Actually, I have found a way, but it is cheating, and not suitable for a real-life project. Just start the sequence from the other end of the survey. Now I expect it is not possible to make a gap at station 2. #set gap at station 7 by starting from station 11 extend start 11 extend left 11 extend ignore 7 8 extend right 2 10 extend right 10 processing extended elevation ... START 11@extendedloop LEFT 7@extendedloop LEFT 6@extendedloop LEFT 5@extendedloop LEFT 4@extendedloop LEFT 3@extendedloop LEFT 2@extendedloop RIGHT 10@extendedloop RIGHT 9@extendedloop RIGHT 8@extendedloop RIGHT 7@extendedloop #gap here BACK 9@extendedloop BACK 10@extendedloop BACK 2@extendedloop LEFT 1@extendedloop done From: Therion <therion-bounces@speleo.sk> On Behalf Of Bruce Mutton Sent: Tuesday, 7 July 2020 20:59 To: 'List for Therion users' <therion@speleo.sk> Subject: Re: [Therion] Revisiting Breaking extended elevations on specific stations OK, I give up I think. It might not be possible to break a loop at it’s closing end. Tarquin’s example… 1 2 1 0 -10 2 3 1 0 -10 3 4 1 45 -10 4 5 1 45 -10 5 6 1 45 -10 6 7 1 90 -10 7 8 1.71 225 60 8 9 1 225 10 9 10 1 225 10 10 2 1.8 225 -32.2 7 11 1 90 -10 # set gap at station 2 extend start 1 extend ignore 2 10 extend left 8 processing extended elevation ... START 1@extendedloop RIGHT 2@extendedloop RIGHT 3@extendedloop RIGHT 4@extendedloop RIGHT 5@extendedloop RIGHT 6@extendedloop RIGHT 7@extendedloop RIGHT 11@extendedloop BACK 7@extendedloop LEFT 8@extendedloop LEFT 9@extendedloop LEFT 10@extendedloop LEFT 2@extendedloop #gap here done Looking at therion.log transcript we can see that Therion traverses 1 2 3 4 5 6 7 11, then steps back to 7 before stepping to 8 9 10 2 and consequently leaving a gap between two 2s. If we had a statement to tell Therion to step back beyond 7 to 2, and THEN start generating we might get 2 10 9 8 7 and leaving a gap between two 7s. This would play havoc with my ‘extend ignore’ rules of thumb for predicting gap locations though. https://therion.speleo.sk/wiki/extend#summary_of_all_extend_options_for_surv... Another solution might be for ‘extend right 2 10’ etc to be an implied ‘extend ignore’ for any other legs emanating from station 2. But that would break many existing extended elevations, so although more intuitive, lets cancel that idea! Bruce -----Original Message----- From: Therion <therion-bounces@speleo.sk <mailto:therion-bounces@speleo.sk> > On Behalf Of Tarquin Wilton-Jones via Therion Sent: Tuesday, 7 July 2020 09:12 To: Therion <therion@speleo.sk <mailto:therion@speleo.sk> > Cc: Tarquin Wilton-Jones <tarquin.wilton-jones@ntlworld.com <mailto:tarquin.wilton-jones@ntlworld.com> > Subject: [Therion] Revisiting Breaking extended elevations on specific stations Hi all, I have a puzzle that comes from my old puzzle: <https://therion.speleo.sk/wiki/breakingextend> https://therion.speleo.sk/wiki/breakingextend 1 2 1 0 -10 2 3 1 0 -10 3 4 1 45 -10 4 5 1 45 -10 5 6 1 45 -10 6 7 1 90 -10 7 8 1.71 225 60 8 9 1 225 10 9 10 1 225 10 10 2 1.8 225 -32.2 7 11 1 90 -10 Imagine you want to break the loop at station 7, so that Therion shows 1-2-3-4-5-6-7-11 as a single line, then 2-10-9-8-7 as a branch off it. The break should be at the end of the branch: 10-9-8-7 / 1-2-3-4-5-6-7-11 If you say "extend ignore 7" or "extend ignore 7 6" it will do this: 1-2-10-9-8-7-11 \ 3-4-5-6-7 Breaks at the right station, but on the wrong branch. You can do "extend ignore 8 7" to break at the wrong station on the right branch. If you use "extend ignore 7 11" it ignores you, and breaks at the natural point, leg 2-3. Is it actually possible to break at station 7 along the 2-10-9-8-7 branch? Cheers! Tarquin _______________________________________________ Therion mailing list <mailto:Therion@speleo.sk> Therion@speleo.sk <https://mailman.speleo.sk/listinfo/therion> https://mailman.speleo.sk/listinfo/therion
