sinp(3M)sinp(3M)NAME
sinp, sinpf, sinpl, cosp, cospf, cospl, tanp, tanpf, tanpl, sincosp,
sincospf, sincospl, asinp, asinpf, asinpl, acosp, acospf, acospl,
atanp, atanpf, atanpl - trigonometric functions with floating-point
period
SYNOPSIS
cc [ flag ... ] file ... -lsunmath -lm [ library ... ]
#include <sunmath.h>
double sinp(double x);
float sinpf(float x);
long double sinpl(long double x);
double cosp(double x);
float cospf(float x);
long double cospl(long double x);
double tanp(double x);
float tanpf(float x);
long double tanpl(long double x);
void sincosp(double x, double *s, double *c);
void sincospf(float x, float *s, float *c);
void sincospl(long double x, long double *s, long double *c);
double asinp(double x);
float asinpf(float x);
long double asinpl(long double x);
double acosp(double x);
float acospf(float x);
long double acospl(long double x);
double atanp(double x);
float atanpf(float x);
long double atanpl(long double x);
DESCRIPTIONsinp(x), cosp(x), and tanp(x) compute trigonometric functions scaled to
have period 2*PI, where PI is the best floating-point approximation to
pi: sinp(x) := sin(x * pi/PI), and similarly for cosp(x) and tanp(x).
The double functions sinp, cosp, and tanp use the best double precision
approximation to pi. The float functions sinpf, cospf, and tanpf use
the best single precision approximation to pi. The long double func‐
tions sinpl, cospl, and tanpl use the best quadruple precision approxi‐
mation on SPARC and the best extended double precision approximation on
x86. For large arguments, these functions may be faster than the stan‐
dard trigonometric functions with period 2pi, but they are not as fast
as the trigonometric functions scaled by pi described in sinpi(3M).
sincosp(x, s, c) simultaneously sets *s = sinp(x) and *c = cosp(x).
The corresponding inverse functions ostensibly compute asinp(x) :=
asin(x) * PI/pi, and similarly for acosp(x) and atanp(x), but since
PI/pi is within a unit in the last place of 1, these functions actually
just return the unscaled values asin(x), acos(x), and atan(x), respec‐
tively.
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
┌────────────────────┬─────────────────┐
│ ATTRIBUTE TYPE │ ATTRIBUTE VALUE │
├────────────────────┼─────────────────┤
│Interface Stability │ Committed │
│MT-Level │ MT-Safe │
└────────────────────┴─────────────────┘
SEE ALSOasin(3M), acos(3M), atan(3M), cos(3M), sin(3M), sincos(3M), tan(3M),
sind(3M), sinpi(3M), attributes(5)
14 Mar 2009 sinp(3M)