Re: [matplotlib-devel] xlim() turns off autoscaling

On Sun, Feb 6, 2011 at 11:52 AM, Eric Firing <ef...@ha...> wrote:

> On 02/06/2011 06:59 AM, Mike Kaufman wrote:
> >
> > The help for xlim() says:
> >
> >       Set/Get the xlimits of the current axes::
> >
> >         xmin, xmax = xlim()   # return the current xlim
> >         xlim( (xmin, xmax) )  # set the xlim to xmin, xmax
> >         xlim( xmin, xmax )    # set the xlim to xmin, xmax
> >
> >
> > but it also has the unexpected behavior of turning off autoscaling if
> used:
> >
> > -----
> > import matplotlib.pyplot as plt
> >
> > plt.clf()
> > ax = plt.subplot(211)
> > plt.draw()
> > print 'autoscale X on: ',ax._autoscaleXon,' xlim: ',plt.xlim()
> > ax.plot([0,.5,1,1.5,2],[0,1,0,1,0])
> > plt.draw()
> > print 'autoscale X on: ',ax._autoscaleXon,' xlim: ',ax.get_xlim(),'\n'
> >
> > ax = plt.subplot(212)
> > plt.draw()
> > print 'autoscale X on: ',ax._autoscaleXon,' xlim: ',ax.get_xlim()
> > plt.plot([0,.5,1,1.5,2],[0,1,0,1,0])
> > plt.draw()
> > print 'autoscale X on: ',ax._autoscaleXon,' xlim: ',ax.get_xlim(),'\n'
> > -----
> >
> > returns:
> >
> >   >>>  import xlim_unautoscale
> > autoscale X on:  True  xlim:  (0.0, 1.0)
> > autoscale X on:  False  xlim:  (0.0, 1.0)
> >
> > autoscale X on:  True  xlim:  (0.0, 1.0)
> > autoscale X on:  True  xlim:  (0.0, 2.0)
> >
> >
> > I assume that this is because xlim() calls set_xlim() which has
> > auto=False as a default keyword...
> >
> > expected behavior: xlim() should behave exactly like get_xlim()
> > ditto for ylim()
>
> I agree, so I have fixed this in the maintenance branch and in the trunk.
>
> Eric
>
>
Something I just noticed while looking at the x|ylim() functions.  The code
for xscale() and yscale() are acting like it returns something, but they
don't.  Is this a bug?  The documentation doesn't claim that it returns
anything.

Ben Root