interweave

This function interweaves (alternates/overlaps) the columns of equal-sized matrices A,B,C...

The first column of the output is the first column of A.
The second column of the output is the first column of B, followed by C etc.
Then the second columns of A,B,C...
The final column of the output is the final column of the last input matrix.

Example: A = ones(3); B = ones(3)*2;
C = ones(3)*3; D = interweave(A,B,C)