image.png
import matplotlib.pyplot as plt
import numpy as np
def f(x,y):
return (1 - x/2 + x**5 + y**3) * np.exp(-x**2 - y**2)
n = 256
x = np.linspace(-3,3,n)
y = np.linspace(-3,3,n)
X,Y = np.meshgrid(x,y)
# use plt.contourf to filling contours
# X,Y and value for (X,Y) point
plt.contourf(X,Y,f(X,Y),8,alpha=0.75,cmap=plt.cm.hot)
# user plt.contourf to add contour lines
C = plt.contour(X,Y,f(X,Y),8,colors='black',linewidth=.5)
# adding label
plt.clabel(C,inline=True,fontsize=10)
plt.xticks(())
plt.yticks(())
plt.show()
