sincosl(3) Linux Man Page - System Grab Bag

Name

sincos, sincosf, sincosl - calculate sin and cos simultaneously

Library

Math library ( libm ", " -lm )

Synopsis

"#define(7)_GNU_SOURCE" "         /* See feature_test_macros */" #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). allbox; lbx lb lb T{ sincos()sincosf()sincosl()

Interface	Attribute	Value
T}	Thread safety	MT-Safe

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.