Series.
expanding
Provide expanding transformations.
min_periods (int, default 1) –
number of observations in window required to have a value (Minimum) –
result is NA) ((otherwise) –
center (bool, default False) –
the labels at the center of the window. (Set) –
axis (int or str, default 0) –
a Window sub-classed for the particular operation
See also
rolling
Provides rolling window calculations.
ewm
Provides exponential weighted functions.
Notes
By default, the result is set to the right edge of the window. This can be changed to the center of the window by setting center=True.
center=True
Examples
>>> import numpy as np >>> import mars.dataframe as md >>> df = md.DataFrame({'B': [0, 1, 2, np.nan, 4]}) >>> df.execute() B 0 0.0 1 1.0 2 2.0 3 NaN 4 4.0 >>> df.expanding(2).sum().execute() B 0 NaN 1 1.0 2 3.0 3 3.0 4 7.0