How can I delete multiple elements from an array?

Hi all,

Say I have an array that's really large, say, 1000 x 1000, and I want to look only at the 10th element of each row, and the 10th element of each column, which would produce a 100 x 100 array. How can I do this?

Cheers, Henry

Answer 1

[Star Strider]

This works:

A10 = A([1 10:10:end], [1 10:10:end]);

with ‘A’ being your (1000x1000) array.

[Henry Kricancic]

Nice, that works well enough - thank you.

What if I wanted to replace everything other than the 10th element of each row and column, with a zero? Which I would also like to do...

[Star Strider]

My pleasure.

If I understand correctly what you want, this works:

A10 = A([1 10:10:end], [1 10:10:end])
A0 = zeros(size(A));
A0([1 10:10:end], [1 10:10:end]) = A10;

[Henry Kricancic]

Wow, you bloody beauty mate - thank you! Exactly what I needed :)

[Star Strider]

My pleasure!