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# Manual Reference Pages  -  ALGORITHM::EVOLUTIONARY::OP::EASY_MO (3)

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### NAME

Algorithm::Evolutionary::Op::Easy_MO - Multiobjecttive evolutionary algorithm, single generation, with
variable operators

### SYNOPSIS

```

#Mutation and crossover. Default selection rate is 0.4
my \$algo = new Algorithm::Evolutionary::Op::Easy_MO( \$eval );

#Define an easy single-generation algorithm with predefined mutation and crossover
my \$m = new Algorithm::Evolutionary::Op::Bitflip; #Changes a single bit
my \$c = new Algorithm::Evolutionary::Op::Crossover; #Classical 2-point crossover
my \$generation = new Algorithm::Evolutionary::Op::Easy_MO( \$rr, 0.2, [\$m, \$c] );

```

### Base Class

Algorithm::Evolutionary::Op::Base

### DESCRIPTION

Easy to use, single generation of an evolutionary algorithm. Takes an arrayref of operators as input, or defines bitflip-mutation and 2-point crossover as default. The apply method applies a single iteration of the algorithm to the population it takes as input

### METHODS

#### new( CW\$eval_func, [\$selection_rate,] [\$operators_arrayref] )

Creates an algorithm that optimizes the handled fitness function and reference to an array of operators. If this reference is null, an array consisting of bitflip mutation and 2 point crossover is generated. Which, of course, might not what you need in case you don’t have a binary chromosome. Take into account that in this case the fitness function should return a reference to array.

#### set( CW\$hashref, codehash, opshash )

Sets the instance variables. Takes a ref-to-hash (for options), codehash (for fitness) and opshash (for operators)

#### apply( CW\$population )

Applies the algorithm to the population; checks that it receives a ref-to-array as input, croaks if it does not. Returns a sorted, culled, evaluated population for next generation.

Algorithm::Evolutionary::Op::CanonicalGA. Algorithm::Evolutionary::Op::FullAlgorithm. Algorithm::Evolutionary::Op::Easy for the scalar version of this code.

```

This file is released under the GPL. See the LICENSE file included in this distribution,

CVS Info: \$Date: 2011/02/14 06:55:36 \$
\$Header: /media/Backup/Repos/opeal/opeal/Algorithm-Evolutionary/lib/Algorithm/Evolutionary/Op/Easy_MO.pm,v 3.6 2011/02/14 06:55:36 jmerelo Exp \$
\$Author: jmerelo \$
\$Revision: 3.6 \$
\$Name \$

```
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