中文说明：四轮转向汽车的matlab实现，3种实现方式。输入量为前后轮的旋转角度，输出量为汽车侧偏角和横摆角速度。6.5版本编写。
English Description：
Four wheel steering vehicle matlab implementation, three ways to achieve. The input value is the rotation angle of the front and rear wheels, and the output value is the vehicle side slip angle and yaw rate. Version 6.5.