ytree.data_structures.arbor.CatalogArbor

class ytree.data_structures.arbor.CatalogArbor(filename)

Base class for Arbors created from a series of halo catalog files where the descendent ID for each halo has been pre-determined.

Unlike formats where tree information is stored in single file, halos are scattered about multiple catalog files. This requires us to store the root TreeNode objects and their full assemblies.

__init__(filename)

Initialize an Arbor given an input file.

Methods

__init__(filename)	Initialize an Arbor given an input file.
add_alias_field(alias, field[, units, force_add])	Add a field as an alias to another field.
add_analysis_field(name, units[, dtype, default])	Add an empty field to be filled by analysis operations.
add_derived_field(name, function[, units, ...])	Add a field that is a function of other fields.
add_vector_field(name[, vector_components])	Add vector fields for a set of x,y,z component fields.
get_nodes_from_selection(*args, **kwargs)
get_yt_selection(*args, **kwargs)
is_grown(tree_node)	Return True if a tree has been fully assembled, i.e., the hierarchy of ancestor tree nodes has been built.
is_setup(tree_node)	Return True if arrays of uids and descendent uids have been read in.
query(key)	If given a string, return an array of field values for the roots of all trees.
reload_arbor()
reset_node(tree_node)	Reset all data structures for a single node.
save_arbor(**kwargs)	Save the arbor to a file.
select_halos(criteria[, trees, select_from, ...])	Select halos from the arbor based on a set of criteria given as a string.
set_selector(selector, *args, **kwargs)	Sets the tree node selector to be used.

Attributes

arr	Create a unyt_array using the Arbor's unit system.
box_size	The simulation box size.
container	Helper function for creating NodeContainer objects.
cosmology	Cosmology calculator with self-consistent parameters and units.
field_info	A dictionary containing information for each available field.
hubble_constant	Value of the Hubble parameter.
is_planted	Determine if trees have been planted.
omega_lambda
omega_matter
omega_radiation
quan	Create a unyt_quantity using the Arbor's unit system.
size	Return total number of trees.
unit_registry	Unit system registry.
ytds