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autoflag.setselect - Function

	Package	synthesis
	Module	autoflag
	Tool	autoflag

Sets up the Selector flagging method

Synopsis
setselect(spwid, field, fq, chan, corr, ant, baseline, timerng, autocorr, timeslot, dtime, clip, flagrange, quack, unflag)

Description

The select method allows you to directly flag or unflag a subset of your data. Subsets can be specified via any combination of field, spectral window, frequency or channel number, correlations (i.e. polarizations), antennas, baselines, time ranges. The method will flag/unflag a whole subset, or, optionally, only autocorrelations, or only specific time slots within the subset. Select also includes the option to flag VLA quacks (specified by scan interval and scan start time).

The spwid, field, fq, chan, corr, ant, baseline, timerng parameters select a subset of the measurement set, on a logical-AND basis.

• An empty array ([]) or a boolean F (which is the default for any parameter), means ``do not select on this''.

• fq specifies ranges of frequencies. You can use strings with units (i.e. "800MHz"), or floats, in which case MHz is assumed.

• chan specifies ranges of channel numbers (1-based). Negative numbers can be used to specify channels starting from the end of the window, e.g., [-10,-1] means the last 10 channels.

• Where ranges are specified, the method expects either a 2N vector:
  [S₁, E₁, S₂, E₂,..., S_N, E_N]

  or a (2,N) array of start/end points.

  For example, if you want to indicate 7 channels (1,2,3,4,5,6,7), either chan = [1,7] or chan = [[1,2],[2,3],...,[6,7]] does the work.

  NOTE: The usual means of indicating a range with the ":" delimiter does not apply for the channel subexpression. For example, the equivalent to [1:3] to select channels 1 through 3 would be [1,3].

• Antennas can be specified by name or 1-based number (which is sometimes the same thing). Names must correspond to the ANTENNA subtable of the measurement set.

• Baselines may be specified either as an array of strings, using antenna names or numbers delimited by ``-'' (e.g. "1-2 4-7", or "RT1-RTA"), or as a (2,N) array of antenna numbers (e.g. [[1, 2],[4, 7]]).

The autocorr, timeslot+dtime, clip, flagrange and quack parameters specify what to flag (or unflag) within the selected subset, on a logical-OR basis. If none are specified, then the entire subset is flagged (or unflagged).