GNU Octave  3.8.0
A high-level interpreted language, primarily intended for numerical computations, mostly compatible with Matlab
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cfftb.f
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1  subroutine cfftb (n,c,wsave)
2  dimension c(*) ,wsave(*)
3  if (n .eq. 1) return
4  iw1 = n+n+1
5  iw2 = iw1+n+n
6  call cfftb1(n,c,wsave,wsave(iw1),wsave(iw2))
7  return
8  end