Renaming a Field

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Revision as of 19:40, 10 February 2010 by Lchomiuk (talk | contribs) (Created page with 'Sometimes sources are named the "wrong" thing in the original data set, and it would be nice to change the field name. Such as in this case I just encountered: The flux calibra…')

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Sometimes sources are named the "wrong" thing in the original data set, and it would be nice to change the field name. Such as in this case I just encountered:


The flux calibrator in some data was named "J1331+3030'. Setjy only recognizes three names for this source ('3C286', '1328+307', and '1331+305')---none of which match the name given in the dataset. So, if you try to run setjy on this source, you'll see that the flux density is set to 1 Jy, which is incorrect.

2010-02-10 23:35:30 INFO setjy	##########################################
2010-02-10 23:35:30 INFO setjy	##### Begin Task: setjy              #####
2010-02-10 23:35:30 INFO  	setjy::::casa
2010-02-10 23:35:30 INFO setjy	  J1331+3030  spwid=  0  [I=1, Q=0, U=0, V=0] Jy, (default)
2010-02-10 23:35:30 INFO setjy	Selecting data
2010-02-10 23:35:30 INFO setjy	Selected 4818 out of 70290 visibilities.
2010-02-10 23:35:30 INFO setjy	Fourier transforming: replacing MODEL_DATA column
2010-02-10 23:35:30 INFO setjy	Processing after subtracting componentlist /export/home/rso-lchomiuk/test/Leo/leotest.ms.J1331+3030.spw0.tempcl
2010-02-10 23:35:30 INFO setjy	Performing interferometric gridding with convolution function SF
2010-02-10 23:35:31 INFO  	setjy::::casa
2010-02-10 23:35:31 INFO setjy	##### End Task: setjy                #####
2010-02-10 23:35:31 INFO setjy	##########################################

In order for setjy to work properly, we need to change the name of our flux calibrator. We can do this in two ways, the first using table tools:

tb.open('leotest.ms/FIELD',nomodify=False)
st=tb.selectrows(4)
st.putcol('NAME','1331+305')
st.done()
tb.close()