casacore::TableExprGroupVariancesArrayDouble Class Reference

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

#include <ExprGroupAggrFuncArray.h>

Inheritance diagram for casacore::TableExprGroupVariancesArrayDouble:

List of all members.

Public Member Functions
	TableExprGroupVariancesArrayDouble (TableExprNodeRep *node)
virtual	~TableExprGroupVariancesArrayDouble ()
virtual void	apply (const TableExprId &id)
	Get the operand's value for the given row and apply it to the aggregation.
virtual void	finish ()
	If needed, finish the aggregation.
Protected Attributes
Array< Int64 >	itsNr
Array< Double >	itsMean

---

Detailed Description

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

Intended use:

Internal

Review Status

Test programs:

tExprGroup

Synopsis

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

Definition at line 745 of file ExprGroupAggrFuncArray.h.

---

Constructor & Destructor Documentation

casacore::TableExprGroupVariancesArrayDouble::TableExprGroupVariancesArrayDouble

(

TableExprNodeRep *

node

)

virtual casacore::TableExprGroupVariancesArrayDouble::~TableExprGroupVariancesArrayDouble

(

)

[virtual]

---

Member Function Documentation

virtual void casacore::TableExprGroupVariancesArrayDouble::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::TableExprGroupVariancesArrayDouble::finish

(

)

[virtual]

If needed, finish the aggregation.

By default nothing is done.

Reimplemented from casacore::TableExprGroupFuncBase.

Reimplemented in casacore::TableExprGroupStdDevsArrayDouble.

---

Member Data Documentation

Array<Double> casacore::TableExprGroupVariancesArrayDouble::itsMean [protected]

Definition at line 754 of file ExprGroupAggrFuncArray.h.

Array<Int64> casacore::TableExprGroupVariancesArrayDouble::itsNr [protected]

Definition at line 753 of file ExprGroupAggrFuncArray.h.

---

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

• casacore/tables/TaQL/ExprGroupAggrFuncArray.h