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SUBROUTINE GMMMA

PURPOSE
   COMPUTES THE GAMMA FUNCTION FOR A GIVEN ARGUMENT

USAGE
   CALL GMMMA(XX,GX,IER)

DESCRIPTION OF PARAMETERS
   XX -THE ARGUMENT FOR THE GAMMA FUNCTION
   GX -THE RESULTANT GAMMA FUNCTION VALUE
   IER-RESULTANT ERROR CODE WHERE
       IER=0  NO ERROR
       IER=1  XX IS WITHIN .000001 OF BEING A NEGATIVE INTEGER
       IER=2  XX GT 57, OVERFLOW, GX SET TO 1.0E75

REMARKS
   NONE

SUBROUTINES AND FUNCTION SUBPROGRAMS REQUIRED
   NONE

METHOD
   THE RECURSION RELATION AND POLYNOMIAL APPROXIMATION
   BY C.HASTINGS,JR., 'APPROXIMATIONS FOR DIGITAL COMPUTERS',
   PRINCETON UNIVERSITY PRESS, 1955