elphick.geomet.utils.size.mean_size

elphick.geomet.utils.size.mean_size(size_intervals)[source]

Geometric mean size

Size calculations are performed using the geometric mean, not the arithmetic mean

NOTE: If geometric mean is used for the pan fraction (0.0mm retained) it will return zero, which is an edge size not mean size. So the mean ratio of the geometric mean to the arithmetic mean for all other fractions is used for the bottom fraction.

Parameters:: size_intervals (Union[IntervalArray, IntervalIndex]) – A pandas IntervalArray or IntervalIndex
Return type:: ndarray

Returns: