zasyi.f
SUBROUTINE ZASYI (ZR, ZI, FNU, KODE, N, YR, YI, NZ, RL, TOL, ELIM,
+ ALIM)
C***BEGIN PROLOGUE ZASYI
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Warning: this routine is not intended to be user-callable.
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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