atan(3M)atan(3M)NAMEatan(), atanf(), atanl(), atanw(), atanq() - arctangent functions
SYNOPSIS
HP Integrity Server Only
DESCRIPTION
returns the arctangent of x,
is a version of it takes a argument and returns a result.
Integrity Server Only
is a version of it takes a argument and returns a result.
is an version of it takes an argument 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
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 and functions are available. Millicode ver‐
sions of math library functions are usually faster than their counter‐
parts 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 x
If x is NaN, returns NaN.
Whether raises the inexact exception is unspecified.
ERRORS
No errors are defined.
SEE ALSOacos(3M), asin(3M), atand(3M), atan2(3M), catan(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'')
atan(3M)