[daip] Problem with CVEL ?

[Eric Greisen]

Nissim Kanekar wrote:
> 
> Hi Eric,
> 
> I'm having some strange problems with a file created by CVEL: later 
> programs (POSSM, UVPLT, IMAGR) all die with the error
> 
>> UVPLT1: Task UVPLT  (release of 31DEC08) begins
>> UVPLT1: Doing no flagging this time
>> UVPLT1: ZMI2: REQUEST FOR BYTES 929910785 THRU = 930109884 BEYOND EOF =
>>         930085888
>> UVPLT1: ZMIO: OPER=READ LUN=25 BLKNO=      908117 8-BIT-BYTES=199100
>> UVPLT1: ZERROR: IN ZMI2 ERRNO = 22 (Invalid argument)
>> UVPLT1: ZWAIT: ZWAI2 RETURNS ERROR 3 FOR LUN = 25 BUFFER = 2
>> UVPLT1: ZERROR: IN ZWAI2  ERRNO = 22 (Invalid argument)
>> UVPLT1: DATGET: ERROR  3 READING UV DATA
>> UVPLT1: SCAL: ERROR  3 READING VIS FILE
>> UVPLT1: Purports to die of UNNATURAL causes
>> UVPLT1: socrates 31DEC08 TST: Cpu=      0.7  Real=      1  IO= 889
> 
> 
> The problem is definitely to do with the CVEL file, because the UVSUB 
> file on which I'm running CVEL, doesn't show these problems. The 
> puzzling thing is that I've tried running CVEL with exactly the same 
> inputs on other data sets, without having any problems with the .CVEL 
> files. Also, CVEL itself doesn't give an error. Was wondering if you 
> might know what's going on...
> 
> Thanks,
> Nissim
I suspect that the count of visibilities in the header is wrong. 
Otherwise the cal routines used by UVPLT would not go slightly past the 
EOF.  How that could happen is not at all obvious to me.

Eric Greisen