MSRange determines ranges of values in a MeasurementSet. More...

#include <MSRange.h>

Public Types
enum	{ UNCHECKED, UNSELECTED, ALL }

Public Member Functions
	MSRange ()
	Default constructor, only useful to assign to. More...

	MSRange (const MeasurementSet &ms)
	Construct from an MS. More...

	MSRange (const MSSelector &msSel)
	construct from an MSSelector, if this constructor is used, the data will be channel selected and polarization converted as specified in the MSSelector object, and the current selection is used in the range. More...

	MSRange (const MSRange &other)
	Copy constructor. More...

MSRange &	operator= (const MSRange &other)
	Assignment. More...

Record	range (const Vector< String > &items, Bool useFlags=True, Bool OneBased=False)
	Return the range of values for each of the items specified in the record. More...

Record	range (const Vector< Int > &items, Bool useFlags=True, Bool OneBased=False)
	Same as previous function, with Vector of MSS::Field keys instead of Strings. More...

Record	range (MSS::Field item, Bool useFlags=True)
	Similar to above, with a single enum, for convenience. More...

void	setBlockSize (Int blockSize=10)
	Set the block size (in Mbytes) to use when reading the data column. More...

Protected Member Functions
Bool	checkShapes ()
	check the data description selection (one or more with same shape, or varying shape) More...

void	scalarRange (Record &out, const String &item, const ScalarColumn< Int > &id, Bool oneBased)
	get the range of a ScalarColumn<Int>, correct for 1-based indexing if oneBased is True, and add to out record. More...

Vector< Int >	scalarRange (const ScalarColumn< Int > &id)
	get the range of a ScalarColumn<Int> More...

void	minMax (Matrix< Float > &minmax, const Vector< Bool > &funcSel, const ArrayColumn< Complex > &data1, const ArrayColumn< Complex > &data2, const ArrayColumn< Bool > &flag, Int dataType, Bool useFlags)
	get the minimum and maximum of a Complex data column, after application of some function to convert to Float (e.g., real, amplitude,...). More...

void	minMax (Float &mini, Float &maxi, const ArrayColumn< Float > &data, const ArrayColumn< Bool > &flag, Bool useFlags)
	get the minimum and maximum of a Float data column This function reads the data in blocks of size blockSize, as set by the setBlockSize function. More...

Vector< Int >	ifrNumbers (const ScalarColumn< Int > &ant1, const ScalarColumn< Int > &ant2)
	Get the range of interferometer numbers given the antenna1 and antenna2 columns. More...

Private Types
enum	{ Amp, Phase, Real, Imag, Data, nFuncType }
	The function types. More...

enum	{ Observed, Corrected, Model, Ratio, Residual, ObsResidual, ObsFloat, nDataType }
	The data types. More...

Private Attributes
MeasurementSet	ms_p

Int	blockSize_p

Vector< Int >	ddId_p

Vector< uInt >	spwId_p

Vector< uInt >	polId_p

Bool	constantShape_p

const MSSelector *	sel_p

Detailed Description

MSRange determines ranges of values in a MeasurementSet.

Intended use:

Public interface

Review Status

Date Reviewed:: yyyy/mm/dd

Prerequisite

Etymology

MSRange is a class that determines ranges of values in an MS

Synopsis

This class is used to determine the range of values present for the various columns in a MeasurementSet. This class is initialized from a MeasurementSet. If the MS contains more than one DATA_DESC_ID, it can be preselected on this to allow a consistent set of frequencies to be returned. The ms DO provides access to this class from glish and GUIs.

Example

MSRange myRange(myMS);
Vector<String> items(3); 
// fill in some fields
items(0)="field_id";
items(1)="time";
items(2)="data_desc_id";
// get the range of values for the items specified
cout << myRange.range(items)<<endl;
// sample output: range=[field_id=[0,1,2],time=[4.5e9, 4.51e9],
//   data_desc_id=[0,1,2]];
// Now preselect on data_desc_id
MSSelector mss(myMS);
Vector<Int> dd(2); dd(0)=1; dd(1)=2;
mss.selectinit(0,dd); // select data desc ids 1 and 2
MSRange r2(mss);
items(2)="amplitude";
cout<< r2.range(items)<<endl;
// sample output: [field_id=[0,1,2],time=[4.5e9, 4.51e9],
//   amplitude=[0.00132,1.543]]

Motivation

Finding out the range of values in a column is often needed before a sensible selection of data can be made. This class, formerly part of MSSelector, separates out this functionality.

Thrown Exceptions

To Do

maybe add channel selection and polarization conversion

Definition at line 106 of file MSRange.h.

Member Enumeration Documentation

anonymous enum

Enumerator
UNCHECKED	spectral window selection and shapes have not been checked
UNSELECTED	multiple spectral windows with varying shapes
ALL	multiple spectral windows with same shape

Definition at line 109 of file MSRange.h.

anonymous enum

private

The function types.

