[daip] [!5094]: aips - WTMOD sometimes writes out u,v,w == 0

[Michael Bietenholz]

Michael Bietenholz updated #5094
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              Status: Open (was: Closed)

WTMOD sometimes writes out u,v,w == 0
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           Ticket ID: 5094
                 URL: https://help.nrao.edu/staff/index.php?/Tickets/Ticket/View/5094
           Full Name: Michael Bietenholz
               Email: mbieten at yorku.ca
             Creator: User
          Department: AIPS Data Processing
       Staff (Owner): Eric Greisen
                Type: Issue
              Status: Open
            Priority: Default
      Template Group: Default
             Created: 30 June 2014 05:26 PM
             Updated: 30 June 2014 08:14 PM



As you have figured out, all the uvw's are affected.  Also as you say, running with FQCENTER=1 seems to fix the problem.  However, for the VLBI data set, setting FQCENTER produces an "missing SU table" error for the LBA data set  although it makes a reasonable-seeming output file.  I think the "missing SU-table error happens when there are multiple IFs in the input file, I didn't get it when I tried a version of the same file which had all the IFs averaged.

localh> WTMOD1: Task WTMOD  (release of 31DEC14) begins
localh> WTMOD1: Create J1424 CL8WTM.CL8WTM.   2 (UV)  on disk  1  cno  789
localh> WTMOD1: Min. Abs(wt) = 2.50000E-01 Max. wt. = 1.00000E+00
localh> WTMOD1: Copied FQ file from vol/cno/vers  1  784   1 to  1  789   1
localh> WTMOD1: Copied XX file from vol/cno/vers  1  784   1 to  1  789   1
localh> WTMOD1: Copied XX file from vol/cno/vers  1  784   2 to  1  789   2
localh> WTMOD1: Copied AN file from vol/cno/vers  1  784   1 to  1  789   1
localh> WTMOD1: TABINI: REQUESTED SU FILE   1 DOES NOT EXIST
localh> WTMOD1: SOUINI: ERROR   2 FROM TABINI OPCODE = READ
localh> WTMOD1: SUINI: ERROR INITIALIZING SOURCE TABLE FOR READ
localh> WTMOD1: CENTSU ERROR:    2 ON OPENING INPUT SU TABLE
localh> WTMOD1: WTMDHI: ERROR CORRECTING FQ TABLE
localh> WTMOD1: Appears to have ended successfully
localh> WTMOD1: dailyali 31DEC14 TST: Cpu=      0.1  Real=      0  IO=       124

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