As discussed in #6063:
I noticed that that numpy-style access breaks sometimes under 0.13. While I haven't been able to pin-point the issue, calls like pylab.hist(-df.ix[row, col_name]) fail with some x[0] index error and I have to use pylab.hist(-df.ix[row, col_name]).values.
Here is a csv file for which this happens: https://gist.github.com/8651509
plt.hist(pd.read_csv('debug.csv'))
produces:
--------------------------------------------------------------------------
KeyError Traceback (most recent call last)
<ipython-input-203-b20a1ff5d1db> in <module>()
----> 1 hist(pd.load('debug.pickle'))
/home/ipython/envs/ipynb/local/lib/python2.7/site-packages/matplotlib/pyplot.pyc in hist(x, bins, range, normed, weights, cumulative, bottom, histtype, align, orientation, rwidth, log, color, label, stacked, hold, **kwargs)
2825 histtype=histtype, align=align, orientation=orientation,
2826 rwidth=rwidth, log=log, color=color, label=label,
-> 2827 stacked=stacked, **kwargs)
2828 draw_if_interactive()
2829 finally:
/home/ipython/envs/ipynb/local/lib/python2.7/site-packages/matplotlib/axes.pyc in hist(self, x, bins, range, normed, weights, cumulative, bottom, histtype, align, orientation, rwidth, log, color, label, stacked, **kwargs)
8247 # Massage 'x' for processing.
8248 # NOTE: Be sure any changes here is also done below to 'weights'
-> 8249 if isinstance(x, np.ndarray) or not iterable(x[0]):
8250 # TODO: support masked arrays;
8251 x = np.asarray(x)
/home/ipython/envs/ipynb/local/lib/python2.7/site-packages/pandas/core/series.pyc in __getitem__(self, key)
482 def __getitem__(self, key):
483 try:
--> 484 result = self.index.get_value(self, key)
485 if isinstance(result, np.ndarray):
486 return self._constructor(result,index=[key]*len(result)).__finalize__(self)
/home/ipython/envs/ipynb/local/lib/python2.7/site-packages/pandas/core/index.pyc in get_value(self, series, key)
1030
1031 try:
-> 1032 return self._engine.get_value(s, k)
1033 except KeyError as e1:
1034 if len(self) > 0 and self.inferred_type == 'integer':
/home/ipython/envs/ipynb/local/lib/python2.7/site-packages/pandas/index.so in pandas.index.IndexEngine.get_value (pandas/index.c:2890)()
/home/ipython/envs/ipynb/local/lib/python2.7/site-packages/pandas/index.so in pandas.index.IndexEngine.get_value (pandas/index.c:2702)()
/home/ipython/envs/ipynb/local/lib/python2.7/site-packages/pandas/index.so in pandas.index.IndexEngine.get_loc (pandas/index.c:3440)()
/home/ipython/envs/ipynb/local/lib/python2.7/site-packages/pandas/hashtable.so in pandas.hashtable.Int64HashTable.get_item (pandas/hashtable.c:6595)()
/home/ipython/envs/ipynb/local/lib/python2.7/site-packages/pandas/hashtable.so in pandas.hashtable.Int64HashTable.get_item (pandas/hashtable.c:6536)()
KeyError: 0
While passing .values works.
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