SINPI 3CW "12 December 2007" "mathcw-1.00"

Table of contents


NAME

sinpif, sinpi, sinpil, sinpiw, sinpiq, sinpill, sinpidf, sinpid, sinpidl, sinpidll - sine function

SYNOPSIS

cc [ flags ] -I/usr/local/include file(s) -L/usr/local/lib -lmcw [ ... ]

#include <mathcw.h>

extern float sinpif (float x);

extern double sinpi (double x);

extern long double sinpil (long double x);

extern __float80 sinpiw (__float80 x);

extern __float128 sinpiq (__float128 x);

extern long_long_double sinpill (long_long_double x);

extern decimal_float sinpidf (decimal_float x);

extern decimal_double sinpid (decimal_double x);

extern decimal_long_double sinpidl (decimal_long_double x);

extern decimal_long_long_double sinpidll (decimal_long_long_double x);

NB: Functions with prototypes containing underscores in type names may be available only with certain extended compilers.


DESCRIPTION

Compute the sine of x, where the argument is measured in units of pi. Thus, sinpi(x) = sin(pix). Unlike the normal sine function, the argument is reduced exactly to the interval [-1,+1] by
r = modf(0.5 * x, NULL).
The function value is then sin(pir).

RETURN VALUES

If the argument is finite, its sine is returned. Otherwise, a NaN is returned.

ERRORS

If the argument is a NaN, errno is set to EDOM, and the argument is returned. If the argument is +Infinity or -Infinity, errno is set to EDOM, and a quiet NaN is returned.

SEE ALSO

acos(3CW), acosp(3CW), acospi(3CW), asin(3CW), asinp(3CW), asinpi(3CW), atan(3CW), atan2(3CW), atan2p(3CW), atan2pi(3CW), atanp(3CW), atanpi(3CW), cos(3CW), cosp(3CW), cospi(3CW), cotan(3CW), cotanp(3CW), cotanpi(3CW), sin(3CW), sincos(3CW), sincosp(3CW), sincospi(3CW), sinp(3CW), tan(3CW), tanp(3CW), tanpi(3CW).