xarray.core.rolling_exp.RollingExp

class xarray.core.rolling_exp.RollingExp(obj, windows, window_type='span')

Exponentially-weighted moving window object. Similar to EWM in pandas

Parameters

• obj (Dataset or DataArray) – Object to window.

• windows (A single mapping from a single dimension name to window value) –

  dimstr

  Name of the dimension to create the rolling exponential window along (e.g., time).

  windowint

  Size of the moving window. The type of this is specified in window_type

• window_type (str, one of ['span', 'com', 'halflife', 'alpha'], default 'span') – The format of the previously supplied window. Each is a simple numerical transformation of the others. Described in detail: https://pandas.pydata.org/pandas-docs/stable/generated/pandas.DataFrame.ewm.html

Returns

RollingExp

Return type

type of input argument

__init__(obj, windows, window_type='span')

Initialize self. See help(type(self)) for accurate signature.

Methods

__init__(obj, windows[, window_type])	Initialize self.
mean()	Exponentially weighted moving average