Search found 36 matches

by Jason Summers
January 8th, 2013, 7:01 pm
Forum: Patterns
Topic: Wickstretcher partial result
Replies: 1
Views: 2288

Wickstretcher partial result

I tried to complete a c/4 diagonal wickstretcher, and found what I thought was a breakthrough, but I just can't make it work. Can anyone help finish it? x = 72, y = 81, rule = B3/S23 39bo$38boo$38bobo$$41boo$41boo$32b3o$32bo3booboo$35bob3obo$32bo3b3obbo $27boo4bobo$26boo6bo29bo$28bo$30bo3boo$23boo4b...
by Jason Summers
September 10th, 2012, 7:35 pm
Forum: Scripts
Topic: WinLifeSearch update
Replies: 2
Views: 3103

WinLifeSearch update

I've been working on cleaning up my old WinLifeSearch program a bit, and have made a new release of it, v0.70. Main site Development It has a lot of minor fixes, but no major changes, and no changes to the search algorithms. I haven't decided to what extent I'll keep working on this. I'm interested ...
by Jason Summers
September 8th, 2012, 7:08 pm
Forum: Scripts
Topic: Spaceships that are built from common reactions
Replies: 3
Views: 3859

Re: Spaceships that are built from common reactions

I don't know about a database of reactions that could be combined. It sounds good at first, but without some new idea, there are just too few useful reactions available, and too many miracles that would have to occur. I think that searching for a new or overlooked reaction is probably a better bet t...
by Jason Summers
August 20th, 2012, 8:47 am
Forum: Patterns
Topic: Statorless p3 oscillator
Replies: 4
Views: 3773

Re: Statorless p3 oscillator

Sokwe wrote:Are there any known p4 oscillators in which every cell oscillates at period-4?
No, the only such periods known to me are 1, 2, 3, 6, 8, 13, 15, 30, 33, and 177.
by Jason Summers
August 19th, 2012, 8:10 pm
Forum: Patterns
Topic: Statorless p3 oscillator
Replies: 4
Views: 3773

Statorless p3 oscillator

I found this p3 oscillator that has no stable cells. I think it's the first one known. x = 31, y = 28, rule = B3/S23 9bobo5bo3bo5bobo$8bo3bo4bo3bo4bo3bo$9bo7bo3bo7bo$11b2ob2obo3bob2ob2o$ 17bo3bo$10bo3bo9bo3bo$8bobo17bobo2$8bo19bo$7b2o18b2o$7bo19bo$5bo2bo16b o2bo$o4bo14bo4bo$4ob2ob3o9b4ob2ob3o$3ob2ob...
by Jason Summers
June 7th, 2012, 8:29 pm
Forum: Scripts
Topic: script for puffer producing given output
Replies: 4
Views: 4003

Re: script for puffer producing given output

Does the puffer move left, or right? I don't know of any scripts that would help, but it looks straightforward to construct. I'd use rakes plus these reactions, if possible: .*****...............**** *....*..............*...* .....*..................* *...*...............*..*. ..*......................
by Jason Summers
March 14th, 2012, 9:19 pm
Forum: Patterns
Topic: Glider/**SS Reactions
Replies: 3
Views: 3248

Re: Glider/**SS Reactions

I just wondered whether I have inadvertently discovered any new mechanisms. (a) p48 back rake, using a Schick engine This is larger than known technology; see the c2-extended/c2-0048.lif file in my jslife collection . But the glider release position (at the side) is good, and maybe it could be opti...
by Jason Summers
February 28th, 2012, 11:26 pm
Forum: General Discussion
Topic: The theory behind Primer?
Replies: 7
Views: 2704

Re: The theory behind Primer?

