
6. Return to Home view and left-multiply the constants vector by the inverse of the coeicients matrix:
2 1
The result is a vector of the solutions: x = 2, y = 3 and z = –2.
An alternative method is to use the RREF function (see the “RREF” section).
Matrix functions and commands
Functions
Functions can be used in any app or in Home view. They are listed on the Math menu under the Matrix
category. They can be used in mathematical expressions—primarily in Home view—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]).
Menu format
By default, a Matrix function is presented on the Math menu using its descriptive name, not its common
command name. Thus the shorthand name TRN is presented as Transpose and DET is presented as
Determinant.
If you prefer the Math menu to show command names instead, deselect the Menu Display option on page 2
of the Home Settings screen.
Commands
Matrix commands dier from matrix functions in that they do not return a result. For this reason, these
functions can be used in an expression and matrix commands cannot. The matrix commands are designed to
support programs that use matrices.
The matrix commands are listed in the Matrix category of the Commands menu in the Program Editor. They
are also listed in the Catalog menu, one of the Toolbox menus. Press
and tap to display the
commands catalog. The matrix functions are described in the following sections of this chapter; the matrix
commands are described in the chapter Programming (see page 544).
532 Chapter 26 Matrices
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