Examples of water.fvec.Vec.group()

    Vec va = null, vp;
    try {
      va = vactual.toEnum(); // always returns TransfVec
      vp = vpredict;
      // The vectors are from different groups => align them, but properly delete it after computation
      if (!va.group().equals(vp.group())) {
        vp = va.align(vp);
      }
      // compute thresholds, if not user-given
      if (thresholds != null) {
        sort(thresholds);

          va = TransfVec.compose( (TransfVec) va, vamap, domain, false ); // delete original va
          int[][] vpmap = Model.getDomainMapping(domain, predicted_domain, true);
          vp = TransfVec.compose( (TransfVec) vp, vpmap, domain, false ); // delete original vp
        } else domain = actual_domain;
        // The vectors are from different groups => align them, but properly delete it after computation
        if (!va.group().equals(vp.group())) {
          avp = vp;
          vp = va.align(vp);
        }
        cm = new CM(domain.length).doAll(va,vp)._cm;
      } else {

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