MTH 141 Chapter Notes - Chapter 3: Diagonal Matrix, Scalar Multiplication, Matrix Addition
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An example of one, it is called a 2 by 2 , it has 2 rows and 2 columns. G2,1 = second row, first column = 1. 95. The number of rows in the answer is determined by the row in a, and columns in b. ex. Subtraction is the same as addition, you just match the corresponding grid. dimensions. ( a 3x2 and a 2x2) the answer is undefined. Let the first matrix be called a, second be b. (a x b) = ab: multiply each number in first row of a with each number in first column of b. Add these numbers up: multiply the 1st row of a with each number in 2nd,3rd, etc column of b. These numbers will be the first row in the answer: multiply the 2nd , 3rd, etc row of a with the 1st, 2nd, 3rd, etc row of b. Lower case is a vector (b) , upper case is a matrix (v)