/usr/share/psychtoolbox-3/PsychProbability/RandSel.m is in psychtoolbox-3-common 3.0.9+svn2579.dfsg1-1.
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1 2 3 4 5 6 7 8 9 10 | function sel = RandSel(in,n)
% sel = RandSel(in,n)
% randomly selects N elements from set IN, elements are replenished.
% IN can have any number of dimensions and elements
% DN 2008 wrote it
% 2008-08-06 Updated it to support n selections from set
selind = ceil(RandLim([1,n],0,numel(in)));
sel = in(selind);
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