HP 39gs Graphing Matrix functions and commands, Argument conventions, About functions, Colnorm

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]).
About commands	Matrix commands are listed in the CMDS menu (
	CMDS), in the matrix category.
	See “Matrix commands” on page 18-24 for details of the
	matrix commands available for use in programming.
	Functions differ from commands in that a function can be
	used in an expression. Commands cannot be used in an
	expression.

Argument conventions

•For row# or column#, supply the number of the row (counting from the top, starting with 1) or the number of the column (counting from the left, starting with 1).

•The argument matrix can refer to either a vector or a matrix.

Matrix functions

COLNORM	Column Norm. Finds the maximum value (over all
	columns) of the sums of the absolute values of all elements
	in a column.
	COLNORM(matrix)

15-10 Matrices