MATLAB: Create zeros in matrix size, but not 1. column and row, or last column and row

Question

Hi

I am trying to make a matrix where the middle has to be changed into zeros, f. ex. with magic(4)

v=magic(4)

v(2,2)=0; v(2,3)=0; v(3,2)=0; v(3,3)=0;

    16     2     3    13
     5    11    10     8
     9     7     6    12
     4    14    15     1

Here i want the 11, 10, 7 and 6 to be zeros. But need it to be done in random size matrix.

Pretty new in the whole matlab world.

Anyone whom can help?

Answer 1

 v(2:3,2:3) = 0;

Note: This method only works for rectangular regions. For other shapes you need to use linear indexing.