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matlabmatrixcombinations
Lucas Martins Rocha
Lucas Martins Rocha

Reputation: 1

Column combination matrix

I want to combine columns of matrices, for example,

 A=[1,2,3;4,5,6]';B=[1,3,5;2,9,0]';

and I want

            C1=[1,2,3;1,3,5]' 
            C2=[1,2,3;2,9,0]' 
            C3=[4,5,6;1,3,5]' 
            C4=[4,5,6;2,9,0]'

How do I do that in matlab? Is there a function that does this?

Thanks!

Upvotes: 0

Views: 53

Answers (2)

Luis Mendo
Luis Mendo

Reputation: 112659

Is this what you want?

[ii, jj] = ndgrid(1:size(A,2));
C = permute(cat(3, A(:,jj), B(:,ii)), [1 3 2]);

The result is a 3D array such that (C(:,:,1) is your C1, etc:

C(:,:,1) =
     1     1
     2     3
     3     5
C(:,:,2) =
     1     2
     2     9
     3     0
C(:,:,3) =
     4     1
     5     3
     6     5
C(:,:,4) =
     4     2
     5     9
     6     0

Upvotes: 0

Greg Edelston
Greg Edelston

Reputation: 533

This should do the trick:

A=[1,2,3;4,5,6]';
B=[1,3,5;2,9,0]';
Cs = [];
index = 0;

for i = 1:length(A(1,:))
    for j = 1:length(B(1,:))
        index += 1;
        Cs(:,:,index) = [A(:,i), B(:,j)];
    end
end

Cs

Upvotes: 1

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