variable positions in matrix

Hi Is it possible to easily switch the variable positions in a matirx. For example, I have 4 time series variables, x1, x2, x3 and x4. They form a matrix [x1 x2 x3 x4]. In my program, I want to give an indix that to each of these variables such that if I put 2 1 3 4, the matrix will become [x2 x1 x3 x4]. Many thanks

Answer 1

[Image Analyst]

I think you just did it, didn't you? If you want and just have an array x, you can do

new_x = [x(:,2), x(:, 1), x(:, 3), x(:, 4)];