尝试求解隐式方程时出现 UnboundLocalError 'referenced before assignment'

Question

我在尝试求解这个隐式方程时遇到错误：

y = x^3 +sqrt(y)

问题：当 x = [0, 1, 2.5, 2.8, 3, 3.2].

时求 y

"UnboundLocalError: local variable 'y' referenced before assignment"

我该如何解决这个问题：

from math import *
import numpy as np
import matplotlib.pyplot as plt
from scipy.optimize import fsolve

def f(x):
    y = np.power(x,3.0) - sqrt(y)
    return y

x = [0, 1, 2.3611, 2.9033, 3.2859, 3.5915]
x= fsolve(f, 0)

print(x)

Answer 1

而不是：

y = np.power(x,3.0) - sqrt(y)

你可以试试：

y = np.power(x,3.0)
y = y - sqrt(y)

您声明的变量 y 不存在

尝试求解隐式方程时出现 UnboundLocalError 'referenced before assignment'

UnboundLocalError 'referenced before assignment' when trying to solve an implicit equation

python

equation