[evla-sw-discuss] Reference pointing

[Barry Clark]

I made a small change to the include file pointing.py to facilitate
usage of the feature of using previous pointing solutions if the
current one fails.  I have added an optional parameter.

Current reference pointing has a call like

refpt = vlaPointing(tmjd( 8, 30, 20, 0), tmjd( 8, 42,  0, 0), 10.000000, 
2, [])

which will still work as before.

To use the "use last solution" feature, somewhere near the beginning of
the script, put

refpt = None

then the calls to vlaPointing become something like

refpt = vlaPointing(tmjd( 8, 30, 20, 0), tmjd( 8, 42,  0, 0), 10.000000, 
2, [], refpt)


While I was mucking with the file, I put in a second modification, again
an optional parameter, for use with multiple, software controlled,
subarrays.

After one creates another Subarray, say subarray2, and moves antennas
into it from the default subarray, one can do pointing in subarray2
with a call

refpt = vlaPointing(tmjd( 8, 30, 20, 0), tmjd( 8, 42,  0, 0), 10.000000, 
2, [],,subarray2)

This is a particularly unsatisfactory, though easy, implementation,
because while a pointing scan is running in one subarray, the others
cannot change sources.