Small Problem with + sign

Matlab complains constantly on the plus or minus sign, why? Here is my problem:

Matlab says:

Error using + Matrix dimensions must agree.

And here is what I wrote:

A=[3 5 2; 2 1 7];

B=[2 1 3; 5 9 0];

>>a=A+B

Answer 1

[Sean de Wolski]

A and B apparently aren't what you think they are!

size(A);
size(B);

or if this is burried somewhere -

dbstop if error

And then run, inspect A, B at the line of failure.

[Regina]

you're right. thanks!