For discussion of specific patterns or specific families of patterns, both newly-discovered and well-known.
Gustone
Posts: 624
Joined: March 6th, 2019, 2:26 am

New c/10

Code: Select all

x = 28, y = 20, rule = B3/S23
22b2o$4b2o16b2o$4b2o15bo2bo$3bo2bo14b4o$3b4o13bob2obo$2bob2obo13bo2bo$
3bo2bo$20b2o2b2o$2b2o2b2o11bo6bo$bo6bo$20bo4bo$2bo4bo13bo2bo$3bo2bo15b
2o$4b2o$19b2o4b2o$b2o4b2o9bo2bo2bo2bo$o2bo2bo2bo3b2o4b2o4b2o$b2o4b2o6b o4bo4bo$2bo4bo4bo$13b2o!  My favourite oscillator of all time Code: Select all x = 15, y = 13, rule = B3/S23 7bo2$3b2o5b2o$b2o4bo4b2o$5b2ob2o$bobo7bobo$bo2bobobobo2bo$5obobob5o$o
4bo3bo4bo$b3obobobob3o$3bob2obo2bo$8bobo$8b2o!


Moosey
Posts: 3914
Joined: January 27th, 2019, 5:54 pm
Location: A house, or perhaps the OCA board. Or [click to not expand]
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Gustone wrote:
November 15th, 2019, 1:24 pm
New c/10

Code: Select all

x = 28, y = 20, rule = B3/S23
22b2o$4b2o16b2o$4b2o15bo2bo$3bo2bo14b4o$3b4o13bob2obo$2bob2obo13bo2bo$
3bo2bo$20b2o2b2o$2b2o2b2o11bo6bo$bo6bo$20bo4bo$2bo4bo13bo2bo$3bo2bo15b
2o$4b2o$19b2o4b2o$b2o4b2o9bo2bo2bo2bo$o2bo2bo2bo3b2o4b2o4b2o$b2o4b2o6b o4bo4bo$2bo4bo4bo$13b2o!  That's a pretty clever application of toadsuckers I remember seeing people do that with dragons My CA rules can be found here Bill Watterson once wrote: "How do soldiers killing each other solve the world's problems?" Nanho walåt derwo esaato? Code: Select all x = 4, y = 5, rule = B34e5e67c/S23ce45 4o2$b2o$o2bo$b2o!
[[ TRACK 0 -7/325 ZOOM 16 THEME 0 ]]

Gustone
Posts: 624
Joined: March 6th, 2019, 2:26 am

Moosey wrote:
November 15th, 2019, 3:18 pm
Gustone wrote:
November 15th, 2019, 1:24 pm
New c/10

Code: Select all

x = 28, y = 20, rule = B3/S23
22b2o$4b2o16b2o$4b2o15bo2bo$3bo2bo14b4o$3b4o13bob2obo$2bob2obo13bo2bo$
3bo2bo$20b2o2b2o$2b2o2b2o11bo6bo$bo6bo$20bo4bo$2bo4bo13bo2bo$3bo2bo15b
2o$4b2o$19b2o4b2o$b2o4b2o9bo2bo2bo2bo$o2bo2bo2bo3b2o4b2o4b2o$b2o4b2o6b o4bo4bo$2bo4bo4bo$13b2o!  That's a pretty clever application of toadsuckers I remember seeing people do that with dragons And these guys Code: Select all x = 19, y = 38, rule = B3/S23 3bo$b2o$3bo$5b4o$6bo2bo$7b2o$8b2o2$6bo$4b2obob2obobo$5bo6bob2obo$5bo 11bo$5bo4b2o$4b6o$2bo$2o$2bo$8bo$8bo2bo$8bo2bo$9bo$3bo$b2o$3bo$5b6o$6b o4b2o$6bo11bo$6bo6bob2obo$5b2obob2obobo$7bo2$9b2o$8b2o$7bo2bo$6b4o$4bo
$2b2o$4bo!

