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louist87 opened this issue Sep 14, 2012 · 4 comments
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Support for hierarchical labeling of bar-plots #1257

louist87 opened this issue Sep 14, 2012 · 4 comments
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status: duplicate third-party integration topic: categorical
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v2.2.0

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@louist87
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With the increasing popularity of the Pandas data-analysis library, more and more users can be expected to want to plot hierarchically organized data.

Below is an example of a Pandas dataframe:

Group Local Global Attn  mean
ASub  LD    GD     Attn    -0
                   Dist    -0
            GS     Attn    -0
                   Dist    -0
      LS    GD     Attn    -0
                   Dist    -0
            GS     Attn    -0
                   Dist    -0
DSub  LD    GD     Attn    -0
                   Dist     0
            GS     Attn    -0
                   Dist    -0
      LS    GD     Attn    -0
                   Dist    -0
            GS     Attn    -0
                   Dist    -0

(Note that the above mean column values are not zero, but very small floats)

And here is the resulting matplotlib.pyplot bar graph:
Graphical representation of above data. Note that the values are not zero, but extremely small floats

It would be nice, and I imagine relatively simple, to add support for hierarchical labeling of the x-axis. For clarity, I mean that I should be able to create a tree-like structure of labels that shows how the left half of the bars belong to the ASub group, the left half of which belongs to the LD group of the Local parameter, etc...

Thoughts?
@dmcdougall
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Could you maybe draw a quick and dirty prototype of how you think this should look?

@louist87
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@dmcdougall, Sure thing!

Below is the best solution I've come across so far, and it was generated with the plotting functions in Pandas. My understanding is that matplotlib subtends the plotting functionality of Pandas, but that Pandas has a few extra functions that make it easier to plot DataFrames and such. (I could be wrong about this).

In any case, this is more or less what I was shooting for, although it could be prettier:

pandas plot output

It would be nice if we could do something like this:

Hierarchical labelling concept

Does this make things clear?

@WeatherGod
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Yes, that makes things clearer, at least to me.

One possible way to go about this is to interpret a dictionary of data to
mean hierarchical display (one would presumedly use OrderedDictionary if
they care about the order the bars show up. The key would be the label,
and the value could be a numerical value or another dictionary. Note,
though, I don't think we usually play around with axis labels like this
from within the bar() function. Furthermore, bar() is already a major
beast of a function. I would tread carefully here.

@gjx gjx mentioned this issue Oct 20, 2012
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@tacaswell tacaswell mentioned this issue Jan 17, 2014
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@story645 story645 mentioned this issue May 31, 2016
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@story645 story645 mentioned this issue Aug 3, 2016
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@tacaswell tacaswell modified the milestones: 2.1 (next point release), 2.2 (next next feature release) Sep 24, 2017
@anntzer
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anntzer commented Nov 24, 2017

I agree with @story645 that #6321 is a dupe, but I'll close this one as the other has what I believe is a clearer example graph.

@anntzer anntzer closed this as completed Nov 24, 2017
@QuLogic QuLogic modified the milestones: needs sorting, v2.2.0 Feb 12, 2018
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