zfftb.f

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      subroutine zfftb (n,c,wsave)
      implicit double precision (a-h,o-z)
      dimension       c(*)       ,wsave(*)
      if (n .eq. 1) return
      iw1 = n+n+1
      iw2 = iw1+n+n
      call zfftb1 (n,c,wsave,wsave(iw1),wsave(iw2))
      return
      end