Non-repeating selection from sets
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Amir Mahmoudi
le 27 Déc 2023
Commenté : Amir Mahmoudi
le 28 Déc 2023
A is 1 by a matrix, B 1 by b, and C 1 by c. D is supposed to be the set of all non-repeating selection of respectively A, B, and C columns. What would be the most economical code of triples extraction? Thanks.
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Dyuman Joshi
le 27 Déc 2023
Modifié(e) : Dyuman Joshi
le 28 Déc 2023
%Random data
A = 1:3;
B = 1:4;
C = 1:5;
D = {A, B, C}
n = numel(D);
%Preallocate
out = cell(1, n);
%Reverse order to get the lexicographical order when concatenating
[out{end:-1:1}] = ndgrid(D{end:-1:1});
%Concatenate and reshape the data corresponding to number of vectors
out = reshape(cat(n,out{:}),[],n);
disp(out)
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