/usr/share/psychtoolbox-3/PsychProbability/RandDim.m is in psychtoolbox-3-common 3.0.11.20140816.dfsg1-1.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 | function mat = RandDim(in,dim)
% mat = RandDim(in,dim)
% randomizes dimension DIM of matrix IN
% IN can have any number of dimensions
%
% DN 2008 Wrote it
dimsize = size(in,dim);
if dimsize==1 || dim>ndims(in)
mat = in;
return;
end
v(1:ndims(in)) = {':'}; % Create the index that will transform x. a(':') works just as well as a(:)
v{dim} = randperm(dimsize); % Throw in random order indices for the dim-to-be-randomized.
mat = in(v{:}); % Use this indexing cell
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