Textbook: “Matrix algebra useful for statistics”, Searle

Section 1. Introduction and Matrix Operations. Definition of matrix: An matrix A is a rectangular array of rc real numbers arranged in r horizontal rows and c vertical columns:. The i’th row of A is , and the j’th column of A is. We often write A as . Matrix addition: Let ,,. Then,, and the transpose of A is denoted as . Example 1: Let ... ................
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