HP 40G Matrix functions and commands

6.Return to HOME and enter the calculation to left multiply the constants vector by the inverse of the coefficients matrix.

>+20(@>$/3+$@M2 >6+,)7@x –1>[@ >$/3+$@M1

7.Evaluate the calculation.

>(17(5@

The result is a vector of the solutions:

•x = 2

•y = 3

•z = – 2

An alternative method, is to use the RREF function. See “RREF” on page 12-12.

Matrix functions and commands

About functions	• Functions can be used in any aplet or in HOME. They are
	listed in the MATH menu under the Matrix category.
	They can be used in mathematical
	expressions—primarily in HOME—as well as in
	programs.
	• Functions always produce and display a result. They do
	not change any stored variables, such as a matrix
	variable.
	• Functions have arguments that are enclosed in
	parentheses and separated by commas; for example,
	CROSS(vector1,vector2). The matrix input can be either
	a matrix variable name (such as M1) or the actual matrix
	data inside brackets. For example, CROSS(M1,[1,2]).

Matrices 12-9