Given matrices XX and YY of sizes 3X3, how can I generate the following matrix: [XX(1,1) YY(1,1); XX(1,2) YY(1,2)... ?

Given matrices XX and YY of sizes 3X3, how can I generate the following matrix:

[XX(1,1) YY(1,1); XX(1,2) YY(1,2);XX(1,3) YY(1,3); XX(2,1) YY(2,1); XX(2,2) YY(2,2); XX(2,3) YY(2,3); XX(3,1) YY(3,1); XX(3,2) YY(3,2); XX(3,3) YY(3,3)]

I mean of course, without writing it explicitly and without loops.

Thanks!!

Answer 1

[C.J. Harris]

or:

XX = magic(3);
YY = eye(3);

XX_trans = transpose(XX);
YY_trans = transpose(YY);

out = [XX_trans(:) YY_trans(:)];

[Gil]

thanks!!

Answer 2

[Matt Fig]

For example:

XX = magic(3);
YY = cumsum(ones(3));
% Your requested matrix.
ZZ = [reshape(XX.',[],1) reshape(YY.',[],1)]

[Gil]

thanks!!

Answer 3

[C.J. Harris]

This is one way of doing it - expanding on my answer to your previous question:

XX = magic(3);
YY = eye(3);

out = unique(nchoosek([1:3, 1:3], 2), 'rows');
XX_Array = arrayfun(@(x)[(XX(out(x,1),out(x,2)))], 1:size(out,1))';
YY_Array = arrayfun(@(x)[(YY(out(x,1),out(x,2)))], 1:size(out,1))';

combArray = [XX_Array YY_Array];

[Gil]

thanks!!