mars.dataframe.DataFrame.expanding#
- DataFrame.expanding(min_periods=1, center=False, axis=0)#
Provide expanding transformations.
- 参数
- 返回类型
a Window sub-classed for the particular operation
提示
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
.实际案例
>>> 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