ATAN2(2)            Linux Programmer's Manual            ATAN2(2)



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(s), asin(n), atan(n), cos(s), sin(n), tan(n)



                            1993-06-08                   ATAN2(2)