want to know, am I heading in the right direction? Please let me know what I am not doing good or any kind of suggestion. What would Bob do?
You've written an interactive program, but the user does not know what your program does. Therefore, Bob—the generic user—might accidentally wr... | {
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"tags": "c++, beginner, number-systems",
"url": null
} |
c, beginner, statistics
printf("Enter the number of elements you want in the array between 0 and 1,000\n");
scanf("%d", &num);
//generate elements
for (i = 0; i < num; i++) {
x[i] = rand(time(NULL));
}
// print the generated elements
printf("The elements are:\n");
for (i = 0; i < num; i++){
pri... | {
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"tags": "c, beginner, statistics",
"url": null
} |
time-frequency
Also, is there a rigorous proof of the separation condition ?
Cohen just says:
$$ \left|\frac{A'_1(t)}{A_1(t)}\right| , \left|\frac{A'_2(t)}{A_2(t)}\right| \ll \left| \phi'_2(t) - \phi'_1(t)\right|$$
in equation 13.21.
Below is an attempt to visualize this. The blue plot is the absolute value of the F... | {
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} |
r, training, prediction, finance
But with this split I cannot get significant accuracies even trying with different datasets.
Do you have any suggestions? I think what you're doing is correct, in fact it would be even more correct to introduce a gap between your test and train set, i.e.
train <-head(stock_indicators,r... | {
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"tags": "r, training, prediction, finance",
"url": null
} |
javascript, php, jquery, beginner, mysql
// Hide details and stop, if the details are shown
if(detailsRow.length > 0) {
detailsRow.remove();
return;
}
// insert cached details and stop, if possible
if(clickedRow.data("details")) {
clickedRow.data("details").insertAfter(clickedRow);
... | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "javascript, php, jquery, beginner, mysql",
"url": null
} |
ions, metallurgy, purification, extraction
However, when looking it the definition of cementation, a crude summary of what happens is that one metal gets oxidized in order to reduce the other ion. I am assuming that this means that the zinc sulfate is getting reduced. However, what is reducing it? What equations are i... | {
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"tags": "ions, metallurgy, purification, extraction",
"url": null
} |
special-relativity, rotational-dynamics, speed-of-light, reference-frames, faster-than-light
Will the lazer that hits the MirrorA to east reach faster than the lazer that hits MirrorB? Considering that MirrorA is moving toward the lazer, and MirrorB is moving away from it?
And are there any experiments that show this... | {
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"tags": "special-relativity, rotational-dynamics, speed-of-light, reference-frames, faster-... |
ros, actionlib-tutorials
-- ~~ - actionlib_tutorials
-- ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-- +++ processing catkin package: 'actionlib_tutorials'
-- ==> add_subdirectory(actionlib_tutorials)
-- Using these message generators: gencpp;geneus;genlisp;gennodejs;genpy
-- Boost version: 1.58.0
-- Found the ... | {
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"tags": "ros, actionlib-tutorials",
"url": null
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• Elegant approach and solution. – Claude Leibovici May 9 '18 at 4:03
Define for $n\geq 1$ the numbers $x_{n+1}=\exp(x_{n}/n)$. Then $x_{1}=\log(x_{2})=\log(2\log(x_{3})),$ and so on.
We may observe that if $x_{1}\leq 1.367,$ then the sequence $x_{n}$ initially increases, then quickly decreases and stabilizes. If the... | {
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c++, template, vectors
This is totally fine and works. But it is a bad habit. If you change the types of the members you are potentially making your class inefficient as the members are constructed before the body of the class is entered. You then modify them in the body.
StdVector()
: buffer(new T... | {
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"tags": "c++, template, vectors",
"url": null
} |
evolution, mammals
Sloths go to the ground to urinate and defecate about once a week, digging a hole and covering it afterwards. They go to the same spot each time and are vulnerable to predation while doing so. The reason for this risky behaviour is unknown, although some believe that it is to avoid making noise whil... | {
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"tags": "evolution, mammals",
"url": null
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Hey,
Could I have proved,
$${{\sum_{i = 1}^{n}}{\frac{1}{i(i+1)}}} = {\frac{n}{n+1}}$$
by showing that it is a telescoping series? If so, how?
