sincos(3) — Linux manual page


sincos(3)               Library Functions Manual               sincos(3)

NAME         top

       sincos, sincosf, sincosl - calculate sin and cos simultaneously

LIBRARY         top

       Math library (libm, -lm)

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);

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.

ATTRIBUTES         top

       For an explanation of the terms used in this section, see
       │ Interface                           Attribute     Value   │
       │ sincos(), sincosf(), sincosl()      │ Thread safety │ MT-Safe │

STANDARDS         top


HISTORY         top

       glibc 2.1.

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 glibc 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

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Linux man-pages 6.9.1          2024-05-02                      sincos(3)

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