15-10 Matrices
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)
HP 39gs English.book Page 10 Wednesday, December 7, 2005 11:24 PM
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