xarray_moments

PlasmaCalcs.tools.xarray_tools.xarray_sci.xarray_moments(array, dim=None)

returns Dataset of the “normalized” moments of array along dim,

with data_vars ‘moment_0’, ‘moment_1’, ‘moment_2’, where

moment_0 = sum(array) along dim

moment_1 = sum(array * x) / moment_0

moment_2 = (sum(array * x**2) / moment_0) - moment_1**2

array: xarray.DataArray

dim: str or None

dimension along which to compute the moments.

if None, array must be 1D, and uses dim = array.dims[0].