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

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Joshua Balfour 2019-9-13

评论： Walter Roberson 2019-9-16

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.

Joshua Balfour 2019-9-16

编辑：Joshua Balfour 2019-9-16

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 2019-9-16

1-mod(value,2)

Jos (10584) 2019-9-13

help meshgrid
help rem

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