how can i generate a random number out of a range??

i need to generate a random number out of a range, i did it inside with r=-1+(2).*rand(1,1) %my interval is (-1;1)

how can i do to get a random number that is not in this interval?? i mean, a number which satisfy r<-1 U 1<r

Answer 1

[Azzi Abdelmalek]

a=rand
out=1/a*sign(a-0.5)

%or for a vector

n=10;
a=rand(1,n);out=1./a.*sign(a-0.5)

[Amit]

I think this technique would be biased. The negative random number would be always bigger while the positive ones will always be smaller.

[Azzi Abdelmalek]

You are right, if we use rand twice, it will be different

n=10;
out=1./rand(1,n).*sign(rand(1,n)-0.5)

Answer 2

[Amit]

A = [1/rand -1/rand];
r = A(randi(2));

(or)

r = [1/rand -1/rand]*(randperm(2,2) -1)';

Either will generate a random number from r<-1 U 1<r