Thanks,
-PFStudent
10. Jan 30, 2008
### HallsofIvy
Staff Emeritus
$$\sum_{i=1}^{100} \frac{1}{i(i+1}= \frac{1}{1\cdot2}} + {\frac{1}{2\cdot3}} + {\frac{1}{3\cdot4}} + . ... | {
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"openwebmath_score": 0.7880914807319641,
"tag... |
SOLUTION ALERT! Don’t read any further if you want to solve this problem for yourself.
The first question relies on the fact that every cubic function has 180 degree rotational symmetry about its inflection point. This is equivalent to saying that the graph of a cubic function is its own image when the function’s gr... | {
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"lm_q2_score": 0.9046505376715775,
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"openwebmath_score": 0.803494930267334,
"tags": n... |
• The exact same thing (basically, an IIR filter) emerges also as a particular steady state solution to a Kalman Filter. I tried to find the original reference but I cannot locate the book right now. You might want to have a look at page 17, "Mixture Applications", in this reference instead. There is an equivalence bet... | {
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"lm_q2_score": 0.8596637505099167,
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"openwebmath_score": 0.7036049365997314,
"tag... |
Equate the $$x$$ and $$y$$ coordinates:
$$0+2t_1 = 0+4t_2 \Rightarrow t_1 = 2t_2 \tag{5}$$ $$18-3t_1 = 16-5t_2 \Rightarrow 18-6t_2 = 16-5t_2 \text{ (using (5) }) \Rightarrow2 = t_2 \tag{6}$$ and now substitute back into $$(4)$$:
$$\pmatrix { \begin{matrix} 0 \\ 16 \\ \end{matrix} } + 2 { \begin{pmatrix} 4 \\ -5 \\ \e... | {
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"id": null,
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"lm_q1q2_score": 0.8057260845083343,
"lm_q2_score": 0.8221891370573388,
"openwebmath_perplexity": 393.1936734546725,
"openwebmath_score": 0.9875684976577759,
"tag... |
javascript
ColorTable.tableSize is an example of the smurf-naming convention (see item 21). Drop the second instance of table to become ColorTable.size
For setIndex you return two different datatypes: index on success, and false for failure. Since index is an arguements known to external code, what purpose does this s... | {
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"tags": "javascript",
"url": null
} |
lengths. VAVG - (-VAVG ) ) in the sum of the two areas, thus resulting in zero average voltage over one To find the peak value from a given average voltage value, just rearrange the formula and divide by the. Previously Viewed. Make sure you enter. When the payments are all the same, this can be considered a geometric ... | {
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"lm_q1_score": 0.9833429590144717,
"lm_q1q2_score": 0.8798849102566718,
"lm_q2_score": 0.894789454880027,
"openwebmath_perplexity": 1900.9799295418693,
"openwebmath_score": 0.6601222157478333,
"tags": ... |
javascript, algorithm, sorting
// repeatedly places next item in correct spot using a "shift"
Pub.insertionSort = function (arr) {
var index_outer,
index_inner,
value,
length = arr.length;
for (index_outer = 1; index_outer < length; index_... | {
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"openwebmath_score": null,
"tags": "javascript, algorithm, sorting",
"url": null
} |
space, radiation
The solution is to only use 11B in ICs. (Boron is used in packaging and insulation layers on the ASICs.)
Another problem, which in some cases needs special ASIC designs (for special prices, of course) is photocurrent - gamma rays are like light, and will generate electricity right inside the silicon c... | {
"domain": "physics.stackexchange",
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"openwebmath_score": null,
"tags": "space, radiation",
"url": null
} |
c++, simulation
return std::pair<bool, tile*>(false, BoardTiles[0]);
}
void addFFactory(FoodFactory* FFactory)
{
FFactories.push_back(FFactory);
}
void addTile(tile* Tl)
{
BoardTiles.push_back(Tl);
}
void addAnt(Ant* mAnt)
{
BoardAnts.push_back(mAnt);
}
... | {
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"tags": "c++, simulation",
"url": null
} |
For $n = 0$,
\begin{align} [\epsilon]_0 &= [0]_0 = [1]_0 = [2]_0 = 1 \\ [\phi]_0 &= 0 \end{align}
We have $[\phi]_n\ = 0$, so we can simplify the above recurrences
\begin{align} [\epsilon]_n &= [0]_{n-1} + [1]_{n-1} + [2]_{n-1} \\ \tag{1} [0]_n &= [1]_{n-1} + [2]_{n-1} \\ \tag{2} [1]_n &= [0]_{n-1} + [2]_{n-1} \\ \t... | {
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"id": null,
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"openwebmath_perplexity": 1515.5409084855587,
"openwebmath_score": 1.0000098943710327,
"tags": n... |
c, console
Write a diagnostic message to standard error (not standard output),
so that it can not be mistaken for normal output, e.g. when
the program runs in a pipe. strerror(errno) gives you an error
message string corresponding to the last error, e.g.
