# Simple matlab code issue

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Leora on 16 Sep 2014
Commented: Youssef Khmou on 16 Sep 2014
I have an issue with a very basic code using matrices. I had to define 3 matrices and do a few operations. I got them all correct except for the last one. It says the dimensions don't match but that is what the question is telling me to do. Any help would be appreciated.
A=[1,2,3;4,5,6;7,8,9]; %Defining matrices A,B and C B=[2,8,2;1,1,1;7,0,2]; C=[2;0;1]; A+B A.*B transpose(C)*B inv(A)*(C).^1 B+(C).^2
The last one is incorrect and the question asks me to do B+C^2
Leora on 16 Sep 2014
The error says error using + dimensions must agree

Youssef Khmou on 16 Sep 2014
Edited: Youssef Khmou on 16 Sep 2014
The quantity (C')*B*inv(A)*(C).^1 is scalar, and B+C.^2 is not correct :
B+(C*C').^2;
is correct
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Youssef Khmou on 16 Sep 2014

Hikaru on 16 Sep 2014
B is a 3x3 matrix and C.^2 is a 3x1 matrix. There's no way you can add them. If you want to square matrix C (i.e. C^2), then C has to be a square matrix as well.