<div dir="ltr">Hey Eskil,<div><br></div><div>Have you tried vex2difx -v -v and/or valgrind vex2difx to see where the segfault is occurring? Obviously, it shouldn't be segfaulting, so presumably finding that and fixing it should go a fair way towards solving the problem.</div><div><br></div><div>Cheers,</div><div>Adam</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Sat, 12 Aug 2023 at 04:22, Eskil Varenius via Difx-users <<a href="mailto:difx-users@listmgr.nrao.edu">difx-users@listmgr.nrao.edu</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div class="msg-1263332006521108489">
<div lang="en-SE" style="overflow-wrap: break-word;">
<div class="m_-2401142764263263122WordSection1">
<p class="MsoNormal">Dear Difx-users,<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">Background: I have mixed-mode continuum data from 3 stations: Ns(16 MHz VDIF), Ny(16 MHz M5B), Nn 32 MHz VDIF). Ns and Ny observe standard S/X with R-pol only, and Nn (VGOS) observe dual linear X/Y (strictly speaking H/V but I'm using X/Y
here since that's the VEX labels). Correlating Ns-Ny baseline with DiFX 2.6.3, is all good. I use zoom windows (to get 16 MHz from all stations) and FreqId selection (to only correlate X-band and skip S-band channels). But when trying to correlate all three
stations I run into problems. <u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">Problem 1: With DiFX 2.6.3 I can correlate all three stations, and then run difx2mark4. Fourfit then gives me nice fringes on the Ns-Ny baseline (R-R pol), and the Ns-Nn baseline (RX and RY pol). But while I do get nice XR fringes on the
Nn-Ny baseline, I do not get any YR fringes on this baseline. I know the data are good, since I get fringes to these polarisations on another baseline. So I suspect I have fallen into the "Warning: Limited support for mixed-mode..." here, or do you have other
suggestions? <u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">I saw there are improvements for mixed-mode in DiFX 2.8.1, so I decided to try it, but:<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">Problem 2: With DiFX 2.8.1, I get "segfault" when I run <span lang="EN-US">
”</span>vex2difx<span lang="EN-US">” (this worked with 2.6.3)</span>. Any ideas?<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">I guess hunting the "segfault in 2.8.1" is the most profitable route for the future? If so, please let me know what info you may need to speculate further. I am happy to share output, v2d, vex, and even raw data for one scan for someone
to reproduce this if you would be so kind to help.<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">I am very puzzled by this!<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">Kind regards<u></u><u></u></p>
<p class="MsoNormal">Eskil<u></u><u></u></p>
</div>
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</div></blockquote></div><br clear="all"><div><br></div><span class="gmail_signature_prefix">-- </span><br><div dir="ltr" class="gmail_signature"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr" style="font-size:12.8px"><div dir="ltr" style="font-size:12.8px"><div dir="ltr" style="font-size:12.8px"><div dir="ltr" style="font-size:12.8px"><div dir="ltr" style="font-size:12.8px"><div dir="ltr" style="font-size:12.8px">!=============================================================!<br><div dir="ltr" style="font-size:12.8px">Prof. Adam Deller </div></div><div style="font-size:12.8px">Centre for Astrophysics & Supercomputing </div><div dir="ltr" style="font-size:12.8px">Swinburne University of Technology <br>John St, Hawthorn VIC 3122 Australia</div><div style="font-size:12.8px">phone: +61 3 9214 5307</div><div style="font-size:12.8px">fax: +61 3 9214 8797</div><div style="font-size:12.8px">!=============================================================!</div></div></div></div></div></div></div></div></div></div></div></div></div></div></div>