function [X,Y]=shuffleDataSet(X,Y)
% function [X,Y]=shuffle(X,Y)
%
% Shuffle randomly the rows of X. If Y is also supplied
% the rows of Y are shuffled in the same order. X and Y
% may be sparse matrices.
%
% Guy Lebanon, Sept 2003.

p=randperm(size(X,1));
X=X(p,:);
if nargin==2,
  Y=Y(p,:);
end

return;