Graphics Programs Reference
In-Depth Information
EXAMPLE A6
Evaluate the matrix product AB , where A is given in Example A4 and
4
1
B
=
1
4
2
2
Solution
a 1 ·
b 1
a 1 ·
b 2
AB
=
a 2 ·
b 1
a 2 ·
b 2
a 3 ·
b 1
a 3 ·
b 2
⎦ =
+
+
+
+
1(
4)
2(1)
3(2) 1(1)
2(
4)
3(
2)
4
13
=
1(
4)
+
2(1)
+
1(2) 1(1)
+
2(
4)
+
1(
2)
0
9
0(
4)
+
1(1)
+
2(2)0 1)
+
1(
4)
+
2(
2)
5
8
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