Spy

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import numpy as np
import plotpress

rng = np.random.default_rng(1)
A = np.zeros((30, 30))
A[rng.random((30, 30)) > 0.9] = 1.0        # ~10% nonzero
np.fill_diagonal(A, 1.0)

fig, ax = plotpress.subplots()
ax.spy(A)
ax.set_title("spy (sparsity pattern)")