[daip] CVEL Problem

[Eric Greisen]

Lisa May Walker wrote:
> To Whom it May Concern,
> 
> Hello, I have been working with some VLA HI data using the 31Dec10 
> version of AIPS taken over the course of a week in June 2009. After 
> calibrating the data, I ran SETJY to set the source velocity, then SPLIT 
> to create single-source files. I then tried to run CVEL on one of the 
> single-source files. For some of the days, it quickly ran through 
> antennas 1-26 on the first scan, then stalled. For other days, it 
> successfully got through the entire dataset. During the time when CVEL 
> hangs, my computer isn't swapping, but I'm using ~50% of the processor. 
> I've put the inputs and outputs for days 1 and 2, as well as the data, 
> at http://www.astro.virginia.edu/~lmw7k/CVELProblem/. Day 1 is the data 
> that CVEL couldn't get through, day 2 is the data it had no problem with.
>
Many thanks for your concise and helpful description of the problem.  I 
used your data and uncovered the infinite loop cause and a more serious 
error.  I attach the announcement about the matter.

I wish more users were as helpful as you.

Thanks,

Eric Greisen
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