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<p class="MsoNormal"><span lang="SV" style="mso-fareast-language:EN-US">Hi Adam, all<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="SV" style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:EN-US">Finally some data so I can return to the mixed-pol issue again. To remind you, my problem is that when correlating R-pol (1Gbps) data from ONSALA60 against X/Y-pol (2Gbps) data from
ONSA13NE and ONSA13SW, I must define “zoom bands” to get visibilities on all baselines. Not sure if the problem is in DiFX, or difx2mark4 (or elsewhere). I have uploaded a tar.gz archive with input/output files (excluding 18GB of VDIF data) at<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:EN-US">https://chalmersuniversity.box.com/s/9ed0t61bk04ag88is2ovhlm0er4qd00n<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:EN-US">There you can check logfiles, input files etc. If you want the data, I can share it (no time right now to remember how to split out a small chunk of data for testing, so used one full
30 sec scan). I can also try various things on my end if you have suggestions.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:EN-US">Here are the steps to reproduce with DiFX 2.6.2:<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:EN-US">Unzip archive,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:EN-US">Edit "*.files" with correct paths to "data" directory<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:EN-US">cd zoom<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:EN-US">Edit "on1028_1.machines" accordingly (e.g. computer name)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:EN-US">vex2difx -v -v -v -d *v2d --force (need force as this is mixed circular/linear data)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:EN-US">calcif2 *.calc<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:EN-US">startdifx -n -f *.input -v<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:EN-US">I now get messages, see logfile, like<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:EN-US">"Thu Feb 4 17:56:58 2021 0 skirner WARNING Baseline 0 frequency 0 points at two different frequencies that are apparently identical - this is not wrong, but very strange. Check
the input file"<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:EN-US">The message is correct, I have identical zoom windows - otherwise I don't get all baselines. To see result, I run<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:EN-US">difx2mark4 -v -b X 2300 14000 *.difx -s ../station_code_file.txt<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:EN-US">and check the output on screen. All baselines are included:<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:EN-US">[...]<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:EN-US"> n120[SX] 448<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:EN-US"> n120[ST] 896<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:EN-US"> n120[XT] 448<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:EN-US"> n120[SS] 448<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:EN-US"> n120[XX] 448<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:EN-US"> n120[TT] 448<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:EN-US">[...]<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:EN-US">Same procedure without zoom-windows, I get a different set of baselines<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:EN-US">[...]<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:EN-US"> n120[SX] 448<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:EN-US"> n120[XT] 448<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:EN-US"> n120[SS] 448<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:EN-US"> n120[XX] 224<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:EN-US"> n120[TT] 448<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:EN-US">[...]<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:EN-US">Curiously, the "ST" (which is the ONSA13NE-SW baseline) is missing, and the XX (ONSALA60) is half (224).<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:EN-US">Not sure the zoom-window version is correct, but I need the ST-baseline, and it seems to work, so I use zoom-windows. But, I'm curious: why does this happen?<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:EN-US">Kind regards<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:EN-US">Eskil<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:12.0pt;color:black">From: </span></b><span style="font-size:12.0pt;color:black">Difx-users <difx-users-bounces@listmgr.nrao.edu> on behalf of Eskil Varenius via Difx-users <difx-users@listmgr.nrao.edu><br>
<b>Reply to: </b>Eskil Varenius <eskil.varenius@chalmers.se><br>
<b>Date: </b>Monday, 30 November 2020 at 11:51<br>
<b>To: </b>Adam Deller <adeller@astro.swin.edu.au><br>
<b>Cc: </b>"difx-users@listmgr.nrao.edu" <difx-users@listmgr.nrao.edu><br>
<b>Subject: </b>Re: [Difx-users] A few surprises<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p>Hi Adam,<o:p></o:p></p>
<p>Apologies, but I will have to defer sending additional details as the data in question have already been removed after correlation. (I would like to verify that the files I send indeed produce the errors I claim, so I don't send files with other typos).
Also, I have too many other todo-items to follow this up right now, but we regularly observe with similar settings so I should get another data set to play with in a few weeks. When I do, I will check the input-file differences and let you know, and keep the
data on disk for additional tests. But I did experience the same thing for all similar data so far. Will let you know once I have new data.<o:p></o:p></p>
<p>Cheers<o:p></o:p></p>
<p>Eskil<o:p></o:p></p>
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<p class="MsoNormal">On 2020-11-30 11:43, Adam Deller wrote:<o:p></o:p></p>
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<p class="MsoNormal">Hi Eskil, <o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Thanks for the heads up, the first two are surprising (I'm never surprised by gaps in documentation!) <o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">I've got no experience with the intel compilers, so will pass on that one. For the second, what is the difference in the .input file produced by vex2difx in the two cases? That might help shed some light.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Cheers,<o:p></o:p></p>
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<p class="MsoNormal">Adam<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">On Mon, 30 Nov 2020 at 21:18, Eskil Varenius via Difx-users <<a href="mailto:difx-users@listmgr.nrao.edu">difx-users@listmgr.nrao.edu</a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal">Dear difx developers,<br>
I have noted a few surprises which I would like to report:<br>
<br>
- Compiling DiFX 2.6.1/2.6.2 with intel 2019 compiler, mpifxcorr runs <br>
but refuses to actually read any data. It just sits there, never <br>
starting the correlation. Using intel 2018 compiler instead, everything <br>
works nicely.<br>
<br>
- Correlating mixed-polarisation data (antenna ON: R-pol, OE and OW: X/Y <br>
pol) delivers correlation products on the mixed circ/linear baselines <br>
(R-X and R-Y pol), but not on the linear/linear baselines (XX,XY,YX,YY). <br>
However, if I add zoomwindows - describing the same setup already in the <br>
VEX file, so no actual zooming - then I get also the linear polarisation <br>
products. (I know mixed-pol support is limited, but might as well note <br>
the behaviour.)<br>
<br>
- "difx2mark4 --help" v1.6 does not say it needs .calc files, but seems <br>
it does. So documentation should be amended?<br>
<br>
Kind regards<br>
Eskil<br>
<br>
_______________________________________________<br>
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<a href="https://listmgr.nrao.edu/mailman/listinfo/difx-users" target="_blank">https://listmgr.nrao.edu/mailman/listinfo/difx-users</a><o:p></o:p></p>
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<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">-- <o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:9.5pt">!=============================================================!<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.5pt">A/Prof. Adam Deller <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.5pt">ARC Future Fellow<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.5pt">Centre for Astrophysics & Supercomputing <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.5pt">Swinburne University of Technology <br>
John St, Hawthorn VIC 3122 Australia<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.5pt">phone: +61 3 9214 5307<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.5pt">fax: +61 3 9214 8797<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.5pt"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.5pt">office days (usually): Mon-Thu<br>
!=============================================================!<o:p></o:p></span></p>
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