圆的拟合算法，非常经典，拟合精度非常高，算法易懂，非常好的matlab代码-Circle fitting algorithm, very classic, very high fitting accuracy, the algorithm easy to understand, very good matlab code

根据X和Y两组数据，将两组数据在X-Y平面上最小二乘法拟合出圆(According to X and Y two sets of data, the two sets of data in the X-Y plane, the least square method of fitting the circle)