[evlatests] setting reference antennas

[Claire Chandler]

On Tue, 22 Jul 2008, Bryan Butler wrote:

>
>
> Ken Sowinski wrote:
>> On Tue, 22 Jul 2008, Bryan Butler wrote:
>>>
>>> Ken Sowinski wrote:
>>>>
>>>> You lose the pointing and phasing history.
>>>
>>> could you elaborate on this?  what do you mean?
>>
>> My understanding is that pointing and phase results do not persist
>> between scripts.  If a script is interrupted after a pointing or
>> phasing scan and then restarted the information learned is now lost.
>
> phasing i understand, though i think the use cases for this are few and
> far between.  pointing, hm.  probably only a concern for global pointing
> model runs?

Does this mean that if there has been a reference pointing and the script 
is interrupted, there are no good pointing solutions applied until a new 
reference pointing scan is done?  This would affect all high frequency 
programs, not just global pointing model runs.

Claire

>>>> It is clumsy for files in durations.
>>>
>>> how so?  seems to me the mechanism is exactly the same for durations
>>> or stop times.
>>
>> A duration file, if started over, begins at the beginning not where
>> it left off.  That addresses my first concern, but means more time
>> than was expected is used for the observation.
>
> sure, but i'd guess that 99% of durations files are used during testing
> anyway, so this doesn't strike me as much of an issue.
>
>>
>>>> Someone has to edit a file with the chance of making mistakes.
>>>
>>> indeed, but we have this vulnerability however we choose to do it,
>>> throughout the system.
>>
>> Clicking on a button to select a reference antenna may not be
>> as prone to error as editing a file.
>
> assuming rich exposes this in the array operater's interface or something?
>
> seems to me this stretches across so many different programs that the
> benefits aren't worth the development cost.
>
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