How to create non-repetitive random integers

Hi,

As the title suggests I want to create non-repetitive random integers but don't know how to... say 70 integers ranging from 1 to 100. is there a straight way to do this?

thanks,

Answer 1

[Grzegorz Knor]

Try this code:

N = 100;
x = randperm(N);
x = x(1:70)

[Mohammad Monfared]

thanks, first time to see this nice function ;)

[Dmitry Kaplan]

Another possibility (perhaps a little faster)

[~,idx]=sort(rand(100,1));
idx(1:70)

Answer 2

[Richard Brown]

randperm(100, 70)

[Mohammad Monfared]

thanks, I use matlab R2011a and the randperm doesn't accept two arguments.

[Richard Brown]

ah yes, that came in at R2011b

Answer 3

[Jan]

And if you are in a hurry: FEX: Shuffle