HP 40gs hp 40gs_user's guide_English_E_HDPMSG40E07A.pdf - Page 324

hp40g+.book Page 10 Friday, December 9, 2005 1:03 AM Matrix functions and commands About functions About commands • 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]). Matrix commands are listed in the CMDS menu ( CMDS), in the matrix category. See "Matrix commands" on page 21-24 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) 18-10 Matrices