Linux manual pages Section 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);
 
[Note] Note

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 attributes(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 5.11 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/.


  Copyright 2002 Walter Harms (walter.harmsinformatik.uni-oldenburg.de)
and Copyright 2008, Linux Foundation, written by Michael Kerrisk
    <mtk.manpagesgmail.com>

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Distributed under GPL
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