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unique set from file

Asked by Sanjana Sankar on 29 Jul 2019
Latest activity Commented on by Sanjana Sankar on 29 Jul 2019
I have a .mat file with 14994x31 cells with random alphabets in the cells. I need to find the unique set. I know it is going to be the set of all alphabets only. But I want to find exactly which alphabets are present (if not all). Is the anyway to find out the unique set for the entire file and not just row by row?

  2 Comments

Adam Danz
on 29 Jul 2019
Could you give us an example of the cell array?
'!' 'a:' 'l' 't' '@' [] []
'?' 'a:' 'l' 't' '@' 's' 't'
'/' 'a' 'b' 'a' 'n' 'd' 'A~'
3 different rows

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2 Answers

Adam Danz
Answer by Adam Danz
on 29 Jul 2019
Edited by Adam Danz
on 29 Jul 2019
 Accepted Answer

c = {'!' 'a:' 'l' 't' '@' [] []
'?' 'a:' 'l' 't' '@' 's' 't'
'/' 'a' 'b' 'a' 'n' 'd' 'A~'};
cUnq = unique(c(cellfun(@ischar,c)));
Result
cUnq =
13×1 cell array
{'!' }
{'/' }
{'?' }
{'@' }
{'A~'}
{'a' }
{'a:'}
{'b' }
{'d' }
{'l' }
{'n' }
{'s' }
{'t' }
If you want to keep the unique elements in their original order,
cUnq = unique(c(cellfun(@ischar,c)),'stable');

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Answer by Joel Handy on 29 Jul 2019
Edited by Joel Handy on 29 Jul 2019

c = {'!' 'a:' 'l' 't' '@' [] []
'?' 'a:' 'l' 't' '@' 's' 't'
'/' 'a' 'b' 'a' 'n' 'd' 'A~'};
for rowIdx = 1:size(c,1)
cString(rowIdx) = string([c{rowIdx,:}])
end
uniqueSets = unique(cString)

  1 Comment

Thank you. This also works!!

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