10000 fix issue #8000 - interpolation extrapolates over trailing missing values by grahamjeffries · Pull Request #8013 · pandas-dev/pandas · GitHub
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fix issue #8000 - interpolation extrapolates over trailing missing values #8013

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fix issue #8000 - interpolation extrapolates over trailing missing values #8013

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a697687
changes to avoid extrapolating over missing data
grahamjeffries Aug 12, 2014
b92fe67
test that interpolate doesn't extrapolate
grahamjeffries Aug 13, 2014
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test that interpolate doesn't extrapolate 
Added a test that confirms that linear interpolation of a Series does not extrapolate over missing data that trails the last known value.
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@grahamjeffries
grahamjeffries committed Aug 13, 2014
commit b92fe67a15a8a97f716a4b240d893dbc64e4dd66
6 changes: 6 additions & 0 deletions pandas/tests/test_generic.py
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Expand Up @@ -638,6 +638,12 @@ def test_interp_datetime64(self):
result = df.interpolate(method='nearest')
expected = Series([1., 1., 3.], index=date_range('1/1/2000', periods=3))
assert_series_equal(result, expected)

def test_interp_trailing_nan(self):
s = Series([np.nan, 1, np.nan, 3, np.nan])
result = s.interpolate()
expected = Series([np.nan, 1, 2, 3, np.nan])
assert_series_equal(result, expected)

def test_describe(self):
_ = self.series.describe()
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