Hi,

I have x-y grid data with z values and want to have a pixel view and contour
view at the same time on the same position. Both cases should have polar
coordinate system but since contour function does not plot on the polar
coordinate system, it is plotted on a rectilinear projection with converting
the polar grid into x-y grid. Please let me know if this isn't true.

For pixel view, pcolormesh was used. The subplot was added with specifying
the projection='polar', as something like below:

>>> axp=fig.add_subplot(1,1,1,projection='polar')
>>> axr=fig.add_subplot(2,2,1)

Then, I will have two independent axes shown in the figure canvas.
Since I want to place the two axes on the same position, if allowed, I would
like to do:

>>> axp=fig.add_subplot(1,1,1,projection='polar')
>>> axr=fig.add_subplot(1,1,1)

But it only gives one axis added to 'fig.axes'.
Is there any work-around? Or am I missing some other feature of matplotlib?

Youngung
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