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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年以上前 | 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年以上前 | 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年以上前 | 0

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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年以上前 | 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年以上前 | 0

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

2年以上前 | 0

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

2年以上前 | 1

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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年以上前 | 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年以上前 | 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年以上前 | 0

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質問

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年以上前 | 2 件の回答 | 0

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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年以上前 | 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年以上前 | 0

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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年以上前 | 0

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質問

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年以上前 | 1 件の回答 | 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年以上前 | 0

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

2年以上前 | 0

質問

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年以上前 | 3 件の回答 | 0

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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年以上前 | 0

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

2年以上前 | 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年以上前 | 1

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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年以上前 | 0

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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年以上前 | 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年以上前 | 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年以上前 | 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年以上前 | 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年以上前 | 0

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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年以上前 | 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年以上前 | 0

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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年以上前 | 0