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gives

G =
1111
1111

Enter

H=[D;G]

produces

H =
1234
5678
1111
1111

Finally, the command sum applied to a matrix gives a row in which m-ele-
ment is the sum of all the elements of the m column in the original matrix.
th
For example, entering:

sum(H)

produces

ans =
8101214

8.2 Adding Matrices
Adding two matrices is only possible if they have equal numbers of rows and
equal numbers of columns; or, said differently, they both have the same size.
The addition operation is the obvious one. That is, the (m, n) element of the
sum (A+B) is the sum of the (m, n) elements of respectively A and B:

(AB+ ) = A + B (8.2)
mn mn mn

Entering

© 2001 by CRC Press LLC