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TST: Correct results with np.size and crosstab (#4003) #14755

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Dec 10, 2016
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TST: Correct results with np.size and crosstab (#4003) #14755

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35 changes: 35 additions & 0 deletions pandas/tools/tests/test_pivot.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1281,6 +1281,41 @@ def test_crosstab_with_categorial_columns(self):
columns=expected_columns)
tm.assert_frame_equal(result, expected)

def test_crosstab_with_numpy_size(self):
# GH 4003
df = pd.DataFrame({'A': ['one', 'one', 'two', 'three'] * 6,
'B': ['A', 'B', 'C'] * 8,
'C': ['foo', 'foo', 'foo', 'bar', 'bar', 'bar'] * 4,
'D': np.random.randn(24),
'E': np.random.randn(24)})
result = pd.crosstab(index=[df['A'], df['B']],
columns=[df['C']],
margins=True,
aggfunc=np.size,
values=df['D'])
expected_index = pd.MultiIndex(levels=[['All', 'one', 'three', 'two'],
['', 'A', 'B', 'C']],
labels=[[1, 1, 1, 2, 2, 2, 3, 3, 3, 0],
[1, 2, 3, 1, 2, 3, 1, 2, 3, 0]],
names=['A', 'B'])
expected_column = pd.Index(['bar', 'foo', 'All'],
dtype='object',
name='C')
expected_data = np.array([[2., 2., 4.],
[2., 2., 4.],
[2., 2., 4.],
[2., np.nan, 2.],
[np.nan, 2., 2.],
[2., np.nan, 2.],
[np.nan, 2., 2.],
[2., np.nan, 2.],
[np.nan, 2., 2.],
[12., 12., 24.]])
expected = pd.DataFrame(expected_data,
index=expected_index,
columns=expected_column)
tm.assert_frame_equal(result, expected)


if __name__ == '__main__':
import nose
Expand Down