ATAN2(3) NEWLIB ATAN2(3)NAME
1.8 `atan2', `atan2f'--arc tangent of y/x
SYNOPSIS
#include <math.h>
double atan2(double Y,double X);
float atan2f(float Y,float X);
DESCRIPTION
`atan2' computes the inverse tangent (arc tangent) of Y/X. `atan2'
produces the correct result even for angles near pi/2 or -pi/2 (that
is, when X is near 0).
`atan2f' is identical to `atan2', save that it takes and returns
`float'.
RETURNS
`atan2' and `atan2f' return a value in radians, in the range of -pi to
pi.
You can modify error handling for these functions using `matherr'.
PORTABILITY
`atan2' is ANSI C. `atan2f' is an extension.
SEE ALSO
atan2 is part of the library. The full documentation for is maintained
as a Texinfo manual. If info and are properly installed at your site,
the command
info
will give you access to the complete manual.
NEWLIB April 2010 ATAN2(3)