dfac.f
DOUBLE PRECISION FUNCTION DFAC (N)
C***BEGIN PROLOGUE DFAC
C***PURPOSE Compute the factorial function.
C***LIBRARY SLATEC (FNLIB)
C***CATEGORY C1
C***TYPE DOUBLE PRECISION (FAC-S, DFAC-D)
C***KEYWORDS FACTORIAL, FNLIB, SPECIAL FUNCTIONS
C***AUTHOR Fullerton, W., (LANL)
C***DESCRIPTION
C
C DFAC(N) calculates the double precision factorial for integer
C argument N.
C
C***REFERENCES (NONE)
C***ROUTINES CALLED D9LGMC, DGAMLM, XERMSG
C***REVISION HISTORY (YYMMDD)
C 770601 DATE WRITTEN
C 890531 Changed all specific intrinsics to generic. (WRB)
C 890531 REVISION DATE from Version 3.2
C 891214 Prologue converted to Version 4.0 format. (BAB)
C 900315 CALLs to XERROR changed to CALLs to XERMSG. (THJ)
C***END PROLOGUE DFAC