Circular Shift Columns

This function quickly and independently circularly shift each column of an input matrix

CIRCSHIFT_COLUMNS Circularly shift each column by a different amount

B = CIRCSHIFT_COLUMNS(A, SHIFT_VECTOR) circularly shifts the columns in A
by the values specified in the vector D. Negative elements of D shift columns up
and positive values shift columns down.

B = CIRCSHIFT_COLUMNS(A) generates random shift values bound
between 0 and the number of rows in A.

[B D] = CIRCSHIFT_COLUMNS(...) returns the vector of shift values

Example:
A = [ 1 1 1; 2 2 2; 3 3 3; 4 4 4];
B = circshift_columns(A, [0 1 -2]);
B = 1 4 3
2 1 4
3 2 1
4 3 2