ATAN2(3)            Linux Programmer's Manual            ATAN2(3)

NAME
       atan2 - arc tangent function of two variables

SYNOPSIS
       #include <math.h>

       double atan2(double y, double x);

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
       SVID 3, POSIX, BSD 4.3, ISO 9899

SEE ALSO
       acos(3), asin(3), atan(3), cos(3), sin(3), tan(3)

                           June 8, 1993                         1