Some more details: The prime number patterns all work by testing odd numbers for odd factors. None of them tests even numbers. Some small numbers, like 2, are handled as special cases (i.e., totally faked). They work by constructing a row of oscillators (or oscillating components) of ever-increasing...
by Jason Summers
February 1st, 2012, 8:51 pm
Forum: Scripts
Topic: Switch engine puffer search script
Replies: 6
Views: 4169

Re: Switch engine puffer search script

To clarify, this is not a way to find completely new puffers. You have to start with a known puffer or near-puffer, and it will try to find different ways that its smoke can stabilize.
by Jason Summers
January 29th, 2012, 10:55 pm
Forum: Scripts
Topic: Switch engine puffer search script
Replies: 6
Views: 4169

Re: Switch engine puffer search script

It's nice, but what might be more useful is a similar search for other rules. It is only feasible to find small puffers, and life has been well searched. I've used random-perturbation scripts like this to find a number of new stable "orbits" into which a puffer's output can fall. The puffer doesn't...
by Jason Summers
January 29th, 2012, 10:49 pm
Forum: Scripts
Topic: Switch engine puffer search script
Replies: 6
Views: 4169

Re: Switch engine puffer search script

Wojowu wrote:Is there a chance for Python version?
It ought to take about half an hour to translate the script to Python. Maybe someone will volunteer? I could probably do it, but I'm a lot more comfortable with Perl than Python.
by Jason Summers
January 29th, 2012, 3:30 pm
Forum: Scripts
Topic: Switch engine puffer search script
Replies: 6
Views: 4169

Switch engine puffer search script

Here's a Golly script I wrote to search for new switch engine puffers; i.e., anything other than the p288 "block maker" or the p384 "glider producer". seo-search.zip This is a long shot at best -- I've mostly given up on it, but I think there's still a chance of success. It requires Perl scripting s...
by Jason Summers
October 30th, 2011, 10:23 pm
Forum: Scripts
Topic: Developing WLS
Replies: 4
Views: 3242

Re: Developing WLS

I think so, too... Does WLS uses the best algorithm, currently? I'm not aware of any breakthroughs in this type of searching. Of course, there are many ways to optimize it. But fundamentally, it's all just brute force: try all possibilities, and eliminate the ones that lead to a contradiction. If s...
by Jason Summers
July 25th, 2011, 5:51 pm
Forum: General Discussion
Topic: Oscillator glide symmetry classes
Replies: 1
Views: 1709

Re: Oscillator glide symmetry classes

Here is Hickerson's classification of the symmetries of finite oscillators, from his "stamp collection": There are 43 types of symmetry that an oscillator can have, taking into account both the symmetry of a single generation and the change of orientation (if any) M generations later. There are 16 t...
by Jason Summers
July 11th, 2010, 3:33 pm
Forum: Patterns
Topic: How to get two gliders in place for a gun
Replies: 4
Views: 2180

Re: How to get two gliders in place for a gun

This is a pathological case where most of the usual glider-insertion methods fail. But there are countless ways to collide gliders and spaceships to produce a glider. Some of them are bound to work, such as x = 321, y = 146, rule = B3/S23 133bo$133bobo$133boo10$16boo$16bobo$16bo$3o$o116bo$bo115bobo$...
by Jason Summers
July 10th, 2010, 4:43 pm
Forum: Patterns
Topic: How to get two gliders in place for a gun
Replies: 4
Views: 2180

Re: How to get two gliders in place for a gun

There are many ways that a glider can suppress the switch engine smoke, but this might be the only one that lets your sideways glider slip past: x = 211, y = 177, rule = B3/S23 172boo$171bobo$173bo6$179b3o$181bo$180bo6$140boo$139bobo$141bo5$109b3o $110bo36b3o$110bobbo35bo$110bobbo34bo$111bobo4$128b3...
by Jason Summers
May 25th, 2010, 8:37 pm
Forum: Scripts
Topic: gencols
Replies: 0
Views: 2741

gencols

I put together a Windows build of Paul Callahan's "gencols" program. It can be downloaded at < http://entropymine.com/jason/life/gencols/gencols-js-1.00.zip >. (Gencols is a search program that enumerates collisions between Life patterns, to find collisions that have certain properties.) Be warned t...
by Jason Summers
May 22nd, 2010, 4:49 pm
Forum: Patterns
Topic: Assisted Lightspeed Wicks
Replies: 5
Views: 3867

Re: Assisted Lightspeed Wicks

I'm not sure if I'm reading your mind correctly... x = 58, y = 31, rule = B3/S23 13bo3bo20bo5bo6bobbo$bo3bo7booboo7boo3boo8bobo9booboo$booboo6bobobobo 6boo3boo8bobo7boobobbo$obobobo5bobobobo5bobbobobbo16bo3boboo$obobobo 17bobbobobbo6booboo5bobo3bobo$13bo3bo21booboo7bobbo$bo3bo7booboo7boo3b oo6bo5bo7...
by Jason Summers
April 23rd, 2010, 9:05 pm
Forum: Patterns
Topic: Agar stabilization discussion
Replies: 4
Views: 2973

