pynbody.halo.details.iord_mapping.make_iord_to_offset_mapper

pynbody.halo.details.iord_mapping.make_iord_to_offset_mapper(iord: ndarray) → IordToOffset

Given an array of unique integers, iord, make an object which maps from an iord value to offset in the array.

i.e. given an iord array and a subset of values my_iord_values,

make_iord_to_offset_mapper(iord).map_ignoring_order(my_iord_values)

returns the indexes of my_iord_values in the iord array.