" AttributeError:“列表"对象没有属性"ravel"" [英] "AttributeError: 'list' object has no attribute 'ravel'"

问题描述

我有一个微分方程组，需要计算雅可比行列式.下面的代码引发 AttributeError:'list'对象没有属性'ravel'.我想念什么?

I have a system of differential equations and need to calculate the Jacobian. The code below throws AttributeError: 'list' object has no attribute 'ravel'. What am I missing?

import numpy as np
import numdifftools as ndt

def rhs(z, t=0):
    x,y = z

    xdot = (x/5 + y)*(-x**2+1)
    ydot = -x*(-y**2+1)

    return [xdot, ydot]

Jfun = ndt.Jacobian(rhs)

Jfun([1,1])

推荐答案

只需:

return np.array([xdot, ydot])

相反.这应该起作用...

instead. This should work...

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