# Error to applying ismember for cell arrays

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Farshid Daryabor on 18 Feb 2020
Commented: Farshid Daryabor on 18 Feb 2020
I really thanks in advance any help. I am trying to use the below command to find any variable from the A member of the B, but encountering with the error. Welcome any suggestion.
[~,JINDX] = cellfun(@(x)(ismember(B,x)),A,'Uni',false);
Error using cell/ismember (line 34)
Input A of class cell and input B of class char must be cell arrays of strings, unless one is a string.
Error in @(x)(ismember(B,x))
34 error(message('MATLAB:ISMEMBER:InputClass',class(a),class(b)));

#### 1 Comment

Stephen Cobeldick on 18 Feb 2020
It is not clear what you expect. Cell array A contains Rx1 character arrays,e.g.:
>> A{1}
ans =
6
9
0
0
8
0
5
while cell array B contains scalar numerics (which would be much better store in once numeric array):
>> B{1}
ans = 6900805
Do you expect that Rx1 character vector to be equivalent to that numeric scalar? For example:
>> Anum = str2double(cellfun(@(v)v(:).',A,'uni',0));
>> Bnum = [B{:}];
>> idx = ismember(Bnum,Anum)
idx =
1 0 0 0 0 0 0 0 0 0

KSSV on 18 Feb 2020
N = length(A) ;
A1 =zeros(N,1) ;
for i = 1:N
A1(i) = str2num(A{i}') ;
end
B1 = cell2mat(B)' ;
[c,ia] = ismemebr(A1,B1) ;

Farshid Daryabor on 18 Feb 2020
Dear KSSV,
the problem is when I want to use ia as index to find the corresponding variable,
>> C = D(ia);
Subscript indices must either be real positive integers or logicals.
KSSV on 18 Feb 2020
Show us the whole code...in the give answer
A1(c)
works fine.
Farshid Daryabor on 18 Feb 2020
great, it's work to me also. Thanks