matplotlib: AttributeError: 'AxesSubplot'

Question

Not sure exactly sure how to fix the following attribute error:

AttributeError: 'AxesSubplot' object has no attribute 'add_axes'

The offending problem seems to be linked to the way I have set up my plot:

gridspec_layout = gridspec.GridSpec(3,3)
pyplot_2 = fig.add_subplot(gridspec_layout[2])

ax = WCSAxes(fig, [0.1, 0.1, 0.8, 0.8], wcs=wcs)
pyplot_2.add_axes(ax)

Does anybody know how to solve this? Many thanks.

Answer 1

just downgrade matploblit to an old version would help. I downgrade it to 1.4.0 and it fix the problem.

Answer 2

There's not much details to go on in your question but I'll wager a guess. The error is pretty self-explanatory. You can't add_axes to pyplot_2 because pyplot_2 is a matplotlib.axes.AxesSubplot object and they don't have an add_axes method defined.

Only matplotlib.figure.Figure objects have add_axes method defined on them.

From what I got from a short browse through the WCSAxes official documentation their recommended approach would be:

wcs = astropy.wcs.WCS(....)
fig = matplotlib.pyplot.figure()
pyplot_2 = fig.add_subplot(gridspec_layout[2], projection=wcs)

Answer 3

You now need to use set_prop_cycle i.e. ax.set_prop_cycle(color=['red', 'green', 'blue'])

Axes.set_color_cycle(clist) was depreciated since, version 1.5.

https://matplotlib.org/3.1.0/api/_as_gen/matplotlib.axes.Axes.set_prop_cycle.html