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ATAN
Section: Linux Programmer's Manual (3)
Updated: 2002-07-27
Index
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NAME
atan, atanf, atanl - arc tangent function
SYNOPSIS
#include <math.h>
double atan(double x);
float atanf(float x);
long double atanl( long double x);
Link with -lm.
DESCRIPTION
The
atan()
function calculates the arc tangent of x; that is
the value whose tangent is x.
RETURN VALUE
The
atan()
function returns the arc tangent in radians and the
value is mathematically defined to be between -PI/2 and PI/2
(inclusive).
CONFORMING TO
SVr4, POSIX.1-2001, 4.3BSD, C89.
The
float
and
long double
variants are C99 requirements.
SEE ALSO
acos(3),
asin(3),
atan2(3),
carg(3),
catan(3),
cos(3),
sin(3),
tan(3)
COLOPHON
This page is part of release 3.05 of the Linux
man-pages
project.
A description of the project,
and information about reporting bugs,
can be found at
http://www.kernel.org/doc/man-pages/.
Index
- NAME
-
- SYNOPSIS
-
- DESCRIPTION
-
- RETURN VALUE
-
- CONFORMING TO
-
- SEE ALSO
-
- COLOPHON
-
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