[daip] AIPS IMAGR problem

[Eric Greisen]

N. Iniyan wrote:
> Dear Greisen,
> 
> My name is Iniyan. I am a Research Trainee working at the Indian 
> Institute of Astrophysics. I have been working on HI line data with AIPS 
> for the past few months. While trying to image the output file of UVSUB, 
> I get the following error in the message server.
> 
> LOCALH> IMAGR1: Task IMAGR  (release of 31DEC10) begins
> LOCALH> IMAGR1: Doing no flagging this time
> LOCALH> IMAGR1: Create M104A       .IMAGR .   1 (UV)  on disk  1  cno   31
> LOCALH> IMAGR1: Beginning channel    1 through    1 with  1 IFs
> LOCALH> IMAGR1: IMACPY: Copied   100653 visibilities to be imaged
> LOCALH> IMAGR1: QINIT: did a GET  of      5120 Kwords, OFF       -355247333
> LOCALH> IMAGR1: UVWAIT: begin finding uniform weights
> LOCALH> IMAGR1: UVWAIT: Average grid weight  4.119E+02
> LOCALH> IMAGR1: UVWAIT: Adding temperance S  8.238E+01
> LOCALH> IMAGR1: UVWAIT: begin applying uniform or other weights
> LOCALH> IMAGR1: UVWAIT: Sum of weights in  8.923E+05 and out  8.990E+05
> LOCALH> IMAGR1: UVWAIT: Noise is increased by a factor 1.361 due to 
> weighting
> LOCALH> IMAGR1: UVWAIT: Average summed weight  4.119E+02 over     100653 vis
> LOCALH> IMAGR1: CLNOPN: ERROR OPENING CLEAN process object
> LOCALH> IMAGR1: Destroyed  1 extension files of type AN
> LOCALH> IMAGR1: Destroyed  1 extension files of type FQ
> LOCALH> IMAGR1: Destroyed UV image file: catno=     31 disk= 1
> LOCALH> IMAGR1: Purports to die of UNNATURAL causes
> LOCALH> IMAGR1: localhos 31DEC10 TST: Cpu=      0.3  Real=      1  IO=   
>     249
> 
> I have tried what you have suggested in this link 
> <http://listmgr.cv.nrao.edu/pipermail/daip/2008-July/013158.html>. But I 
> couldn't find any *.1ZP files in my data area. I would appreciate it if 
> you could give me your suggestions about how to proceed with this.

The 1ZP in the referenced message is that user's number in extended 
hexadecimal (2581 in decimal).  If the error that affected him were to 
affect you - and the error messages are very different - then the files 
you would look for would have the extension .uuu\; where uuu is your 
user number in extended hex.

Unfortunately this error message says very little - have you specified 
an existing image as your output file?  Is OUTSEQ not 0?  If so, does 
the image your are trying to write match the existing image in all 
details (x-y size, number of spectral channels, channel incremenet etc etc)?

Eric Greisen