# Operator '.*' is not supported for operands of type 'cell'.

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Gözde Üstün on 9 Jul 2020
Commented: Image Analyst on 10 Jul 2020
Hello,
I am getting this error: Operator '.*' is not supported for operands of type 'cell'.
Here my code:
for a=1:m %d->m
for b=1:m %d->m
for x=1:m
for y=1:m
BO=BO+B(a,b,x,y).*(kron(A_ax(:,:,x,a),B_by(:,:,y,b))); %this is the Bell operator
end
end
end
end
And b is coming from other code. I am converting it:
B=T(:,:,:,:);
B=cell2mat(B);
I really dont understand why I have this error and how I can solve it

Matt J on 9 Jul 2020
Edited: Matt J on 9 Jul 2020
Well, you need to check whether B is a cell array or not (it almost certainly is). Did your call to cell2mat work?

Gözde Üstün on 10 Jul 2020
B is a cell array now
Matt J on 10 Jul 2020
Well, that explains everything. Multiplication with a cell array will not work
>> {2}.*3
Undefined operator '.*' for input arguments of type 'cell'.
Image Analyst on 10 Jul 2020
Hopefully after you read the FAQ, you'll have a better idea of what a cell array is, how it works, and how to use it: FAQ : What is a cell array? And you'll learn when to use braces, when to use parentheses, and when to use brackets.

Image Analyst on 9 Jul 2020
If B is a cell array, try B{a,b,x,y} instead of B(a,b,x,y) to get the contents of the cell.

#### 1 Comment

Gözde Üstün on 10 Jul 2020
B is a cell array because when I tried to convert it, I am getting this error:
Dimensions of arrays being concatenated are not consistent.
Error in cell2mat (line 118)
ct{mref{:}} = cat(cdim+1,c{mref{:},:});

R2020a

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