matplotlib-users

[Matplotlib-users] Correct versions of old commands

[Giovanni P. <g.p...@gm...>]

Hi everybody,
sorry, I guess the question is trivial, but I confess my matplotlib
and python ignorance.

I'm running some code written by someone else, and apparently some
bits of the code are not compliant with newer versions of matplotlib.
So, how can I rewrite the following, which give AttributError?

> self.ax.get_figure().axes = []

and

> self.ax.get_figure().axes = [self.ax]

Thanks a lot.

Re: [Matplotlib-users] Correct versions of old commands

[Benjamin R. <ben...@ou...>]

On Sunday, September 23, 2012, Giovanni Plantageneto wrote:

> Hi everybody,
> sorry, I guess the question is trivial, but I confess my matplotlib
> and python ignorance.
>
> I'm running some code written by someone else, and apparently some
> bits of the code are not compliant with newer versions of matplotlib.
> So, how can I rewrite the following, which give AttributError?
>
> > self.ax.get_figure().axes = []
>
> and
>
> > self.ax.get_figure().axes = [self.ax]
>
> Thanks a lot.
>
>
Without context, it would be hard to say.  What was the exception message?
 I bet it was a NoneType object being returned by get_figure(), which would
mean that the Axes object was created without a figure, which is rarely
done.

Also, it looks like the code was trying to manage the hierarchy of objects
itself (maybe the code was trying to detach an axes from one figure and
transfer to another?  Lots of bookkeeping code like this is not needed, but
you may still have other issues lurking.

Ben Root

Re: [Matplotlib-users] Correct versions of old commands

[Eric F. <ef...@ha...>]

On 2012/09/23 9:27 AM, Benjamin Root wrote:
>
>
> On Sunday, September 23, 2012, Giovanni Plantageneto wrote:
>
>     Hi everybody,
>     sorry, I guess the question is trivial, but I confess my matplotlib
>     and python ignorance.
>
>     I'm running some code written by someone else, and apparently some
>     bits of the code are not compliant with newer versions of matplotlib.
>     So, how can I rewrite the following, which give AttributError?
>
>      > self.ax.get_figure().axes = []
>
>     and
>
>      > self.ax.get_figure().axes = [self.ax <http://self.ax>]
>
>     Thanks a lot.
>
>
> Without context, it would be hard to say.  What was the exception
> message?  I bet it was a NoneType object being returned by get_figure(),
> which would mean that the Axes object was created without a figure,
> which is rarely done.

It looks to me like the code was trying to delete all axes but one from 
the figure.  This probably worked when Figure.axes was a plain list, but 
for quite some time it has been a read-only list generated from an 
AxesStack instance.

The code will need rewriting based on an understanding of what it is 
trying to do, and how mpl works now.  There is no shortcut.  For this 
particular problem, you might be able to do something like this:

fig = self.ax.get_figure()
axlist = fig.axes
for ax in axlist:
     if not ax == self.ax:
         fig.delaxes(ax)

Eric

>
> Also, it looks like the code was trying to manage the hierarchy of
> objects itself (maybe the code was trying to detach an axes from one
> figure and transfer to another?  Lots of bookkeeping code like this is
> not needed, but you may still have other issues lurking.
>
> Ben Root
>
>
>
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Re: [Matplotlib-users] Correct versions of old commands

[Giovanni P. <g.p...@gm...>]

One of the suggestions I got works:

>Maybe this:

>self.ax.get_figure().clf()
>self.ax.get_figure().add_axes(self.ax)

>But it looks really weird to me.

If I understand it correctly, from matplotlib version 1.1.1 (?)
statements as "self.ax.get_figure().axes = []" are not possible any
more as axes are not lists anymore. Don't take my word for it, though.

Thanks for the support.


2012/9/23 Giovanni Plantageneto <g.p...@gm...>:
> Hi everybody,
> sorry, I guess the question is trivial, but I confess my matplotlib
> and python ignorance.
>
> I'm running some code written by someone else, and apparently some
> bits of the code are not compliant with newer versions of matplotlib.
> So, how can I rewrite the following, which give AttributError?
>
>> self.ax.get_figure().axes = []
>
> and
>
>> self.ax.get_figure().axes = [self.ax]
>
> Thanks a lot.

Re: [Matplotlib-users] Correct versions of old commands

[Eric F. <ef...@ha...>]

On 2012/09/23 9:45 AM, Giovanni Plantageneto wrote:
> One of the suggestions I got works:
>
>> Maybe this:
>
>> self.ax.get_figure().clf()
>> self.ax.get_figure().add_axes(self.ax)

This seems a bit dangerous, because logically, even if does not 
presently do so, the clf() call could remove the figure reference from 
self.ax.  If you want to go this route, then:

fig = self.ax.get_figure()
fig.clf()
fig.add_axes(self.ax)

Eric

>
>> But it looks really weird to me.
>
> If I understand it correctly, from matplotlib version 1.1.1 (?)
> statements as "self.ax.get_figure().axes = []" are not possible any
> more as axes are not lists anymore. Don't take my word for it, though.
>
> Thanks for the support.
>
>
> 2012/9/23 Giovanni Plantageneto <g.p...@gm...>:
>> Hi everybody,
>> sorry, I guess the question is trivial, but I confess my matplotlib
>> and python ignorance.
>>
>> I'm running some code written by someone else, and apparently some
>> bits of the code are not compliant with newer versions of matplotlib.
>> So, how can I rewrite the following, which give AttributError?
>>
>>> self.ax.get_figure().axes = []
>>
>> and
>>
>>> self.ax.get_figure().axes = [self.ax]
>>
>> Thanks a lot.
>
> ------------------------------------------------------------------------------
> Everyone hates slow websites. So do we.
> Make your web apps faster with AppDynamics
> Download AppDynamics Lite for free today:
> http://ad.doubleclick.net/clk;258768047;13503038;j?
> http://info.appdynamics.com/FreeJavaPerformanceDownload.html
> _______________________________________________
> Matplotlib-users mailing list
> Mat...@li...
> https://lists.sourceforge.net/lists/listinfo/matplotlib-users
>