GNU Octave  6.2.0
A high-level interpreted language, primarily intended for numerical computations, mostly compatible with Matlab
zbunk.f
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1  SUBROUTINE zbunk(ZR, ZI, FNU, KODE, MR, N, YR, YI, NZ, TOL, ELIM,
2  * ALIM)
3 C***BEGIN PROLOGUE ZBUNK
4 C***REFER TO ZBESK,ZBESH
5 C
6 C ZBUNK COMPUTES THE K BESSEL FUNCTION FOR FNU.GT.FNUL.
7 C ACCORDING TO THE UNIFORM ASYMPTOTIC EXPANSION FOR K(FNU,Z)
8 C IN ZUNK1 AND THE EXPANSION FOR H(2,FNU,Z) IN ZUNK2
9 C
10 C***ROUTINES CALLED ZUNK1,ZUNK2
11 C***END PROLOGUE ZBUNK
12 C COMPLEX Y,Z
13  DOUBLE PRECISION ALIM, AX, AY, ELIM, FNU, TOL, YI, YR, ZI, ZR
14  INTEGER KODE, MR, N, NZ
15  dimension yr(n), yi(n)
16  nz = 0
17  ax = dabs(zr)*1.7321d0
18  ay = dabs(zi)
19  IF (ay.GT.ax) GO TO 10
20 C-----------------------------------------------------------------------
21 C ASYMPTOTIC EXPANSION FOR K(FNU,Z) FOR LARGE FNU APPLIED IN
22 C -PI/3.LE.ARG(Z).LE.PI/3
23 C-----------------------------------------------------------------------
24  CALL zunk1(zr, zi, fnu, kode, mr, n, yr, yi, nz, tol, elim, alim)
25  GO TO 20
26  10 CONTINUE
27 C-----------------------------------------------------------------------
28 C ASYMPTOTIC EXPANSION FOR H(2,FNU,Z*EXP(M*HPI)) FOR LARGE FNU
29 C APPLIED IN PI/3.LT.ABS(ARG(Z)).LE.PI/2 WHERE M=+I OR -I
30 C AND HPI=PI/2
31 C-----------------------------------------------------------------------
32  CALL zunk2(zr, zi, fnu, kode, mr, n, yr, yi, nz, tol, elim, alim)
33  20 CONTINUE
34  RETURN
35  END
subroutine zbunk(ZR, ZI, FNU, KODE, MR, N, YR, YI, NZ, TOL, ELIM, ALIM)
Definition: zbunk.f:3
subroutine zunk1(ZR, ZI, FNU, KODE, MR, N, YR, YI, NZ, TOL, ELIM, ALIM)
Definition: zunk1.f:3
subroutine zunk2(ZR, ZI, FNU, KODE, MR, N, YR, YI, NZ, TOL, ELIM, ALIM)
Definition: zunk2.f:3