"No such file or directory" or "Permission denied".
Terminate wi... | {
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"tags": "c, console",
"url": null
} |
logic, boolean-algebra, integer-programming
This creates $\log L$ new variables and 1 constraint for representing the binary breakdown of $a_i$. We then have $\log L$ XNOR variables, each which can be represented with 4 constraints. We can finally represent $M_{i,j}$ with $\log L + 1$ more constraints. Therefore, we ... | {
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"tags": "logic, boolean-algebra, integer-programming",
"url": null
} |
in the middle of an interview and in a jam. the convex hull of the set is the smallest convex polygon that contains all the points of it. Parallel Binary Search From Advanced Data Structures and Algorithms course So what Parallel Binary Search does is move one step down in N binary search trees simultaneously in one "s... | {
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"lm_q1q2_score": 0.8054058559000264,
"lm_q2_score": 0.8152324871074607,
"openwebmath_perplexity": 702.2431703921578,
"openwebmath_score": 0.4055248498916626,
"tags": null,
... |
galaxies
So I've always wondered: how are these structures formed?
One would (naively) expect that gravitationally bound structures would form as either spheres or discs. My PhD thesis was on the numerical simulation of the formation of clusters of galaxies, but it's not easy to give a concise answer. A useful first ... | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "galaxies",
"url": null
} |
quantum-field-theory, perturbation-theory, non-perturbative
If you want to calculate the poles associated with the bound states, you have to solve the EOM for the one-particle state which is one of constituent particles, in which the effects of other constituents (i.e., their operators in EOM) are replaced by external... | {
"domain": "physics.stackexchange",
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "quantum-field-theory, perturbation-theory, non-perturbative",
"url": null
} |
javascript, html, regex, web-scraping, webdriver
var buttonElements = document.getElementsByTagName('button');
var inputElements = document.getElementsByTagName('input');
var linkElements = document.getElementsByTagName('a');
var loginElement = null;
// For Button/Input
if (buttonElements != null){
loginElement = ... | {
"domain": "codereview.stackexchange",
"id": 11932,
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"openwebmath_score": null,
"tags": "javascript, html, regex, web-scraping, webdriver",
"url": null
} |
quantum-mechanics, operators, wavefunction, measurement-problem, observables
Title: If I want to determine a particle's momentum or position, do I get this information from the wave function? I am confused about how one measures the dynamical variables (eg position) of a particle. I thought the wave function $\Psi(x,t... | {
"domain": "physics.stackexchange",
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"tags": "quantum-mechanics, operators, wavefunction, measurement-problem, observables",
"... |
forces, waves, electromagnetic-radiation
I am just starting to learn about waves so this might be trivial. In the above, why are we interested in the transverse force which seems to be defined as the component of the tension force (which I am assuming is the force in the direction of the curve of the string) in the $f... | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "forces, waves, electromagnetic-radiation",
"url": null
} |
java, performance, strings, regex
I basically made everything a space and then removed all the extra spaces. Is that better than before? Is it even possible to merge the last replaceAll as well? I agree mostly with @Vogel612's answer, the second version is more concise and there is no need to litter variables all over... | {
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"openwebmath_score": null,
"tags": "java, performance, strings, regex",
"url": null
} |
classical-mechanics, phase-space
Title: Is a phase space a function? I saw a graph of a phase space of a pendulum and it looks like an $x-y$ plane with a spiral representing the speed and position (I assume from the origin).
