[Difx-users] dumpkurtosis parameter? {External}

[Adam Deller]

Hi Mike,

That hasn't been used for, I'm guessing, around 15 years. If I remember
correctly, if switched on then the kurtosis is calculated in mode,
accumulated in core, and is then sent out as a BINARY_STA difxmessage (in
the same way the short term autocorrelation visibilities were sent out for
the V-FASTR project to search for fast transients. STA stands for Short
Term Accumulate). I don't *think* that there was ever any infrastructure
built to capture those kurtosis arrays and make use of them. (The intent
was to ultimately use kurtosis in a calculation to decide to blank certain
time windows or replace them with gaussian noise within DiFX itself, so the
binary message send was only ever intended as a way to record kurtosis data
for offline analysis and testing).

So if you wanted to make use of this capability, you'd need to create a
tool that listened for those BINARY_STA messages from DiFX and saved them
to a file. (Or, perhaps easier, you could edit the code in core.cpp to
simply write the results out to a local file, and then gather it all up
after the correlation instead).

Cheers,
Adam

On Tue, 20 May 2025 at 22:06, Michael Dutka via Difx-users <
difx-users at listmgr.nrao.edu> wrote:

> Hi DiFX users,
> Does anyone have any experience with extracting the kurtosis
> information from DiFX? I see there's a parameter called dumpkurtosis in the
> source code, but i'm not sure how to set it or where than information gets
> recorded.
> --
> Michael S. Dutka
>
>
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> Difx-users at listmgr.nrao.edu
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>


-- 
!=============================================================!
Prof. Adam Deller
Centre for Astrophysics & Supercomputing
Swinburne University of Technology
John St, Hawthorn VIC 3122 Australia
phone: +61 3 9214 5307
fax: +61 3 9214 8797
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