HP 39g Graphing Calculator - Manual (Page 153)

Real-number functions
CEILING
DEG-^RAD
FLOOR
FNROOT
FRAC
Some real-number functions can also take complex
arguments.
Smallest integer greater than or equal to value.
CEILING(vflfe(?)
Examples
CEILING ( 3 . 2 ) returns 4
C E I L I N G ( - 3 . 2 ) returns -3
Degrees to radians. Converts value from Degrees angle
format to Radians angle format.
DEG^RAD(vafee)
Example
DEG^RADdSO) returns 3.14159265359, the
value of 71.
Greatest integer less than or equal to value.
FLOOR(va/«e)
Example
FLOOR ( - 3 . 2 ) returns -4
Function root-finder (like the Solve aplet). Finds the value for
the given variable at which expre.ssion most nearly evaluates
to zero. Uses guess as initial estimate.
FNROOT(expreij;o«, variable, guess)
Example
F N R O O T ( M * 9 . 8 / 5 0 0 - 1 , M , l ) returns
6 1 . 2 2 4 4 8 9 7 9 5 9 .
Fractional part.
FRAC(va/«e)
Example
FRAG (23.2) returns . 2
Using mathematical functions 10-15