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Asked: 2026-06-03T23:34:05+00:00

I’m trying to visualize a numpy array using imshow() since it’s similar to imagesc()

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I’m trying to visualize a numpy array using imshow() since it’s similar to imagesc() in Matlab.

imshow(random.rand(8, 90), interpolation='nearest')

The resulting figure is very small at the center of the grey window, while most of the space is unoccupied. How can I set the parameters to make the figure larger? I tried figsize=(xx,xx) and it’s not what I want. Thanks!

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1 Answer

  1. Editorial Team

    If you don’t give an aspect argument to imshow, it will use the value for image.aspect in your matplotlibrc. The default for this value in a new matplotlibrc is equal.
    So imshow will plot your array with equal aspect ratio.

    If you don’t need an equal aspect you can set aspect to auto

    imshow(random.rand(8, 90), interpolation='nearest', aspect='auto')

    which gives the following figure

    imshow-auto

    If you want an equal aspect ratio you have to adapt your figsize according to the aspect

    fig, ax = subplots(figsize=(18, 2))
ax.imshow(random.rand(8, 90), interpolation='nearest')
tight_layout()

    which gives you:

    imshow-equal

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