atan2f man page on HP-UX

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atan2(3M)							     atan2(3M)

NAME
       atan2(),	 atan2f(), atan2l(), atan2w(), atan2q() - arctangent and quad‐
       rant functions

SYNOPSIS
   HP Integrity Server Only
DESCRIPTION
       returns the arctangent of y/x, 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:

   PA-RISC Only
       Millicode versions of the function are available.   Millicode  versions
       of math library functions are usually faster than their counterparts in
       the standard library.  To use these versions, compile your program with
       the or the optimization option.

       For  special  cases,  the  millicode versions return the same values as
       their standard library counterparts (see the section).

RETURN VALUE
       If y and x is −0

       If y and x is +0

       If y and x is less than zero, returns

       If y and x is greater than zero, returns

       If y is less than zero and x is zero, returns

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

       If y is greater than zero and x is −INFINITY, returns Pi.

       If y is less than zero and x is −INFINITY,

       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.

       Whether raises the inexact exception is unspecified.

ERRORS
       No errors are defined.

SEE ALSO
       acos(3M), asin(3M), atan(3M), atan2d(3M), carg(3M),  cos(3M),  sin(3M),
       tan(3M), math(5).

STANDARDS CONFORMANCE
       :  SVID3,  XPG4.2,  ANSI C, ISO/IEC C99 (including Annex F, ``IEC 60559
       floating-point arithmetic'')

       : ISO/IEC C99 (including Annex F,  ``IEC	 60559	floating-point	arith‐
       metic'')

								     atan2(3M)
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