[daip] [Fwd: DBCON question]

[Hanno Spreeuw]

Hello, there is an easy solution for this.
For concatenating with the second epoch, reverse the order:
getn first channel of second epoch
get2n total of first epoch
doarr -1
output XYZ

next

getn XYZ
get2n second channel of second epoch
doarr 1
output ABC

next

getn ABC
get2n third channel of second epoch
doarr 1
etc.

Cheers,
Hanno.
-------- Original Message --------
Subject: DBCON question
Date: Fri, 04 Apr 2008 17:26:01 +0200
From: Hanno Spreeuw <hspreeuw at science.uva.nl>
Organization: Universiteit van Amsterdam
To: daip at nrao.edu

Hello, I would like to ask a question about DBCON.
Suppose you have two datasets from different epochs (and different VLA
configurations) at almost the same frequency.
I split the separate channels from both datasets using uvcop and glue
all of them together into one dataset using dbcon.
It works, without error.
I can concatenate all of the first epoch using doarr 1.
When I want to concatenate with the first channel of the data from the
second epoch, I use doarr -1.
But what if I concatenate this with the second and next channels of the
data from the second epoch?
I could continue setting doarr -1, but that would make an unnecessary
extra number of AN files and subarrays, also these second and next
channels from the second epoch would be separated from the first channel
of the second epoch  by multiples of 5 days.
Is there a workaround?
If I set doarr +1 when concatenating with the second and next channels
of the second epoch it doesn't work because all that data is adversely
assigned to subarray 1 of the first epoch which gives bogus data.

Can you help?
Thanks,
Hanno.