How to find indices of elements but keep the order unchanged?

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Maria
Maria 2014-9-6
评论： ibrahim Salim 2018-2-8
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

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采纳的回答

Roger Stafford
Roger Stafford 2014-9-6
[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.)
  1 个评论
ibrahim Salim
ibrahim Salim 2018-2-8
Hello, I used this code but I'v changed the first line with : [tf,loc] = cellfun(@(subc) ismember(pickCh, subc,'rows'), ch_names); to seek about a specific row. This line was slow. could you please help me to speed up run time by using the same command or another one.
Thanks

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更多回答（1 个）

Maria
Maria 2014-9-6
Thanks a lot! This seems to work.
-Maria

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