My matrix A (:, :, :) is 10 * 1000 * 30
I want to turn it into 10 * 30000 matrix

At first I think method is to make B (:, :)=(A (:, :, 1) A (:, :, 2) A (:, :, 3) A (:, :, 4) A (:, :, 5), A (:, :, 6) A (:, :, 7)... A (:, :, 30)]
So had been listed out, is there any simple way?