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- NAME
- #include <libraries/mathffp.h>
#include <aros/libcall.h>
#include <proto/mathffp.h>
#include <proto/mathtrans.h>
#include <proto/exec.h>
#include <exec/types.h>
float SPSin ()
- SYNOPSIS
- float fnum1
- FUNCTION
- Calculate the sine of a given FFP number in radians
- INPUTS
- fnum1
- Motorola fast floating point number
- RESULT
- Motorola fast floating point number
flags:
zero : result is zero
negative : result is negative
overflow : 0
- NOTES
-
- EXAMPLE
- BUGS
-
- SEE ALSO
- MathTrans
- INTERNALS
- Algorithm for Calculation of sin(y):
z = floor ( |y| / pi );
y_1 = |y| - z * pi; => 0 <= y_1 < pi
if (y_1 > pi/2 ) then y_1 = pi - y_1;
=> 0 <= y_1 < pi/2
Res = y - y^3/3! + y^5/5! - y^7/7! + y^9/9! - y^11/11! =
= y(1+y^2(-1/3!+y^2(1/5!+y^2(-1/7!+y^2(1/9!-1/11!y^2)))));
if (y < 0)
Res = -Res;
if (z was an odd number)
Res = -Res;
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