Arbor.set_selector(selector, *args, **kwargs)

Sets the tree node selector to be used.

This sets the manner in which halo progenitors are chosen from a list of ancestors. The most obvious example is to select the most massive ancestor.

selector : string
Name of the selector to be used.

Any additional arguments and keywords to be provided to the selector function should follow.

>>> import ytree
>>> a = ytree.load("rockstar_halos/trees/tree_0_0_0.dat")
>>> a.set_selector("max_field_value", "mass")