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"""
===============================
Visualize matrices with matshow
===============================
`~.axes.Axes.matshow` visualizes a 2D matrix or array as color-coded image.
"""
import matplotlib.pyplot as plt
import numpy as np
# a 2D array with linearly increasing values on the diagonal
a = np.diag(range(15))
plt.matshow(a)
plt.show()
# %%
#
# .. admonition:: References
#
# The use of the following functions, methods, classes and modules is shown
# in this example:
#
# - `matplotlib.axes.Axes.imshow` / `matplotlib.pyplot.imshow`
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