Homework SourseExample Let E21 1 0 0 2 1 0 0 0 1 a What kind of condition
Example: Let E21 = [1 0 0 -2 1 0 0 0 1]. (a) What kind of condition does a matrix B have to satisfy so that we can compute E21 B? (b) Describe in words what multiplying E21 to B, from the left, does to B? ![Example: Let E21 = [1 0 0 -2 1 0 0 0 1]. (a) What kind of condition does a matrix B have to satisfy so that we can compute E21 B? (b) Describe in words what mu](/WebImages/12/example-let-e21-1-0-0-2-1-0-0-0-1-a-what-kind-of-condition-1012738-1761522950-0.webp "Example: Let E21 = [1 0 0 -2 1 0 0 0 1]. (a) What kind of condition does a matrix B have to satisfy so that we can compute E21 B? (b) Describe in words what mu")
Solution
(a) number of columns of E_{21} should be equal to number of rows of B in order to compute product of two matrices.
(b) Number of columns of E_{21} should be equal to number of rows of B
