atan2l

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



NAME
       atan2, atan2f, atan2l - arc tangent function of two variables

SYNOPSIS
       #include <math.h>

       double atan2(double y, double x);

       float atan2f(float y, float x);

       long double atan2l(long double y, long 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.  The float and long double variants
       are C99 requirements.

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



				  2002-07-27			     ATAN2(3)