# import required modules import matplotlib.pyplot as plt import matplotlib.tri as mtri import numpy as np # assign data x = np.asarray([0, 1, 2, 3, 0.5, 1.5, 2.5, 1, 2, 1.5]) y = np.asarray([0, 0, 0, 0, 1.0, 1.0, 1.0, 2, 2, 3.0]) triangles = [[0, 1, 4], [1, 5, 4], [2, 6, 5], [4, 5, 7], [5, 6, 8], [5, 8, 7], [7, 8, 9], [1, 2, 5], [2, 3, 6]] # depict illustration triang = mtri.Triangulation(x, y, triangles) z = np.cos(1.5 * x) * np.cos(1.5 * y) fig, axs = plt.subplots() axs.tricontourf(triang, z) axs.triplot(triang, 'go-', color ='white') # turn off the axes axs.set_axis_off() # assign title axs.set_title('Triangle illustration') plt.show()