Are all phase spaces two dimensional, or is this just one type? I am sure people can think of ... | {
"domain": "physics.stackexchange",
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"openwebmath_score": null,
"tags": "classical-mechanics, phase-space",
"url": null
} |
together us a simple way to determine symmetry... Polynomials together 11.5 ) represent angular momentum of the SH basis functions, we see this is consistent our! Collaboration with Peter Tait to write a textbook terms of spherical harmonics is therefore where the in... Legendre 's equation in all of space is { * } \ps... | {
"domain": "cen-aquitaine.org",
"id": null,
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"lm_q1_score": 0.9857180643966651,
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"lm_q2_score": 0.885631484383387,
"openwebmath_perplexity": 1748.1106351590208,
"openwebmath_score": 0.9481796026229858,
"tag... |
matlab, discrete-signals, cross-correlation, correlation, delay
Assume data1=[1 2 3 4 5 6 7 8 9 10] and data2=[0 0 0 0 1 2 3 4 5 6].From the data I know that, data2 is delayed by 4 samples.But to find the delay theoretically, I have applied cross correlation function.This was done in matlab using inbuilt function xcor... | {
"domain": "dsp.stackexchange",
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"openwebmath_score": null,
"tags": "matlab, discrete-signals, cross-correlation, correlation, delay",
"url": null
} |
Notice that $$\binom{21}{2} = \binom{20}{2} + \binom{20}{1} = \binom{19}{2} + 2\binom{19}{1} + \binom{19}{0},$$ so both the results in this answer are equal to $$2\left(\binom{19}{2} + \binom{19}{1} + \binom{19}{0}\right) = 2\times 191,$$ which has also been shown correct in another answer. What you will not be able to... | {
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"lm_q1q2_score": 0.8685992662597518,
"lm_q2_score": 0.8807970795424088,
"openwebmath_perplexity": 202.89980679504754,
"openwebmath_score": 0.735249936580658,
"tag... |
python, beginner, python-3.x, game, tkinter
def main_program_button(self):
"""
Builds the main program button
"""
main_program_button = Button(
self.current_frame_number,
text="LibLib Arriby",
font=("Helvetica", 35),
command=initialize_les... | {
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"openwebmath_score": null,
"tags": "python, beginner, python-3.x, game, tkinter",
"url": null
} |
cross-correlation, delay
import numpy as np
def gcc_phat(sig, refsig, fs=1, max_tau=None, interp=16):
'''
This function computes the offset between the signal sig and the reference signal refsig
using the Generalized Cross Correlation - Phase Transform (GCC-PHAT)method.
'''
# make sure the le... | {
"domain": "dsp.stackexchange",
"id": 9270,
"lm_label": null,
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"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "cross-correlation, delay",
"url": null
} |
c#, beginner, role-playing-game
Story.BeforeBandits();
Battle.WithBandit(Dash, Keith);
Battle.WithBandit(Dash, Ben);
Dash.LevelUp();
Story.BeforeKnights();
Battle.WithKnight(Dash, Leeroy);
Battle.WithKnight(Dash, Seth);
Dash.LevelUp();
Story.BeforeDra... | {
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"url": null
} |
electricity, electric-circuits
So the multimeter can't pick the real voltage drop up because the total resistance is too high but for some reason related to how the multimeter is built picks up a stable 0.1mV.
Also, the circuit extends from my hand to the floor I'm standing on to the table's legs up to the ground term... | {
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"tags": "electricity, electric-circuits",
"url": null
} |
c#, performance, excel
Title: Extracting data from .txt files and writing to Excel I am extracting data from .txt files and writing needed data to Excel. My problem is that my code is very very slow and at one point even slower (+35k txt files). How should I rethink this problem?
Microsoft.Office.Interop.Excel.Appli... | {
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"tags": "c#, performance, excel",
"url": null
} |
c++, c++11, reinventing-the-wheel, pointers
Title: Pointer handle - absolute follow-up This is a follow-up to:
Pointer handle - follow-up
Pointer class/handle
Please review my pointer class.
template<typename T>
class Ptr {
public:
Ptr(T* t, int s = 1) : sz{s<1 ? throw std::logic_error("Invalid sz parameter") : ... | {
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"tags": "c++, c++11, reinventing-the-wheel, pointers",
"url": null
} |
homework-and-exercises, classical-mechanics, work
In the example of a cylindrical well with water height below the top of the well, you'll find the center of mass of the water at $h_{water}/2$, which needs to be moved a distance of $h_{well} - h_{water}/2$. The total work that needs to be done is $mg(h_{well} - h_{wat... | {
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"tags": "homework-and-exercises, classical-mechanics, work",
"url": null
} |
material-science
To add to this answer: zirconia (ZrO2) is metastable in the tetragonal phase at STP, and will stay in that phase for very long times as part of a polycrystalline ceramic composite (5% degradation over 10 yr in mouths). Cracks near a t-ZrO2 grain will induce a volume-increasing phase change to a monocl... | {
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"tags": "material-science",
"url": null
} |
randomized-algorithms, polynomial-time, randomness, random-number-generator, open-problem
Title: Can we simply consider a pseudo random number generator to be a function $f: \Bbb{Z}_n \to \Bbb{Z}_n$ for ever-increasing $n$? On modern architectures, random number generators get seeded by the current system time as a so... | {
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2) We have obtained a stronger result than the fact that status "$$111111111$$" can be reached : all status can be reached.
