[daip] questions about rflag and flag tables

[Susan Neff]

Hi there,

I'm pretty recent with AIPS versions - I ran a MNJ on 
July 11
(the morning I left there on last trip), and I've 
ported that
to my MacPro.  I eventually got RFLAG to work the way
Amy suggested, i.e. just keep writing new flag tables 
each
time and iterating down the noise values.

[The reason I was running it this way was to set 
different noise
and scut values for different sources with widely 
varying fluxes.]

If I get a chance I'll try to go back and see what 
happens with
appending flags to an existing flag table, paying 
attention to
things like number of visibilities and number merged 
and so on.


Thanks,
-s-



On 7/20/12 1:42 PM, Frazer Owen wrote:
>       Susan,
>
>       How old a version of AIPS are you using ? Have you run the latest
> midnight job ?
>
>       I believe I remember something in the last few weeks that Eric did
> to RFLAG to improve the flag handling for multiple sources. In any case,
> when talking with Eric, I would make sure I had the lastest version.
>
> ---Frazer
>
> On 7/20/12 11:34 AM, Amy Mioduszewski wrote:
>> Hi Susan,
>>
>> Eris is away on a brief vacation (back on Monday), lets see if I can
>> answer your questions.  Here is how FLAGVER and OUTFGVER are supposed
>> to work:
>> 1-flagver=xx and outfgver=0 will mean that xx is applied to the data
>> and copied to table yy and new flags are appended to yy.
>> 2-flagver=xx and outfgver=yy then the new flags are appended to yy but
>> nothing is copied from xx.  This should do what you want because all
>> the flags from xx have already been copied to yy in #1.  (The question
>> is why do it this way since xx has already been copied to yy, my only
>> thought is that you don't want an infinite number of FG tables?  What
>> I would do just because it is simpler is the first time I ran RFLAG I
>> would set flagver=xx and after than just set flagver=0 and outfgver=0,
>> this would just keep copying flavger to outfgver and appending more
>> flags every time RFLAG is run.)
>>
>> Anyway, you should not have to create a new flag table to get the new
>> flags. However I am looking at the documentation for OUTFGVER rather
>> than what is actually done in RFLAG.
>>
>> To prove that it is not appending the new flags, do a PRTAB on the FG
>> table and see if you are missing the flags for the second source.  I
>> assume RFLAG has some sort of RFLAG reason (i.e., the REASON in the FG
>> table will start with "RFLAG") so you should be able to tell where the
>> flags in the FG table come from.
>>
>> Amy
>>
>> Susan Neff wrote:
>>> Hi Eric,
>>>
>>> I have a question about RFLAG and flag tables.
>>>
>>> What I am doing is as follows:
>>> The first time I run RFLAG, I give it
>>> flagver = xx, outfgver = 0,
>>> so it will create a new flag table by
>>> copying flagver xx and then adding to it.
>>> I run rflag on a subset of sources,
>>> creating new flag table yy.
>>> Then I try running rflag again on
>>> different sources, using flagver = xx
>>> and outfgver = yy.
>>>
>>> What happens to the flags created in the
>>> run on the second source??
>>>
>>> I'm asking because it seems that the flags
>>> produced for the second source are not making
>>> it into the flag table.  The output plots
>>> I get by running with doplot = -12 look
>>> like it got the flags, and the noise
>>> and scut returned adverbs look like
>>> they got the flags.  However, if I try to
>>> run another round of rflag, on the second
>>> source, using flagtable yy,  I get
>>> the same starting noise and scut values
>>> as I had in the first run on the second
>>> source... not lower values as I would expect.
>>> (A second run on the first source behaves
>>> as I expect - i.e. the second run returns
>>> much lower values for noise(i) and scut(i).
>>>
>>> I'm wondering if the flags for the
>>> second sources are not
>>> actually making it into the output
>>> flag table ( if it is specified, as opposed
>>> to being set to zero and therefore
>>> creating a new table).  I had
>>> thought they would be added into
>>> the flag table created with the first source, but
>>> now I'm wondering if I have misinterpreted
>>> what is happening.
>>>
>>> Do I always need to create a new flag
>>> table to capture the the newly created
>>> flags?  And if I create a new flag table,
>>> using only some of the sources, does
>>> it carry along the flags for all sources?
>>>
>>> Thanks for any insight you can provide,
>>> -s-
>>>
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