SLATEC Routines --- CHU ---

*DECK CHU
      FUNCTION CHU (A, B, X)
C***BEGIN PROLOGUE  CHU
C***PURPOSE  Compute the logarithmic confluent hypergeometric function.
C***LIBRARY   SLATEC (FNLIB)
C***CATEGORY  C11
C***TYPE      SINGLE PRECISION (CHU-S, DCHU-D)
C***KEYWORDS  FNLIB, LOGARITHMIC CONFLUENT HYPERGEOMETRIC FUNCTION,
C             SPECIAL FUNCTIONS
C***AUTHOR  Fullerton, W., (LANL)
C***DESCRIPTION
C
C CHU computes the logarithmic confluent hypergeometric function,
C U(A,B,X).
C
C Input Parameters:
C       A   real
C       B   real
C       X   real and positive
C
C This routine is not valid when 1+A-B is close to zero if X is small.
C
C***REFERENCES  (NONE)
C***ROUTINES CALLED  EXPREL, GAMMA, GAMR, POCH, POCH1, R1MACH, R9CHU,
C                    XERMSG
C***REVISION HISTORY  (YYMMDD)
C   770801  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  CHU