how to generate a matrix with all possible combinations in an efficient way
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I have n=1:4 and m=3, and I want to generate a matrix S whose rows are all the possible combinations.. i.e., S has 4^3 rows and 3columns. What is the mist efficient way to do this as I want to extend matrix to be of 50^10 rows and 10 columns (very large)
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Guillaume
le 30 Août 2019
very large is a massive understatement, as Bruno says. Looking a this wikipedia entry, you might be able to store your matrix if you manage to convice google to lend you all of their data centres. Good luck!
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Guillaume
le 30 Août 2019
%n: a vector of numbers
%m: a scalar integer
allcombs = cell(1, m);
[allcombs{:}] = ndgrid(n);
allcombs = reshape(cat(m+1, allcombs{:}), [], m);
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