casa::SetJyGridFT Class Reference

An FTMachine for Gridded Fourier transforms specializing in setjy frequency scaling. More...

#include <SetJyGridFT.h>

Inheritance diagram for casa::SetJyGridFT:

List of all members.

Public Member Functions
	SetJyGridFT (Long cachesize, Int tilesize, String convType, MPosition mLocation, MDirection mTangent, Float passing=1.0, Bool usezero=True, Bool useDoublePrec=False, const Vector< Double > &freqscale=Vector< Double >(1, 0.0), const Vector< Double > &scale=Vector< Double >(1, 1.0))
	Constructor: cachesize is the size of the cache in words (e.g.
	SetJyGridFT (const RecordInterface &stateRec)
	Construct from a Record containing the GridFT state.
	SetJyGridFT (const SetJyGridFT &other)
	Copy constructor.
SetJyGridFT &	operator= (const SetJyGridFT &other)
	Assignment operator.
virtual	~SetJyGridFT ()
virtual void	initializeToVis (ImageInterface< Complex > &image, const VisBuffer &vb)
	Initialize transform to Visibility plane using the image as a template.
void	get (VisBuffer &vb, Int row=-1)
	Finalize transform to Visibility plane: flushes the image cache and shows statistics if it is being used.
virtual Bool	toRecord (String &error, RecordInterface &outRec, Bool withImage=False)
	Save and restore the GridFT to and from a record.
virtual Bool	fromRecord (String &error, const RecordInterface &inRec)
virtual void	setScale (const Vector< Double > &freq, const Vector< Double > &scale)
virtual String	name () const
	Return the name of the machine.
Protected Attributes
Vector< Double >	freqscale_p
	Prepare the grid for degridding void prepGridForDegrid();.
Vector< Double >	scale_p
Vector< Double >	interpscale_p

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Detailed Description

An FTMachine for Gridded Fourier transforms specializing in setjy frequency scaling.

Intended use:

Public interface

Prerequisite

• GridFT module
• SkyEquation module
• VisBuffer module

Etymology

Inheriting from GridFT which does Grid-based Fourier transforms. special case for setjy style frequency scaling

Synopsis

Example

Motivation

Define an interface to allow efficient processing of chunks of visibility data

Definition at line 71 of file SetJyGridFT.h.

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Constructor & Destructor Documentation

casa::SetJyGridFT::SetJyGridFT	(	Long	cachesize,
		Int	tilesize,
		String	convType,
		MPosition	mLocation,
		MDirection	mTangent,
		Float	passing = 1.0,
		Bool	usezero = True,
		Bool	useDoublePrec = False,
		const Vector< Double > &	freqscale = Vector< Double >(1, 0.0),
		const Vector< Double > &	scale = Vector< Double >(1, 1.0)
	)

Constructor: cachesize is the size of the cache in words (e.g.

a few million is a good number), tilesize is the size of the tile used in gridding (cannot be less than 12, 16 works in most cases), and convType is the type of gridding used (SF is prolate spheriodal wavefunction, and BOX is plain box-car summation). mLocation is the position to be used in some phase rotations. If mTangent is specified then the uvw rotation is done for that location iso the image center.

casa::SetJyGridFT::SetJyGridFT

(

const RecordInterface &

stateRec

)

Construct from a Record containing the GridFT state.

casa::SetJyGridFT::SetJyGridFT

(

const SetJyGridFT &

other

)

Copy constructor.

virtual casa::SetJyGridFT::~SetJyGridFT

(

)

[virtual]

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Member Function Documentation

virtual Bool casa::SetJyGridFT::fromRecord	(	String &	error,
		const RecordInterface &	inRec
	)		[virtual]

Reimplemented from casa::GridFT.

void casa::SetJyGridFT::get	(	VisBuffer &	vb,
		Int	row = -1
	)		[virtual]

Finalize transform to Visibility plane: flushes the image cache and shows statistics if it is being used.

void finalizeToVis();

Get actual coherence from grid by degridding

Reimplemented from casa::GridFT.

virtual void casa::SetJyGridFT::initializeToVis	(	ImageInterface< Complex > &	image,
		const VisBuffer &	vb
	)		[virtual]

Initialize transform to Visibility plane using the image as a template.

The image is loaded and Fourier transformed.

Reimplemented from casa::GridFT.

virtual String casa::SetJyGridFT::name

(

)

const [virtual]

Return the name of the machine.

Reimplemented from casa::GridFT.

SetJyGridFT& casa::SetJyGridFT::operator=

(

const SetJyGridFT &

other

)

Assignment operator.

virtual void casa::SetJyGridFT::setScale	(	const Vector< Double > &	freq,
		const Vector< Double > &	scale
	)		[virtual]

virtual Bool casa::SetJyGridFT::toRecord	(	String &	error,
		RecordInterface &	outRec,
		Bool	withImage = False
	)		[virtual]

Save and restore the GridFT to and from a record.

Reimplemented from casa::GridFT.

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Member Data Documentation

Vector<Double> casa::SetJyGridFT::freqscale_p [protected]

Prepare the grid for degridding void prepGridForDegrid();.

Definition at line 133 of file SetJyGridFT.h.

Vector<Double> casa::SetJyGridFT::interpscale_p [protected]

Definition at line 135 of file SetJyGridFT.h.

Vector<Double> casa::SetJyGridFT::scale_p [protected]

Definition at line 134 of file SetJyGridFT.h.

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

• code/synthesis/TransformMachines/SetJyGridFT.h