from mpl_toolkits.mplot3d import Axes3D
from matplotlib import cm
from matplotlib.colors import LogNorm
import matplotlib.pyplot as plt
import numpy as np

fig = plt.figure()
ax = Axes3D(fig, azim = -128, elev = 52)
X = np.arange(-4.5, 4.5, 0.1)
Y = np.arange(-4.5,4.5, 0.1)
X, Y = np.meshgrid(X, Y)
Z = (1.5-X+X*Y)**2+(2.25-X+X*Y**2)**2+(2.625-X+X*Y**3)**2
ax.plot_surface(X, Y, Z, rstride = 1, cstride = 1, norm = LogNorm(), cmap = cm.jet)
plt.xlabel("x")
plt.ylabel("y")
plt.title("Beale function")

plt.savefig("Beale function.PNG")

plt.show()