

 
Manual Reference Pages  ALGORITHM::EVOLUTIONARY::UTILS (3)
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NAME
Algorithm::Evolutionary::Utils  Container module with a hodgepodge of functions
CONTENTS
SYNOPSIS
use Algorithm::Evolutionary::Utils qw(entropy genotypic_entropy hamming consensus average random_bitstring random_number_array decode_string vector_compare );
my $this_entropy = entropy( $population );
#Computes consensus sequence (for binary chromosomes
my $this_consensus = consensus( $population);
DESCRIPTION
Miscellaneous class that contains functions that might be useful
somewhere else, especially when computing EA statistics.
METHODS
entropy( CW$population)
Computes the entropy using the well known Shannon’s formula: <http://en.wikipedia.org/wiki/Information_entropy>
’to avoid botching highlighting
genotypic_entropy( CW$population)
Computes the entropy using the well known Shannon’s formula:
<http://en.wikipedia.org/wiki/Information_entropy> ’to avoid botching
highlighting; in this case we use chromosome frequencies instead of
fitness.
hamming( CW$string_a, CW$string_b )
Computes the number of positions that are different among two strings, the well known Hamming distance.
consensus( CW$population, CW$rough = 0 )
Consensus sequence representing the majoritary value for each bit;
returns the consensus binary string. If rough, then the bit is set only if the
difference is bigger than 0.4 (60/40 proportion).
average( CW$population )
Computes an average of population fitness
random_bitstring( CW$bits )
Returns a random bitstring with the stated number of bits. Useful for testing,mainly
random_number_array( CW$dimensions [, CW$min = 1] [, CW$range = 2] )
Returns a random number array with the stated length. Useful for testing, mainly.
parse_xml( CW$string )
Parses the string and returns an XML tree
decode_string( CW$chromosome, CW$gene_size, CW$min, CW$range )
Decodes to a vector, each one of whose components ranges between $min
and $max. Returns that vector.
It does not work for $gene_size too big. Certainly not for 64, maybe for 32.
Compares vectors, returns 1 if 1 dominates 2, 1 if it’s the other way
round, and 0 if neither dominates the other. Both vectors are supposed
to be numeric. Returns undef if neither is bigger, and they are not
equal. Fails if the length is not the same.
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
perl v5.20.3  ALGORITHM::EVOLUTIONARY::UTILS (3)  20141025 
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