Man page - sincos(3)

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Manual

sincos

NAME
LIBRARY
SYNOPSIS
DESCRIPTION
RETURN VALUE
ERRORS
ATTRIBUTES
STANDARDS
HISTORY
NOTES
BUGS
SEE ALSO

NAME

sincos, sincosf, sincosl - calculate sin and cos simultaneously

LIBRARY

Math library ( libm , -lm )

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 );

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).

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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.c

BUGS

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)