MATLAB: How to find indices of elements but keep the order unchanged

indexing

Hi all,
I have a cell array ch_names of channel names and I would like to get indexes of certain channels that I have given in pickCh. I have done this as follows:
Idx = find(ismember(ch_names,pickCh));
However, this gives the indexes in increasing order. Is there any better way than using a loop to keep the order of the indexes as it is in pickCh?
Thank you already in advance!
Regards, Maria

Best Answer

   [tf,loc] = ismember(ch_names,pickCh);
   [~,p] = sort(loc(tf));
   idx = find(tf);
   idx = idx(p);
(This assumes this are no repetitions in 'pickCh'. Otherwise there is ambiguity as to the proper ordering.)
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