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Lecture 2

# MAT 211 Lecture 2: 4.1 Matrix Addition & Scalar Multiplication Premium

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School
Department
Mathematics
Course
MAT 211
Professor
Mohacsy Hedvig
Semester
Spring

Description
4.1: Matrix Addition & Scalar Multiplication Matrix is a rectangular array of numbers, symbols, expressions arranged in rows and columns • The dimension of this matrix is 2 x 3 (# of rows x # of columns) • Deﬁnition: two matrices A and B are equal if and only if for i and j ◦ (They have to have the same dimensions) Ex. Solve for x, y, z, and w Row Matrix • Dimension 1 x 4 Column Matrix: • Dimension 3 x 1 Square Matrix: • # of rows = # of columns • Dimension n x n Identity Matrix: it is a square matrix with main diagonal entries with all 1's 0
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