JEvaluator jeval = new JEvaluator(area.getText());

        for(double i = -TIMES; i < TIMES; i = i + 0.1)
        {
            jeval.setVariable("x",i);

            //Object myresult = null;
            double myresult = doubleValue((Double) jeval.eval());
            pointList.add(new Ellipse2D.Double(i + 500, myresult + 305, 3, 3));
        }
        pointl.setList(pointList);
        try
        {
            pointl.saveToBinaryFile();
        }
        catch (IOException e1)
        {
            e1.printStackTrace();
        }