NAME
sincos, sincosf, sincosl - calculate sin and cos simultaneously
SYNOPSIS
#define
_GNU_SOURCE /* See feature_test_macros(7) */
#include <math.h>
void
sincos(double x, double *sin,
double *cos);
void sincosf(float x, float
*sin, float *cos);
void sincosl(long double x, long double
*sin, long double *cos);
Link with -lm.
DESCRIPTION
Several applications need sine and cosine of the same angle x. These functions compute both at the same time, and store the results in *sin and *cos. Using this function can be more efficient than two separate calls to sin(3) and cos(3).
If x is a NaN, a NaN is returned in *sin and *cos.
If x is positive infinity or negative infinity, a domain error occurs, and a NaN is returned in *sin and *cos.
RETURN VALUE
These functions return void.
ERRORS
See math_error(7) for information on how to determine whether an error has occurred when calling these functions.
The following
errors can occur:
Domain error: x is an infinity
errno is set to EDOM (but see BUGS). An invalid floating-point exception (FE_INVALID) is raised.
VERSIONS
These functions first appeared in glibc in version 2.1.
ATTRIBUTES
For an explanation of the terms used in this section, see attributes(7).
CONFORMING TO
These functions are GNU extensions.
NOTES
To see the performance advantage of sincos(), it may be necessary to disable gcc(1) built-in optimizations, using flags such as:
cc -O -lm -fno-builtin prog.c
BUGS
Before version 2.22, the glibc implementation did not set errno to EDOM when a domain error occurred.
SEE ALSO
COLOPHON
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