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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...

circa 2 anni fa | 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...

oltre 2 anni fa | 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...

oltre 2 anni fa | 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...

oltre 2 anni fa | 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 ...

oltre 2 anni fa | 0

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

oltre 2 anni fa | 0

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

oltre 2 anni fa | 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...

oltre 2 anni fa | 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...

oltre 2 anni fa | 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...

oltre 2 anni fa | 0

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Domanda

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...

oltre 2 anni fa | 2 risposte | 0

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Risposto
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...

oltre 2 anni fa | 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...

oltre 2 anni fa | 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]...

oltre 2 anni fa | 0

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Domanda

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...

oltre 2 anni fa | 1 risposta | 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 ...

oltre 2 anni fa | 0

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

oltre 2 anni fa | 0

Domanda

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...

oltre 2 anni fa | 3 risposte | 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...

oltre 2 anni fa | 0

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

oltre 2 anni fa | 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)

oltre 2 anni fa | 1

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Risposto
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...

oltre 2 anni fa | 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...

oltre 2 anni fa | 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...

oltre 2 anni fa | 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); ...

oltre 2 anni fa | 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(...

oltre 2 anni fa | 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

oltre 2 anni fa | 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...

oltre 2 anni fa | 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 ......

oltre 2 anni fa | 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 = ...

oltre 2 anni fa | 0