[Matplotlib-devel] Offer of additions to subplots

[Daniel da Silva]

I'm +1 on the addition of `squeeze='flatten'` as well. As a matter of fact
I found 5 instances of `axes = axes.flatten()` I've written in the past six
months, and even more cases where I didn't think of flatten() and used a
combination of floor division and modulus to achieve 2D indeces.

With regard two axis sharing, can you expand on the API you are proposing?
There seems to be some functionality for this as answered on StackOverflow
<http://stackoverflow.com/questions/4200586/matplotlib-pyplot-how-to-zoom-subplots-together>
.

> I am a bit more hesitant on the second, it might be crossing the line
into making the API too clever/flexible for its own good.
I'd have to look at the code to agree/disagree with you; but I wouldn't be
surprised if somewhere along the line someone made the assumption that axes
would only be owned by a single figure/subplot. Christopher, do all the
unit tests pass with this patch?

Overall, axis sharing sounds a lot like linkaxes() in Matlab
<http://www.mathworks.com/help/matlab/ref/linkaxes.html>. If axis *sharing*
doesn't work, maybe axis *synchronization* could.

Daniel


On Mon, May 16, 2016 at 2:54 PM Thomas Caswell <tcaswell at gmail.com> wrote:

> We have a number of other cases where we mix types on input.  I have also
> wanted `squeeze='flatten'` on a few occasions and am +1 on the first idea
>
> I am a bit more hesitant on the second, it might be crossing the line into
> making the API too clever/flexible for its own good.
>
> Tom
>
> On Mon, May 16, 2016 at 2:06 PM Christopher Field <
> christophertfield at gmail.com> wrote:
>
>>         I love pyplot.subplots and use it to create almost all of my
>> graphs. I have implemented code for two subplots enhancements. Because I
>> have never contributed to an open source project, I wanted to clear the
>> additions before I put in the effort to learn how to make a contribution
>> and implement all of the supporting documentation and samples.
>>
>>         I found that was often writing
>> Fig, ax = plt.subplots( N, M, squeeze=False )
>> ax = ax.flatten()         or ax=ax.ravel()
>>         My addition provides a squeeze=‘flatten’ option, which always
>> returns a 1D numpy array.  This is useful under three situations. First,
>> there is a 2D arrangement of plots that are to be populated by indexing in
>> a single loop. Second, there is a  1D arrangement of plots of variable
>> number which, if squeeze=True, might return a single axis or a numpy array.
>> Third, there is a 2D arrangement of plots that you wish to access with a
>> single subscript.
>>         Does providing squeeze with bool or string values violate any
>> rules?
>>         What is the clearest string to use? I have considered ‘flatten’,
>> ‘flat’, ‘ravel’, and ‘1d’.
>>
>>         The second enhancement permits sharing axis between different
>> figures. It extends the sharex and sharey arguments to accept either an
>> axis instance (in which case all of the new plots share the same x or y
>> limits), or 1D or 2D numpy arrays of axis instances (in which case
>> rows/columns are shared or each plot shares with the corresponding plot
>> passed in.
>>
>>         Should I invest the effort required to submit these? Is there a
>> time frame in which these additions would be more or less welcome?
>>
>> Thank you,
>> Christopher Field
>>
>>
>>
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