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A (one dimensional) cellular automaton is a function1 F : Σ → Σ with the property that there is a K > 0 such that F (x)i depends only on the 2K + 1 coordinates xi−K , xi−K+1, . . . , xi−1, xi, xi+1, . . . , xi+K . A periodic point of σ is any x such that σ^p (x) = x for some p ∈ N, and a periodic point of F is any x such that F^q (x) = x for some q ∈ N. Given a cellular automaton F, a point x ∈ Σ is jointly periodic if there are p, q ∈ N such that σ^p (x) = F^q (x) = x, that is, it is a periodic point under both functions.

This project aims to explore the nature of one-dimensional Cellular Automata, in the hope of finding the structure of cellular automata through its periodic points.

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License: MIT
ubuntu2004
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/*

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 * Copyright (C) 2004 Bryant Lee

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 *

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 * This file is part of FPeriod.

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 *

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 * FPeriod is free software; you can redistribute it and/or modify

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 * it under the terms of the GNU General Public License as published by

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 * the Free Software Foundation; either version 2 of the License, or

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 * (at your option) any later version.

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 *

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 * FPeriod is distributed in the hope that it will be useful,

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 * but WITHOUT ANY WARRANTY; without even the implied warranty of

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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

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 * GNU General Public License for more details.

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 *

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 * You should have received a copy of the GNU General Public License

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 * along with FPeriod; if not, write to the Free Software

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 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

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 */

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/* String Ops

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 * Some operations that can be performed on strings

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 *

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 * Written by: Bryant Lee

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 * Date: 10/29/04

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 */

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#ifndef STRING_OPS_H

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#define STRING_OPS_H

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#define byte unsigned char

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#include <string>

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#include <vector>

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void split(const string &str, char c, vector<string> &output);

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void trim(string &str);

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//returns true if c is an upper or lower case letter

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bool alphachar(char c);

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//copy a byte array

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void copyWord(byte *a, byte *b, unsigned int length);

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void copyUIntArray(unsigned int *a, unsigned int *b, unsigned int length);

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void printArray(byte *arr, unsigned int length);

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void printUInt(unsigned int word, unsigned int length);

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void printUIntArray(unsigned int word[], unsigned int length);

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bool iterateWord(byte* arr, unsigned int length, unsigned int shiftSize);

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#endif

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