Make a function tha makes zero certain elements of the matrix corners as shown below

for example:

8 1 6
3 5 7
4 9 3

becomes

0 1 0
3 5 7
0 9 0

another example:

17 24 1 8 15
23 5 7 14 16
4 6 13 20 22
10 12 19 21 3
11 18 25 2 9

becomes

0 0 1 0 0 
0 5 7 14 0
4 6 13 20 22
0 12 19 21 0
0 0 25 0 0

Answer 1

[Azzi Abdelmalek]

n=5
A=randi(5,n)  %  ---Example-----
[n,m]=size(A)
nn=fix(n/2)
id=[1:nn n-nn+1:n]
A(id,[1 n])=0
A([1 n],id)=0

[Emmanuel Gutierrez]

Is there a way to do this using for loops?

Answer 2

[Andrei Bobrov]

Please use strel from Image Processing Toolbox

A = [17 24 1 8 15
23 5 7 14 16
4 6 13 20 22
10 12 19 21 3
11 18 25 2 9];

SE = strel('diamond',floor(size(A,1)/2));
out = A.*SE.Neighborhood