pynbody.util.relative_slice

pynbody.util.relative_slice(s_relative_to, s)

Given a slice s, return a slice s_prime with the property that array[s_relative_to][s_prime] == array[s]. Clearly this will not be possible for arbitrarily chosen s_relative_to and s, but it should be possible for s=intersect_slices(s_relative_to, s_any) which is the use case envisioned here (and used by SubSim). This code currently does not work with end-relative (i.e. negative) start or stop positions.