On 2013/03/20 3:16 PM, Brendan Barnwell wrote:
> On 2013-03-20 14:25, Eric Firing wrote:
>> On 2013/03/20 8:57 AM, Jonathan Slavin wrote:
>>> Hi all,
>>>
>>> I've run across a minor but annoying bug. It can be demonstrated pretty
>>> simply:
>>>
>>> fig, ax = plt.subplots(2,1,sharex=True,figsize=(7.,7.))
>>> fig.subplots_adjust(hspace=0.0)
>>> x = 4.25*(np.arange(6.) - 2.5)/10.
>>> y = 0.6*x/max(x)
>>> ax[0].plot(x,y)
>>> ax[0].set_xlim(-1.2,1.2)
>>> ax[0].set_aspect('equal')
>>> ax[1].plot(x,y)
>>> ax[0].set_ylim(-0.6,0.6)
>>> ax[1].set_ylim(-0.6,0.6)
>>> ax[1].set_aspect('equal')
>>> plt.show()
>>>
>>> The problem is that the y limits on the two plots are slightly different
>>> from those set:
>>
>> I think the problem is that you are trying to specify too many things:
>> you are specifying the box dimensions when you make the axes, then you
>> are specifying xlim, and then you are specifying ylim, but then you are
>> asking for a 1:1 aspect ratio. Something has to give! The aspect ratio
>> handling is designed to provide the specified aspect ratio under a wide
>> range of circumstances, including zooming and panning, and to do that,
>> it has to be able to change something. You can choose to let the box
>> dimensions be changeable, or the data limits.
>
> If I understand right, though, in this case what should give is the
> spacing around the axes but inside the figure (as suggested in the
> original post). You should be able to fix the aspect ratio of the
> *axes* and also the dimensions of the *figure*, and let the slack be
> taken up by blank space around the axes. It would still be possible for
> the dimensions of the axes box to change, just not their aspect ratio
> (i.e., zooming in on an oblong region would just result in a lot of
> blank space).
>
That is exactly what I suggested--use the kwarg adjustable='box-forced'
when axes are shared. I think this will not work quite right for
zooming and panning, which is the reason the normal adjustable='box' is
rejected when axes are shared.
Eric
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