matplotlib正弦和余弦图

代码：

 1 # -*- coding: utf-8 -*-
 2 """
 3 Created on Thu Jul 12 16:37:47 2018
 4 
 5 @author: zhen
 6 """
 7 """
 8     正弦和余弦图
 9 """
10 import matplotlib.pyplot as plt
11 
12 import numpy as np
13 
14 x = np.linspace(-np.pi, np.pi, 256, endpoint=True)
15 
16 y_cos = np.cos(x)
17 y_sin = np.sin(x)
18 
19 plt.plot(x, y_cos)
20 plt.plot(x, y_sin)
21 
22 title("Function $\sin$ and $\cos$")
23 
24 xlim(-3.6, 3.6)
25 ylim(-1.0, 1.0)
26 
27 # format ticks at specific values
28 xticks([-np.pi, -np.pi/2, 0, np.pi/2, np.pi],[r'$-\pi$', r'$-\pi/2$', r'$0$', r'$+pi/2$', r'$+\pi$'])
29 yticks([-1, 0, +1],[r'$-1$', r'$0$', r'$+1$'])
30 
31 plt.show()

结果：