casacore::TableExprGroupVarianceArrayDouble Class Reference

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

#include <ExprGroupAggrFuncArray.h>

Inheritance diagram for casacore::TableExprGroupVarianceArrayDouble:

List of all members.

Public Member Functions
	TableExprGroupVarianceArrayDouble (TableExprNodeRep *node)
virtual	~TableExprGroupVarianceArrayDouble ()
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
Int64	itsNr
Double	itsM2

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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 315 of file ExprGroupAggrFuncArray.h.

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Constructor & Destructor Documentation

casacore::TableExprGroupVarianceArrayDouble::TableExprGroupVarianceArrayDouble

(

TableExprNodeRep *

node

)

virtual casacore::TableExprGroupVarianceArrayDouble::~TableExprGroupVarianceArrayDouble

(

)

[virtual]

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Member Function Documentation

virtual void casacore::TableExprGroupVarianceArrayDouble::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::TableExprGroupVarianceArrayDouble::finish

(

)

[virtual]

If needed, finish the aggregation.

By default nothing is done.

Reimplemented from casacore::TableExprGroupFuncBase.

Reimplemented in casacore::TableExprGroupStdDevArrayDouble.

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Member Data Documentation

Double casacore::TableExprGroupVarianceArrayDouble::itsM2 [protected]

Definition at line 324 of file ExprGroupAggrFuncArray.h.

Int64 casacore::TableExprGroupVarianceArrayDouble::itsNr [protected]

Definition at line 323 of file ExprGroupAggrFuncArray.h.

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

• casacore/tables/TaQL/ExprGroupAggrFuncArray.h