[daip] Re: aips_gripe

[Eric Greisen]

Shami Chatterjee writes:

 > I have an ongoing gripe with aips flagging that just came up again, so I
 > thought I'd run it past you. Here's the situation:
 > 
 > I'm editing continuum VLBA data (8 IFs, 16 channels per IF, multisource),
 > and I decide that I want to eliminate all points that meet a simple
 > threshold test (eg all points > 10 Jy are RFI; or all points < 0.0001 Jy
 > are bad data). 
 > 
 > I know of no easy way to do this! 
 > 
 > TVFLG will work, but requires me to process each of 8x16 channels
 > separately (excessive labor for something this trivial).  The issue is,
 > using "all chans" / "all IF" mode will flag all IFs when a point meets
 > the test in one IF, not all IFs where the point meets the test. 
 > Likewise for EDITR. And CLIP will not work on multisrc files.
 > 
 > If EDITR or TVFLG simultaneously displayed data for all chans and IFs
 > (instead of all ants for a given IF/chan), this problem would go away.
 > Or if CLIP worked on multisrc files ("CLOP"?) and wrote to the FG table,
 > this would work very well.
 > 
 > 
 > Right now, I'm down too using SPLIT, CLIP, followed by messy TACOP or
 > DBCON work, which is not good especially for phase-referenced data.
 > I realise that the kind of flagging I'm trying to do is not useful and
 > probably dangerous for line data, but it is clearly useful for continuum
 > data. (Or at worst, I should be able to shoot myself in the foot if I
 > want to!)
 > 
 > Let me know if there is a task that addresses this already, or there is
 > some blindingly obvious thing that I'm overlooking so far: I'm sure this
 > has come up before.
 > 

           There is the task CLIPM which is what you want I think.  It
is in 15OCT99 and later.

ERic