How to remove all rows with the same (specific) elements

If I have a, say 20x2 matrix, and I want to remove all rows with the entry 0 (column 1), 0 (column 2), how might I do that (and I want to be able to do it without having prior knowledge of the specific locations)?

M=[ 2 2
    1 3 
    5 7
    1 2 
    0 0 
    1 2 
    0 0 ]

Answer 1

[Mischa Kim]

Sean, you could use something like

 M(~any(M,2),:) = [];

[Sean]

Cheers