MATLAB: How to convert a column of cells into string

convert to string

when i try my code ( search for a word in a cells of column), i use :
% search for "battery" in column 52th
B=~cellfun('isempty',regexp(alldata(:,52),'BATTERY'))
i got an error : All cells must be strings.
B=~cellfun('isempty',regexp(alldata(:,52),'BATTERY'))
how i can solve this?
note: the column contain a texts but some cells is empty or contain NaN

Best Answer

NaN is double
>> class( nan )
ans =
double
replace Nan by '' (empty string)
>> alldata = {'abc', nan, 'def'}
alldata = 
    'abc'    [NaN]    'def'
>> alldata{ not( cellfun( @ischar, alldata ) ) } = '';
>> alldata
alldata = 
    'abc'    ''    'def'
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