My favourite oscillator of all time

Code: Select all

x = 15, y = 13, rule = B3/S23
7bo2$3b2o5b2o$b2o4bo4b2o$5b2ob2o$bobo7bobo$bo2bobobobo2bo$5obobob5o$o 4bo3bo4bo$b3obobobob3o$3bob2obo2bo$8bobo$8b2o!  Entity Valkyrie 2 Posts: 855 Joined: February 26th, 2019, 7:13 pm Location: Hijuatl, Zumaland Contact: ### Re: Spaceship Discussion Thread (3,0)/14 (3c/14) partial: Code: Select all x = 23, y = 44, rule = B3/S23 8bo5bo$8bo5bo$7bobo3bobo$8bo5bo$8bo5bo2$4bo13bo$3b3o11b3o$2b2ob2o9b2ob
2o$3b3o11b3o$4bo13bo2$3b3o11b3o$3b3o11b3o5$3b3o11b3o$3b3o11b3o$3bobo 11bobo$3b3o11b3o$3b3o11b3o3$3b3o11b3o$3b3o11b3o3$bo5bo7bo5bo$obo3bobo 5bobo3bobo$3bobo3bo3bo3bobo$3bobo11bobo$3bobo11bobo$obo3bobo5bobo3bobo$o7bo5bo7bo$b7o7b7o$b2obob2o7b2obob2o$bo5bo7bo5bo$2b5o9b5o$2bo3bo9bo3b o$o3bo3bo5bo3bo3bo$o2b3o2bo5bo2b3o2bo$2ob3ob2o5b2ob3ob2o!

Bx222 IS MY WORST ENEMY.

The ENEERG-y of the EVAD is watching.
The 70th NAI-ve guy is watching.

Moosey
Posts: 3914
Joined: January 27th, 2019, 5:54 pm
Location: A house, or perhaps the OCA board. Or [click to not expand]
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Entity Valkyrie 2 wrote:
November 19th, 2019, 6:50 pm
(3,0)/14 (3c/14) partial:

Code: Select all

x = 23, y = 44, rule = B3/S23
8bo5bo$8bo5bo$7bobo3bobo$8bo5bo$8bo5bo2$4bo13bo$3b3o11b3o$2b2ob2o9b2ob 2o$3b3o11b3o$4bo13bo2$3b3o11b3o$3b3o11b3o5$3b3o11b3o$3b3o11b3o$3bobo
11bobo$3b3o11b3o$3b3o11b3o3$3b3o11b3o$3b3o11b3o3$bo5bo7bo5bo$obo3bobo
5bobo3bobo$3bobo3bo3bo3bobo$3bobo11bobo$3bobo11bobo$obo3bobo5bobo3bobo
$o7bo5bo7bo$b7o7b7o$b2obob2o7b2obob2o$bo5bo7bo5bo$2b5o9b5o$2bo3bo9bo3b
o$o3bo3bo5bo3bo3bo$o2b3o2bo5bo2b3o2bo$2ob3ob2o5b2ob3ob2o!  Man, if we get a ship out of this... but hey, it does match for about halfway through the partial, so who knows? It may be a good start My CA rules can be found here Bill Watterson once wrote: "How do soldiers killing each other solve the world's problems?" Nanho walåt derwo esaato? Code: Select all x = 4, y = 5, rule = B34e5e67c/S23ce45 4o2$b2o$o2bo$b2o!
[[ TRACK 0 -7/325 ZOOM 16 THEME 0 ]]

A for awesome
Posts: 2164
Joined: September 13th, 2014, 5:36 pm
Location: Pembina University, Home of the Gliders
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Moosey wrote:
November 19th, 2019, 7:23 pm
Entity Valkyrie 2 wrote:
November 19th, 2019, 6:50 pm
(3,0)/14 (3c/14) partial:

