HP 40gs hp 40gs_user's guide_English_E_HDPMSG40E07A.pdf - Page 171
Two-variable statistics, Symbolic functions
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hp40g+.book Page 17 Friday, December 9, 2005 1:03 AM TRUNCATE XPON Examples SIGN (-2) returns -1 SIGN((3,4)) returns (.6,.8) Truncates value to decimal places. Accepts complex numbers. TRUNCATE(value, places) Example TRUNCATE(2.3678,2) returns 2.36 Exponent of value. XPON(value) Example XPON(123.4) returns 2 Two-variable statistics These are functions for use with two-variable statistics. See "Two-variable" on page 10-15. Symbolic functions The symbolic functions are used for symbolic manipulations of expressions. The variables can be formal or numeric, but the result is usually in symbolic form (not a number). You will find the symbols for the symbolic functions = and | (where) in the CHARS menu ( CHARS) as well as the MATH menu. = (equals) Sets an equality for an equation. This is not a logical operator and does not store values. (See "Test functions" on page 13-19.) expression1 = expression2 ISOLATE Isolates the first occurrence of variable in expression=0 and returns a new expression, where variable=newexpression. The result is a general solution that represents multiple solutions by including the (formal) variables S1 to represent any sign and n1 to represent any integer. ISOLATE(expression, variable) Using mathematical functions 13-17