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Computes the bounds of a window.
Parameters
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num_values : int, default 0
number of values that will be aggregated over
window_size : int, default 0
the number of rows in a window
min_periods : int, default None
min_periods passed from the top level rolling API
center : bool, default None
center passed from the top level rolling API
closed : str, default None
closed passed from the top level rolling API
win_type : str, default None
win_type passed from the top level rolling API
Returns
-------
A tuple of ndarray[int64]s, indicating the boundaries of each
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Creates window boundaries for fixed-length windows that include the
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Examples
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>>> df = pd.DataFrame({'B': [0, 1, 2, np.nan, 4]})
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B
0 0.0
1 1.0
2 2.0
3 NaN
4 4.0
>>> indexer = pd.api.indexers.FixedForwardWindowIndexer(window_size=2)
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B
0 1.0
1 3.0
2 2.0
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4 4.0
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