3) The inverse $$B=A^{-1}$$ (see program) has been obtained with the following composite instruction using the so-called "adjugate" matrix :
B = mod(round(det(A)*inv(A)),2)
To be read in a se... | {
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"... |
\usepackage{caption}
\begin{document}
\frame{ %The shifted up columns occurs here
\frametitle{Transfer Matrix Method TMM}
\begin{columns}
\column[t]{0.5\textwidth}
\textcolor{blue}{This leads to tunnelling probability $T_x(E)$ which leads to knowing the current density $J(V)$.} %<- This is shifted up!
\column[t]{0.5\t... | {
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"lm_q2_score": 0.8577681013541611,
"openwebmath_perplexity": 10636.578619872458,
"openwebmath_score": 0.9461072683334351,
"ta... |
java, algorithm, strings, regex
Title: Function that shortens a String based on a term/abbreviation mapping with special cases This is a update of this question since the requirements for this task changed.
I have a function that takes a description as a String and returns a shortened version of the description.
The s... | {
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} |
ros, ros2, colcon, header, cmake
Originally posted by morten with karma: 198 on 2021-11-04
This answer was ACCEPTED on the original site
Post score: 0
Original comments
Comment by swiz23 on 2022-08-02:
In the pkg cmake, wouldn't you also need to include...
include_directories(
${temp_lib_INCLUDE_DIRS}
)
...before ... | {
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c++, beginner, array, sorting, integer
}
With this class, you would create an array of Teams which would all have these attributes. For example
Team new_team;
new_team.name = "Kansas";
new_team.wins = 5
// and the rest of the attributes
Note: I don't know the game of football nor am I American , I have just taken th... | {
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Comment. If $n$ is prime it is not always true that $2^n-1$ is prime. For example, $2^{11}-1=23\times89$.
• Thank you for providing proof, it really helps me see why this is true. Sadly, I have to wait three minutes to accept your answer. Sep 13 '14 at 13:06
• @Progo Don't be sad about having to wait to accept an answ... | {
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"tags... |
Appended :
k has been introduced into the OLTF in order to find its maximum value for stability. Using u = - 1 and subbing the value for w (found from the Imaginary segment) into the Real segment.
Below is my working for find an OLTF with Real and Imaginary segments separated ;
There are several methods to find out ... | {
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"lm_q2_score": 0.8670357563664174,
"openwebmath_perplexity": 508.96540794921304,
"openwebmath_score": 0.9985009431838989,
"ta... |
# Differentiability of $\int_{a} ^{x} F'(t) \, dt$ at $a, b$
This question is inspired from this answer where I prove that
If $$F:(a, b) \to\mathbb{R}$$ is a function with bounded and continuous derivative $$F'$$ in $$(a, b)$$ then the limits $$\lim_{x\to a^{+}} F(x)$$ and $$\lim_{x\to b^{-}}F(x)$$ exist.
The proof ... | {
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"lm_q2_score": 0.861538211208597,
"openwebmath_perplexity": 153.8898326273814,
"openwebmath_score": 0.9442311525344849,
"tags... |
javascript, jquery
or
var responsiveImage = $('.responsiveImage');
as I am not entirely sure what the difference between the two is.
With the first case I am making an object that contains all the image elements and I assume with the second case I am generating a variable that holds all the objects that are the i... | {
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"tags": "javascript, jquery",
"url": null
} |
photons, angular-momentum, nuclear-physics, conservation-laws, atomic-physics
Finally, this explanation,
This is since photons are bosons.
