# dpoch.f

          DOUBLE PRECISION FUNCTION DPOCH (A, X)
    C***BEGIN PROLOGUE  DPOCH
    C***PURPOSE  Evaluate a generalization of Pochhammer's symbol.
    C***LIBRARY   SLATEC (FNLIB)
    C***CATEGORY  C1, C7A
    C***TYPE      DOUBLE PRECISION (POCH-S, DPOCH-D)
    C***KEYWORDS  FNLIB, POCHHAMMER, SPECIAL FUNCTIONS
    C***AUTHOR  Fullerton, W., (LANL)
    C***DESCRIPTION
    C
    C Evaluate a double precision generalization of Pochhammer's symbol
    C (A)-sub-X = GAMMA(A+X)/GAMMA(A) for double precision A and X.
    C For X a non-negative integer, POCH(A,X) is just Pochhammer's symbol.
    C This is a preliminary version that does not handle wrong arguments
    C properly and may not properly handle the case when the result is
    C computed to less than half of double precision.
    C
    C***REFERENCES  (NONE)
    C***ROUTINES CALLED  D9LGMC, DFAC, DGAMMA, DGAMR, DLGAMS, DLNREL, XERMSG
    C***REVISION HISTORY  (YYMMDD)
    C   770701  DATE WRITTEN
    C   890531  Changed all specific intrinsics to generic.  (WRB)
    C   890911  Removed unnecessary intrinsics.  (WRB)
    C   890911  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   900727  Added EXTERNAL statement.  (WRB)
    C***END PROLOGUE  DPOCH