Python-无法从numpy数组绘制图形

Question

I am trying plot a graph with a numpy array but the error occur in plt.plot(s,s) .

import numpy as np
import matplotlib.pyplot as plt

def npArrDefine():
    np.array=[]
    s=np.array
    for i in range(10):
        s.append(i+3)
    plt.plot(s,s)
    plt.axis([0,5,0,20])
    plt.show()
npArrDefine()

Answer 1

There's a lot of things wrong with your code.

1. np.array=[] and s=np.array . Here, you are setting a name that numpy uses to be an empty list (horrible!), and then you are setting s to be that empty list. Don't do this. Simply do s=[] .

2. Later on you are trying to plot by using plt.plot(s,s) which means you want to plot s against itself. This will always give you a straight 45 degree line with 0 intercept even if your code worked.

Your code block should be:

s=[]
for i in range(10):
    s.append(i+3)
s = np.array(s) #This line is optional, pyplot can use any array-like.
plt.plot(s)
...