casacore::TableExprGroupVarianceDouble Class Reference

Aggregate class determining the variance of values in a group. More...

#include <ExprGroupAggrFunc.h>

Inheritance diagram for casacore::TableExprGroupVarianceDouble:

Public Member Functions
	TableExprGroupVarianceDouble (TableExprNodeRep *node, uInt ddof)
virtual	~TableExprGroupVarianceDouble ()
virtual void	apply (const TableExprId &id)
	Get the operand's value for the given row and apply it to the aggregation. More...
virtual void	finish ()
	If needed, finish the aggregation. More...
Public Member Functions inherited from casacore::TableExprGroupFuncDouble
	TableExprGroupFuncDouble (TableExprNodeRep *node, Double initValue=0)
virtual	~TableExprGroupFuncDouble ()
virtual Double	getDouble (const vector< TableExprId > &)
Public Member Functions inherited from casacore::TableExprGroupFuncBase
	TableExprGroupFuncBase (TableExprNodeRep *node)
	Construct from the TaQL aggregation node. More...
virtual	~TableExprGroupFuncBase ()
virtual Bool	isLazy () const
	Does the aggregate function use lazy semantics? The default implementation returns False. More...
uInt	seqnr () const
	Get the function's sequence nr. More...
void	setSeqnr (uInt seqnr)
	Set the function's sequence nr. More...
virtual CountedPtr< vector < TableExprId > >	getIds () const
	Get the assembled TableExprIds of a group. More...
virtual Bool	getBool (const vector< TableExprId > &=vector< TableExprId >())
	Get the aggregated value. More...
virtual Int64	getInt (const vector< TableExprId > &=vector< TableExprId >())
virtual DComplex	getDComplex (const vector< TableExprId > &=vector< TableExprId >())
virtual MVTime	getDate (const vector< TableExprId > &=vector< TableExprId >())
virtual String	getString (const vector< TableExprId > &=vector< TableExprId >())
virtual MArray< Bool >	getArrayBool (const vector< TableExprId > &=vector< TableExprId >())
virtual MArray< Int64 >	getArrayInt (const vector< TableExprId > &=vector< TableExprId >())
virtual MArray< Double >	getArrayDouble (const vector< TableExprId > &=vector< TableExprId >())
virtual MArray< DComplex >	getArrayDComplex (const vector< TableExprId > &=vector< TableExprId >())
virtual MArray< MVTime >	getArrayDate (const vector< TableExprId > &=vector< TableExprId >())
virtual MArray< String >	getArrayString (const vector< TableExprId > &=vector< TableExprId >())

Protected Attributes
uInt	itsDdof
Int64	itsNr
Double	itsCurMean
Protected Attributes inherited from casacore::TableExprGroupFuncDouble
Double	itsValue
Protected Attributes inherited from casacore::TableExprGroupFuncBase
TableExprNodeRep *	itsNode
TableExprNodeRep *	itsOperand
uInt	itsSeqnr

Detailed Description

Aggregate class determining the variance of values in a group.

Intended use:

Internal

Review Status

Test programs:

tExprGroup

Synopsis

Aggregate class determining the variance of values in a group. It uses a running algorithm (see en.wikipedia.org/wiki/Algorithms_for_calculating_variance)

Definition at line 352 of file ExprGroupAggrFunc.h.

Constructor & Destructor Documentation

casacore::TableExprGroupVarianceDouble::TableExprGroupVarianceDouble ( TableExprNodeRep *  node, uInt  ddof  )

explicit

virtual casacore::TableExprGroupVarianceDouble::~TableExprGroupVarianceDouble ( )

virtual

Member Function Documentation

virtual void casacore::TableExprGroupVarianceDouble::apply ( const TableExprId &  id )

virtual

Get the operand's value for the given row and apply it to the aggregation.

This function should not be called for lazy classes.

Implements casacore::TableExprGroupFuncBase.

virtual void casacore::TableExprGroupVarianceDouble::finish ( )

virtual

If needed, finish the aggregation.

By default nothing is done.

Reimplemented from casacore::TableExprGroupFuncBase.

Reimplemented in casacore::TableExprGroupStdDevDouble.

Member Data Documentation

Double casacore::TableExprGroupVarianceDouble::itsCurMean

protected

Definition at line 362 of file ExprGroupAggrFunc.h.

uInt casacore::TableExprGroupVarianceDouble::itsDdof

protected

Definition at line 360 of file ExprGroupAggrFunc.h.

Int64 casacore::TableExprGroupVarianceDouble::itsNr

protected

Definition at line 361 of file ExprGroupAggrFunc.h.

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The documentation for this class was generated from the following file:

• tables/TaQL/ExprGroupAggrFunc.h