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calibrater.delmod - Function

2.1.1 Delete model data representations in the MS.


Description

This method can be used to delete the model visibility data representations in the MS. The ’otf’ representation is the new (as of v3.4) ’scratch-less’ model data, stored as keywords in the MS header containing model data formation instructions. It is generated by the im tool (setjy, ft, and clean methods; usescratch=F in im.open), and if present, overrides the old-fashioned MODEL_DATA column (if present). If a user wishes to use the MODEL_DATA column _after_ having operated with the ’otf’ representation, this method can be used to delete the ’otf’ represenatation to make the MODEL_DATA column visible. (Create the MODEL_DATA column by using usescratch=T in the im tool, or by running the cb.open with addmodel=T.)

If otf=T, the user may selectively remove only a selection of fields model from the MS by specifying the field parameter. Similarly if the field parameter is specified, selected spws model for those fields may be deleted by specifying the spw.

For convenience, this method also provides a means for deleting the MODEL_DATA column by setting scr=T.

Arguments





Inputs

otf

If T, delete the otf model data keywords

allowed:

bool

Default:

false

field

Select on field

allowed:

any

Default:

variant

spw

Select on spw only if field is defined

allowed:

any

Default:

variant

scr

If T, delete the MODEL_DATA column

allowed:

bool

Default:

false

Returns
bool

Example

 
 
cb.open(’ngc5921.ms’);  
cb.delmod(otf=T,scr=F);   # delete only the otf model for all fields  
cb.solve();  
 
cb.open(’n4826.ms’)  
cb.delmod(otf=T, field=’1’)  
#delete otf model of field 1 only, all other fields model are untouched  
#if present  
cb.open(’n4826.ms’)  
cb.delmod(otf=T, field=’1’, spw=’2’)  
#delete otf model of field 1 and spectralwindow 2  only.  
 
####NOTE doing:  
cb.delmod(otf=T, field=’’, spw=’2’)  
 
#will delete all otf models and spw will be ignored  
 

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