lsst.afw.table.multiMatch.GroupView Class Reference

Inheritance diagram for lsst.afw.table.multiMatch.GroupView:

Public Member Functions
def	build
	Construct a GroupView from a concatenated catalog. More...
def	__init__
def	__len__
def	__iter__
def	__getitem__
def	where
def	aggregate
	Run an aggregate function on each group, returning an array with one element for each group. More...
def	apply
	Run a non-aggregate function on each group, returning an array with one element for each record. More...

Public Attributes
	schema
	ids
	groups
	count

Detailed Description

A mapping (i.e. dict-like object) that provides convenient operations on the concatenated
catalogs returned by a MultiMatch object.

A GroupView provides access to a catalog of grouped objects, in which the grouping is indicated by
a field for which all records in a group have the same value.  Once constructed, it allows operations
similar to those supported by SQL "GROUP BY", such as filtering and aggregate calculation.

Definition at line 123 of file multiMatch.py.

Constructor & Destructor Documentation

def lsst.afw.table.multiMatch.GroupView.__init__	(		self,
			schema,
			ids,
			groups
	)

Direct constructor; most users should call build() instead.

This constructor takes the constituent arrays of the object directly, to allow multiple
methods for construction.

Definition at line 149 of file multiMatch.py.

    def __init__(self, schema, ids, groups):
        """Direct constructor; most users should call build() instead.

        This constructor takes the constituent arrays of the object directly, to allow multiple
        methods for construction.
        """
        self.schema = schema
        self.ids = ids
        self.groups = groups
        self.count = sum(len(cat) for cat in self.groups)