# Input A of class cell and input B of class cell must be cell arrays of character vectors, unless one is a character vector.

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Ioannis Vourvachakis on 5 Nov 2021
Commented: Stephen23 on 6 Nov 2021
I have a cell array A
2×1 cell array
{}
{}
and I have a cell array B, that is a 1×6 cell array.
In B,
B{:,6} contains the below elements
2×1 cell array
{}
{}.
I want to use ismember, to extract the value 321, that it is contaιnes in both arrays.
If I try ismember(A,B{:,6}),
it sais error because Input A of class cell and input B of class cell must be cell arrays of character vectors, unless one is a character vector.
What can I do?
Thank you very much.
##### 2 CommentsShowHide 1 older comment
Stephen23 on 6 Nov 2021

Stephen23 on 5 Nov 2021
Edited: Stephen23 on 5 Nov 2021
Why are you inefficiently storing scalar numerics in cell arrays?
Using numeric arrays would be much simpler and avoid this error.
"I want to use ismember, to extract the value 321, that it is contaιnes in both arrays."
If the goal is really to get the common members, why not just use INTERSECT? (which once again, is much easier with numeric arrays).
Given that inefficent data:
A = {321,640}
A = 1×2 cell array
{} {}
B = [cell(2,5),{321;278}]
B = 2×6 cell array
{0×0 double} {0×0 double} {0×0 double} {0×0 double} {0×0 double} {} {0×0 double} {0×0 double} {0×0 double} {0×0 double} {0×0 double} {}
C = intersect([A{:}],[B{:,6}])
C = 321
or
X = ismember([A{:}],[B{:,6}])
X = 1×2 logical array
1 0
D = A(X)
D = 1×1 cell array
{}

Matt J on 5 Nov 2021
Edited: Matt J on 5 Nov 2021
It is puzzling that A and B are cell arrays when they could easily just be vectors. Nevertheless, they can be converted with cell2mat:
ismember(cell2mat(A),cell2mat(B{6}))