SLATEC Routines --- R9KNUS ---

*DECK R9KNUS
      SUBROUTINE R9KNUS (XNU, X, BKNU, BKNU1, ISWTCH)
C***BEGIN PROLOGUE  R9KNUS
C***SUBSIDIARY
C***PURPOSE  Compute Bessel functions EXP(X)*K-SUB-XNU(X) and EXP(X)*
C            K-SUB-XNU+1(X) for 0.0 .LE. XNU .LT. 1.0.
C***LIBRARY   SLATEC (FNLIB)
C***CATEGORY  C10B3
C***TYPE      SINGLE PRECISION (R9KNUS-S, D9KNUS-D)
C***KEYWORDS  BESSEL FUNCTION, FNLIB, SPECIAL FUNCTIONS
C***AUTHOR  Fullerton, W., (LANL)
C***DESCRIPTION
C
C Compute Bessel functions EXP(X) * K-sub-XNU (X)  and
C EXP(X) * K-sub-XNU+1 (X) for 0.0 .LE. XNU .LT. 1.0 .
C
C Series for C0K        on the interval  0.          to  2.50000D-01
C                                        with weighted error   1.60E-17
C                                         log weighted error  16.79
C                               significant figures required  15.99
C                                    decimal places required  17.40
C
C Series for ZNU1       on the interval -7.00000D-01 to  0.
C                                        with weighted error   1.43E-17
C                                         log weighted error  16.85
C                               significant figures required  16.08
C                                    decimal places required  17.38
C
C***REFERENCES  (NONE)
C***ROUTINES CALLED  CSEVL, GAMMA, INITS, R1MACH, XERMSG
C***REVISION HISTORY  (YYMMDD)
C   770601  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   900720  Routine changed from user-callable to subsidiary.  (WRB)
C   900727  Added EXTERNAL statement.  (WRB)
C   920618  Removed space from variable names.  (RWC, WRB)
C***END PROLOGUE  R9KNUS