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how to find possible combinations

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Postit123
Postit123 on 6 Nov 2020
Commented: Postit123 on 6 Nov 2020
Hello
There's a 32X10 matrix dataset and I want to need all possible 4X10 data combinations.
Plus the data of each row remain same through the combination.
Do you have any idea for this?
Thanks you.

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KSSV
KSSV on 6 Nov 2020
You mean you want 4X10X8 matrices of all combinations?

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Accepted Answer

Bruno Luong
Bruno Luong on 6 Nov 2020
Edited: Bruno Luong on 6 Nov 2020
% Test data
A=rand(32,10);
[m,n]=size(A);
I=nchoosek(1:m,4).';
% Each slice B(:,:,k) is a 4x10 (without-replacement) combination
B=permute(reshape(A(I,:),4,[],n),[1 3 2]);

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