How to select a submatrix (not in any particular pattern) in Matlab

Question

How to select a submatrix (not in any pattern) in Matlab? For example, for a matrix of size 10 by 10, how to select the submatrix consisting of intersection of the 1st 2nd a

Answer 1

Let me explain with an example:

Let's define a 6x6 matrix

A = magic(6)

A = 
35     1     6    26    19    24
 3    32     7    21    23    25
31     9     2    22    27    20
 8    28    33    17    10    15
30     5    34    12    14    16
 4    36    29    13    18    11

From this matrix you want the elements in rows 1, 2 and 5, and in the columns 4 and 6

B = A([1 2 5],[4 6])

B = 

26    24
21    25
12    16

Hope this helps.