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Re: Tristable oscillator

by ikegami (Pope)
on Jul 08, 2008 at 21:47 UTC ( #696348=note: print w/replies, xml ) Need Help??

in reply to Tristable oscillator

Very neat! But it has four states.
State 1: y,ys,sy,,s,ys,sy, State 2: s,sy,sy,,y,sy,ys, State 3: y,ys,ys,,s,ys,sy, State 4: y,sy,ys,,s,ys,sy, State 2: s,sy,sy,,y,sy,ys, ...

That it has a distinct "initializing" state could seen as an advantage. If not, change the initial string to one of states 2, 3 or 4 to get a purely three state engine.

State 1: y,sy,ys,,s,ys,sy, State 2: s,sy,sy,,y,sy,ys, State 3: y,ys,ys,,s,ys,sy, State 1: y,sy,ys,,s,ys,sy, ...

Modified engine that tracks the states:

use strict; use warnings; local $_ = 'y,ys,sy,,s,ys,sy,'; my %h; my $i; for my $n (1 .. $ARGV[0] || 12) { $h{$_} ||= ++$i; print("State $h{$_}: $_\n"); eval; }

As for your question, longer is trivial. Shorter, on the other hand...

State 1: y/123/231/ State 2: y/231/312/ State 3: y/312/123/ State 1: y/123/231/ ...

And with an "initializing" state:

State 1: y/123i/231/ State 2: y/2311/312/ State 3: y/3122/123/ State 4: y/1233/231/ State 2: y/2311/312/

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Re^2: Tristable oscillator
by Prof Vince (Friar) on Jul 09, 2008 at 13:50 UTC
    Yes, it has an initializing state. I didn't thought of specifying it because it was transient.

    With longer I meant "of longer period", but your examples show us how to actually get any permutation !

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