Ellipse Collection

Drawing a collection of ellipses. While this would equally be possible using a EllipseCollection or PathCollection, the use of an EllipseCollection allows for much shorter code.

import matplotlib.pyplot as plt
import numpy as np
from matplotlib.collections import EllipseCollection

x = np.arange(10)
y = np.arange(15)
X, Y = np.meshgrid(x, y)

XY = np.column_stack((X.ravel(), Y.ravel()))

ww = X / 10.0
hh = Y / 15.0
aa = X * 9


fig, ax = plt.subplots()

ec = EllipseCollection(ww, hh, aa, units='x', offsets=XY,
                       transOffset=ax.transData)
ec.set_array((X + Y).ravel())
ax.add_collection(ec)
ax.autoscale_view()
ax.set_xlabel('X')
ax.set_ylabel('y')
cbar = plt.colorbar(ec)
cbar.set_label('X+Y')
plt.show()

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References

The use of the following functions, methods, classes and modules is shown in this example:

import matplotlib
matplotlib.collections
matplotlib.collections.EllipseCollection
matplotlib.axes.Axes.add_collection
matplotlib.axes.Axes.autoscale_view
matplotlib.cm.ScalarMappable.set_array

Out:

<function ScalarMappable.set_array at 0x7f73beccedc0>