# poch.f

          FUNCTION POCH (A, X)
    C***BEGIN PROLOGUE  POCH
    C***PURPOSE  Evaluate a generalization of Pochhammer's symbol.
    C***LIBRARY   SLATEC (FNLIB)
    C***CATEGORY  C1, C7A
    C***TYPE      SINGLE PRECISION (POCH-S, DPOCH-D)
    C***KEYWORDS  FNLIB, POCHHAMMER, SPECIAL FUNCTIONS
    C***AUTHOR  Fullerton, W., (LANL)
    C***DESCRIPTION
    C
    C Evaluate a generalization of Pochhammer's symbol
    C (A)-sub-X = GAMMA(A+X)/GAMMA(A).  For X a non-negative integer,
    C POCH(A,X) is just Pochhammer's symbol.  A and X are single precision.
    C This is a preliminary version.  Error handling when POCH(A,X) is
    C less than half precision is probably incorrect.  Grossly incorrect
    C arguments are not handled properly.
    C
    C***REFERENCES  (NONE)
    C***ROUTINES CALLED  ALGAMS, ALNREL, FAC, GAMMA, GAMR, R9LGMC, XERMSG
    C***REVISION HISTORY  (YYMMDD)
    C   770701  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   900727  Added EXTERNAL statement.  (WRB)
    C***END PROLOGUE  POCH