# sn_3a - Math 1313 ONLINE Week 3 Session One Notes...

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Math 1313 ONLINE Week 3 Session One Notes Instructor: Dianne L. Gross Email: [email protected] Course Website: . Click on the link to Math 1313. CASA Website: www. casa.uh.edu Section 3.1 Definition of a matrix (plural matrices) is a rectangular array of numbers, letters, symbols or algebraic expressions that are arranged in rows and columns. Capital letters of the English alphabet are usually used to name a matrix. Given--π-=73.394911x8AEach number, letter, symbol or algebraic expression in a matrix is called an element. Each element has a specific location denoted by ija, where the i is the row and j is the column number. For example °±²would be the element −4Example 1: Identify the following elements using the given matrices. . ---=21510848145B=45.10CD=-0142a.³±±b.´²±c.µ¶¶d.µ¶²
Matrix Dimension or Size The dimension of a matrix is determined by the number of rows by the number of columns. Example: []321is a 1 x 3 matrix 456is a 3 x 1 matrix Remember rows x columns. This will be important when doing matrix operations.