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.