sincos(3) - Linux manual page (original) (raw)

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)](../man3/sin.3.html) and [cos(3)](../man3/cos.3.html).

   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)](../man7/math%5Ferror.7.html) 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](../man3/errno.3.html)_ 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
   [attributes(7)](../man7/attributes.7.html).
   ┌──────────────────────────────────────┬───────────────┬─────────┐
   │ **Interface** │ **Attribute** │ **Value** │
   ├──────────────────────────────────────┼───────────────┼─────────┤
   │ **sincos**(), **sincosf**(), **sincosl**()       │ Thread safety │ MT-Safe │
   └──────────────────────────────────────┴───────────────┴─────────┘

STANDARDS top

   GNU.

HISTORY top

   glibc 2.1.

NOTES top

   To see the performance advantage of **sincos**(), it may be necessary
   to disable [gcc(1)](../man1/gcc.1.html) 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](../man3/errno.3.html)_ to
   **EDOM** when a domain error occurred.

SEE ALSO top

   [cos(3)](../man3/cos.3.html), [sin(3)](../man3/sin.3.html), [tan(3)](../man3/tan.3.html)

COLOPHON top

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Linux man-pages 6.10 2024-07-23 sincos(3)

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