2d graph of signals of arduino

Processing Electronics (Arduino, etc.)
7

yes it is right, i try use this but it mark a error

 if (vals.length == 6) {
    plot2.addPoint(i, vals[0]);
    points1a.add(i, vals[1]*2);
    plot2.addPoint(points1a,"layer 2" );
  }

Error is

The method addPoint(GPoint, String) in the type GPlot is not applicable for the arguments (GPointsArray, String)