Nested if statements done elsewise?

Hello all,

I have a huge matrix of NNNNNNx8 elements. I would like to receive a vector with true or false, 1 or 0 values with the result of all 8 elements of each row to be simultaneously negative. That means a NNNNNNx1 matrix.

Of course I can do it with nested if statements and a loop for all rows but it slows down my program by a lot. If you can suggest any faster way of doing it?

Thanks in advance!

Answer 1

[Rick Rosson]

N = 5000;
x = 2*rand(N,8) - 1;
u = (x<0);
v = (sum(u,2)==8);