1、用例一

1 import matplotlib.pyplot as plt 2 import numpy as np 3 x=np.linspace(0,10,100) 4 y=np.cos(2*np.pi*x)*np.exp(-x)+0.9 5 plt.plot(x,y,'k',color='b',label="$08$",linewidth=3) 6 plt.axis([0,6,0,1.8]) 7 ix=(x>0.8)&(x<3) 8 plt.fill_between(x,y,0,where=ix,\ 9                 facecolor='grey',alpha=0.25)10 plt.text(0.5*(0.8+3),0.2,r"$\int_a^b f(x)\mathrm{d}x$",\11          horizontalalignment='center')12 plt.legend()13 plt.show()

 

 　

 

2、用例二

1 import matplotlib.pyplot as plt 2 import numpy as np 3 x=np.linspace(0,10,100) 4 y=np.cos(2*np.pi*x)*np.exp(-x)+0.9 5 plt.plot(x,y,'k',color='b',label="$08$",linewidth=3) 6 #plt.axis([0,6,0,1.8]) 7 #ix=(x>0.8)&(x<3) 8 #plt.fill_between(x,y,0,where=ix,\ 9 #                facecolor='grey',alpha=0.25)10 #plt.text(0.5*(0.8+3),0.2,r"$\int_a^b f(x)\mathrm{d}x$",\11         # horizontalalignment='center')12 plt.legend()13 plt.show()