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()
