I have vectors m, x, y & I want m1, x1, y1 as commented below: 

```
% given
m = [-4 -3 -2 2 3 4];
x = [2 5 6 7 9 1];
y = [10 23 34 54 27 32];

% required
% m1 = [2 3 4];    % only +ve value from m
% x1 = [13 14 3];  % adding numbers(in x) corres. to -ve & +ve value in m & putting below 2, 3, 4  respectively
% y1 = [88 50 42]; % adding numbers(in y) corres. to -ve & +ve value in m & putting below 2, 3, 4  respectively

m1 = m(m > 0)      % this gives me m1 as required

```

Any hint for x1, y1 will be very helpful.