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ATAN2
Section: Linux Programmer's Manual (3)
Updated: 2002-07-27
Index
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NAME
atan2, atan2f, atan2l - arc tangent function of two variables
SYNOPSIS
#include <math.h>
double atan2(double y, double x);
float atan2f(float y, float x);
long double atan2l(long double y, long double x);
Link with -lm.
DESCRIPTION
The
atan2()
function calculates the arc tangent of the two
variables x and y.
It is similar to calculating the
arc tangent of y / x, except that the signs of both
arguments are used to determine the quadrant of the result.
RETURN VALUE
The
atan2()
function returns the result in radians, which
is between -PI and PI (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),
atan(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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