[Fwd: Re: [daip] aips]

Amy Mioduszewski amiodusz at nrao.edu
Thu Nov 10 13:39:10 EST 2005


I winn answer this, but we have been going back a forth for a while, so 
perhaps someone else has a better answer than me.

-------- Original Message --------
Subject: Re: [daip] aips
Date: Thu, 10 Nov 2005 16:10:27 +0800
From: zzwu <zzwu at shao.ac.cn>
To: Amy Mioduszewski <amiodusz at nrao.edu>
References: <1127407309.4562.13.camel at wu> <4332EBC4.1070005 at nrao.edu> 
<1127547532.4287.16.camel at wu> <433DCC16.10701 at nrao.edu> 
<019001c5dfaf$dff91100$e61d7fca at zhongzum1bsaxx> <4368F96E.60700 at nrao.edu>

Dear professor Amy Mioduszewski:
       I have send you an email about my solint :
                           solint =4       4853 good solutions  1307 
failed solutions
 
solint=5        4853 good solutions  1307 failed solutions
 
solint=6     3562 good solutions  750failed solutions
 
solint=7    3562 good solutions  750failed solutions
 
solint=8     3562 good solutions  750failed solutions
 
   solint=9  2095 good solutions 313failed solutions
 
solint =10 2095 good solutions 313failed solutions
 
   solint =11  2095 good solutions 313failed solutions
 
   solint =12 2095 good solutions 313failed solutions
and you said that I should choose as short as possible ,and calculate 
the percentage of failed solution(failed soln/good soln),and choose the 
solint based on the lowest percentage of failed solutions),I have tried 
all the solint values ,and applied them to different cl tables and split 
them seperately,but I didn't find nothing different ,from solint 4 5 6 7 
8,the splited data is nearly the same,solint =9 10 11 12  15,the data is 
nearly the same, and if selected solint 4 5 6 7 8,the dada will be
some less than the dada select solint 9 10 11 12 15,I use difmap imaging 
the data,I compared them with the command vplot,and find that,can you 
tell me how can it embody the sensitiviy and how the lower  percentage 
of failed  solutions is good,than you very much.about image the data ,I 
only you difmap,I think you must be familuar with that software,so I 
want ask you that how can I make sure the structure is real,maybe it is 
too gerenal question,but I do not know what is the reason ,I image 
several times ,and modelfit it ,few time of them is the same ,how could 
I be sure about that ,Thank you very much.
       cheers
wu

> Hi Wu,
> 
> I would choose as short as possible, that does not decrease your 
> sensitivity so that you get extra failed solutions.  So what you should 
> do is calculate the percentage of failed solutions (failed soln/good 
> soln), and choose the solint based on the lowest percentage of failed 
> solutions.
> 
> VLBAMPCL was fixed several weeks ago.  If you are on the midnight job 
> you should have the fix.  If you are not you can run it in such a way 
> that the bug will not be triggered (i.e., do not fill the entire 
> ANTENNAS parameter with numbers, type ANTE 5,0 instead of ANTE 5).
> 
> Cheers,
> 
> Amy




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