Page 442 - Schaum's Outline of Theory and Problems of Signals and Systems

APP. A] REVIEW OF MATRIX THEORY 429

5. The idenrity (or unit) matrix I is a diagonal matrix with all of its diagonal elements
equal to 1.

B. Operations:
Let A = [aijlmxn, = [biilmxn, and C = [C~~I,,,.
B
a. Equality of Two Matrices:
A= B=,a..=b..
IJ 11
b. Addition:

C = A + B =s cij = aij + bij

c. Multiplication by a Scalar:
B = aA =s bij = aaij

If a = - 1, then B = - A is called the negative of A.

EXAMPLE A.l Let

Then

Notes:

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