我应该如何找到对应于抛物线的最大或最小 y_value 的 x_value？ （在 Python 中）

Question

I've been tying to use np.where to find the x value that corresponds to the maximum y value of a parabola, here is what I did:

import numpy as np
x = np.arange(-10,10,step=1)
y = x**2+2*x
x = np.where(y=max)
print(x)

This clearly doesn't work

Answer 1

You can simply use argmin

import numpy as np
x = np.arange(-10,10,step=1)
y = x**2+2*x
idx = np.argmin(y)
print(x[idx])