Class: EvoSynth::Mutations::UniformRealMutation

Inherits:
Object
  • Object
show all
Defined in:
lib/evosynth/operators/mutations/uniform_real_mutation.rb

Overview

GLEICHVERTEILTE-REELWERTIGE-MUTATION (Weicker page 131) TODO: needs rdoc

Constant Summary collapse

DEFAULT_PROBABILITY = 
0.1
DEFAULT_STEP_SIZE = 
0.1

Instance Method Summary collapse

Constructor Details

#initialize(probability = DEFAULT_PROBABILITY, step_size = DEFAULT_STEP_SIZE) ⇒ UniformRealMutation

Returns a new instance of UniformRealMutation.



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# File 'lib/evosynth/operators/mutations/uniform_real_mutation.rb', line 36

def initialize(probability = DEFAULT_PROBABILITY, step_size = DEFAULT_STEP_SIZE)
  @probability = probability
  @step_size = step_size
end

Instance Method Details

#mutate(individual) ⇒ Object 



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# File 'lib/evosynth/operators/mutations/uniform_real_mutation.rb', line 41

def mutate(individual)
  mutated = individual.deep_clone
  genome = mutated.genome

  genome.size.times do |index|
    genome[index] += @step_size - 2 * EvoSynth.rand * @step_size if EvoSynth.rand <= @probability
  end

  mutated
end

#to_s ⇒ Object 



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# File 'lib/evosynth/operators/mutations/uniform_real_mutation.rb', line 52

def to_s
  "uniform real mutation <probability: #{@probability}>"
end