[daip] [Fwd: DBCON question]

[Eric Greisen]

Hanno Spreeuw wrote:
> 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.
>

More simply - concatenate all of the 1st epoch together, concatenate all 
of the second epoch together, and then finally concatenate the two 
concatenations together.

Eric Greisen