Answered
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...

6 months ago | 0

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Answered
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...

6 months ago | 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...

6 months ago | 0

Answered
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...

7 months ago | 1

Answered
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...

7 months ago | 1

Answered
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...

7 months ago | 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...

7 months ago | 0

Answered
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...

7 months ago | 0

Answered
vpasolve does not solve simple equation
Well, look more closely at your question. Plot it. syms x; A = 6.742; B = 4.82; F = A - 2/(9*(1 - x)^(1/2)) - B*x fplot(F,[0,...

7 months ago | 0

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Answered
Any way to remove terms smaller than "digits" from symbolic expression? R2023a
While the solutions offered by @Paul and @Walter Roberson will both solve the problem you asked, be careful, as automatic approa...

8 months ago | 0

Answered
When I use nlinfit, the sintax nlinfit(t0,p0 ,@(b,t) ...),but if Ireplace nlinfit with fmincon, the sintax is not valid, why?
@Marcos there is no need to use global variables. For example... x = rand(20,1); y = 3 + 4*exp(x*1.5) + randn(size(x))/3; plo...

8 months ago | 0

Answered
Como puedo reiniciar mis cursos
"I took a course last year, completed it, and received the corresponding certificate. However, I need an updated certificate for...

8 months ago | 1

Answered
Mixing name/value pair syntax
I have at least a couple of reasons why, which is why I will pose this as an answer. Knowing exactly which deliberations were ma...

8 months ago | 0

Answered
**How can inflection points be robustly identified on a cumulative histogram (CDF) curve in MATLAB when only discrete, noisy CDF data is available?**
I'm sorry, but you are looking for magic that does not exist. An inflection point is a point where the SECOND derivative chang...

8 months ago | 1

Answered
Convex bivariate B-spline by construction (PSD Hessian)?
Even without thinking about it, I'm pretty sure the answer is no. Things get nasty when you move beyond one dimension, and 2d is...

9 months ago | 0

Answered
An easy way to input song chords into a structure of MATLAB
AVOID the function input. It only hurts your code, preventing you from growing. Learn to use other solutions for data input. One...

9 months ago | 2

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Answered
I'm using a 2020 Mac Mini. Will R2017a run on this computer if I upgrade to MacOS Tahoe?
No. 2017a will NOT run on Tahoe. Just read the docs to tell you which OS versions can run R2017a. https://www.mathworks.com/co...

9 months ago | 0

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Answered
Are iterative methods always better than direct methods for solving large linear systems?
The use case which some may miss here, is the very large array, where a dense solver fails due to memory, but even the sparse on...

9 months ago | 2

Answered
solving a system of linear equations where A is a 40*40 sparse matrix
I'd suggest that sparse is almost meaningless when the matrix is only 40x40. At that point, the dense solvers are still extremel...

9 months ago | 3

Answered
Putting spaces between elements of a string/
A = ['011001110000';'101111000000';'110100011000';'011010001100';'010101000110';'110010100010';... '100001010011';'10100010...

9 months ago | 2

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Answered
How to download the certificate
I'm sorry, but no, we cannot resolve your problem. Answers is not customer support. Answers is a volunteer forum, generally comp...

10 months ago | 0

Submitted

HPF - a big decimal class
High precision floating point arithmetic, a new class written in MATLAB

10 months ago | 6128 downloads |

4.9 / 5

Answered
Defining inequality constraint A*x <= b for genetic algorithm
As I said in my comment, you cannot set up a linear system of inequalities to constrain that curved path from self intersections...

10 months ago | 0

Answered
i want to add cplex and yalmip on my mac how ?
YALMIP is an external toolbox, written in MATLAB, so it could in theory be used by any MATLAB installation. However, it is proba...

10 months ago | 0

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Answered
flag a question as answered.
While DGM gave a very complete answer, worthy of acceptance in my eyes, I think, from a look at one of the other questions from ...

10 months ago | 1

Answered
Finite elements model using STABIL
I cannot test your code, as I lack the tools you are using. Regardless, IF you tell us the solve yields NaNs, then there are onl...

10 months ago | 0

Answered
Using logic to select specific values in a matrix
Well, you are doomed to failure, as long as you don't use the right variable names as you created them! A = [1, 0.1234 1,...

11 months ago | 0

Answered
In how many functions using the global variable, can a global variable be declared?
There is no limit on how many functions can use a global variable. At the same time, I will plead, for your own sanity, to recon...

11 months ago | 1

Answered
How do I plot a graph with the grid for trig functions with 0 ≤ x ≤ 2π
@Sean syms x f = cos(x) dfdx = diff(f) help fplot

11 months ago | 0

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Answered
Should I need keep in my PC previous versions of Matlab?
Some of us keep older releases, just to answer a question about an older release, testing out code in the old release. I do ten...

11 months ago | 0