ytree.tree_farm.ancestry_checker.common_ids¶

ytree.tree_farm.ancestry_checker.common_ids(descendent_ids, ancestor_ids, threshold=0.5)[source]¶

Determine if at least a given fraction of ancestor’s member particles are in the descendent.

Parameters:	descendent_ids (list of ints) – Member ids for first halo. ancestor_ids (list of int) – Member ids for second halo. threshold (float, optional) – Critical fraction of ancestor’s particles ending up in the descendent to be considered a true ancestor. Default: 0.5.
Returns:
Return type:	True or False