/ 
Algorithm-Evolutionary-0.78_1
River stage one • 3 direct dependents • 4 total dependents
/ Algorithm::Evolutionary::Individual::Tree

NAME

Tree - A Direct Acyclic Graph, or tree, useful for Genetic Programming-Style stuff

SYNOPSIS

    use Algorithm::Evolutionary::Individual::Tree;
    #Hash with primitives, arity, and range for constants that multiply it

    my $primitives = { sum => [2, -1, 1],
				   multiply => [2, -1, 1],
				   substract => [2, -1, 1],
				   divide => [2, -1, 1],
				   x => [0, -10, 10],
				   y => [0, -10, 10] };

    my $indi = new Algorithm::Evolutionary::Individual::Tree $primitives, 5 ; # Build random tree with knwo primitives
                                           # and depth up to 5

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

    print $indi3->asString(); #Prints the individual
    print $indi3->asXML() #Prints it as XML. See L<XML> for more info on this

Base Class

Algorithm::Evolutionary::Individual::Base

DESCRIPTION

Tree-like individual for genetic programming. Uses direct acyclic graphs as representation for trees, which is very convenient. This class has not been tested extensively, so it might not work.

METHODS

new( $primitives, $depth, $fitness )

Creates a new tree using a primitives hashref, max depth, and a ref-to-fitness

set

Sets values of an individual; takes a hash as input

randomize

Assigns random values to the elements

fromString

Probably useless, in this case. To be evolved.

clone

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

asString

Prints it

nodePrint

Prints a node

closeParens

Internal subrutine: closes node parenthesis

Atom

Returns the tree, which is atomic by itself. Cannot be used as lvalue

asXML

Prints it as XML. It prints the tree as String, which does not mean you will be able to get it back from this form. It's done just for compatibity, reading from this format will be available. In the future.

addAtom

Dummy sub

lolprint

Print the list of lists that composes the tree, using prefix notation

growSubTree

Grows a random tree, with primitives as indicated, and a certain depth. Depth defaults to 4

size()

Returns 1, since it's got only 1 Atom

Copyright

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

CVS Info: $Date: 2009/07/28 11:30:56 $ 
$Header: /cvsroot/opeal/Algorithm-Evolutionary/lib/Algorithm/Evolutionary/Individual/Tree.pm,v 3.1 2009/07/28 11:30:56 jmerelo Exp $ 
$Author: jmerelo $ 
$Revision: 3.1 $
$Name $