Re: Agar stabilization discussion

I've attached a zip file with several agars that look like they might be tamable. Here's a new period 12 oscillator, made from one of the agars: x = 35, y = 35, rule = B3/S23 10boo8boo$9bobbo7boo$4boo3boobobboo$4bobbobobbobobo$booboboobobbobo$bb obobbob3obbobo8bo$bobboo3bo7bo6bobo$bobobboo6bo5boobo...
by Jason Summers
April 20th, 2010, 10:37 pm
Forum: Patterns
Topic: Glider synthesis discussion
Replies: 36
Views: 21983

Re: Glider synthesis discussion

Here's a predecessor of the p32 oscillator that I recently found which looks like it would allow a glider synthesis Here's a synthesis from 37 gliders. x = 89, y = 109, rule = B3/S23 10bo67bo$bobo7boo63boo7bobo$bboo6boo65boo6boo$bbo83bo3$12bobo59bobo$ 13boo59boo$13bo61bo5$67bo$65boo$66boo3$7bo$8bo$...
by Jason Summers
April 19th, 2010, 10:54 pm
Forum: Patterns
Topic: Glider synthesis discussion
Replies: 36
Views: 21983

Re: Glider synthesis discussion

knightlife wrote:If there were a different way to "inject" a boat into its proper place with 3 gliders from only two directions instead of three then the glider count could be reduced by at least 2.
Here's one way:

Code: Select all

x = 10, y = 9, rule = B3/S23
7bo$7bobo$7boo3$5bo$bbobbobo$obobboo$boo!
by Jason Summers
March 28th, 2010, 10:07 pm
Forum: Other Cellular Automata
Topic: Ships with speed between c/2 and c
Replies: 21
Views: 4687

Re: Ships with speed between c/2 and c

I'll have to guess that the answer to both of your questions is no, unless you count this diagonal spaceship in a B0 rule:

Code: Select all

#C 3c/4 diagonal (David Eppstein, 2002)
x = 6, y = 3, rule = B02357/S2356
b2o$o2b3o$ob4o!
by Jason Summers
March 12th, 2010, 10:09 pm
Forum: Patterns
Topic: Glider synthesis discussion
Replies: 36
Views: 21983

Re: Glider synthesis discussion

Here are some predecessors of some large oscillators that might be synthesizable (p9, p16, and p51): The p51 can be done by brute force, if nothing else. x = 77, y = 77, rule = B3/S23 69bo$69bobo$69boo3$bo$bbo$3o12bo27bo$16boo26bo$15boo25b3o17bobo$62boo$ 63bo$9bo28bo$10boo27bo$9boo26b3o17bobo$27bo2...
by Jason Summers
March 9th, 2010, 8:13 pm
Forum: Patterns
Topic: Incomplete search patterns - try to complete
Replies: 185
Views: 331273

Re: Incomplete search patterns - try to complete

Can anyone find a custom p6 sparker to complete this p42 oscillator? x = 44, y = 20, rule = B3/S23 9boo22boo$5boobbobo5boo6boo5bobobboo$4bobbobobo5boo6boo5bobobobbo$4bob obboboo18boobobbobo$3booboobo8bo13bobb3oboo$6bobbooboo3bobo12boobobbo bbo$3boboobboo5bo3bo10bo5bobboo$oboobobo6bobo3bo10b4obo5bo$3...
by Jason Summers
March 9th, 2010, 8:02 pm
Forum: Patterns
Topic: Some new spaceships.
Replies: 34
Views: 32656

Re: Some new spaceships.

With an alternate p2 part, one of the 3c/6 spaceships can delete blocks. It's pretty bulky, but I think that's a first. x = 52, y = 78, rule = B3/S23 35b3o$31b5obbo$27booboobobo3bo$25boobo3bo6bo$oo19b5o4bo6bo$oo15booboob obobo3bo6bobo$15boobo3bo3bo8booboboo$11b5o4bo14boobobobo$10boobobobo3b o13bobbo...