matplotlib正弦和余弦图

代码：

 # -*- coding: utf-8 -*-
 """
 Created on Thu Jul 12 16:37:47 2018

 @author: zhen
 """
 """
     正弦和余弦图
 """
 import matplotlib.pyplot as plt

 import numpy as np

 x = np.linspace(-np.pi, np.pi, 256, endpoint=True)

 y_cos = np.cos(x)
 y_sin = np.sin(x)

 plt.plot(x, y_cos)
 plt.plot(x, y_sin)

 title("Function $\sin$ and $\cos$")

 xlim(-3.6, 3.6)
 ylim(-1.0, 1.0)

 # format ticks at specific values
 xticks([-np.pi, -np.pi/2, 0, np.pi/2, np.pi],[r'$-\pi$', r'$-\pi/2$', r'$0$', r'$+pi/2$', r'$+\pi$'])
 yticks([-1, 0, +1],[r'$-1$', r'$0$', r'$+1$'])

 plt.show()

结果：