[daip] Re: CVEL

[Eric Greisen]

Jiyune Yi writes:
 > > #Hi,
 > > #
 > > #I'm wondering there is any accasion that CVEL doesn't
 > > #print message although aparm (8) sets to zero.
 > > #
 > >
 > > I think the problem is that you are working with a single source file and
 > > all aparms are set to zero. For single source this means no shift (which is
 > > supposed to be defined in aparm 1-6) so probably no shift means no messages
 > 
 > Hi Lorant,
 > 
 > No, that's not the case, it's a multi-sources file.
 > I should have not mentioned about aparm specifically,
 > it seems biasing my question.
 > 
 > We could find a small amount (not looking odd) of line
 > shift between input and output of CVEL with POSSM yesterday
 > but nothing else better way to make sure CVEL went correctly
 > so far. Any good idea to test this ?
 > 
 > CVEL did shift but somehow didn't report on the AIPS_MSGSRV.

CVEL only reports "excess" shifts - of more than 10% of the total
bandwidth.  Most of our programs run silently when they are working
correctly.  If the lines shifted by a little, then the program worked.
Tasks like UVDIF and PRTUV for uv data and COMB and PRTIM for images
are ways top reassure yourself that the expected was actually done.

Eric Greisen