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Nested if statements done elsewise?

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Konstantinos Belivanis
回答： Rick Rosson 2015-9-26
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!

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Rick Rosson
Rick Rosson 2015-9-26
N = 5000;
x = 2*rand(N,8) - 1;
u = (x<0);
v = (sum(u,2)==8);

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