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tgammad64.3m (2010 09)

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tgammad64(3M) tgammad64(3M)
(HP Integrity Server Only)
NAME
tgammad64(), tgammad128(), tgammad32() - decimal true gamma functions
SYNOPSIS
#define __STDC_WANT_DEC_FP__
#include <math.h>
_Decimal64 tgammad64(_Decimal64 x);
_Decimal128 tgammad128(_Decimal128 x);
_Decimal32 tgammad32(_Decimal32 x);
DESCRIPTION
The tgammad64() function computes the true gamma function of x.
In contrast, the
lgammad64() function computes the log of gamma.
tgammad128() is a _Decimal128 version of tgammad64(); it takes a
_Decimal128 argument and
returns a
_Decimal128 result.
tgammad32() is a _Decimal32 version of tgammad64(); it takes a
_Decimal32 argument and
returns a
_Decimal32 result.
These math functions are supported for HP-UX 11i Version 3 September 2008 Update and forward.
USAGE
To use any of these functions, compile with the +decfp option.
Make sure your program defines
__STDC_WANT_DEC_FP__
and then includes <math.h>.
Link in the math library by specifying
-lm or -l:libm.a on the linking command line.
For more information, see the HP-UX floating-point guide for HP Integrity servers at the following site:
http://www.hp.com/go/fp
.
RETURN VALUE
If x equals ±0,
tgammad64() returns ±infinity, and raises the divide-by-zero exception.
If x is a negative integer,
tgammad64() returns NaN and raises the invalid exception.
If x equals -infinity,
tgammad64() returns NaN and raises the invalid exception.
If x equals +infinity
tgammad64() returns +infinity.
If x is NaN,
tgammad64() returns NaN.
tgammad64() returns the properly signed infinity (or, in some non-default rounding direction modes,
the properly signed maximum-magnitude finite number) in lieu of a value whose magnitude is too large,
and raises the overflow and inexact exceptions.
tgammad64() raises the underflow exception whenever a result is tiny (essentially subnormal or zero)
and inexact.
tgammad64() raises the inexact exception whenever a rounded result does not equal the mathematical
result.
ERRORS
If x is a negative integer,
tgammad64() sets errno to [EDOM].
If x equals ±0,
tgammad64() sets errno to [ERANGE].
If the correct value would overflow,
tgammad64() sets errno to [ERANGE].
SEE ALSO
expd64(3M), lgammad64(3M), logd64(3M), math(5).
STANDARDS CONFORMANCE
These functions conform to ISO/IEC TR 24732, "Extension for the programming language C to support
decimal floating-point arithmetic".
HP-UX 11i Version 3: September 2010 − 1 − Hewlett-Packard Company 1

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