Enumerator
Amp
Phase
Real
Imag
Data
nFuncType

Definition at line 203 of file MSRange.h.

anonymous enum

private

The data types.

Enumerator
Observed
Corrected
Model
Ratio
Residual
ObsResidual
ObsFloat
nDataType

Definition at line 206 of file MSRange.h.

Constructor & Destructor Documentation

casacore::MSRange::MSRange ( )

Default constructor, only useful to assign to.

casacore::MSRange::MSRange ( const MeasurementSet & ms )

explicit

Construct from an MS.

casacore::MSRange::MSRange ( const MSSelector & msSel )

explicit

construct from an MSSelector, if this constructor is used, the data will be channel selected and polarization converted as specified in the MSSelector object, and the current selection is used in the range.

casacore::MSRange::MSRange ( const MSRange & other )

Copy constructor.

Member Function Documentation

Bool casacore::MSRange::checkShapes ( )

protected

check the data description selection (one or more with same shape, or varying shape)

Vector<Int> casacore::MSRange::ifrNumbers	(	const ScalarColumn< Int > &	ant1,
		const ScalarColumn< Int > &	ant2
	)

protected

Get the range of interferometer numbers given the antenna1 and antenna2 columns.

void casacore::MSRange::minMax	(	Matrix< Float > &	minmax,
		const Vector< Bool > &	funcSel,
		const ArrayColumn< Complex > &	data1,
		const ArrayColumn< Complex > &	data2,
		const ArrayColumn< Bool > &	flag,
		Int	dataType,
		Bool	useFlags
	)

protected

get the minimum and maximum of a Complex data column, after application of some function to convert to Float (e.g., real, amplitude,...).

This function reads the data in blocks of size blockSize, as set by the setBlockSize function.

void casacore::MSRange::minMax	(	Float &	mini,
		Float &	maxi,
		const ArrayColumn< Float > &	data,
		const ArrayColumn< Bool > &	flag,
		Bool	useFlags
	)

protected

get the minimum and maximum of a Float data column This function reads the data in blocks of size blockSize, as set by the setBlockSize function.

MSRange& casacore::MSRange::operator= ( const MSRange & other )

Assignment.

Record casacore::MSRange::range	(	const Vector< String > &	items,
		Bool	useFlags = `True`,
		Bool	OneBased = `False`
	)

Return the range of values for each of the items specified in the record.

For index-like items a list of values is returned, for non-index items the minimum and maximum are returned. Items with varying array shape will not be returned by this function (i.e. you may need to preselect the MS passed to MSRange). See the enum description in MSSelector for the list of supported items. Use the data flags if useFlags is True. Correct for one-based indexing if oneBased is True.

Record casacore::MSRange::range	(	const Vector< Int > &	items,
		Bool	useFlags = `True`,
		Bool	OneBased = `False`
	)

Same as previous function, with Vector of MSS::Field keys instead of Strings.

Record casacore::MSRange::range	(	MSS::Field	item,
		Bool	useFlags = `True`
	)

Similar to above, with a single enum, for convenience.

void casacore::MSRange::scalarRange	(	Record &	out,
		const String &	item,
		const ScalarColumn< Int > &	id,
		Bool	oneBased
	)

protected

get the range of a ScalarColumn<Int>, correct for 1-based indexing if oneBased is True, and add to out record.

Vector<Int> casacore::MSRange::scalarRange ( const ScalarColumn< Int > & id )

protected

get the range of a ScalarColumn<Int>

void casacore::MSRange::setBlockSize ( Int blockSize = 10 )

Set the block size (in Mbytes) to use when reading the data column.

The default is 10 MB. Actual memory used is higher due to temporaries and caching.

Member Data Documentation

Int casacore::MSRange::blockSize_p

private

Definition at line 209 of file MSRange.h.

Bool casacore::MSRange::constantShape_p

private

Definition at line 213 of file MSRange.h.

Vector<Int> casacore::MSRange::ddId_p

private

Definition at line 210 of file MSRange.h.

MeasurementSet casacore::MSRange::ms_p

private

Definition at line 208 of file MSRange.h.

Vector<uInt> casacore::MSRange::polId_p

private

Definition at line 212 of file MSRange.h.

const MSSelector* casacore::MSRange::sel_p

private

Definition at line 214 of file MSRange.h.

Vector<uInt> casacore::MSRange::spwId_p

private

Definition at line 211 of file MSRange.h.

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

casa/casacore/ms/MeasurementSets/MSRange.h

Public Types

Public Member Functions

Protected Member Functions

Private Types

Private Attributes

Detailed Description

Intended use:

Review Status

Prerequisite

Etymology

Synopsis

Example

Motivation

Thrown Exceptions

To Do

Member Enumeration Documentation

Constructor & Destructor Documentation

Member Function Documentation

Member Data Documentation