HP 39GS hp 39gs_user's guide_English_E_HDPMG39AE13.pdf - Page 168
Total, Round, Truncate, Example
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%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