common_ids(descendent_ids, ancestor_ids, threshold=0.5)¶
Determine if at least a given fraction of ancestor’s member particles are in the descendent.
- 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.
True or False