Code: Select all

x = 23, y = 44, rule = B3/S23
8bo5bo$8bo5bo$7bobo3bobo$8bo5bo$8bo5bo2$4bo13bo$3b3o11b3o$2b2ob2o9b2ob 2o$3b3o11b3o$4bo13bo2$3b3o11b3o$3b3o11b3o5$3b3o11b3o$3b3o11b3o$3bobo
11bobo$3b3o11b3o$3b3o11b3o3$3b3o11b3o$3b3o11b3o3$bo5bo7bo5bo$obo3bobo
5bobo3bobo$3bobo3bo3bo3bobo$3bobo11bobo$3bobo11bobo$obo3bobo5bobo3bobo
$o7bo5bo7bo$b7o7b7o$b2obob2o7b2obob2o$bo5bo7bo5bo$2b5o9b5o$2bo3bo9bo3b
o$o3bo3bo5bo3bo3bo$o2b3o2bo5bo2b3o2bo$2ob3ob2o5b2ob3ob2o!  Man, if we get a ship out of this... but hey, it does match for about halfway through the partial, so who knows? It may be a good start Sort of... the problem is there's only one more row to expand it with the current symmetry, and unless something exists at that width (which I would say is unlikely, although you never know), anything wider requires a search at a lower order of symmetry, which would take some ridiculous exponential factor more time to complete at this width/period. praosylen#5847 (Discord) x₁=ηx V*_η=c²√(Λη) K=(Λu²)/2 Pₐ=1−1/(∫^∞_t₀(p(t)ˡ⁽ᵗ⁾)dt) $$x_1=\eta x$$ $$V^*_\eta=c^2\sqrt{\Lambda\eta}$$ $$K=\frac{\Lambda u^2}2$$ $$P_a=1-\frac1{\int^\infty_{t_0}p(t)^{l(t)}dt}$$ Scorbie Posts: 1487 Joined: December 7th, 2013, 1:05 am ### Re: Spaceship Discussion Thread @EV2 @Moosey @A for Awesome EV2 might wanted to point out that this is two **known** discoveries combined. One is the front reaction, which I saw from the forums quite a long time ago, and the other is the 3c/14 partial. Unfortunately it doesn't make a 3c/14 ship more likely, but it's an interesting combination indeed. Best wishes to you, Scorbie Sokwe Moderator Posts: 1682 Joined: July 9th, 2009, 2:44 pm ### Re: Spaceship Discussion Thread To clarify what Scorbie said, the pattern above is just the partial from this post advanced by two generations. Hopefully this may serve as a reminder of this particular problem. However, it is helpful when posting a pattern to mention how it was found or where it came from. By the way, here is the underlying 3c/14 reaction on which this partial is based: Code: Select all x = 15, y = 7, rule = B3/S23 3b3o3b3o$2bo3bobo3bo$2bo3bobo3bo$2bo3bobo3bo$o2b3o3b3o2bo$o13bo$o13bo! I'm not sure who first discovered it. It's probably been independently discovered several times. -Matthias Merzenich wildmyron Posts: 1489 Joined: August 9th, 2013, 12:45 am Location: Western Australia ### Re: Spaceship Discussion Thread Sokwe wrote: November 19th, 2019, 8:43 pm To clarify what Scorbie said, the pattern above is just the partial from this post advanced by two generations. ... but with 2 cells missing from outside the original bounding box. However, it is helpful when posting a pattern to mention how it was found or where it came from. @EV2 This message is intended for you. Please read it. Please follow the advice in it. The latest version of the 5S Project contains over 226,000 spaceships. There is also a GitHub mirror of the collection. Tabulated pages up to period 160 (out of date) are available on the LifeWiki. Entity Valkyrie 2 Posts: 855 Joined: February 26th, 2019, 7:13 pm Location: Hijuatl, Zumaland Contact: ### Re: Spaceship Discussion Thread wildmyron wrote: November 19th, 2019, 9:22 pm Sokwe wrote: November 19th, 2019, 8:43 pm To clarify what Scorbie said, the pattern above is just the partial from this post advanced by two generations. ... but with 2 cells missing from outside the original bounding box. However, it is helpful when posting a pattern to mention how it was found or where it came from. @EV2 This message is intended for you. Please read it. Please follow the advice in it. Extremely sorry for not linking. Oops, I meant this: Code: Select all x = 25, y = 44, rule = B3/S23 9bo5bo$9bo5bo$8bobo3bobo$9bo5bo$9bo5bo2$5bo13bo$4b3o11b3o$3b2ob2o9b2ob
2o$4b3o11b3o$5bo13bo2$4b3o11b3o$4b3o11b3o5$4b3o11b3o$4b3o11b3o$4bobo 11bobo$4b3o11b3o$4b3o11b3o3$4b3o11b3o$4b3o11b3o3$2bo5bo7bo5bo$bobo3bob o5bobo3bobo$o3bobo3bo3bo3bobo3bo$4bobo11bobo$4bobo11bobo$bobo3bobo5bob o3bobo$bo7bo5bo7bo$2b7o7b7o$2b2obob2o7b2obob2o$2bo5bo7bo5bo$3b5o9b5o$3bo3bo9bo3bo$bo3bo3bo5bo3bo3bo$bo2b3o2bo5bo2b3o2bo$b2ob3ob2o5b2ob3ob2o
!

Bx222 IS MY WORST ENEMY.

The ENEERG-y of the EVAD is watching.
The 70th NAI-ve guy is watching.

