Fix Python – figure of imshow() is too small


Asked By – Ruofeng

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!

Now we will see solution for issue: figure of imshow() is too small


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


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')

which gives you:


This question is answered By – bmu

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