[C.16] Identity Matrix

In this calculator skill lesson, you will learn how to generate an identity matrix on your graphing calculator, and how to use it in various calculations. The identity matrix is a square matrix with ones on the diagonal and zeros everywhere else. By multiplying a matrix by the identity matrix, you will get the same matrix back, as long as the identity matrix is the same dimension. This is a useful tool in Input/Output analysis and other mathematical calculations.

Learn how to generate and use an Identity matrix on a graphing calculator (for example, in Input/Output analysis) (MATRIX/MATH/Identity).

• What is an identity matrix and how do you generate an identity matrix on a TI graphing calculator?
• How can you make a TI graphing calculator generate an identity matrix of specified dimensions for you?
• What does the MATH > identity function do on a TI graphing calculator?