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Unformatted text preview: Section 2.4 Matrices 1 Section 2.4 - Matrices A matrix is an ordered rectangular array of numbers. A matrix with m rows and n columns has size or dimension n m . The entry in the i th row and j th column is denoted by ij a . The real numbers that make up the matrix are called entries or elements of the matrix. Example 1: Given ---- = 11 3 1 20 10 9 3 5 7 7 2 A , a. what is the dimension of A ? b. identify 33 a . A matrix with only one column or one row is called a column matrix (or column vector ) or row matrix (or row vector ), respectively. Example: = 5 4 2 A , ( 29 9 1 = B A square matrix is a matrix having the same number of rows as columns. Example: 1 4 9 3 Addition and Subtraction of Matrices If A and B are two matrices of the same dimension, 1. The sum A + B is the matrix obtained by adding the corresponding entries in the two matrices....
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