SLATEC Routines --- ZASYI ---

*DECK ZASYI
      SUBROUTINE ZASYI (ZR, ZI, FNU, KODE, N, YR, YI, NZ, RL, TOL, ELIM,
     +   ALIM)
C***BEGIN PROLOGUE  ZASYI
C***SUBSIDIARY
C***PURPOSE  Subsidiary to ZBESI and ZBESK
C***LIBRARY   SLATEC
C***TYPE      ALL (CASYI-A, ZASYI-A)
C***AUTHOR  Amos, D. E., (SNL)
C***DESCRIPTION
C
C     ZASYI COMPUTES THE I BESSEL FUNCTION FOR REAL(Z).GE.0.0 BY
C     MEANS OF THE ASYMPTOTIC EXPANSION FOR LARGE ABS(Z) IN THE
C     REGION ABS(Z).GT.MAX(RL,FNU*FNU/2). NZ=0 IS A NORMAL RETURN.
C     NZ.LT.0 INDICATES AN OVERFLOW ON KODE=1.
C
C***SEE ALSO  ZBESI, ZBESK
C***ROUTINES CALLED  D1MACH, ZABS, ZDIV, ZEXP, ZMLT, ZSQRT
C***REVISION HISTORY  (YYMMDD)
C   830501  DATE WRITTEN
C   910415  Prologue converted to Version 4.0 format.  (BAB)
C   930122  Added ZEXP and ZSQRT to EXTERNAL statement.  (RWC)
C***END PROLOGUE  ZASYI