通过该代码，可以学习以下三点知识：（1）matlab调用joystick，（2）删除一幅图中的曲线，(3)通过命令修改曲线的MarkerEdgeColor. 通过本程序的学习，可扩展应用至：（1）改变figure窗口的viewpoint，（2）云台转动控制-This is a very simple matlab program , which creat a connection between matlab and a joystick.You will learn how to use a