## How to make a matrix with the entries being the number of even indices of that entry?

### Joshua Balfour (view profile)

on 13 Sep 2019
Latest activity Commented on by Walter Roberson

### Walter Roberson (view profile)

on 16 Sep 2019
I need to make a 12x12 matrix with the entries being the number of even indices of the entry.
So 1,1 would be 0, 1,2 would be 1 and 2,2 would equal 2.
The task is specifically using for loops or the meshgrid function.
Any help would be appreciated.

on 13 Sep 2019
What have you tried for your homework?
Joshua Balfour

### Joshua Balfour (view profile)

on 16 Sep 2019
mat = zeros(12,12);
x = 1:12;
y = 1:12;
[X, Y] = meshgrid(x,y);
a = mod(X,2);
b = mod(Y,2);
matrix = a + b;
This gives a matrix of:
matrix =
2 1 2 1 2 1 2 1 2 1 2 1
1 0 1 0 1 0 1 0 1 0 1 0
2 1 2 1 2 1 2 1 2 1 2 1
1 0 1 0 1 0 1 0 1 0 1 0
2 1 2 1 2 1 2 1 2 1 2 1
1 0 1 0 1 0 1 0 1 0 1 0
2 1 2 1 2 1 2 1 2 1 2 1
1 0 1 0 1 0 1 0 1 0 1 0
2 1 2 1 2 1 2 1 2 1 2 1
1 0 1 0 1 0 1 0 1 0 1 0
2 1 2 1 2 1 2 1 2 1 2 1
1 0 1 0 1 0 1 0 1 0 1 0
but this gives the odd indices, I want the even ones.
Walter Roberson

on 16 Sep 2019
1-mod(value,2)