how to randomly vary 2 numbers?

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Isabel
Isabel 2012-7-5
回答： Orazio Sorgonà 2022-4-2
Hi! I want to generate a column of 30 randomly varying -1s and 1s. How can I do that? I was trying randi([-1:2:1],30,1) but that gives me zeros too and I don't want zeros, only -1 and 1. Thanks

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John Petersen
John Petersen 2012-7-5
x = 2*round(rand(30,1)) - 1;
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John Petersen
John Petersen 2012-7-5
编辑：John Petersen 2012-7-5
No it doesn't. Maybe you didn't grab the whole line?
Isabel
Isabel 2012-7-5
Sorry, it does work, my bad. I think I din't copy the whole formula or something. Thank you very much for your answer!

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更多回答（2 个）

Andrei Bobrov
Andrei Bobrov 2012-7-5
编辑：Andrei Bobrov 2012-7-5
eg
A = (rand(5) > .5) + 0;
A(~A) = -1;
or
A = 2*randi([0 1],30,1) - 1;
Orazio Sorgonà
Orazio Sorgonà 2022-4-2
I use
A = -1^(randi([1,2]));

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