Use find
:
a = [2 4 6 8 10 0 7 18 9 0 8 2 0 5];
b = [1 3 0 5 70 8 6 87 1 9 7 8 0 2];
A = a( find( a > 0 & b > 0 ) );
B = b( find( a > 0 & b > 0 ) );
or even faster:
C = a( a > 0 & b > 0 );
D = b( a > 0 & b > 0 );
returns:
C =
2 4 8 10 7 18 9 8 2 5
D =
1 3 5 70 6 87 1 7 8 2
If you can be sure, that there are no values below zero you could also use:
E = a( logical(a) & logical(b) );
F = b( logical(a) & logical(b) );
which is a little faster, but containing also negative values.