 
      DOUBLE PRECISION FUNCTION DLBETA(A,B)
C***BEGIN PROLOGUE  DLBETA
C***DATE WRITTEN   770701   (YYMMDD)
C***REVISION DATE  820801   (YYMMDD)
C***CATEGORY NO.  C7B
C***KEYWORDS  BETA,BETA FUNCTION,COMPLETE BETA FUNCTION,
C             DOUBLE PRECISION,LOGARITHM,SPECIAL FUNCTION
C***AUTHOR  FULLERTON, W., (LANL)
C***PURPOSE  Computes the  d.p. natural logarithm of the complete Beta
C            function
C***DESCRIPTION
C
C DLBETA(A,B) calculates the double precision natural logarithm of
C the complete beta function for double precision arguments
C A and B.
C***REFERENCES  (NONE)
C***ROUTINES CALLED  D9LGMC,DGAMMA,DLNGAM,DLNREL,XERROR
C***END PROLOGUE  DLBETA
 
 
