++ed by:

1 PAUSE user
1 non-PAUSE user.

J. J. Merelo-Guervós
and 1 contributors


    Algorithm::Evolutionary::Individual::String - A character string to be evolved. Useful mainly in word games


    use Algorithm::Evolutionary::Individual::String;

    my $indi = new Algorithm::Evolutionary::Individual::String ['a'..'z'], 10;
                                   # Build random bitstring with length 10

    my $indi3 = new Algorithm::Evolutionary::Individual::String;
    $indi3->set( { length => 20, 
                   chars => ['A'..'Z'] } );   #Sets values, but does not build the string
    $indi3->randomize(); #Creates a random bitstring with length as above
    print $indi3->Atom( 7 );       #Returns the value of the 7th character
    $indi3->Atom( 3, 'Q' );       #Sets the value

    $indi3->addAtom( 'K' ); #Adds a new character to the bitstring at the end

    my $indi4 = Algorithm::Evolutionary::Individual::String->fromString( 'esto es un string');   #Creates an individual from that string

    my $indi5 = $indi4->clone(); #Creates a copy of the individual

    my @array = qw( a x q W z ñ); #Tie a String individual
    tie my @vector, 'Algorithm::Evolutionary::Individual::String', @array;
    print tied( @vector )->asXML();
    print $indi3->as_string(); #Prints the individual

Base Class



String Individual for a evolutionary algorithm. Contains methods to handle strings easily. It is also TIEd so that strings can be handled as arrays.



Creates a new random string, with fixed initial length, and uniform distribution of characters along the character class that is defined. However, this character class is just used to generate new individuals and in mutation operators, and the validity is not enforced unless the client class does it


Assigns random values to the elements


Adds an atom at the end


Similar to a copy ctor; creates a bitstring individual from a string. Will be deprecated soon


Similar to a copy ctor; creates a bitstring individual from a string.


Similar to a copy ctor: creates a new individual from another one


Prints it


Sets or gets the value of the n-th character in the string. Counting starts at 0, as usual in Perl arrays.

TIE methods

String implements FETCH, STORE, PUSH and the rest, so an String can be tied to an array and used as such.


Returns length of the string that stores the info; overloads abstract base method.


    Returns the string used as internal representation


Prints it as XML. See Algorithm::Evolutionary::XML for more info on this


Sets or gets the variable that holds the chromosome. Not very nice, and I would never ever do this in C++

Known subclasses

  This file is released under the GPL. See the LICENSE file included in this distribution,
  or go to http://www.fsf.org/licenses/gpl.txt