nchoosek with multiple arrays

Hello,

Is is possible to use nchoosek in such a way that will keep information for more than one column vector? For example, I have a 33x3 matrix and I'd like to find all possible combinations of trios for the first column, then run calculations on the data from the other two columns associated with each member of the trio from the first column.

Thank you so much in advance for your help!

Answer 1

[Stephen23]

Simply generate a matrix of indices:

idx = nchoosek(1:33,3);

and then for each row in that matrix perform your calculations, where M is your matrix:

for k = 1:size(idx,1)
    ix = idx(k,:);
    v1 = M(ix,1); % column 1
    v2 = M(ix,2); % column 2
    v3 = M(ix,3); % column 3
    ... do whatever with those vectors
end

[Valeria Villegas-Medina]

Thank you so much! This is exactly what I was thinking but I'm relatively new to coding and couldn't figure out the implementation. Do you happen to have a recommended tutorial channel?