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casacore::TableExprGroupVarianceDouble Class Reference

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

#include <ExprGroupAggrFunc.h>

Inheritance diagram for casacore::TableExprGroupVarianceDouble:
casacore::TableExprGroupFuncDouble casacore::TableExprGroupFuncBase casacore::TableExprGroupStdDevDouble

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< BoolgetArrayBool (const vector< TableExprId > &=vector< TableExprId >())
 
virtual MArray< Int64getArrayInt (const vector< TableExprId > &=vector< TableExprId >())
 
virtual MArray< DoublegetArrayDouble (const vector< TableExprId > &=vector< TableExprId >())
 
virtual MArray< DComplex > getArrayDComplex (const vector< TableExprId > &=vector< TableExprId >())
 
virtual MArray< MVTimegetArrayDate (const vector< TableExprId > &=vector< TableExprId >())
 
virtual MArray< StringgetArrayString (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
TableExprNodeRepitsNode
 
TableExprNodeRepitsOperand
 
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.


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