| Domain error: x is an infinity | errno is set to EDOM (but see BUGS). An invalid floating-point exception (FE_INVALID) is raised. |
NAME
sincos, sincosf, sincosl - calculate sin and cos simultaneously
LIBRARY
Math library (libm, -lm)
SYNOPSIS
#define _GNU_SOURCE\n /* See feature_test_macros(7) */
\n#include <math.h>void sincos(double \nx\n, double *\nsin\n, double *\ncos\n);\n
\nvoid sincosf(float \nx\n, float *\nsin\n, float *\ncos\n);\n
\nvoid sincosl(long double \nx\n, long double *\nsin\n, long double *\ncos\n);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.
ATTRIBUTES
For an explanation of the terms used in this section, see attributes(7).
| Interface | Attribute | Value |
| sincos (), sincosf (), sincosl () | Thread safety | MT-Safe |
STANDARDS
GNU.
HISTORY
glibc 2.1.
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.cBUGS
Before glibc 2.22, the glibc implementation did not set errno to EDOM when a domain error occurred.
SEE ALSO
cos(3), sin(3), tan(3)