Matshow

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import numpy as np
import plotpress

rng = np.random.default_rng(0)
M = rng.standard_normal((12, 12))
M += np.eye(12) * 3                        # a bright diagonal to read the layout

fig, ax = plotpress.subplots()
im = ax.matshow(M, cmap="RdBu")
ax.set_title("matshow"); fig.colorbar(im, ax=ax)