How to automatically create variables which are column extracts from a matrix

Question

I have an n*n matrix and I want to extract every 3 columns and keep the result in different variables.

I know that it is possible to do it in this way:

Answer 1

You really shouldn't split A this way. If you really want to adress A in 3 column block then use something like

A = (1:9).*((1:9).');
%% create anonymous function which can be called as Ac(1), Ac(2) and so on
Ac = @(n) A(:,(n-1)*3+1:n*3)

octave:2> Ac(1)
ans =

    1    2    3
    2    4    6
    3    6    9
    4    8   12
    5   10   15
    6   12   18
    7   14   21
    8   16   24
    9   18   27

octave:3> Ac(2)
ans =

    4    5    6
    8   10   12
   12   15   18
   16   20   24
   20   25   30
   24   30   36
   28   35   42
   32   40   48
   36   45   54