SINCOS
Section: Linux Programmer's Manual (3)
Updated: 2021-03-22
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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);
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/.
Index
- NAME
-
- SYNOPSIS
-
- DESCRIPTION
-
- RETURN VALUE
-
- ERRORS
-
- VERSIONS
-
- ATTRIBUTES
-
- CONFORMING TO
-
- NOTES
-
- BUGS
-
- SEE ALSO
-
- COLOPHON
-
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Time: 06:22:48 GMT, May 09, 2021