Entity Valkyrie 2
Posts: 855
Joined: February 26th, 2019, 7:13 pm
Location: Hijuatl, Zumaland
Contact:

(13,1)/31 crawler

Code: Select all

x = 163, y = 57, rule = B3/S23
bo$obo6b3o$b2o4bo3b2o$2bo4bobo2b2o$b2o3bo5bo$7bo2b2o$7bo$15b2o$14b2o$16bo5$35b3o$35bo$36bo4$57bo$56b2o$56bobo5$77b2o$77bobo$77bo5$98b2o$97b
2o$99bo5$118b3o$118bo$119bo4$140bo$139b2o$139bobo5$160b2o$160bobo$160b
o!


Bx222 IS MY WORST ENEMY.

The ENEERG-y of the EVAD is watching.
The 70th NAI-ve guy is watching.

dvgrn
Moderator
Posts: 7379
Joined: May 17th, 2009, 11:00 pm
Contact:

Entity Valkyrie 2 wrote:
November 24th, 2019, 1:25 am
(13,1)/31 crawler

Code: Select all

x = 163, y = 57, rule = B3/S23
bo$obo6b3o$b2o4bo3b2o$2bo4bobo2b2o$b2o3bo5bo$7bo2b2o$7bo$15b2o$14b2o$16bo5$35b3o$35bo$36bo4$57bo$56b2o$56bobo5$77b2o$77bobo$77bo5$98b2o$97b
2o$99bo5$118b3o$118bo$119bo4$140bo$139b2o$139bobo5$160b2o$160bobo$160bo!
There's a stub article on the (13,1)c/31 Pseudo-B climber, and a dedicated forum thread from several years ago.

Based on discoveries so far, it looks like it will be fairly difficult to get the necessary over-unity reactions out of this crawler, to build a self-supporting spaceship -- especially compared to the (27,1)c/72 Herschel-pair climber ((27,1)c/72 Herschel climber on the LifeWiki).

dbell
Posts: 56
Joined: June 27th, 2013, 12:47 am
Contact:

The "Switchwave" entry in the LifeWiki shows a row of switch engines stabilized at the ends by forward glider rakes and block eating reactions.

There is a more efficient stabilization of the switchwave that might be shown instead (or in addition). This has probably been known for a long time.

Code: Select all

#C A "switchwave" created by adding any number of switch engines in
#C between the two "wings" of the population 134 Cordership.
x = 283, y = 283
262boo$248bo9bo3b3o$248b4o5bobobbo$248bo3bo5bo3bobbo$266bo$250b3o10bob o$264boo7boo$273boo5$274boo$274boo$273bobbo4boo$273boboo4boo$270b3o$271boo$253boo9boobbo$253boo8bo4boo$264boboboo$266boo$257b3o$256boo$
241bobo11boobo$240booboo11boo$241boboo12bo$245bo$244bo$244bo3$233bo$232b3o$$232b3o233booboo235bo13215bobo214booboo215boboo219bo218b o218bo3207bo206b3o$$206b3o$207booboo$209bo13$189bobo$188booboo$189b
oboo$193bo$192bo$192bo3$181bo$180b3o$$180b3o181booboo183bo13163bobo 162booboo163boboo167bo166bo166bo3155bo154b3o$$154b3o$155booboo$157bo13$137bobo$136booboo$137boboo$141bo$140bo$140bo3$129bo$128b3o$$128b3o129booboo131bo13111bobo110booboo111boboo115bo114bo114bo 3103bo102b3o$$102b3o$103booboo$105bo13$85bobo$84booboo$85boboo$89bo$
88bo$88bo3$77bo$76b3o$$76b3o77booboo79bo1359bobo58booboo59boboo 63bo62bo62bo351bo50b3o$$50b3o$51booboo$53bo13$33bobo$32booboo$33bo
boo$37bo$36bo$36bo3$25bo$24b3o$$24b3o$25booboo$27bo3$b3o$bbo$bbobbo$bb obbo$3bobo$18boo$18boo$24bo$23b3o$bbo19booboo$bobo18bobo$bbo19bo3$4o$oo3bo13bo$bo4bo11bobo$3boboo11bo$4bo15boo$21bo$18b3o$19boo$16bo$16boo$
16boo$6boo6boo$6boo4boo$12boobo$14boo5$14boo$14boo!

