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Find numeric columns in a cell array

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Sergio Rossi
Sergio Rossi 2014-7-3
评论： Bilirubin 2018-9-19
Hi,
I would like to use gplotmatrix on a dataset data, which contains mixed data (numeric and strings). However, gplotmatrix works on numeric data, so I need to convert my dataset to a matrix. As far as I understand, the only way is to do this is by
C=dataset2cell(data)
X=cell2mat(C)
However, the second command doesn't work, because C contains non-numeric columns. Is there a way to find which columns of a cell array contains only numbers? Thanks a lot,
Sergio

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采纳的回答

Jos (10584)
Jos (10584) 2014-7-3
% C is a cell array, like
C = {1 2 3 4 5 ; 11 '12' 13:15 14 []}
q = cellfun(@(x) isnumeric(x) && numel(x)==1, C) % true for elements of C that are numerical scalars
IsAllNum = all(q,1) % true for columns of C that have only numerical scalars
X = cell2mat(C(:,IsAllNum)) % select and convert
  1 个评论
Bilirubin
Bilirubin 2018-9-19
Does anyone know why isnan gives an error msg?
C = {1 2 3 4 5 ; 11 '12' 13:15 14 []}
q = cellfun(@(x) isnan(x) && numel(x)==1, C) % true for elements of C that are numerical scalars

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更多回答（1 个）

Pascal
Pascal 2014-7-3
If you know whole columns are either numeric or not,
cell2mat(C(:,find(cellfun(@isnumeric, C(1,:)))))

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