Better example documentation of using Pandas Dataframes? about holoviews HOT 10 CLOSED

Thanks for the feedback. I had actually planned on splitting the Pandas/Seaborn tutorial into two separate notebooks. The first will focus on the Pandas conversion interface, which allows you to convert a Pandas pd.dataframe of any number of columns into HoloViews objects (and the reverse). While the second will focus on the specialized plots that pandas and seaborn provide. I'll try to get that uploaded by tomorrow.

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I finally added a new Pandas conversion tutorial, which takes a more step-by-step approach to working with dataframes in HoloViews. Note that the API for conversion isn't necessarily fixed and could certainly use some improvements. Any and all feedback of how to improve the API itself or to make the Tutorial clearer is welcome.

I'll also be updating the Pandas and Seaborn in the near future to provide a reference to the additional conversion types and make it a bit clearer how to use the DFrame Element to visualize some of the Seaborn Grid types, e.g. FacetGrid and PairGrid, directly. For now I'll close this issue, if you have any specific questions or problems feel free to open another issue.

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That looks great! Will dig into it..

On Tue, Mar 24, 2015 at 9:36 AM, Philipp Rudiger [email protected]
wrote:

Closed #24 #24.

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#24 (comment).

Tom Brander
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I downloaded the notebook and all ran as expected except the 1st Multiple Keys Dimensions example:
Other subsequent example run fine..

%%opts Bars aspect=3 figure_size=400 category_index=2 stack_index=0 group_index=1 color_by=['stack']
macro.bars(['country', 'year'], 'trade', reduce_fn=np.mean)

Traceback (most recent call last):
File "/usr/local/lib/python2.7/dist-packages/holoviews/ipython/display_hooks.py", line 190, in wrapped
*_kwargs)
File "/usr/local/lib/python2.7/dist-packages/holoviews/ipython/display_hooks.py", line 220, in element_display
*_opts(element, get_plot_size(element, size)))()
File "/usr/local/lib/python2.7/dist-packages/holoviews/plotting/chart.py", line 779, in call
self.handles['bars'], xticks = self._create_bars(axis, element)
File "/usr/local/lib/python2.7/dist-packages/holoviews/plotting/chart.py", line 866, in _create_bars
for cg in self.color_by if indices[cg] < ndims]
IndexError: list index out of range

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Yes, thanks for reporting back. There was a bug in the Bar plotting code, which I only just fixed. If you're using a Git clone simply pull the latest commits, otherwise we'll be uploading a bugfix release to PyPi later tonight.

In fact the Bars plot is one of the latest Elements we added and also one of the most complex. I'll be improving it and adding more plot options to customize it gradually.

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I was just browsing the commits and saw you working in the area, and that you are planning to update to pypi,, I did try to do a pip install update from github just now and got.. (on two attempts)
FWIW...
sudo pip install -U https://github.com/ioam/holoviews.gitDownloading/unpacking https://github.com/ioam/holoviews.git

return fp.read().decode('utf-8')

File "/usr/lib/python2.7/encodings/utf_8.py", line 16, in decode
return codecs.utf_8_decode(input, errors, True)
UnicodeDecodeError: 'utf8' codec can't decode byte 0x8b in position 1: invalid start byte

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When pip installing directly from git you'll need to prepend git+ to the url, so the working command is as follows:

sudo pip install -U git+https://github.com/ioam/holoviews.git

Note that this may take a while as it's pulling in our testing reference_data, which is fairly large. Edit: Actually I don't think it does, so I don't know why it takes so long.

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And it does take a long time to DL... Cancelled it once and restarted...

All set now, except using IPython NB 3:
%output holomap='widgets'
ERROR: Line magic function %output not found.
Although everything looks and works fine now...

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We'll investigate why it takes so long, but we'll also try to upload frequent minor and bug fix releases to PyPI, so it can be downloaded quickly. The %output line was my fault, it should be moved to after the %load_ext holoviews.ipython line, pushed that fix to git.

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Awesome product, can't wait to use, thanks for the help.

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