matplotlib-devel Mailing List for matplotlib

On 02/06/2011 08:11 AM, Benjamin Root wrote:
[...]
>
> 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,

Like ax.xscale etc, it returns None.

It's not exactly a bug--the behavior is correct and matches the 
documentation--but the code is misleading and less concise than it could 
be.  Having noticed it, you might as well clean it up.  The code would 
be clearer without the use of "ret" and "return", though the end effect 
will be no different.

Eric


>
> Ben Root
>

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

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

>
> M
>
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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()

M