Difference between revisions of "Clearcal"

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== Help for clearcal:==
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{{clearcal}}
 
 
<pre>
 
Help on clearcal task:
 
 
 
Re-initializes the calibration for a visibility data set
 
 
 
      Clearcal reinitializes the calibration columns in a measurement set.
 
      Specificially, it will set the MODEL_DATA column to unity in total intensity
 
      and zero in polarization, and it will set the  CORRECTED_DATA column to the original
 
      (observed) DATA in the DATA column.  Use the field and spw parameters to select
 
      which data to initialize.  If the dataset does not yet have the scratch
 
      columns, they will be created and initilized for the whole dataset (field and spw
 
      ill be ignored). 
 
 
 
      Keyword arguments:
 
      vis -- Name of input visibility file
 
              default: none; example: vis='ngc5921.ms'
 
 
 
      field -- Select field using field id(s) or field name(s).
 
                [run listobs to obtain the list id's or names]
 
              default: ''=all fields
 
              If field string is a non-negative integer, it is assumed a field index
 
                otherwise, it is assumed a field name
 
              field='0~2'; field ids 0,1,2
 
              field='0,4,5~7'; field ids 0,4,5,6,7
 
              field='3C286,3C295'; field named 3C286 adn 3C295
 
              field = '3,4C*'; field id 3, all names starting with 4C
 
      spw -- Select spectral window
 
              default: ''=all spectral windows and channels
 
              spw='0~2,4'; spectral windows 0,1,2,4 (all channels)
 
              spw='<2';  spectral windows less than 2 (i.e. 0,1)
 
              spw='0:5~61'; spw 0, channels 5 to 61
 
              spw='0,10,3:3~45'; spw 0,10 all channels, spw 3, channels 3 to 45.
 
              spw='0~2:2:6'; spw 0,1,2 with channels 2 through 6 in each.
 
              NB: Multiple channel ranges per spw are not supported in clearcal.
 
 
 
</pre>
 

Latest revision as of 19:22, 6 May 2015