pandas.core.window.Expanding.apply

The expanding function’s apply function.

param func

function

Must produce a single value from an ndarray input if raw=True or a single value from a Series if raw=False.

param raw

bool, default None

• Falsepasses each row or column as a Series to the

  function.

• True or Nonethe passed function will receive ndarray

  objects instead. If you are just applying a NumPy reduction function this will achieve much better performance.

The raw parameter is required and will show a FutureWarning if not passed. In the future raw will default to False.

New in version 0.23.0.

Arguments and keyword arguments to be passed into func.

return

Series or DataFrame Return type is determined by the caller.

Warning

This feature is currently unsupported by Intel Scalable Dataframe Compiler