this.w_re = w_re; this.w_im = w_im;
  public void init(final float w_re, final float w_im, final int numbflies)   {    this.w_re = w_re;     this.w_im = w_im;     /* The splitjoin routes the complex points in a round-robin fashion,       * one each to/from the constituent butterflies.       */    this.setSplitter(ROUND_ROBIN(2));     /* for each butterfly in this group */      for (int b=0; b<numbflies; b++)      this.add(new Butterfly(w_re, w_im));      this.setJoiner(ROUND_ROBIN(2));   }