cols
Returns the columns of a matrix as a list of vectors.
Syntax

cols(A)

A
is a matrix

Description
If A
is a matrix, then cols(A)
is the list of columns of A
, each column being represented by a vector.
Examples
A ≔ ❨❨2, 1, −i❩, ❨1, 0, 2❩, ❨4, i, 2❩, ❨0, 1, −1❩❩
⎛ 2 1 −i⎞ ⎜ 1 0 2⎟ ⎜ 4 i 2⎟ ⎝ 0 1 −1⎠
cols(A)
(2, 1, 4, 0) (1, 0, i, 1) (−i, 2, 2, −1)