中文说明：数控机床轨迹位置设定需要用到插值，常用nurbs插值实现，在MATLAB仿真时候需要用nurbs模拟曲线，本文件可以用MATLAB实现nurbs曲线绘制
English Description：
CNC machine tool trajectory position setting need to use interpolation, commonly used to achieve NURBS interpolation, in MATLAB simulation time need to use NURBS simulation curve, this file can use matlab to achieve NURBS curve drawing