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How do I include or make a discrete variable for an optimization problrm?
To restrict x1 to { 2, 5, 7, 8 } You might make slack variables x1 = 2 + 3*y1 + 2*y2 + 1*y3; with constrants y1, y2, y3 inte...

2 years ago | 0

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Proper way to call designfilt for filtfilt
@Paul I have a question, you select the original phase for sqrtVfreq sqrtVfreq = sqrt(abs(Vfreq)).*exp(1j*angle(Vfreq)); Is it...

2 years ago | 0

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Collaborative work environment in app designer
We are not working with App Designer but with GUI, and we have the same issue, there is np way to merge or rebase correctly dif...

2 years ago | 0

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Answered
Can I use a Matlab function as a callback of a C library when using loadlibrary and calllib ?
No MATLAB function are propritary and cannot directly inferfacing with anything (else). You have to wrap it in appropiate interf...

2 years ago | 1

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How to find the matlab interp1 computational complexity?
If N is the number of data points (x, y), M is the query points (xq) interp1(x, y, xq, ...) has complexity of O(M*log(N)) for ...

2 years ago | 0

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Answered
Generate all possible permutations including repeats
F = [0,1,2]; combinations(F,F,F)

2 years ago | 0

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Answered
Creating equidistant point on a 2D boundary plot
Check out https://www.mathworks.com/matlabcentral/fileexchange/34874-interparc

2 years ago | 1

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Answered
Related to finding columns of a matrix satisfying specific conditions
% Generate a test matrix X = rand(8, 500); X(:,10) = [0 0 3 0 5 0 0 0]; X(:,20) = [0 0 0 0 5 0 0 0]; % won't be detected si...

2 years ago | 0

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Matlab crashes with large matrix
For 1e6 column the memory required in Gb for one array is memgGb = 1e6*12e3*8 / 1e9 And you have the cell array + the concaten...

2 years ago | 1

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Efficiently calculating the pixels crossed by a ray bundle
I only add an altervative to the for-loop at the end. On my PC the runtime if about 10 time faster. %all of this is usually su...

2 years ago | 0

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Question

Proper way to call designfilt for filtfilt
The command designfit is used to design a filter with user high level specification of the response funtion. The result of desig...

2 years ago | 2 answers | 0

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Answered
Minimize multivariable function with multivariable nonlinear constraints in MATLAB
x0 = [0;0;0;0;0;0]; x = fmincon(@mycost,x0,[],[],[],[], [],[],@mycon) function f = mycost(x) f = (x(1)*x(3)*cos(x(4))); en...

2 years ago | 1

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Quick method in solving symmetric linear equation
If your S is sparse you should look at iterative methods. For symmtric case it is recommended to use pcg. To take further advant...

2 years ago | 0

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Answered
Multiply slices of 3D matrices without duplicating in memory
This would do m = 100; n = 10; S=rand(m,n,n); W=rand(n,n,n); X=pagemtimes(S,reshape(W,[n n 1 n])); X=reshape(X,[m n n^2]...

2 years ago | 0

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Question

Unexpected result using cellfun with 'size' as first argument on string array
The title of the topic says it all, but here is the result I would not expected. Is this behaviour intended? or is it a bug? s...

2 years ago | 1 answer | 0

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why does not "pchip" requires derivative values as input
Since the derivatives are computed internally as with general polynomial picewise functions. It satisfies : interpolation on ...

2 years ago | 0

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What frustrates you about MATLAB? #2
The function combinations returns a table instead of standard array.

2 years ago | 0

Question

Error "Method 'Control' is not defined for class 'matlab.graphics.controls.internal.Control'"
fig = figure('Name', 'test'); t = tiledlayout(fig, 4, 4); The latest instruction throw this strange error on one of my...

2 years ago | 3 answers | 0

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Answered
Issue with optimizing vectorized code with logical matrixes
My guess is that you run into memory problem. During the assigment gamma(loc#) = theta(loc#) There are perhaps 3 copy of a bi...

2 years ago | 0

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Answered
Whether Matlab is compatible with macOS?
https://www.mathworks.com/support/requirements/matlab-mac.html

2 years ago | 1

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how velocize it? (vectorize it)
a=magic(8) b=[1 3 2 4 5 5 8 3] % (b is always >0) B = a.* ((1:size(a,1))' >= b)

2 years ago | 1

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Answered
How to avoid unnecessary legends in the graph?
h=plot(t,TGN,t,T1N,t,ML1N,t,ML2N,t,ACN,t,EMSB1N,t,MFN,t,mainN); xticks([43200 129600 216000 302400 388800 475200]) xticklabels...

2 years ago | 0

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Answered
Valid Shape FFT Deconvolution
You just do something that is obviously impossible. By FFT with truncation X = fft(x,L) You don't use the n-1 last elements s...

2 years ago | 0

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Find maximum difference between two arrays
No need to compare all the pairs A = randn(1,101); B = randn(1,101); dmaxBruteForce = max(abs(A-B.'),[],'all') dmaxSma...

2 years ago | 1

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How do I get largest distance between two rows in an nx3 matrix?
For euclidian distance, the largest distance must contain 2 points on the convex hull xy = randn(10000,2); K = convhull(xy); ...

2 years ago | 0

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How to access struct member via a string
I made this for my own use. It is not a dot syntax, just the functional form. The constraint is that accessing nested subfield(...

2 years ago | 0

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How to map two data sets on same xy coordinates for density-based comparison (hist3)?
Specify edges rather than (resolution) nbins https://www.mathworks.com/help/stats/hist3.html#d126e546264

2 years ago | 0

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Answered
Shuffle order of cell array without repeating rows
This does not require any special structure of the input (such as number of elements; or groups, or cardinal of groups, or the o...

2 years ago | 0

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Nested for loop - adding elements to a matrix
Try this modification EEG_NofSC = zeros (Nchannels,Nepochs); % move outside the outer loop for iNepochs = 1 : Nepochs ......

2 years ago | 0

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Answered
Error: Warning: Matrix is close to singular or badly scaled. Results may be inaccurate.
N=30; % compute the chebyshev differentiation matrix and x-grid Ly =3; eta_ygl = 2/Ly; etagl = -cos(pi*(0:N)/N)'; ygl = ...

2 years ago | 0