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"""Simple matshow() example."""
import matplotlib.pyplot as plt
import numpy as np
def samplemat(dims):
"""Make a matrix with all zeros and increasing elements on the diagonal"""
aa = np.zeros(dims)
for i in range(min(dims)):
aa[i, i] = i
return aa
# Display 2 matrices of different sizes
dimlist = [(12, 12), (15, 35)]
for d in dimlist:
plt.matshow(samplemat(d))
# Display a random matrix with a specified figure number and a grayscale
# colormap
plt.matshow(np.random.rand(64, 64), fignum=100, cmap=plt.cm.gray)
plt.show()
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