matplotlib膠乳中的標記蝨

Question

在matplotlib中的圖中，我特別想在x軸上標記乳膠中的pi/2，pi，3pi/2等點。我該怎麼做？

Answer 1

plt.xticks命令可用於放置LaTeX刻度標記。有關更多詳細信息，請參閱此doc page。

import matplotlib as mpl 
import matplotlib.pyplot as plt 
import numpy as np 

cos = np.cos 
pi = np.pi 

# This is not necessary if `text.usetex : True` is already set in `matplotlibrc`.  
mpl.rc('text', usetex = True) 
fig = plt.figure() 
ax = fig.add_subplot(1, 1, 1) 
t = np.linspace(0.0, 2*pi, 100) 
s = cos(t) 
plt.plot(t, s) 

plt.xticks([0, pi/2, pi, 3*pi/2, 2*pi], 
      ['$0$', r'$\frac{\pi}{2}$', r'$\pi$', r'$\frac{3\pi}{2}$', r'$2\pi$']) 
plt.show()