Matplotlib not displaying image

Question

I am trying to use matplotlib to view an image in ipython. However, I solely obtain a description of the image as opposed to seeing the actual image:

>>> import numpy as np
>>> import matplotlib.pyplot as plt
>>> plt.imshow(an_array)
Out[4]: <matplotlib.image.AxesImage at 0x7fb626f063d0>

This is with the backend set to Qt5Agg or TkAgg in .matplotlibrc

I have the same issues whether or not I am working in a conda virtual environment

I am running: Scientific Linux release 6.8 (Carbon), Python 2.7.13, Anaconda 4.3.0 (64-bit)

I have had similar issues on my local computer running MacOSX

I would be most grateful for any advice,

Thanks

Rob

I just tried that - but I get no output at all from plt.show(an_array) — RobMcC
– RobMcC, Commented Mar 7, 2017 at 9:16
Do not pass the array inside it. Under plt.imshow(an_array) add the line plt.show() — turnip
– turnip, Commented Mar 7, 2017 at 9:17

GPhilo · Accepted Answer · 2017-03-07 09:45:47Z

21

Add %matplotlib inline before import matplotlib.pyplot as plt to enable automatic visualization of your plots when the cell has finished executing.

Note, however, that this works just in iPython notebooks. Normally, you'd need to call plt.show() (without any arguments) to visualize the plots.

edited Mar 7, 2017 at 9:45

answered Mar 7, 2017 at 9:35

GPhilo

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2 Comments

RobMcC Over a year ago

Many thanks - just for my information is this normal (needing to call plt.show), or is there a minor bug in my setup?

GPhilo Over a year ago

It's absolutely normal. The idea behind this is that you can call several times plt.plot() (or other matplotlib functions) to add more plots to the same figure and then display it only when the whole figure is ready.

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