Introduction to Matrices

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Presentation transcript:

Introduction to Matrices AQR

A matrix is an array of numbers. The rows are the grades of each student. The columns are the designated assignments The dimensions of a matrix are # of rows by # of columns

So a “10×20” matrix means 10 rows and 20 columns So a “10×20” matrix means 10 rows and 20 columns. What are the dimensions of Dr. Snape’s grade book matrix?

Adding & Subtracting Matrices To add or subtract matrices both matrices must have the same dimensions.

Scalar Multiplication When you multiply a matrix by a number.