Class: Operator::Shorten

Inherits:
Object
  • Object
show all
Defined in:
../lib/shorten.rb

Overview

Cut off the unused tail of the chromozome. This operator is typically applied after the GE mapping (see Mapping::Base) when there is an information about the numbers of codons used for the phenotype creation. There are two modes of the operation: stochastic and deterministic.

Instance Attribute Summary (collapse)

Instance Method Summary (collapse)

Constructor Details

- (Shorten) initialize

Use the default Kernel.rand and deterministic mode. 



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# File '../lib/shorten.rb', line 12

def initialize
  @random = Kernel
  @stochastic = false
end

Instance Attribute Details

- (Object) random

The source of randomness, used for calling “random.rand( limit )”, defaulting to ‘Kernel’ class. 



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# File '../lib/shorten.rb', line 18

def random
  @random
end

- (Object) stochastic

The mode of the operation: 


   true .. the genotype is shortened at the precisely specified cutting index.
   false .. the genotype is shortened at the random point after the specified index.


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# File '../lib/shorten.rb', line 23

def stochastic
  @stochastic
end

Instance Method Details

- (Object) shorten(gen, max)

Reduce the size of the genotype gen, specifying the max point. See stochastic attribute for meaning of the argument max. 



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# File '../lib/shorten.rb', line 27

def shorten( gen, max )
  return gen.clone if gen.size <= max
  point = @stochastic ? (@random.rand( gen.size+1-max ) + max) : max
  gen.clone[0...point]
end