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BUG: Bug in multi-axis indexing with > 2 ndim and a multi-index (GH7199) #7202

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Merged
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May 22, 2014
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BUG: Bug in multi-axis indexing with > 2 ndim and a multi-index (GH7199) #7202

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1 change: 1 addition & 0 deletions doc/source/release.rst
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Original file line number Diff line number Diff line change
Expand Up @@ -535,6 +535,7 @@ Bug Fixes
- Bug in recognizing out-of-bounds positional list indexers with ``iloc`` and a multi-axis tuple indexer (:issue:`7189`)
- Bug in setitem with a single value, multi-index and integer indices (:issue:`7190`)
- Bug in expressions evaluation with reversed ops, showing in series-dataframe ops (:issue:`7198`, :issue:`7192`)
- Bug in multi-axis indexing with > 2 ndim and a multi-index (:issue:`7199`)

pandas 0.13.1
-------------
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5 changes: 4 additions & 1 deletion pandas/core/indexing.py
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Expand Up @@ -821,10 +821,13 @@ def _getitem_nested_tuple(self, tup):
axis += 1
continue

current_ndim = obj.ndim
obj = getattr(obj, self.name)._getitem_axis(key, axis=axis, validate_iterable=True)
axis += 1

if obj.ndim < self.ndim:
# has the dim of the obj changed?
# GH 7199
if obj.ndim < current_ndim:
axis -= 1

return obj
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32 changes: 32 additions & 0 deletions pandas/tests/test_indexing.py
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Expand Up @@ -1099,6 +1099,38 @@ def f():
p.iloc[0,[True,True,True],[2]]
self.assertRaises(IndexError, f)

# GH 7199
# Panel with multi-index
multi_index = pd.MultiIndex.from_tuples([('ONE', 'one'),
('TWO', 'two'),
('THREE', 'three')],
names=['UPPER', 'lower'])

simple_index = [x[0] for x in multi_index]
wd1 = Panel(items=['First', 'Second'],
major_axis=['a', 'b', 'c', 'd'],
minor_axis=multi_index)

wd2 = Panel(items=['First', 'Second'],
major_axis=['a', 'b', 'c', 'd'],
minor_axis=simple_index)

expected1 = wd1['First'].iloc[[True, True, True, False], [0, 2]]
result1 = wd1.iloc[0, [True, True, True, False], [0, 2]] # WRONG
assert_frame_equal(result1,expected1)

expected2 = wd2['First'].iloc[[True, True, True, False], [0, 2]]
result2 = wd2.iloc[0, [True, True, True, False], [0, 2]]
assert_frame_equal(result2,expected2)

expected1 = DataFrame(index=['a'],columns=multi_index,dtype='float64')
result1 = wd1.iloc[0,[0],[0,1,2]]
assert_frame_equal(result1,expected1)

expected2 = DataFrame(index=['a'],columns=simple_index,dtype='float64')
result2 = wd2.iloc[0,[0],[0,1,2]]
assert_frame_equal(result2,expected2)

def test_iloc_getitem_doc_issue(self):

# multi axis slicing issue with single block
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