Push- and Pull-Ships

For discussion of other cellular automata.
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2718281828
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Push- and Pull-Ships

Post by 2718281828 » January 23rd, 2019, 6:16 pm

This a thread for push and pull ships. Examples are below.

Definition:
A pull and push ships are spaceships. They are pattern that must results from a collision of a spaceship (X) with a constellation of still lifes/oscillators (Y). After some generations the pattern recover a state before the collision but shifted along the travel line of the spaceship X. If the resulting ship has the same direction than the spaceship X then we call it push-ship, if it has the opposite direction then pull ship.

I hope this definition is clear and precise.
Push- and pull-ships are somehow related to SMOS.

Orthogonal push-ships (+ X, Y left):

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x = 15, y = 6, rule = B2ek3aei4kr5q7c/S02-n3ij4krw5r6ik
obo3bo5bobo$3o9b3o4$12bo!

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x = 15, y = 6, rule = B2c3ajkn4knry5ci6c7c/S01c2ak3ceknq4aijny5ceij6in
2bo3bo7bo$b2o10b2o$obo9bobo3$12bo!
Orthogonal pull-ship:

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x = 15, y = 8, rule = B2cek3acij4nr5an7e/S12ikn3iq4art5cnq
6bo$3o3bo$bo10b3o$13bo3$12bo$12bo!
Diagonal push-ship:

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x = 15, y = 6, rule = B2ce3ace4rwz5ci6ak/S02ace3aen4iktwy5jn
b2o5bo4b2o$obo9bobo4$14bo!
Knight push-ship:

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x = 16, y = 7, rule = B2ek3air4jrwy5cnq6c/S12-in3ikq4ijryz5cinr6en7e
2bo4b2o$3o12bo$13b3o4$13b2o!

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Macbi
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Re: Push- and Pull-Ships

Post by Macbi » January 23rd, 2019, 6:39 pm

2718281828 wrote:Push- and pull-ships are somehow related to SMOS.
In particular I'd say that oscillators and still lifes are just a special kind of spaceship (in the same way that squares are just a special kind of rectangle). So a push or pull-ship is just a special kind of SMOS.

It might be interesting to search for a push or pull ship that goes faster than its constituent ship.

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Re: Push- and Pull-Ships

Post by Saka » January 23rd, 2019, 7:05 pm

Macbi wrote:
2718281828 wrote:Push- and pull-ships are somehow related to SMOS.
In particular I'd say that oscillators and still lifes are just a special kind of spaceship (in the same way that squares are just a special kind of rectangle). So a push or pull-ship is just a special kind of SMOS.
I dont think these can be considered as SMOS. SMOS stands for "Spaceships Made of Other Spaceships", and their definition is (according to the wiki) "a spaceship in a cellular automaton, consisting of multiple other spaceships colliding with each other, causing a reaction to place on where all of the spaceships are regenerated separately, but with a displacement value."

Since these are not made of multiple spaceships crashing into each other, rather a spaceship crashing into a non-moving object or a constellation of them, I would not consider these "SMOS".
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x = 17, y = 10, rule = B3/S23
b2ob2obo5b2o$11b4obo$2bob3o2bo2b3o$bo3b2o4b2o$o2bo2bob2o3b4o$bob2obo5b
o2b2o$2b2o4bobo2b3o$bo3b5ob2obobo$2bo5bob2o$4bob2o2bobobo!
(Check gen 2)

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2718281828
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Re: Push- and Pull-Ships

Post by 2718281828 » January 23rd, 2019, 7:16 pm

Macbi wrote:It might be interesting to search for a push or pull ship that goes faster than its constituent ship.
Here, we go, no problem at all even to go much faster:

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x = 15, y = 9, rule = B2cei3any4ir5y/S02ei3ain4aikt6c7e
13bo2$12bobo$bo5bo2$obo3$13bo!

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x = 16, y = 11, rule = B2ci3ajr4aekrtw5ae6k7c/S1e2ai3ny4ajnz5einq6ac7e
13b3o2$13bobo3$7b2o$3o2$obo2$13b2o!

