Matrix addition
2.6
Let A = [aij] and B = [bij] be m ? n matrices. The sum of A and B,
denoted by A+B, is the m ? n matrix that has aij+bij as its (i,j)th element.
In other words, A+B=[aij+bij].
3 0 7 2 8 -5 5 8 2
2 -2 2 + 0 2 2 = 2 0 4
6 1 -3 1 1 0 7 2 -3
A+B is defined only when A and B have the same size!
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