# How to solve Conversion to cell from double is not possible.

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Nora Khaled on 29 Aug 2017
Commented: Nora Khaled on 30 Aug 2017
I am trying to create an array named actOld using this code
for i=1:nPlayers
actOld(i)=randi(3);
end
and the error message " Conversion to cell from double is not possible. , actOld(i)=randi(3);" appears.
Well I don't see how it is a cell array at the moment. It appears to be a numeric array that is sub-optimally growing in a loop.
Nora Khaled on 30 Aug 2017
thank you all.

Fangjun Jiang on 29 Aug 2017
Edited: Fangjun Jiang on 29 Aug 2017
Your variable actOld must be cell. Check it using class(actOld);
>> actOld=cell(5,1);
>> actOld(1)=randi(3)
Conversion to cell from double is not possible.
Use actOld{i}=randi(i) if that is what you want.
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Walter Roberson on 29 Aug 2017
If you need to be able to assign an entire vector to act(j) where j is a scalar, then you will need to create a new Vector object class and define appropriate indexing and mathematical operations for it. When you have act(j) with scalar j then that is notation for referring to a scalar.
If I recall correctly, someone put a vector class into the File Exchange.
find(act==k)
As you want act to be a vector of vectors, and as k is a scalar there will be no places where the vector act(j) is equal to the scalar k.
Nora Khaled on 30 Aug 2017
thank you all.

Jan on 29 Aug 2017
You do not need a vector class or a cell array. The problem can be solved with numerical arrays directly:
actOld = randi(3, 3, nPlayers);
No need for a loop. Accessing the sub matrices works easy and efficient. So there is potential to simplify the code and fix the problem at the same time.
Nora Khaled on 30 Aug 2017
thank you.