BCNU,
-dbell

Entity Valkyrie 2
Posts: 855
Joined: February 26th, 2019, 7:13 pm
Location: Hijuatl, Zumaland
Contact:

Please update "switchwave" and also make a redirect from "Corderwave":

Code: Select all

x = 282, y = 282, rule = B3/S23
255b3o$255b3o$256bo$257b2o$258bo$257bo14b2o$272b2o3$255b2o$255b2o$256b o$256bo15bo$255bobo15b2o5b2o$254bo16bobo6b2o$255bo2b2o11bo$256bo3bo10b
o$258b2o12b2o$258bo2$266bo3bo$266bo4bo$249bo15b2o4bo$248bobo15bo2bo$266bo2bo$248bo2bo15bobo$250b2o20b3o$251bo22bo$273bo4$248b2o$250bo$248b
2o6$231bobo6bobo$230bo9bobo$231bo2bo6bo$233b3o5$223bo$222bobo2$222bo2b o$224b2o$225bo5$222b2o$224bo$222b2o6$205bobo6bobo$204bo9bobo$205bo2bo 6bo$207b3o5$197bo$196bobo2$196bo2bo$198b2o$199bo5$196b2o$198bo$196b2o
6$179bobo6bobo$178bo9bobo$179bo2bo6bo$181b3o5$171bo$170bobo2$170bo2bo$
172b2o$173bo5$170b2o$172bo$170b2o6$153bobo6bobo$152bo9bobo$153bo2bo6bo$155b3o5$145bo$144bobo2$144bo2bo$146b2o$147bo5$144b2o$146bo$144b2o6$127bobo6bobo$126bo9bobo$127bo2bo6bo$129b3o5$119bo$118bobo2$118bo2bo$
120b2o$121bo5$118b2o$120bo$118b2o6$101bobo6bobo$100bo9bobo$101bo2bo6bo$103b3o5$93bo$92bobo2$92bo2bo$94b2o$95bo5$92b2o$94bo$92b2o6$75bobo6bob o$74bo9bobo$75bo2bo6bo$77b3o5$67bo$66bobo2$66bo2bo$68b2o$69bo5$66b2o$68bo$66b2o6$49bobo6bobo$48bo9bobo$49bo2bo6bo$51b3o5$41bo$40bobo2$40bo 2bo$42b2o$43bo5$40b2o$42bo$40b2o6$23bobo6bobo$22bo9bobo$23bo2bo6bo$25b
3o3$14bo$2o7b2o2bobo$3o6b4o3bo$2obobo7bo$3b2o10bob2o$15bobo$16bo5$22bo
$20b5o$25bo2$23b3o$20bo$14b3o4b2o$5b2o5bo4bo8bo$5b2o6b2o2bo8bobo$13bo
12b2o6$13b2o$13b2o!

has 20 engines.
Bx222 IS MY WORST ENEMY.

The ENEERG-y of the EVAD is watching.
The 70th NAI-ve guy is watching.

Ashmage
Posts: 1
Joined: December 21st, 2019, 2:32 pm

Is this a new spaceship?

Code: Select all

x = 19, y = 41, rule = B3/S23
9bo$8b3o2$5bobo3bobo$b3ob4ob4ob3o$o7bobo7bo$b2o3b3ob3o3b2o$6b2o3b2o$7b 2ob2o$b3obo7bob3o$obobo3bobo3bobobo$obobo2bo3bo2bobobo$bob3o7b3obo2$3b
o11bo$2b2o5bo5b2o$2b3o2b2ob2o2b3o$bo15bo$2bo2bob2ob2obo2bo$3bo2b3ob3o 2bo2$3b2o9b2o2$5bo2b3o2bo$3bobo2b3o2bobo$8bobo$5b3obob3o$3bo11bo$2b2ob
o7bob2o2$5b2ob3ob2o$5b2obobob2o$5b2obobob2o$b2o3b3ob3o3b2o$b2ob3obobob 3ob2o$b2o5bobo5b2o$3bo3bo3bo3bo$3bo3b2ob2o3bo$2b2o11b2o$3bo11bo$3bo11b o!  Code: Select all x = 17, y = 4, rule = B2-ak3-inqy4-a5aijky7e8/S1c23ejkqy4acekqwy5r6ci78 bo$3o12bo$bo12b3o$15bo!


dvgrn
Moderator
Posts: 7379
Joined: May 17th, 2009, 11:00 pm
Contact:

Ashmage wrote:
December 22nd, 2019, 1:46 pm
Is this a new spaceship?...

Code: Select all

[209-cell bilaterally symmetric odd-symmetry c/3 orthogonal spaceship]
It's hard to know. You can see from Golly's Patterns/Life/Spaceships/c3-orthogonal.rle that there are hundreds of c/3 orthogonal spaceships with 50 live cells or less. Nobody has tried to keep an inventory of the millions of c/3 ships with 209 cells or less.

