Class: MinEasom

Inherits:
Min2DSingleObjectiveFunc show all
Defined in:
lib/feldtruby/optimize/problems/single_objective_problems.rb

Overview

This is Easom’s function as stated on the page:

http://en.wikipedia.org/wiki/Test_functions_for_optimization

Constant Summary collapse

PI = 
Math::PI

Instance Attribute Summary

Attributes inherited from FeldtRuby::Optimize::Objective

#best_candidate, #current_version, #global_max_values_per_goal, #global_min_values_per_goal

Attributes included from FeldtRuby::Logging

#logger

Instance Method Summary collapse

Methods inherited from Min2DSingleObjectiveFunc

#dimensions

Methods inherited from MinSingleObjectiveFunc

#objective_min_func

Methods inherited from MinContinousFunction

#dimensions, #domain_as_mins_maxs, #search_space

Methods inherited from FeldtRuby::Optimize::Objective

#aggregated_quality, #calculate_sub_qualities_of, #goal_methods, #hat_compare, #initialize, #invalidate_quality_of, #is_better_than?, #is_better_than_for_goal?, #is_goal_method?, #is_min_goal?, #is_min_goal_method?, #map_candidate_to_object_to_be_evaluated, #note_end_of_optimization, #num_goals, #quality_of, #rank_candidates, #sub_qualities_of, #weights, #weights=

Methods included from FeldtRuby::Logging

#__find_logger_set_on_instance_vars, #new_default_logger, #setup_logger_and_distribute_to_instance_variables

Constructor Details

This class inherits a constructor from FeldtRuby::Optimize::Objective

Instance Method Details

#calc_func(candidate) ⇒ Object 



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# File 'lib/feldtruby/optimize/problems/single_objective_problems.rb', line 148

def calc_func(candidate)
  x, y = candidate[0], candidate[1]

  f1 = Math.cos(x)

  f2 = Math.cos(y)

  x_min_pi = x - PI
  y_min_pi = y - PI

  f3 = Math.exp(-(x_min_pi*x_min_pi + y_min_pi*y_min_pi))

  (-f1) * f2 * f3
end

#domain_per_dimension ⇒ Object 



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# File 'lib/feldtruby/optimize/problems/single_objective_problems.rb', line 144

def domain_per_dimension
  [-100.0, 100.0]
end

#min_solutions ⇒ Object 



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# File 'lib/feldtruby/optimize/problems/single_objective_problems.rb', line 140

def min_solutions
  [[PI, PI]]
end

#minimum ⇒ Object 



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# File 'lib/feldtruby/optimize/problems/single_objective_problems.rb', line 134

def minimum
  -1.0
end