pynbody.util.indexing_tricks.intersect_slices

pynbody.util.indexing_tricks.intersect_slices#

pynbody.util.indexing_tricks.intersect_slices(s1, s2, array_length=None)[source]#

Given two python slices s1 and s2, return a slice that picks out all members of s1 and s2.

That is, if d is an array, then d[intersect_slices(s1,s2,len(d))] returns all elements of d that are in both d[s1] and d[s2].

Note that it may not be possible to do this without information on the length of the array referred to, hence all slices with end-relative indexes are first converted into begin-relative indexes. The slice returned may be specific to the length specified.

If the slices are mutually exclusive, a zero-length slice is returned.

Parameters:

  • s1 (slice) – The first slice

  • s2 (slice) – The second slice

  • array_length (int, optional) – The length of the array to which the slices refer. If not specified, the slices must have positive start and stop.

Returns:

A slice that picks out all elements of s1 and s2, as described above.

Return type:

slice