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<p class="MsoNormal"><span style="font-size:11.0pt;mso-fareast-language:EN-US">Dear Eric,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;mso-fareast-language:EN-US">Thank you so much for looking into it and figuring it out so quickly. So, if I understand correctly, if I run ‘do_daily.localhost’ script tomorrow, it’ll update AIPS 31DEC2024 and
fix this CVEL issue, right? <o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;mso-fareast-language:EN-US">I’ll do that and try to run CVEL again once the fix is applied to the AIPS in my machine and will report you back how it goes!<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;mso-fareast-language:EN-US">Again, thanks a lot for your help!<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;mso-fareast-language:EN-US">Kind regards,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;mso-fareast-language:EN-US">Jay<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt"><b><span style="color:black">From:
</span></b><span style="color:black">Eric Greisen <egreisen@nrao.edu><br>
<b>Date: </b>Thursday, 17 October 2024 at 04:54<br>
<b>To: </b>Kumar, Jayender (S&A, Marsfield) <Jayender.Kumar@csiro.au><br>
<b>Cc: </b>daip <daip@nrao.edu><br>
<b>Subject: </b>Re: Problems with AIPS CVEL TASK performance {External}<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="color:black">I have found the problem. There was an array that was hard coded 20 instead of MAXSUC which is now 21. The MACARM optimizer put a required variable in a bad place causing the sources to not be recognized. The
MNJ on 31DEC24 tomorrow will fix this. Sadly we can no longer update older versions.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="color:black">Eric Greisen<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:black">From:</span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:black"> Kumar, Jayender (S&A, Marsfield) <Jayender.Kumar@csiro.au><br>
<b>Sent:</b> Tuesday, October 15, 2024 10:44 PM<br>
<b>To:</b> Eric Greisen <egreisen@nrao.edu>; daip <daip@nrao.edu><br>
<b>Subject:</b> Problems with AIPS CVEL TASK performance {External}</span> <o:p></o:p></p>
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<p><span style="font-size:11.0pt">Dear Eric,<o:p></o:p></span></p>
<p><span style="font-size:11.0pt"> <o:p></o:p></span></p>
<p><span style="font-size:11.0pt">I am Jay. I am a postdoctoral research candidate at CSIRO, Australia. I am facing a specific issue with running AIPS task CVEL on my computer (MacBook Pro 2023, chip: Apple M2 Pro, MacOS: Sonoma 14.6.1). I am running AIPS DEC2023
version (I have also tried latest DEC2024 version as well, but the same issue persisted).<o:p></o:p></span></p>
<p><span style="font-size:11.0pt"> <o:p></o:p></span></p>
<p><span style="font-size:11.0pt">Basically, the issue is that though CVEL runs successfully on my system as I can see in message log, but it does not execute any the velocity shift in the data. I have double checked this with POSSM task (by comparing the before
CVEL data (aka uvdata used in CVEL input) and uvdata created after running CVEL task). The output message log for CVEL run in the message window is also not the usual CVEL output messages that I used to see when I was using different machine (Apple MacBook
Pro 2018, and same AIPS version DEC2023).<o:p></o:p></span></p>
<p><span style="font-size:11.0pt"> <o:p></o:p></span></p>
<p><span style="font-size:11.0pt">My uvdata is the VLBA spectral line VLBI data from the BeSSeL project. I am trying to correct for the doppler shift in my spectral line data (22 GHz water maser emission spectra).<o:p></o:p></span></p>
<p><span style="font-size:11.0pt"> <o:p></o:p></span></p>
<p><span style="font-size:11.0pt">Since the same issue persisted with both AIPS versions (DEC2023 and DEC2024), fearing that it might an issue arising because of the “Apple M2 chip” computer, I tried running the CVEL task on that same data but in a different
system (using Ubuntu platform in Windows). The same AIPS versions was used (both DEC2023 and DEC2024). This time, CVEL performed correctly and as expected (please see attached files for message logs). So now I am more certain that the issue with CVEL not performing
as expected is: the Apple M2 Chip system.<o:p></o:p></span></p>
<p><span style="font-size:11.0pt"> <o:p></o:p></span></p>
<p><span style="font-size:11.0pt">I am writing to you in hope that you might have encountered/heard about this issue from other AIPS users, and there is a solution for that. If indeed that’s the case, I kindly request you to please help me with this. Please
guide me on what do I need to do to make CVEL task work properly with my system (MacBook Pro 2023, chip: Apple M2 Pro, MacOS: Sonoma 14.6.1). I would highly appreciate your help in this!<o:p></o:p></span></p>
<p><span style="font-size:11.0pt"> <o:p></o:p></span></p>
<p><span style="font-size:11.0pt">For more details about this, I’ve attached some files which show the CVEL run log when running on my system (MacBook Pro 2023, chip: Apple M2 Pro, MacOS: Sonoma 14.6.1) and through Ubuntu. You can see the difference in the
message logs for the CVEL task between two occasions.<o:p></o:p></span></p>
<p><span style="font-size:11.0pt"> <o:p></o:p></span></p>
<p><span style="font-size:11.0pt">Please let me know if you need any further information on this from me.<o:p></o:p></span></p>
<p><span style="font-size:11.0pt"> <o:p></o:p></span></p>
<p><span style="font-size:11.0pt">Thanks again for your help in advance! I look forward hearing from you!<o:p></o:p></span></p>
<p><span style="font-size:11.0pt"> <o:p></o:p></span></p>
<p><span style="font-size:11.0pt">Kind regards,<o:p></o:p></span></p>
<p><span style="font-size:11.0pt">Jay<o:p></o:p></span></p>
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