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error using unique function

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Danielle Leblanc
Danielle Leblanc 2012-7-26
s is a cell matrix (178000x9) I want to find the unique values of s in the first column. ID=unique(s(:,1));
I received the following error. Error using cell/unique (line 95) Input A must be a cell array of string
what could be the reason?
  1 个评论
Sean de Wolski
Sean de Wolski 2012-7-26
If the first column is all non-numeric it would not be throwing that error. What is returned from:
iscellstr(s(:,1))

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Mike Hosea
Mike Hosea 2012-7-26
编辑：Mike Hosea 2012-7-26
What type of data is in the cell array? When you use UNIQUE on a cell array, the only case that's supported is when the elements of the cell array are strings. Is that case not working for you?
>> c = {'abc','abc','def','defg'}';
>> unique(c(:,1))
ans =
'abc'
'def'
'defg'
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Mike Hosea
Mike Hosea 2012-7-26
Yes, this is what we expected. You do not have a cell array of only strings. You can find the non-strings with
find(cellfun(@(x)~ischar(x),s))
You do not mention where this data came from. If it began as a
s = cell(m,n);
and was later partially populated, then you might resolve the problem by changing that to
s = repmat({''},m,n);
Danielle Leblanc
Danielle Leblanc 2012-7-26
Thanks this solved the problem

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Wayne King
Wayne King 2012-7-26
编辑：Wayne King 2012-7-26
Is it a cell array of numeric values?
You can use cell2mat()
A = {1 5 9 ; 2 3 4; 2 4 5};
B = unique(cell2mat(A(:,1)));

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