Class: EvoSynth::BinaryGenome

Inherits:
Array
  • Object
show all
Defined in:
lib/evosynth/core/binary_genome.rb

Overview

Binary genome which keeps track of changes (changed attribute) to reduce the need to recalculate the fitness function (see Evaluator)

This genome is a simple bitstring and each gene is a boolean.

FIXME: implment in C for better performance - right now its pretty useless TODO: complete documentation

Instance Method Summary collapse

Constructor Details

#initialize(intial_value = 0) ⇒ BinaryGenome

Creates a BinaryGenome with a given initial (Integer) value. Default constructs a new BinaryGenome with the initial value of 0.



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# File 'lib/evosynth/core/binary_genome.rb', line 40

def initialize(intial_value = 0)
  @data = intial_value
  @changed = true
end

Instance Method Details

#[](*args) ⇒ Object

Array like index accessor

index
index, length
range


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# File 'lib/evosynth/core/binary_genome.rb', line 71

def [](*args)
  if args.size == 1

    case args[0]
      when Numeric
        @data[args[0]]
      when Range
        get_sub_range args[0]
      else
        raise ArgumentError, "argument should be either index or range"
      end

  elsif args.size == 2
    get_sub_range Range.new(args[0], args[0] + args[1] - 1)
  else
    raise ArgumentError, "wrong number of arguments"
  end
end

#[]=(*args) ⇒ Object

Array like index accessor



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# File 'lib/evosynth/core/binary_genome.rb', line 92

def []=(*args)
  if args.size == 2

    case args[0]
      when Numeric
        set_gene(args[0], args[1])
      when Range
        case args[1]
          when Numeric
            args[0].each { |index| set_gene(index, args[1]) }
          when Array
            offset = args[0].begin
            args[0].each { |index| set_gene(index, args[1][index - offset]) }
          else
            raise ArgumentError, "argument (1) should be either index or range"
        end

      else
        raise ArgumentError, "argument (0) should be either index or range"
      end

  elsif args.size == 3
    args[1].times { |offset| set_gene(args[0] + offset, args[2]) }
  else
    raise ArgumentError, "wrong number of arguments"
  end
end

#changed=(value) ⇒ Object

Set the changed flag (boolean) of the genome



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# File 'lib/evosynth/core/binary_genome.rb', line 47

def changed=(value)
  @changed = value
end

#changed? ⇒ Boolean

True if the genome has changed, false otherwise. Has to be set to false manually.

Returns:

  • (Boolean) 


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# File 'lib/evosynth/core/binary_genome.rb', line 53

def changed?
  @changed
end

#clone ⇒ Object

Returns a clone of this genome



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# File 'lib/evosynth/core/binary_genome.rb', line 59

def clone
  my_clone = BinaryGenome.new(@data)
  my_clone.changed = false
  my_clone
end

#flip!(index) ⇒ Object

Flips (inverts) the gene at the given index



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# File 'lib/evosynth/core/binary_genome.rb', line 122

def flip!(index)
  @data = @data ^ (1 << index)
end

#size ⇒ Object

Returns the size (in bits) of this genome.



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# File 'lib/evosynth/core/binary_genome.rb', line 128

def size
  @size = @data.to_s(2).size unless defined? @size
  @size
end

#to_s ⇒ Object

Return a printable version of the genome



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# File 'lib/evosynth/core/binary_genome.rb', line 135

def to_s
  @data.to_s(2)
end