python - 在 Python 中使用 Matplotlib 绘制抛物线

Question

我试图在 matplotlib 中绘制一个简单的抛物线，但我对如何在抛物线上绘制点感到困惑。到目前为止，这就是我所拥有的:

import matplotlib.pyplot as plt
a=[]
b=[]
y=0
x=-50
while x in range(-50,50,1):
    y=x^2+2*x+2
    a=[x]
    b=[y]
    fig= plt.figure()
    axes=fig.add_subplot(111)
    axes.plot(a,b)
    plt.show()
    x= x+1

Answer 1

应该这样做:

import matplotlib.pyplot as plt
import numpy as np

# create 1000 equally spaced points between -10 and 10
x = np.linspace(-10, 10, 1000)

# calculate the y value for each element of the x vector
y = x**2 + 2*x + 2  

fig, ax = plt.subplots()
ax.plot(x, y)