Newbie to Matlab: How to find duplicates within a cell of arrays, arrays have varying sizes
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Hi,
I have a 100 x 1 cell containing arrays of varying length from 5 to 8. Here's an example:
A = [1x7 double] [1x6 double] [1x6 double] [1x7 double] [1x5 double]
Each of these arrays looks something like [1 5 20 12 25 27 1]. Is there a fast way to identify any duplicates within the entire cell and delete them so you're left with only unique arrays? I've been searching on this site but can't seem to find a way to deal with varying length arrays.
Thank you so much for your help!
Newbie to Matlab
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Teja Muppirala
le 15 Nov 2011
Here is a one rather exotic way of doing it:
% Step 1: Convert to strings
Aunique = cellfun(@(x)char(typecast(x,'uint8')), A, 'unif',0);
% Step 2: Call the UNIQUE command
Aunique = unique(Aunique);
% Step 3: Reconvert to doubles
Aunique = cellfun(@(x) typecast(uint8(x),'double'),Aunique,'unif',0)
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Walter Roberson
le 15 Nov 2011
A( any(triu(bsxfun(@isequal, A, A.'),1)) ) = [];
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Walter Roberson
le 15 Nov 2011
There might be a version difference: the current documentation does indicate that cells are allowed.
You could use
A( any(triu(0+bsxfun(@(J,K) isequal(A{J},A{K}), (1:length(A)).', 1:length(A)),1)) ) = [];
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