testconcat Namespace Reference

Functions
def	testconcat

---

Function Documentation

def testconcat.testconcat	(		vis = [''],
			testconcatvis = '',
			freqtol = '',
			dirtol = '',
			copypointing = True
	)

Concatenate the subtables of several visibility data sets, not the MAIN bulk data.

The list of data sets given in the vis argument are concatenated into an output
data set in testconcatvis without the bulk data of the MAIN table.  
This is useful for obtaining the information in the merged subtables without
actually performing a time-consuming concatenation of the MAIN tables on disk.


Keyword arguments:
vis -- Name of input visibility files for which the subtables are to be combined
default: none; example: vis = 'mydata.ms',
     vis=['src2.ms','ngc5921.ms','ngc315.ms']
testconcatvis -- Name of MS that will contain the concatenated subtables
default: none; example: testconcatvis='test.ms'

freqtol -- Frequency shift tolerance for considering data to be in the same
   spwid.  The number of channels must also be the same.
default: ''  do not combine unless frequencies are equal
example: freqtol='10MHz' will not combine spwid unless they are
   within 10 MHz.
Note: This option is useful to conbine spectral windows with very slight
   frequency differences caused by Doppler tracking, for example.

dirtol -- Direction shift tolerance for considering data as the same field
default: '' means always combine.
example: dirtol='1.arcsec' will not combine data for a field unless
   their phase center differ by less than 1 arcsec.  If the field names
   are different in the input data sets, the name in the output data
   set will be the first relevant data set in the list.

copypointing -- Make a proper copy of the POINTING subtable (can be time consuming).
        If False, the result is an empty POINTING table.
 default: True

Definition at line 13 of file testconcat.py.

References task_testconcat.testconcat(), and vla_uvfits_line_sf.verify.