The first nine rows are the same as the first odd-symmetric c/3 spaceship found by David Bell in 1992:

Code: Select all

#C from Spaceships in Conway's Life (Part 3)
#C Article posted by David Bell, 7 Sep 1992
#C The spaceship was apparently discovered in March 1992
x = 19, y = 13, rule = B3/S23
9bo$8bobo$7bo3bo2$b2ob4o3b4ob2o$b2o4b2ob2o4b2o$o2bob3o3b3obo2bo2$8bobo
$6bobobobo$2b2obo7bob2o$2b2o4bobo4b2o$bo3b2o5b2o3bo!
That one is only 59 cells, but I think it would still be fairly hard to make an exhaustive collection of all c/3 ships up to that size.

Lots of other spaceships from 1992 have just the first two rows the same:

Code: Select all

#C sample c/3 spaceship found in an exhaustive search for c/3 ships
#C  that fit inside a 17x79 bounding box
#C David Bell, 9 May 1992
x = 17, y = 35, rule = B3/S23
8bo$7bobo$6bo3bo$7b3o2$5b2o3b2o$2b2o3bobo3b2o$2b2o3bobo3b2o$2o5bobo5b 2o$4b2obobob2o$o6bobo6bo$3b2o2bobo2b2o$bo2bobo3bobo2bo$b2o11b2o$b2o11b 2o$4bo7bo$4b3o3b3o$6bo3bo$3b2obo3bob2o$5b2o3b2o$5bobobobo2$5bo2bo2bo$6b2ob2o$5b2o3b2o2$4bo2b3o2bo$3b11o$3b2obo3bob2o2$7b3o$3bo2b2ob2o2bo$2b
4obobob4o$bo3b2o3b2o3bo$2bo11bo!
Your spaceship is 19 cells wide instead of 17, so it wouldn't have showed up in that old 1992 search. But it's been a quarter-century-plus since then, so it might or might not have turned up in passing in somebody's c/3 search.

Sokwe
Moderator
Posts: 1682
Joined: July 9th, 2009, 2:44 pm

Ashmage wrote:
December 22nd, 2019, 1:46 pm
Is this a new spaceship?
The short answer is "no". When you post a pattern, it would also be nice if you could describe how you found it. This could be as simple as telling us what search program you used (e.g., "found with JLS").

Tim Coe wrote the program knightt to investigate the complete spaceship tree for spaceships of a given speed, period, width, and symmetry. A complete search with knightt gives a set of spaceships that could be used to construct any possible spaceship of the given type and width. I collected together the completed knightt results here. Your spaceship is a period-3 c/3 orthogonal spaceship with a width of 19 and bilateral symmetry. The table in the link indicates that the knightt search has been completed for this type of ship. The results are in c3/c3-w10-o.rle.gz (download and open in Golly) and your ship is in row 29, column 6.

Here are some other spaceship and moving object collections:
• jslife-moving: the most comprehensive collection of moving objects in Life.
• Lots of spaceships: a collection of gfind results compiled by Jason Summers.
• ptpuffer: a collection of c/2 orthogonal puffers by Paul Tooke.
• c/5 rakes: a collection of c/5 orthogonal rakes by Paul Tooke.
Edit:
dvgrn wrote:
December 22nd, 2019, 6:15 pm
Your spaceship is 19 cells wide instead of 17, so it wouldn't have showed up in that old 1992 search. But it's been a quarter-century-plus since then, so it might or might not have turned up in passing in somebody's c/3 search.
This ship is contained in Jason Summers' "lots of spaceships" collection (at "#P 118 286" in this file), so it has been known since October 2000 at the latest.
-Matthias Merzenich

Entity Valkyrie 2
Posts: 855
Joined: February 26th, 2019, 7:13 pm
Location: Hijuatl, Zumaland
Contact:

Spaceship anyone?

Code: Select all

x = 3, y = 3, rule = B3/S23
3o2$obo! #C [[ STOP 4 ]]  Bx222 IS MY WORST ENEMY. Please click here for my own pages. Also, please apgsearch B34t5y7/S23 (B-life) The ENEERG-y of the EVAD is watching. The 70th NAI-ve guy is watching. dvgrn Moderator Posts: 7379 Joined: May 17th, 2009, 11:00 pm Location: Madison, WI Contact: ### Re: Spaceship Discussion Thread Entity Valkyrie 2 wrote: December 24th, 2019, 1:19 am Spaceship anyone? Code: Select all x = 3, y = 3, rule = B3/S23 3o2$obo!
#C [[ STOP 4 ]]

Sure, that's a common c/4 front end. Often shows up in pairs, like in some of these ships. Also look along the left edge of Patterns/Life/Spaceships/c4-orthogonal.rle. Did you look at known c/4 spaceships at all, before posting this?

