John D'Errico
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Feeds
What exactly does ε represent in numerical computing
Just to add some more info... For example, pi(x) is known as the prime counting function to some, the number of primes less tha...
1 día hace | 0
Why does parfor slow down with large shared arrays?
I can't test this myself, and I lack a great understanding of the parallel tools. But it looks like there are a few issues, main...
3 días hace | 0
How to get abbreviations into vars?
Can you just exclude a term just by looking at it, without knowing the parameters in it? Given the complexity of the mess you ha...
7 días hace | 0
Why is vecnorm So Slow?
The jump is often a question of algorithm changes. You would be surprised how often algorithms exhibit nonlinear breaks. As I re...
8 días hace | 1
HDL coder support for Microchip high level synthesis tool SmartHLS
I'm sorry, but Answers is not a team. And we have no access to any information about timelines or any knowledge of when a given ...
14 días hace | 0
why does factor(1) return 1? shouldn't it return null?
Yes, I agree, in that f1 = factor(1) could arguably return empty. 1 is not indeed prime, and so the result is inconsistent wit...
20 días hace | 0
solve() returning empty, does a solution exist?
Just because solve returns empty does not mean a solution does not exist. In fact, most relations you can write down have absolu...
24 días hace | 1
| aceptada
Saving my path for future sessions.
The trick here is to use the help, because it teaches you what to use, at least it gives you a hint at how to solve it. If you m...
27 días hace | 0
Help using the toeplitz function
20x20 is not large by any measure I would ever imagine. 20000x20000 might be large. :) Of course, large is a purely subjective a...
alrededor de 1 mes hace | 0
| aceptada
MATLAB Randomly Changes Values in Array to Scientific Notation
It is literally a certainty that some of those values are only approximately integer. No question in my mind. And is certainly n...
alrededor de 1 mes hace | 0
| aceptada
How to call kummerU for a stand alone program
You cannot do it from MATLAB, as stated by others. However, it looks like python does offer similar functionality. And I believe...
alrededor de 1 mes hace | 0
Can I solve a symetric system using only the lower triangular portion of the matrix?
You don't show your matrix. Only a picture of it, and a picture is not quite worth a thousand words all of the time. ;-) But co...
alrededor de 2 meses hace | 0
free trail doubt issue
After it ends in 30 days, it will just end. You will have a choice then of continuing your use of MATLAB by paying the normal fe...
alrededor de 2 meses hace | 0
Volume and Surface Area of a Compound Geometric Object
First, alpha shapes tend to be poor at representing volumes with sharp internal corners, like those between the intersection of ...
alrededor de 2 meses hace | 1
Call parameters by their variable name in Simulink rather than having to index the value.
If you can pass in a vector, then you can pass in a structure. Just assign fields to the structure. parameters.khch = 2; There...
alrededor de 2 meses hace | 0
looking for creator of specific code
The codes I did find were a bit more sophisticated in general, and I did not expect to find anything. HOWEVER, when I looked on ...
alrededor de 2 meses hace | 1
¿Cómo podría solucionar matrices por el comando [L,U]? no sé nada respecto al tema
I think your confusion stems from a misunderstanding. LU is fine, even with rank deficient matrices. As long as you use the MATL...
alrededor de 2 meses hace | 0
Convergence error in numerical method.
99,9% probable user error, 0.1%, it could be real. Hey we cannot know, since we don't see your code. But the point is, you hav...
2 meses hace | 1
Minimally constraining an FEA Model in Matlab
If it is resting on a surface, it is not resting gently, in the sense that it CANNOT freely expand below the surface. In fact, y...
3 meses hace | 0
| aceptada
Find specified number of points on curve with identical chord length (not arc length)
Admittedly, interparc does not solve the problem you want to solve. At least, not the probem you CLAIM you want to solve. As the...
3 meses hace | 0
can this code be improved?
You have asked several questions. 1. Is it well written? 2. Can it be improved? Something you did not ask is if it SHOULD be imp...
3 meses hace | 0
Eigendecomposition not fully utilizing all cores on M1 pro, matlab 2025b
Some operations are not as easily parallelized when utilizing automatic mutithreading. That is possibly the case for eig, where ...
3 meses hace | 0
| aceptada
I want to decrease the time my Script
If you want to speed up your code, then you need to make the effort. We cannot possibly know what you are doing here, at least n...
4 meses hace | 0
| aceptada
Why Does polyval Return Zero When the Coefficients are Empty?
(This could easily better belong in a discussion than in Answers.) I could argue that any choice they made was arbitrary, becau...
4 meses hace | 0
Discussion
Little Fermat, a valuable tool for primality testing
In a previous discussion, https://www.mathworks.com/matlabcentral/discussions/tips/884294-oh-no-isprime-is-missing-just-kidding...
4 meses hace | 0
GA stops with different score every time, even with setting big MaxGeneations and MaxStallGenerations
Nonlinear solvers, of which GA is one, cannot be forced to ALWAYS return the optimal result. And while tools like GA are designe...
4 meses hace | 1
Does [V,D] = eig(A) always return normalized eigenvectors for any real matrix A?
Be a little careful that A is not in symbolic form, even if it is real and SPD. A = randn(4,3); A = A'*A % A MUST clearly be SP...
4 meses hace | 1
Is fit() deterministic when StartPoint is specified?
If the start point is specified, then yes, FIT should be deterministic. At that point there is no reason for any pseudo-random n...
4 meses hace | 2
Discussion
What is an emirp? Can we find a new world record size prime of this form, using only MATLAB, and a home computer?
An emirp is a prime that is prime when viewed in in both directions. They are not too difficult to find at a lower level. For ex...
4 meses hace | 0
fread a double that's been broken up into four 16 bit words
I don't see the problem. For example... Xtest = randn*100 Now, I'll split it into 4 hex numbers, each taking up 16 bits. Xhe...
4 meses hace | 0
