[daip] UVCOP error

[Eric Greisen]

Christopher Hales wrote:
> Dear Eric,
> 
> When I run UVCOP I encounter the following error in the message server:
> 
> echidn> UVCOP1: Task UVCOP  (release of 31DEC13) begins
> echidn> UVCOP1: Create 10-25F      .UVEVLA.   1 (UV)  on disk  1  cno    2
> echidn> UVCOP1: Applying flag table version   1 to the data
> echidn> UVCOP1: ZDAOPN: DELAY 1
> echidn> UVCOP1: ZDAOPN: DELAY 2
> echidn> UVCOP1: UVINIT: LREC, NPIO =   3079      0 ILLEGAL
> echidn> UVCOP1: UVINIT: OR NVIS, BUFSZ, OR BO =         02390016      1 
> ILLEGAL
> echidn> UVCOP1: COPYUV: ERROR   2 INITING OUTPUT VIS FILE
> echidn> UVCOP1: Destroyed  1 extension files of type FQ
> echidn> UVCOP1: Destroyed UV image file: catno=      2 disk= 1
> echidn> UVCOP1: Purports to die of UNNATURAL causes
> echidn> UVCOP1: echidna      31DEC13 TST: Cpu=       0.0  Real=       2
> 
> 
> It seems to be having trouble forming a new vis file. I'm not an AIPS 
> pro, so I'm having trouble tracking down the cause of this error.
> 
> Could you please advise?

The message appears to be saying that there are no visibilities 
selected.  Since your UVCOP only contains 2 interesting adverbs (FLAGVER 
and UVCOPP(3)=1) this suggests that there are no visibilities in the 
input data set.  Have you looked at IMHEADER, LISTR (OPTYPE='SCAN'), 
PRTUV, etc. to make sure that you have actually read in data?

The BDF2AIPS error may have been fatal.  Did you do BDFLIST and what 
adverbs did you select in BDF2AIPS?

Eric Greisen


> 
> For reference, I have listed my entries to UVCOP below. I also show 
> output from PCAT.
> 
> For broader context, I am using BDF2AIPS to import an SDM-BDF (VLA 
> data). I then want to apply the online flags using UVCOP, then write out 
> a uvfits file using FITAB. I will then import into CASA using 
> importuvfits. The reason for my AIPS detour (rather than using CASA's 
> importevla) is because my SDM-BDF has 15 spw's with 2048 channels and 4 
> spw's with 64 channels. I only need access to the latter, and on a fast 
> timescale. Not sure if it's worth mentioning, but I note that the 
> BDF2AIPS log file contains the following error:
> BDFIn: Error   20131119T071525 GetData: Frequencies inconsistent 
> 1015000000.000000 != 1768000000.000000, IF 1
> BDFIn: Error   20131119T071525  Occured at file BDFIn.c: line 2095 
> (GetData)
> 
> Thank you.
> 
> Chris
> 
> 
> 
> 
>> inp
> AIPS 1: UVCOP     Task to copy selected times and channels of uv data.
> AIPS 1: Adverbs     Values                 Comments
> AIPS 1: ----------------------------------------------------------------
> AIPS 1: INNAME     '10-25'                 Input UV file name (name)
> AIPS 1: INCLASS    'UVEVLA'                Input UV file name (class)
> AIPS 1: INSEQ         1                    Input UV file name (seq. #)
> AIPS 1: INDISK        1                    Input UV file disk unit #
> AIPS 1: OUTNAME    '10-25F'                Output UV file name (name)
> AIPS 1: OUTCLASS   'UVEVLA'                Output UV file name (class)
> AIPS 1: OUTSEQ        0                    Output UV file name (seq. #)
> AIPS 1: OUTDISK       1                    Output UV file disk unit #.
> AIPS 1: SELBAND      -1                    Bandwidth to select (kHz)
> AIPS 1: SELFREQ      -1                    Frequency to select (MHz)
> AIPS 1: FREQID       -1                    Freq. ID to select. 0=> all
> AIPS 1: BCHAN         1                    First channel selected.
> AIPS 1: ECHAN         0                    Last channel selected.
> AIPS 1: BIF           0                    Lowest IF number 0=>all
> AIPS 1: EIF           0                    Highest IF number 0=>all
> AIPS 1: SOURCES    *all ' '                Source list
> AIPS 1: QUAL         -1                    Source qualifier -1=>all
> AIPS 1: UVRANGE       0           0        Annulus in uv plane selected
> AIPS 1:                                     (thousands of wavelengths)
> AIPS 1: TIMERANG   *all 0                  Timerange:
> AIPS 1:                                     1-4 = start day,hr,min,sec
> AIPS 1: ** press RETURN for more, enter Q or next line to quit print **
> #
> AIPS 1:                                     5-8 = end   day,hr,min,sec
> AIPS 1: ANTENNAS   *all 0                  Antennas to copy 0=>all
> AIPS 1: BASELINE   *all 0                  Baselines with ANTENNAS
> AIPS 1: SUBARRAY      0                    Limit copy to one subarray
> AIPS 1:                                    0 => all.
> AIPS 1: FLAGVER       1                    FG table to apply to data
> AIPS 1:                                    <= 0 => do not apply
> AIPS 1: UVCOPPRM      0           0        Flags:
> AIPS 1:               1        *rest 0      1 > 0 => keep flagged data
> AIPS 1:                                     2 > 0 => drop subarray info
> AIPS 1:                                     3 = 0 => copy xc and ac data
> AIPS 1:                                       = 1 => copy only xc data
> AIPS 1:                                       = 2 => copy only ac data
> AIPS 1:                                          of antennas, named in
> AIPS 1:                                          antenna list. Baseline
> AIPS 1:                                          list must be zero.
> AIPS 1:                                     4 > 0 => report progress
> AIPS 1:                                     5 => flag data with weights
> AIPS 1:                                          below this limit
> AIPS 1:                                     6 = 1,3 -> do NOT flag TY/SY
> AIPS 1:                                       = 2,3 -> do NOT flag SN
> AIPS 1:                                     7 = extend copy of tables
> AIPS 1:                                         by UVCO(7) min, 0 -> 15
> AIPS 1: NCOUNT        0                    If UVCOPPRM(3) = 2 then
> AIPS 1: ** press RETURN for more, enter Q or next line to quit print **
> #
> AIPS 1:                                    NCOUNT is the approximate
> AIPS 1:                                    ratio of AC to XC in file.
>> go
> AIPS 1: Resumes
> AIPS 1: RETURN CODE      2 RECEIVED: STOPPING
>> pcat
> AIPS 1: Catalog on disk  1
> AIPS 1:  Cat Usid Mapname      Class   Seq  Pt     Last access      Stat
> AIPS 1:    1  999 10-25       .UVEVLA.    1 UV 19-NOV-2013 08:32:28