ismember_ordered.m

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function index=ismember_ordered(set1,set2)
% Function operates like index=find(ismember(set1,set2)), except that the output
% is ordered in the sense that index(1) is the index of the element of set1 that
% matches the first element of set2 (if it exists), etc.

if ischar(set2)
  index=find(ismember(set1,set2));
  return
else
  ll=length(set2);
  index=zeros(ll,1);
  kk=1;
  for ii=1:ll
    temp=find(ismember(set1,set2(ii)));
    lt=length(temp);
    if lt > 0
      index(kk:kk+lt-1)=temp;
      kk=kk+lt;
    end
  end
end
index(kk:end)=[];