mars.dataframe.Series.expanding#
- Series.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
备注
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
.示例
>>> 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