docs: public void reset() {
      Arrays.fill(mean, 0.);
      Arrays.fill(nmea, 0.);
      if(elements != null) {
        for(int i = 0; i < elements.length; i++) {
          Arrays.fill(elements[i], 0.);
        }
      }
      else {
        elements = new double[mean.length][mean.length];
      }
      wsum = 0.;
    }