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 you want to fix the data limits, then you have to make the box
adjustable. This can cause problems with shared axes, but you can try
it with ax[0].set_aspect('equal', adjustable='box-forced').
Eric
> ax[1].get_ylim()
> (-0.61935483870967734, 0.61935483870967734)
> and doing a set_ylim doesn't have any effect. This seems to be caused
> by the set_aspect('equal'), since removing it results in plots with the
> correct limits -- but aspect that is not quite equal. It is affected by
> the figsize parameter in the call to subplots. It seems I can get the
> correct y limits and aspect if I keep the set_aspect('equal') and fiddle
> with the figsize. But that certainly doesn't seem to be a desirable
> behavior. Ideally, the set_ylim (or set_xlim) would be respected as
> well as the apect ratio and extra blank space around the figure would be
> added as needed to fit the figsize.
>
> By the way, using no figsize argument to subplots results in y limits
> even smaller than the data limits. Also, this problem does not occur
> for single (non-stacked) plots and the use of subplots_adjust also does
> not seem to affect the problem. I'm using matplotlib 1.2.0
>
> I did notice that this issue is similar to that discussed in this
> thread:
> http://www.mail-archive.com/matplotlib-users@lists.sourceforge.net/msg05783.html
>
> Regards,
> Jon
>
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