[daip] [!12819]: AIPS - FITLD DOWEIGHT seems to affect visibility amplitudes as well as weights

[Eric Greisen]

Eric Greisen updated #12819
---------------------------

       Staff (Owner): Eric Greisen (was: -- Unassigned --)
              Status: Closed (was: Open)
           Reply due: - Cleared - (was: 22 October 2018 11:27 AM)

FITLD DOWEIGHT seems to affect visibility amplitudes as well as weights
-----------------------------------------------------------------------

           Ticket ID: 12819
                 URL: https://help.nrao.edu/staff/index.php?/Tickets/Ticket/View/12819
                Name: Michael Bietenholz
       Email address: mbieten at yorku.ca
             Creator: User
          Department: AIPS Data Reduction
       Staff (Owner): Eric Greisen
                Type: Issue
              Status: Closed
            Priority: Default
      Template group: Default
             Created: 18 October 2018 11:27 AM
             Updated: 18 October 2018 09:32 PM

Yes.  I attempted to make the VLBI weights more meaningfulbut did not understand all the ramifications.  Therefore thevisibilities got divided by the very much larger new weights.I have now fixed it to set the weights only after scaling thevisibilities.  There is still one mystery that I do not understandbut I have sent an e-mail to Walter Brisken for clarification.  Ihave put the correction back so tomorrow's MNJ shouldprovide improved performance (or DOWEIGHT=-1 shouldnow give the old performance).Eric Greisen


------------------------------------------------------
Staff CP:  https://help.nrao.edu/staff
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://listmgr.nrao.edu/pipermail/daip/attachments/20181018/154c531a/attachment.html>