function p = NRandPerm(n,nret)
%NRandPerm Random permutation.
% NRandPerm(n,nret) is a random permutation of the integers from 1 to n,
% of which nret elements are returned.
% NRandPerm thus returns a random selection of integers from 1 to n with
% no repeats.
%
% For example, NRandPerm(6,4) might be [2 4 5 6].
%
% Note that NRandPerm calls RAND and therefore changes RAND's state.
%
% See also PERMUTE, RANDPERM.
% DN 2008-07-30 Wrote it
psychassert(nret<=n,'More return elements requested (nret: %d) than elements in random permutation (n: %d)',nret,n);
[ignore,p] = sort(rand(1,n));
p = p(1:nret);