import numpy as np import matplotlib matplotlib.use(“TkAgg”) import matplotlib.pyplot as plt def height(x,y): #the height function return(1-x/2+x5+y3)*np.exp(-x2-y2) n=256 x=np.linspace(-3,3,n) y=np.linspace(-3,3,n) X,Y=np.meshgrid(x,y) #把X，Y传入网格中,X.shape=nn,Y.shape=nn
use plt.contourf to filling contours
#X,Y and value for (X,Y) point plt.contourf(X,Y,height(X,Y),8,alpha=0.75,cmap=plt.cm.hot) #8:8+2=10,将高分为10部分， #alpha：透明度 #cmap：color map #use plt.contour to add contour lines C=plt.contour(X,Y,height(X,Y),8,colors=“black”,linewidth=.5) #adding label plt.clabel(C,inline=True,fontsize=10) #clabel:cycle的label，inline=True表示label在line内，fontsize表示label的字体大小 plt.show()
