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Rule30: Difference between revisions
Algebraic recurrence relation for rule 30,
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(Algebraic recurrence relation for rule 30,) |
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{{alertbox|Pink|Duplicate of task [[Elementary cellular automaton/Random Number Generator]] please merge with that page pending deletion.}}
[[Category:Cellular Automata]]
This rule is of particular interest because it produces complex, seemingly random patterns from simple, well-defined rules. Because of this, Wolfram believes that Rule 30, and cellular automata in general, are the key to understanding how simple rules produce complex structures and behaviour in nature.
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;Task:
Write a program that prints out the evolution of the rule
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(For
=={{header|C}}==
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return 0;
}</lang>
=={{header|Octave}}==
<lang OCTAVE>
clear all
E=256;
idx=round(E/2);
z(1:1:E^2)=0; % init lattice
z(idx)=1; % seed apex of triangle with a single cell
A=2; % Number of bits rule30 uses 3
for n=1:1:E^2/2-E-2; % lines
theta=0; % theta
for a=0:1:A;
theta=theta+2^a*z(n+A-a);
endfor
delta=(asin(sin (pi/4*(theta-3/4))));
z(n+E+1)=round( (4*delta + pi) / (2*pi) );
endfor
imagesc(reshape(z,E,E)');
</lang>
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