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Is there a supported alternative to feature('numCores') to get the number of cores available for a parallel solution
What about: maxNumCompThreads()

casi 4 años hace | 0

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Sum(sum()) with optimization variable
What about this: L = reshape(1:size(x,3),1,1,[]) b = L >= t-pt_rj & L <= t; Constraint2 = sum(sum(b.*x,3),1) <= ones(1,size(...

casi 4 años hace | 0

Respondida
Optimization: Reuse calculations from objective function in nonlinear constraints function
You can use this design pattern function preciousvalue = expensivereuse(inputs) persistent lastresult if ~isempty(lastresult)...

casi 4 años hace | 1

Respondida
How to compare values in respective columns using "ismember"
use ismember on each column separately for j=1:size(A,2) A(:,j) = ismember(A(:,j),B(:,j)); end

casi 4 años hace | 1

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Respondida
Intersection of two curves
Intersection of to things that are not comparable? why not? just avoid using it to conclude anything that matters. N = [1 2 3 4...

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Respondida
Is it possible to specify the 'order' of a smoothing spline?
See if this can helps you https://www.mathworks.com/matlabcentral/fileexchange/25872-free-knot-spline-approximation

casi 4 años hace | 0

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Respondida
Matlab Extracting X and Y coordinates
See here

casi 4 años hace | 0

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Natural Cubic Spline Interpolation
You made at least 2 mistakes: h is not computes Typo "x" instead of "X" The rest of the algorithm I didn't look at carefully ...

casi 4 años hace | 0

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Finding a propriate function to fit "U" curve
This is the best I come up with using BSFK FEX x=[0.17 0.33 0.83 1.67 2.5 3.33 5]; y=[6.62466 5.58235 4.63169 5.08213 5.4159 5...

casi 4 años hace | 0

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linprog ignores options, why?
Can you run with exitflag and output [x, fval, exitflag, output] = linprog( c, A, b, [], [], [], [], options ) and share them...

casi 4 años hace | 1

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Respondida
Why does MATLAB differentiate between strings and character array data types?
strings is introduced recently and the behavior is not the same than char array, an historic class. So they create a new class t...

casi 4 años hace | 0

Respondida
Supplying gradient for the subset of parameters
May be you could provide the gradient interface for all, but compute the subset derivative analytically and the complement by fi...

casi 4 años hace | 1

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Matrix algebra AxB=C, I want to solve for B
You can't recover the "original" B, whatever it is, your system is underdetermined (much more unknowns - 1826 - than equations -...

casi 4 años hace | 1

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How can I assign zeros to a particular value in an expression
test function test N =4; u = (1:N); v = (N:2*N-2); function ui = getu(i) if i <= 0 | i >= 4 ui = 0; else ui =...

casi 4 años hace | 0

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Respondida
How to find x value for a known y in array plot?
* x = linspace(-3,3); Assuming your data are monotonic on the neighborhood of the max y = exp(-x.^2); [maxy, imax] = max(y...

casi 4 años hace | 0

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pause() function is inaccurate
The accuracy is documented. "The accuracy of the pause function is subject to the scheduling resolution of your operating syste...

casi 4 años hace | 1

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Question about the fminsearch Algorithm
fminsearch is an mfile, you can copy it then mofify these lines #196 (R2022a) % Set up a simplex near the initial guess. % PUT...

casi 4 años hace | 0

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How to reduce the usage of "broadcast variables" when using parfor
You can use parallel constant to convert el, el_row1, ds, vmin to constant and reduce the data transfert, if they are not modifi...

casi 4 años hace | 1

Respondida
Concatenate arrays of different length inside loop
What's wrong with cell? vox_count_cell = cell(1, length(image_files)); for i = 1:length(image_files) header = spm_vol(ima...

casi 4 años hace | 0

Respondida
How do I implement multistart with lsqnonlin in my code?
"it returns the initial value" It indicates that the fit fails, not problem of wrong stating points (converge to local minima)....

casi 4 años hace | 0

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solve equation numerically 1=(1/y)x*exp(x*y)
Numercial solution y = 0.01:0.01:1; x = nan(size(y)); for k=1:length(y) yk = y(k); x(k) = fzero(@(x)x.*exp(x.*yk)-y...

casi 4 años hace | 0

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Respondida
How can I find negative factorial ? (-0.5)!
There are actually different ways of extending factorial function, see here http://www.luschny.de/math/factorial/hadamard/Hadam...

casi 4 años hace | 1

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install standalone application on macOs, that was compiled on windows
" According to Matlab, I think it should be possible ( https://de.mathworks.com/help/compiler/install-deployed-application.html ...

casi 4 años hace | 0

Respondida
Remove all rows of an array based on a value in a column, and also remove all rows that have the same values as this row in other columns
M = [ 15.88 18.43 15.88 18.43 0 15.88 18.43 33.48 14.99 ...

casi 4 años hace | 0

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Respondida
why is acumarray much slower calculating means than sum?
The default behavior of accumarray is sum and it's low-level coded. When you pass user-defined function MATLAB will call the fu...

casi 4 años hace | 2

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Pregunta

reduction variables and evaluation order
This the doc on can read "A reduction variable accumulates a value that depends on all the iterations together, but is independ...

casi 4 años hace | 1 respuesta | 1

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Respondida
Adding fields to a struct?
[PR1Data.filename] = deal(''); or if you PR1Data is non empty PR1Data(1).filename = '';

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Respondida
Faster way to create a matrix of the unique() of each row of a matrix
% Test example A=randi(4,10,5) [m,n] = size(A); As=sort(A,2); b=[true(m,1),diff(As,1,2)>0]; R=repmat((1:m)',1,n); C=cums...

casi 4 años hace | 1

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Respondida
How to create 3D matrix with empty cells
cell(3,3,3) % replace 3 with 300 for you I'm still afraid you'll be soon in trouble if you ask such question about easy data cr...

casi 4 años hace | 0

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Respondida
Fit coefficients are equal (to starting points) in 3000 different fits
Can you do check whereas they are identical with this command after the loop isequal(Coefficients(:,10),Coefficients(:,2999)) ...

casi 4 años hace | 0

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