说明：  Matlab GUI 编程。Matlab从外部载入数据文件，根据载入的数据文件可实时 调整要绘制的数据量以及是否显示标题、X轴标签、Y轴标签，然后绘制数据于新的绘图窗口。
(MATLAB GUI programming. MATLAB loads data files from outside. According to the loaded data files, it can adjust the amount of data to be drawn in real time and whether to display title, X-axis label and Y-axis label, and then draw data in the new drawing window.)