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import matplotlib.pyplot as plt
import numpy as np
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plt.rcParams['image.cmap'] = 'coolwarm'
plt.rcParams['image.origin'] = 'lower'
Some example data stolen from https://matplotlib.org/examples/pylab_examples/pcolor_demo.html:
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x, y = np.meshgrid(np.arange(-3, 3, 0.1), np.arange(-2, 2, 0.1))
z = (1 - x / 2 + x ** 5 + y ** 3) * np.exp(-x ** 2 - y ** 2)
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zmax = np.max(np.abs(z))
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fig, ax = plt.subplots(figsize=[5, 3.5])
ax.imshow(z, vmin=-zmax, vmax=zmax)