HP 39gs User Manual page 168

%TOTAL
RAD→DEG
ROUND
SIGN
TRUNCATE
13-16
Example
%CHANGE(20,50) returns 150
Percent total : (100)y/x. What percentage of x, is y.
%TOTAL(x, y)
Example
%TOTAL(20,50) returns 250
Radians to degrees. Converts value from radians to
degrees.
RAD→DEG (value)
Example
RAD→DEG(π) returns 180
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 7.87
ROUND (0.0036757,-3) returns 0.00368
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)
Truncates value to decimal places. Accepts complex
numbers.
TRUNCATE(value, places)
Example
TRUNCATE(2.3678,2) returns 2.36
Using mathematical functions