hpux man page for atan2dl

atan2d(3M)																atan2d(3M)

NAME
       atan2d(), atan2df(), atan2dl(), atan2dw(), atan2dq() - degree-valued arctangent-and-quadrant functions

SYNOPSIS
   HP Integrity Server Only
DESCRIPTION
       is  a degree-valued version of the function.  It returns the arctangent of y/x, in the range -180 to 180, using the signs of both arguments
       to determine the quadrant of the return value.

       is a version of it takes arguments and returns a result.

   Integrity Server Only
       is a version of it takes arguments and returns a result.

       is an version of it takes arguments and returns an result.

       is equivalent to on HP-UX systems.

USAGE
       To use these functions compile either with the default option or with the and the options.

       To use (for Integrity servers) or compile also with the option.

       To use any of these functions, make sure your program includes and link in the math library by specifying on the compiler or linker command
       line.

       For more information, see the at the following site:

RETURN VALUE
       If y and x is -0,

       If y and x is +0,

       If y and x is less than zero,

       If y and x is greater than zero, returns

       If y is less than zero and x is zero, returns -90.

       If y is greater than zero and x is zero, returns 90.

       If y is greater than zero and x is -INFINITY, returns 180.

       If y is less than zero and x is -INFINITY, returns -180.

       If y is greater than zero and x is INFINITY, returns +0.

       If y is less than zero and x is INFINITY, returns -0.

       If y and x is finite, returns

       If y and x is -INFINITY, returns

       If y and x is +INFINITY, returns

       If x or y is NaN, returns NaN.

ERRORS
       No errors are defined.

SEE ALSO
       acosd(3M), asind(3M), atand(3M), atan2(3M), cosd(3M), sind(3M), tand(3M), math(5).

STANDARDS CONFORMANCE
       These functions are not specified by any standard.

																	atan2d(3M)