sincos(3) — Linux manual page

SINCOS(3)               Linux Programmer's Manual              SINCOS(3)

NAME         top

       sincos, sincosf, sincosl - calculate sin and cos simultaneously

SYNOPSIS         top

       #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         top

       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         top

       These functions return void.

ERRORS         top

       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         top

       These functions first appeared in glibc in version 2.1.

ATTRIBUTES         top

       For an explanation of the terms used in this section, see
       attributes(7).

       ┌──────────────────────────────────────┬───────────────┬─────────┐
       │Interface                             │ Attribute     │ Value   │
       ├──────────────────────────────────────┼───────────────┼─────────┤
       │sincos(), sincosf(), sincosl()        │ Thread safety │ MT-Safe │
       └──────────────────────────────────────┴───────────────┴─────────┘

CONFORMING TO         top

       These functions are GNU extensions.

NOTES         top

       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         top

       Before version 2.22, the glibc implementation did not set errno
       to EDOM when a domain error occurred.

SEE ALSO         top

       cos(3), sin(3), tan(3)

COLOPHON         top

       This page is part of release 5.13 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                            2021-03-22                      SINCOS(3)

Pages that refer to this page: cos(3),  sin(3)

Copyright and license for this manual page

HTML rendering created 2021-08-27 by Michael Kerrisk, author of The Linux Programming Interface, maintainer of the Linux man-pages project. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH.