sditerator - Constructor

An sditerator from an existing file on disk.

Synopsis
sditerator(filename, readonly, selection, lockoptions, correcteddata)

Description
This constructor is used to open an already existing single dish data set. The type of data set (flat-table or MeasurementSet) is automatically determined. MeasurementSets can only be opened read-only. The lockoptions are the same as those appropriate for the table tool . The selection record follows the same structure as that used by the select function. The CORRECTED_DATA column is only available for MeasurementSet-based sditerators. When CORRECTED_DATA is requested, the type of the arr field in the sdrecord will be complex.

Arguments

filename	in	Name of SDFITS file on disk
		Allowed:	String
readonly	in	Open Read-only?
		Allowed:	Bool
		Default:	T
selection	in	Record describing any selections to do on opening
		Allowed:	Glish record
		Default:	[=]
lockoptions	in	locking to be used
		Allowed:	String
		Default:	auto
correcteddata	in	Use the CORRECTED_DATA column?
		Allowed:	Bool
		Default:	F

Returns
sditerator tool

Example

  sdit := sditerator("a302_SP",correcteddata=T);
  r := sdit.get();

The first line opens an existing data set, using the CORRECTED_DATA column to supply the values for the arr field in the returned sdrecord. The second line fetches the first sdrecord found in that sditerator. The type of r.data.arr is complex.

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	Package	dish
	Module	dish
	Tool	sditerator