Question

This is my first attempt at playing with Pandas library after attending Wesley’s tutorial at pycon.

After poking around a bit with the dataframe I am glad I was able to massage the data in the way I wanted but having trouble in plotting it. I guess it also points to my naiveness with the matplotlib library.

What I have is pandas Series object with the following data. I would like to plot as a barplot with col 1 (‘file’) as the labels oriented vertically.

sample data here:
http://pastebin.com/y2w0uJPQ 

Answer 1

I’ve just implemented a stacked bar plot function in the git repository for pandas, will be part of the upcoming 0.7.3 release:

In [7]: df
Out[7]: 
          a         b         c
0  0.425199  0.564161  0.727342
1  0.174849  0.071170  0.679178
2  0.224619  0.331846  0.468959
3  0.654766  0.189413  0.868011
4  0.617331  0.715088  0.387540
5  0.444001  0.069016  0.417990
6  0.203908  0.689652  0.227135
7  0.382930  0.874078  0.571042
8  0.658687  0.493955  0.245392
9  0.758986  0.385871  0.455357

In [8]: df.plot(kind='barh', stacked=True)

It properly handles positive and negative values (stacking negative values below the origin and positive values above)