How can I make a random array with values of either -1 or 1?

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Quinlin Hamill
Quinlin Hamill 2016-10-24
评论： Quinlin Hamill 2016-10-24
I'm trying to use randi to make a matrix filled with either -1 or 1 however randi also includes 0s.

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Image Analyst
Image Analyst 2016-10-24
Try this:
r = 2 * randi(2) - 3
I just answered this very recently.

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George
George 2016-10-24
编辑：George 2016-10-24
You can use rand
% pseudo code
x = rand(50,1);
pos = x >= .5;
neg = x < .5;
x(pos) = 1;
x(neg) = -1;
This suffers from the fact that you have to make a decision when randn returns 0.5 exactly..

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