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x = 16, y = 9, rule = B2cek4aijknt5acj6an8/S01e2ace3cen4nrwyz5aijry6kn7
14b2o$15bo$13bobo$8bo$b2o$2bo$obo2$14bo!
They can move with orthogonal speeds of at least c/5, the crashing ship (X) can be quite slow, e.g. c/19 in the latter example.

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2718281828
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Re: Push- and Pull-Ships

Post by 2718281828 » January 23rd, 2019, 7:28 pm

I think the definition requires some adjustments. We should talk about shifting-ships or something like this, with pull and push ships beeing a special case. As the resulting ship can go in any direction:

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x = 16, y = 9, rule = B2-an3n4ajy5q/S012a3cen5c6e
13bo$15bo$13bobo$7bo$o$2bo$obo2$13bo!

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x = 16, y = 8, rule = B2ek3aein4j5nry6c8/S01c2ace3jn4ai5acjk
14bo$13b3o$7bo2$bo$3o2$13bo!

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x = 16, y = 9, rule = B2k3ai4a5qry7e/S01e2ce3ijnr4eknr5anq6c
14bo$13bo$13b3o$7bo$bo$o$3o2$13bo!
Edit1: Also rakes exist:

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x = 27, y = 21, rule = B2-an3acekr4air5enq6i/S12cek3n4krtw5y6ci
25bo$25bo4$25bo$24b3o$13bo10b3o$12bobo4$bo5bo$obo4bo17bo$24bobo5$13bo
11bo$13bo11bo!

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Re: Push- and Pull-Ships

Post by Hunting » January 23rd, 2019, 10:40 pm

Code: Select all

x = 10, y = 5, rule = B2-a3i8/S1e2i3-a4e8
2bo4bo$9bo$2obo3bo$9bo$2bo4bo!
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Favorite gun ever:

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#C Favorite Gun. Found by me.
x = 4, y = 6, rule = B2e3i4at/S1c23cijn4a
o2bo$4o3$4o$o2bo!

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Re: Push- and Pull-Ships

Post by A for awesome » January 24th, 2019, 5:25 pm

The quintessential example:

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x = 3, y = 12, rule = B3/S135
bo$bo7$bo$bo$obo$obo$obo!
x₁=ηx
V ⃰_η=c²√(Λη)
K=(Λu²)/2
Pₐ=1−1/(∫^∞_t₀(p(t)ˡ⁽ᵗ⁾)dt)

$$x_1=\eta x$$
$$V^*_\eta=c^2\sqrt{\Lambda\eta}$$
$$K=\frac{\Lambda u^2}2$$
$$P_a=1-\frac1{\int^\infty_{t_0}p(t)^{l(t)}dt}$$

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Re: Push- and Pull-Ships

Post by Hdjensofjfnen » January 25th, 2019, 11:25 pm

A for awesome wrote:The quintessential example:

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x = 3, y = 12, rule = B3/S135
bo$bo7$bo$bo$obo$obo$obo!
I was surprised to find that the rule has two far more common ships:

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x = 15, y = 6, rule = B3/S135
2bo9bo$b3o7b3o$bobo7bobo$o3bo9bo$bobo10bo$o3bo!
EDIT: By over a factor of 55!
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'Sir, I exist!'
'However,' replied the universe,
'The fact has not created in me
A sense of obligation.'" -Stephen Crane

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x = 7, y = 5, rule = B3/S2-i3-y4i
4b3o$6bo$o3b3o$2o$bo!

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Re: Push- and Pull-Ships

Post by Moosey » January 29th, 2019, 3:57 pm

2718281828 wrote:I think the definition requires some adjustments. We should talk about shifting-ships or something like this, with pull and push ships beeing a special case. As the resulting ship can go in any direction:

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two contradicting spaceships 

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more different direction push ships

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etc.
Edit1: Also rakes exist:

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rakes
Don’t forget that bestfriends diagonal ship!
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Gustone
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Re: Push- and Pull-Ships

Post by Gustone » August 19th, 2019, 6:51 am

neckropost aletr

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x = 27, y = 8, rule = B34t/S235i
bo13bo9bo$3o4b3o4b3o7b3o5$24b3o$14b3o!
I like making color palettes for rules

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