atan2

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)



                                  1993-06-08                          ATAN2(3)