SINCOS(3) Linux Programmer's Manual SINCOS(3)
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 at-
tributes(7).
+-------------------------------+---------------+---------+
|Interface | Attribute | Value |
+-------------------------------+---------------+---------+
|sincos(), sincosf(), sincosl() | Thread safety | MT-Safe |
+-------------------------------+---------------+---------+
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
cos(3), sin(3), tan(3)
COLOPHON
This page is part of release 5.07 of the Linux man-pages project. A
description of the project, information about reporting bugs, and the
latest version of this page, can be found at
https://www.kernel.org/doc/man-pages/.
GNU 2020-06-09 SINCOS(3)