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View this ticket online: <a href="https://help.nrao.edu/agent/#app.tickets,t:35003" title="(#)" style="color: #0065A3; font-family: Helvetica, Arial, sans-serif; font-weight: normal; padding: 0; margin: 0; text-align: left; line-height: 1.3; text-decoration: underline;">https://help.nrao.edu/agent/#app.tickets,t:35003</a>
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Richard Dodson <richard.dodson@icrar.org> </td>
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• Richard Dodson <richard.dodson@icrar.org><br>
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Awaiting Agent
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Unsupported OS
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Hmm Now I have sent this, I think you are right. If M=0 we get into the (M4 or M4 & M4 | M
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<div>Hmm <div> Now I have sent this, I think you are right. If M=0 we get into the (M<7) branch, even tho no action is taken.</div></div>
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<div>On Tue, Oct 4, 2022 at 5:40 PM Richard Dodson <<a href="mailto:richard.dodson@icrar.org">richard.dodson@icrar.org</a>> wrote:<br /></div>
<blockquote>
<div>
<div>Hi Eric<div> You are right about the IF statement, but also wrong. After digging into the loop I discovered that it would not matter what to conditional was. </div><div> There are many (too many) nested loops. These grew as I was trying to make the changes to PARANG appear in the analysis. </div><div> It turned out that PARACO had replaced PARANG in most places. Doh!</div><div><br /></div><div> I summarize the code below, where M is MNTYPE(LOOPAN):</div><div><br /></div><div><div> # avoid the M==1 case where no correction is applied</div> If M<1 or M>2;</div><div> # calc parallactic angle</div><div> IF M==3;</div><div> # hobart/EW mount</div><div><div> # calc coparallactic angle</div> else IF M>4 or M<7</div><div> # swap terms for Left/Right options</div><div> if M==4 or M==5</div><div> # Nasmyth form (para + El)</div><div> if M==6 or M==7</div><div> # BWG form (para + El + Az)</div><div> endif</div><div><br /></div> If you run through the steps, both (M>4 & M<7) and (M>4 | M<7) would produce the same branching, within the preexisting IF conditions, <div> However I agree the AND form is more correct in general and have swapped to that. </div><div><div> As requested I have checked the other files that could be updated, and where these are needed updated the call. Some did not need changing as in some cases the parallactic form is correct for types: 0, 4, 5, 6 & 7. (eg text like BRACK = .. in CLCOR.FOR line 3608)<br /></div><div><div> All the files are in the attached compressed tar</div></div></div></div>
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