how to random -1 and 1?

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Tia
Tia on 27 Jul 2013
Answered: Mendi on 19 Aug 2020
m=round(2*rand(8)-1)
the output:
m =
1 0 0 1 0 0 0 -1
1 1 0 0 1 1 0 -1
0 1 -1 0 0 0 1 1
1 0 0 1 0 0 1 0
0 0 -1 1 1 -1 1 1
-1 -1 -1 1 -1 0 0 -1
-1 -1 1 -1 0 -1 1 0
0 -1 0 1 1 0 0 0
but i don't want zero's output. can anyone help me clear this? thanks

Accepted Answer

Azzi Abdelmalek
Azzi Abdelmalek on 27 Jul 2013
Edited: Azzi Abdelmalek on 27 Jul 2013
m=randi(2,8)-1
m(~m)=-1
%or
m=randi([-1 ,1],8)
m(~m)=-1
%or
m=fix(rand(8)+0.5)
m(~m)=-1
  3 Comments
Tia
Tia on 27 Jul 2013
ok, thank you for your advice

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More Answers (2)

Andrei Bobrov
Andrei Bobrov on 27 Jul 2013
Edited: Andrei Bobrov on 27 Jul 2013
2*randi([0 1],8)-1
or
2*(rand(8)>.5) - 1
  2 Comments
James Tursa
James Tursa on 17 Apr 2019
Yes, the probability of getting -1 and +1 is 0.5

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Mendi
Mendi on 19 Aug 2020
randsample([-1, 1],8,true)

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