from mpl_toolkits.mplot3d import Axes3D
import matplotlib.pyplot as plt
from matplotlib import cm
import numpy as np
fig = plt.figure()
ax = fig.gca(projection='3d')
X = np.arange(-8, 8, 0.25)
Y = np.arange(-8, 8, 0.25)
X, Y = np.meshgrid(X, Y)
Z = np.sqrt(X**2+Y**2)
surf = ax.plot_surface(X, Y, Z, cmap=cm.coolwarm, linewidth = 0, antialiased=False)
fig.colorbar(surf, shrink=0.5, aspect=5)
plt.title('Wykres funkcji f(x,y)=(..)')
plt.show()
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