Problem 43675. Weave two matrices together to form one matrix

Take the first column from matrix a, then insert the first column from matrix b, and so on. For example:

 a = [1 2 3 4];
 b = [5 6 7 8];

 c = [1 5 2 6 3 7 4 8];

Solve

Last solution submitted on Jul 16, 2019

goc3 on 16 Dec 2016

The problem description and title have been improved while the test suite has been expanded to include matrices (not just vectors).