MATLAB: How to find multiple strings in a cell array

Question

I have a cell array of strings, called Channels, each containing an EEG channel label, e.g. 'A1', 'A2', ….,

I'd like to find indices that correspond to a subset of the strings. For a single string, I've found the following works:

Match=cellfun(@(x) strcmp({'A3'}, x), Channels, 'UniformOutput', 0);r=find(cell2mat(Match))

The value of r is 3, which is what I would expect. However, if I try to find indices that match more than one channel, I obtain an answer I cannot interpret. For example,

Match=cellfun(@(x) strcmp({'A1','A2','A3'}, x), Channels, 'UniformOutput', 0);r=find(cell2mat(Match))

r=1, 5, 9, which is incorrect. The values should be 1, 2, 3.

Answer 1

Try:

Match=cellfun(@(x) ismember(x, {'A1','A2','A3'}), Channels, 'UniformOutput', 0);
r=find(cell2mat(Match));