Hdjensofjfnen
Posts: 1616
Joined: March 15th, 2016, 6:41 pm
Location: r cis θ

Entity Valkyrie 2 wrote:
December 24th, 2019, 1:19 am
Spaceship anyone?

Code: Select all

x = 3, y = 3, rule = B3/S23
3o2$obo! #C [[ STOP 4 ]]  There's a good example in one post that's just a few posts above yours: Gustone wrote: November 15th, 2019, 3:50 pm And these guys Code: Select all x = 19, y = 38, rule = B3/S23 3bo$b2o$3bo$5b4o$6bo2bo$7b2o$8b2o2$6bo$4b2obob2obobo$5bo6bob2obo$5bo 11bo$5bo4b2o$4b6o$2bo$2o$2bo$8bo$8bo2bo$8bo2bo$9bo$3bo$b2o$3bo$5b6o$6b o4b2o$6bo11bo$6bo6bob2obo$5b2obob2obobo$7bo2$9b2o$8b2o$7bo2bo$6b4o$4bo
$2b2o$4bo!


Code: Select all

x = 5, y = 9, rule = B3-jqr/S01c2-in3
3bo$4bo$o2bo$2o2$2o$o2bo$4bo$3bo! Code: Select all x = 7, y = 5, rule = B3/S2-i3-y4i 4b3o$6bo$o3b3o$2o$bo!  mscibing Posts: 74 Joined: May 18th, 2010, 8:30 pm ### Re: Spaceship Discussion Thread Moosey wrote: March 26th, 2019, 12:18 pm Also, if one is found, it should be called scholar or something, because a weekender is a person who spends time in a certain place on weekends while a scholar spends time in a certain place on weekdays. I think scholar is a fine name. My search program found such a friend at 8:21 this morning after 11 days of searching on a Ryzen 5 2400G. Code: Select all  #C 383P7H2V0 #C [[ TRACK 0 -0.2857 ]] x = 23, y = 82, rule = B3/S23 11bo$10b3o$10b3o2$6b3o5b3o2$6bobo5bobo$6bobo5bobo$7bo7bo$6bo2bo3bo2bo$7bob2ob2obo$4bo4bo3bo4bo$4b6o3b6o$4bo4bo3bo4bo$5b2obo5bob2o$9bo3bo$5bo 11bo$5bo3bo3bo3bo$6bo2bo3bo2bo$6bo2bo3bo2bo$b3o3bobo3bobo3b3o$o2bo3b9o 3bo2bo$o2bo2b2ob5ob2o2bo2bo$7b2o2bo2b2o$6b2o3bo3b2o$6b2o7b2o$9b2ob2o$ 6bo3bobo3bo$6bo3bobo3bo$6b2o2bobo2b2o$8b3ob3o$4b2ob2o5b2ob2o$3bo2b2o7b 2o2bo$2bo17bo$3bob3o7b3obo$6bo2bo3bo2bo$7b3o3b3o$4b2o4bobo4b2o$9bo3bo$ 5bo4bobo4bo$2bo6b2ob2o6bo$b2o2b3obo3bob3o2b2o$o5b4o3b4o5bo$bo3b2o2bo3b o2b2o3bo$2b3o2bobo3bobo2b3o2$7b3o3b3o$6b2o7b2o$5b2o9b2o$5bobo7bobo$6bo 9bo$7bobo3bobo$7bobo3bobo$6bo9bo$6bo9bo$6bo3bobo3bo$7bo2bobo2bo$7bo2bo bo2bo2$8b3ob3o$8bobobobo$9b5o$3b3o11b3o$3b3o11b3o$bo3bo11bo3bo$5bo11bo $6bo9bo$bo3bo3bobobo3bo3bo$2b2o4bo5bo4b2o$3bo15bo$4b3o9b3o$5bo5bo5bo$10b3o$9b2ob2o$9b5o$6b3o2bo2b3o$4bo13bo$4bobo9bobo$6bo9bo$3bobo11bobo$2bo2bo11bo2bo$3b2o13b2o! 
I've upload the search script to https://gitlab.com/andrew-j-wade/life_slice_ship_search. The partial spaceship extraction isn't working 100% reliably which manifests as occasional file not found errors, but it doesn't impact the search.

