pynbody.filt.Not

class pynbody.filt.Not(f)

Bases: Filter

A filter that selects particles that are not in another filter.

You can construct this filter conveniently using the ~ operator, i.e.

>>> f = ~f1

returns a filter that selects particles that are not in f1.

Methods

__call__(sim)	Return a boolean mask indicating which particles are in the filter.
cubic_cell_intersection(centroids)	Compute the intersection with cubic cells with the specified centroids.
where(sim)	Return the indices of particles that are in the filter.

__init__(f)

cubic_cell_intersection(centroids)

Compute the intersection with cubic cells with the specified centroids.

This is currently used by the swift loader to figure out which cells to load

where(sim: snapshot.SimSnap)

Return the indices of particles that are in the filter.

This is a convenience method that is equivalent to np.where(f(sim)) but may be more efficient for some filters.