if i have two matrix in different size how can i subtract it By adding zeros row or column ??

if i have n X m matrix like this (6,6) i want to make the X in size (6,m/2) by adding zeros row and column

 X_before = [ 1 2 
              1 1
              2 1 ]

so

 X_after = [ 1 2 0 
             1 1 0
             2 1 0
       0 0 0
       0 0 0
       0 0 0 ]

AND i want to this matrix Z to be (n/2,6) like

        Z_before = [ 0 1 1 2 
                     1 1 2 1 ]

       Z_after = [  0 0 0 0 0 0
                    0 1 1 2 0 0
                    1 1 2 1 0 0 ]

Answer 1

[Azzi Abdelmalek]

x=[1  2  3;4 5 6]

You can add zeros horizontally

n=3
x=[x zeros(size(x,1),n)]

or vertically

x=[x;zeros(n,size(x,2))]