The width is not necessarily minimal; I jumped straight into a width 23 odd symmetric search without trying a width 21 search first.

testitemqlstudop
Posts: 1367
Joined: July 21st, 2016, 11:45 am
Location: in catagolue
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Awesome work on finding the second elementary 2c/7! I think "scholar" is a fine name too. By the way, I've asked seven months ago how to configure your search script for a specific speed....

mscibing
Posts: 74
Joined: May 18th, 2010, 8:30 pm

testitemqlstudop wrote:
December 30th, 2019, 9:07 pm
By the way, I've asked seven months ago how to configure your search script for a specific speed....
Sorry... I need to clean up the user interface. It's down to the --period and --starts parameters, and for oblique spaceships the --shifts parameter as well.
The --period is self explanatory.

The program uses a transformation similar to that described in https://arxiv.org/pdf/cs/0004003.pdf, arranging the rows in all phases into a single sequence. But I punted and entered the transformation pattern directly instead of deriving it from the velocity; this pattern is the --starts parameter. The number cells forward is the period minus the number of starts so if you have a period of 7 and 5 starts coordinates the spaceship would be moving 7-5 = 2 cells every 7 generations.

For "--starts" of 0,2,3,1,6,0,1,2,4,1 the first 5 rows in the search would be:

Code: Select all

3...
....  ^
.5..  | time
.2..  |
....
..4.

And then the pattern will repeat one cell towards the tail and one generation in the past, wrapping around with the period:

Code: Select all

36..
.8..  ^
.5..  | time
.2a.  |
..7.
..4.

Starts like the following would also work okay with my program (I'm not sure this is true of gfind), but would probably result in a slower search than the previous pattern:

Code: Select all

....
....  ^
..5.  | time
..4.  |
..3.
..2.


testitemqlstudop
Posts: 1367
Joined: July 21st, 2016, 11:45 am
Location: in catagolue
Contact:

Okay, I've set up a 3c/8 odd search using the same starts as the 2c/7 odd search. What do the numbers printed by the program represent?

EDIT: It crashed with

Code: Select all

0147/09
error: Os { code: 2, kind: NotFound, message: "No such file or directory" }
0147/10
error: Os { code: 2, kind: NotFound, message: "No such file or directory" }

What does this mean?

Sokwe
Moderator
Posts: 1682
Joined: July 9th, 2009, 2:44 pm

I am once again impressed with the speed of your program! 11 days for a width-23 symmetric search to that depth seems incredibly fast! Since you hadn't given an update on the forums in almost a year and a half, I thought you might have dropped this project. I am relieved to see that you have been working on it all this time.

I am struck by the addition of "scripts to find weekender and spaghetti monster". Spaghetti monster is difficult to find even if you know it's there. I am wondering how much of the spaghetti monster structure you start with in order to find the complete ship, and how quickly does it find it?

Also, your post in the sandbox would have been better suited for the spaceship discussion thread. It is always helpful to see long, new partial results for high-period searches.

Edit: Please answer the following questions in this thread in the scripts forum. When I get a reply, I will also move some of the above posts from here to there.
mscibing wrote:
December 30th, 2019, 10:11 pm
For "--starts" of 0,2,3,1,6,0,1,2,4,1 the first 5 rows in the search would be:

Code: Select all

3...
....  ^
.5..  | time
.2..  |
....
..4.

And then the pattern will repeat one cell towards the tail and one generation in the past, wrapping around with the period:

Code: Select all

36..
.8..  ^
.5..  | time
.2a.  |
..7.
..4.

I'm not sure how to read your diagrams. Here is a guess:

Each point in the grid is a single complete row (in a single phase) of the partial spaceship. A row at a grid point evolves into the row at the grid point directly above it (so row 1 evolves into row 4). When you try to advance a row in the last phase, you go back to the first phase, but shift towards the tail by the number of cells forward each period (2 cells forward, so row 3 evolves into row 1).
mscibing wrote:
December 30th, 2019, 10:11 pm
Starts like the following would also work okay with my program (I'm not sure this is true of gfind), but would probably result in a slower search than the previous pattern:

Code: Select all

....
....  ^
..5.  | time
..4.  |
..3.
..2.

So would the next two iterations through the starts look like this?

Code: Select all

.6...
.....  ^
..5..  | time
..4a.  |
..39.
..28.


Code: Select all

.6c..
..b..  ^
..5..  | time
..4a.  |
..39f
..28e

And a 3c/7 search might look like this ("--starts" of 0,3, 2,2, 4,1, 6,0)?

Code: Select all

45....
.89...  ^
.3c...  | time
..7...  |
..2b..
...6..