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.
intent -- Select observing intent
default: '' (no selection by intent)
intent='*BANDPASS*' (selects data labelled with
BANDPASS intent)
addmodel -- add MODEL_DATA along with CORRECTED_DATA if True;
otherwise it will add/reset only CORRECTED_DATA, model visibilities
will then be evaluated when needed.
1.8.0