# Bruno Luong

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**Content Feed**

Sharing Variables between app and matlab workspace?

Put this statement after you generate your data in the callback mydata = ... assignin('base', 'mydata')

6 hours ago | 0

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

What about: maxNumCompThreads()

22 hours ago | 0

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(...

1 day ago | 0

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)...

1 day ago | 1

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

1 day ago | 1

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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...

2 days ago | 1

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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

2 days ago | 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 ...

3 days ago | 0

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...

4 days ago | 0

linprog ignores options, why?

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

4 days ago | 1

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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...

4 days ago | 0

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...

5 days ago | 1

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 -...

5 days ago | 1

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 =...

6 days ago | 0

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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...

6 days ago | 0

pause() function is inaccurate

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

6 days ago | 1

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...

6 days ago | 0

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...

6 days ago | 0

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...

6 days ago | 0

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)....

6 days ago | 0

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...

6 days ago | 0

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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...

7 days ago | 1

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 ...

7 days ago | 0

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 ...

7 days ago | 0

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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...

7 days ago | 2

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Question

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...

8 days ago | 1 answer | 1

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answerAdding fields to a struct?

[PR1Data.filename] = deal(''); or if you PR1Data is non empty PR1Data(1).filename = '';

8 days ago | 1

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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...

9 days ago | 1

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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...

9 days ago | 0

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