View source for Modifying SOURCE and FIELD tables

Currenly, {{setjy}} will only recognize particular strings as being associated with known calibration sources.  Unfortunately, when the [http://casaguides.nrao.edu/index.php?title=EVLA_3-bit_Tutorial_G192 G192 observation] was set up, the name given to the flux calibrator 3C147 is not recognized by {{setjy}}, so we need to change it in the SOURCE and FIELD tables.

We will rename the flux calibrator to be "3C147" with a capital rather than a lower-case "c".  We can do this with a few [http://casa.nrao.edu/docs/CasaRef/CasaRef.html CASA Toolkit] commands and some Python:
<source lang="python">
# In CASA
tb.open('G192_flagged_6s.ms/SOURCE', nomodify=False)
srcNames = tb.getcol('NAME')
</source>

You can look at the resulting array by typing "srcNames" -- the first 64 entries are '3c147-J0542+49', which we want to modify:
<source lang="python">
# In CASA
for element in range (0,64):
     srcNames[element] = '3C147'

</source>

Now, put the modified values back into the MS table:
<source lang="python">
# In CASA
tb.putcol('NAME', srcNames)
tb.close()
</source>

There's one more place where we need to make this modification -- the "FIELD" table:
<source lang="python">
# In CASA
tb.open('G192_flagged_6s.ms/FIELD', nomodify=False)
fldNames = tb.getcol('NAME')
fldNames[0] = '3C147'
tb.putcol('NAME', fldNames)
tb.close()
</source>

That's it!  Now you can proceed with the [http://casaguides.nrao.edu/index.php?title=EVLA_3-bit_Tutorial_G192 G192 3-bit tutorial].