is just dead wrong. The fact that photons are bosons has nothing to do with anything. What does matter is that photons have spin angular momentum $1$, which puts the lowest-order... | {
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"tags": "photons, angular-momentum, nuclear-physics, conservation-laws, atomic-physics",
... |
quantum-field-theory, lagrangian-formalism, commutator, lie-algebra, dirac-matrices
-\frac{1}8 \bar\psi \gamma^\mu [(1-\gamma^5) \tau^a (1- \gamma^5) + (1+\gamma^5) \tau^a (1+ \gamma^5)]\psi = \\
-\frac{1}4 \bar\psi \gamma^\mu [\tau^a + \gamma^5 \tau^a \gamma^5] \psi $$
Now, the expected result (given for example in t... | {
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"tags": "quantum-field-theory, lagrangian-formalism, commutator, lie-algebra, dirac-matrice... |
we need to import data sets. Utilize powerful Python optimization libraries to build scientifically and systematically diversified portfolios ; Write custom Python code to estimate risk and return parameters ; Build custom utilities in Python to test and compare portfolio strategies ; Format :Open Enrolment. The python... | {
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"lm_q1_score": 0.9854964228644457,
"lm_q1q2_score": 0.8169162303742715,
"lm_q2_score": 0.8289388083214156,
"openwebmath_perplexity": 2427.45846134871,
"openwebmath_score": 0.20544473826885223,
"tags"... |
as as..., set the numerator and denominator at some graphs, to find locations where the,. We call this behavior the end behavior '', and it 's pretty easy # %. Of a function: Rises to the left and Rises to the right hand side seems decrease... To find similarities and differences be concerned with the behavior, and it ... | {
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"id": null,
"lm_label": "1. YES\n2. YES\n\n",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9766692318706085,
"lm_q1q2_score": 0.8262059542461945,
"lm_q2_score": 0.8459424411924673,
"openwebmath_perplexity": 484.2146184988172,
"openwebmath_score": 0.7733432054519653,
"tags"... |
discrete-signals, fourier-transform, fourier
$$ S(c\Omega) \Longleftrightarrow \left\{
\begin{array}{ll}
x[n/c] \textrm{ if } n/c \textrm{ is an integer } \\
0 \textrm{ otherwise.}
\end{array}
\right.$$
Other hints hinge around Dirichlet... | {
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"tags": "discrete-signals, fourier-transform, fourier",
"url": null
} |
deep-learning, comparison, deep-neural-networks, optimization, regularization
Can/should I use them together? You are correct.
The main conceptual difference is that optimization is about finding the set of parameters/weights that maximizes/minimizes some objective function (which can also include a regularization ter... | {
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"tags": "deep-learning, comparison, deep-neural-networks, optimization, regularization",
"url":... |
c#, excel, asp.net-mvc, controller
Session[_sessionImportedDenormalizedCatalogueItemsList] = importedItems;
if ((CatalogueType) Session[_sessionImportedDenormalizedCatalogueType] == CatalogueType.Spreads)
{
return RedirectToAction("PreviewSpreadItemsInDatabaseAndImportedExcelComparisonResu... | {
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"openwebmath_score": null,
"tags": "c#, excel, asp.net-mvc, controller",
"url": null
} |
vba, internet-explorer
End With
End Function
And now we don't need this anymore, because value is never going to be blank:
''
' If value is blank then the option wasn't provided.
Friend Sub Add(ByVal key As String, ByVal value As String)
If value <> "" Then criteria.Add key, value
End Sub
Actually, the HtmlFiel... | {
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"tags": "vba, internet-explorer",
"url": null
} |
electromagnetism, potential, relativity
... Lorentz contraction does not exist.
I simply can't understand this conclusion. | {
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"tags": "electromagnetism, potential, relativity",
"url": null
} |
general-relativity, gravity
Here's my question: If this is the case how come objects moving initially in the same direction but at different speeds, have end up having different trajectories? I mean, the length of a path doesn't depend on the speed you traverse it with? Unless some relativistic phenomena is at work? T... | {
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"openwebmath_score": null,
"tags": "general-relativity, gravity",
"url": null
} |
rosjava
Title: how to get args from node object of rosjava Node class?
Hey,
While running rosjava node we receive "node" object in onStart(Node node) function. Can we extract command line args from this "node" object. I tried to get NodeConfiguration and ParameterTree but did not work. Any idea?
regards
Originally p... | {
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Analyzes the data table by e-exponential regression and draws the chart. Modelling a BasketBall Shot (IB MYP Grade 10 Maths) Using quadratic regression equations to predict the outcome of a basketball shot. The greater the absolute value of the residual, the further that the point lies from the regression line. We are ... | {
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"id": null,
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"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9817357253887771,
"lm_q1q2_score": 0.8159628229910237,
"lm_q2_score": 0.8311430478583168,
"openwebmath_perplexity": 832.8144509660859,
"openwebmath_score": 0.41797417402267456,... |
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