HP 39g+ Graphing manual Two-variable statistics, Round, Sign, Truncate, Xpon

ROUND	Rounds value to decimal places. Accepts complex
	numbers.
	ROUND(value, places)
	Round can also round to a number of significant digits as
	showed in example 2.
	Examples
	ROUND(7.8676,2) returns 7.68
	ROUND (0.0036757,-3) returns 0.00368
SIGN	Sign of value. If positive, the result is 1. If negative, –1. If
	zero, result is zero. For a complex number, this is the unit
	vector in the direction of the number.
	SIGN(value)
	SIGN((x, y))
	Examples
	SIGN (–2) returns –1
	SIGN((3,4)) returns (.6,.8)
TRUNCATE	Truncates value to decimal places. Accepts complex
	numbers.
	TRUNCATE(value, places)
	Example
	TRUNCATE(2.3678,2) returns 2.36
XPON	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 8-14.

11-16 Using mathematical functions