Basic Information on mbanal

Task: mbanal
Purpose: Analyse multibeam data
Categories: uv-analysis

MBANAL is a task to manipulate sets of visibility spectra.
One or two spectra sets are read from a visibility dataset,
and then these spectra sets can be manipulated interactively
with a set of simple commands. These commands manipulate
"spectra sets" or individual baselines. A spectra set is 
the collection of baselines that are in some way similar.
For example, the set
of baselines of a particular source observed during some
particular time interval would be an example of a spectra set.
new spectra sets (or overwrite old ones). Alternately a
spectra set could be an observation of a reference blank
piece of sky. 

Commands include:
  Command    Args
  -------    ----
  load       var  select
  save       var  dataset
  add        out  in1 in2
  subtract   out  in1 in2
  multliply  out  in1 in2
  divide     out  in1 in2
  conjugate  out  [in]
  sqrt       out  [in]
  plot       in   [amp|phase|real|imag] [PGPLOT device]
  exit

Commands can take either spectra sets of the spectra
of an individual baseline. An individual baseline is
given in the form:
  name[m,n]
where 'name' is the name of the spectra set and m and n
are indices of the elements involved. For example
  ref[1,13]
is the spectra of beams 1 correlated with 13 of the
'ref' spectra set.

For example
  mbanal vis=multi.uv ref=time(10:00,10:10)
will start mbanal, and define the visibility set
'ref'. Subsequent interactive commands could be:

  plot ref amp
will plots the amplitude of the ref datasets.

  plot ref[1,13] phase
will plot the phase of baseline 1-13 of ref.

  add sum ref src
will add the ref and src spectra sets, and produce a
new spectra set called 'sum'.

Key: vis
Name of the input visibility dataset. No default.

Key: line
Standard line-type specification. See the help on line
for more information.

Key: script
Text file of commands to execute. The default is to
interactively prompt at the terminal.

Key: device
Plotting device. Default is /xs. The plotting device can
be overridden on the MBANAL prompt.