[daip] Are there any adverbs that store the Total Flux Density or N-pixels

[Wasim Raja]

Thanks a lot Eric for your prompt suggestion.
This works fine for me.

regards
--wasim

On Sat, Oct 8, 2011 at 1:09 AM, Eric Greisen <egreisen at nrao.edu> wrote:

> Wasim Raja wrote:
>
>> Dear Eric,
>>  Is there a keyword that stores the following:
>>  1) Total Flux Density
>>  2) Number of pixels used in a current run of IMSTAT
>>
>>  My goal is to use AIPS task "SYSTEM" to output
>>  the total flux density specified by blc and trc in task
>>  IMSTAT. While I am able to grab the values of
>>  the mean flux density using PIXAVG, I am not able
>>  to access the TOTAL FLUX DENSITY or the
>>  NUMBER OF PIXELS used in computing the mean.
>>
>>  I of course can "SEE" the Number of Pixels used, on
>>  the TV SCREEN, but as you must have guessed, I
>>  am dealing with a large number of these images and
>>  hence desire to automate the process.
>>
>
> I am afraid not.  You can compute them and store them in
> local variables in POPS.  The total number of pixels is
> XX = (TRC(1)-BLC(1)+1)*(TRC(2)-BLC(**2)+1)
> The Clean beam area in pixels is rather harder:
> keyword='bmaj'; geth; x = keyv(1)
> keyword='bmin'; geth; x = x*keyv(1)*1.1331
> keyword='cdelt1'; geth; y = keyv(1)
> keyword='cdelt2'; geth; y = y * keyw(1);
> x = x / abs(y)
>
> will make x = number of pixels in a clean beam area
>
> Total flux is then
>
> pixavg * xx / x
>
> xx, x, y are all pops variables known and useful for scratch.
>
>
> Eric Greisen
>



-- 
Research Fellow (A&A)
Raman Research Institute
Bangalore--560080
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