这个报错是因为我们在求解行列式的值的时候使用了：
np.linalg.det(D)
但是D必须是方阵才可以进行运算，不是方阵则会报错，我们把之前的行列式更改为方阵就不会再报错了，当然这也是numpy自身计算数值的一个缺陷。
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