Class: FuzzyVariable

Inherits:
Object
  • Object
show all
Includes:
Norm
Defined in:
lib/rfuzzy/fuzzy_variable.rb

Overview

Represents fuzzy value belonging to a specific domain. Calculates the adherence on demand.

Constant Summary

Constants included from Norm

Norm::NORM_METHODS

Instance Attribute Summary collapse

Instance Method Summary collapse

Methods included from Norm

norm_method, #s_norm_max_min, #s_norm_prob, #t_norm_max_min, #t_norm_prob

Constructor Details

#initialize(val, &block) ⇒ FuzzyVariable

Constructor. Usage .new(Float value)



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# File 'lib/rfuzzy/fuzzy_variable.rb', line 9

def initialize(val, &block)
	@value = val.to_f
	if block_given?
		yield self
	end
end

Instance Attribute Details

#domain ⇒ Object

Returns the value of attribute domain.



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# File 'lib/rfuzzy/fuzzy_variable.rb', line 5

def domain
  @domain
end

#value ⇒ Object

Returns the value of attribute value.



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# File 'lib/rfuzzy/fuzzy_variable.rb', line 5

def value
  @value
end

Instance Method Details

#*(float) ⇒ Object

returns new FuzzyVariable with value multiplied by float .*(float)



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# File 'lib/rfuzzy/fuzzy_variable.rb', line 22

def *(float)
	return FuzzyVariable.new(@value*float.to_f, @domain)
end

#is(lex_var, method = :auto) ⇒ Object

Calculates the adherence of variable. Usage: .is(String lex_var, Symbol method) <tt>.is(String lex_var)



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# File 'lib/rfuzzy/fuzzy_variable.rb', line 29

def is(lex_var, method = :auto)
	if(method == :auto)
		unless @@norm_method.nil?
			method = @@norm_method
		else
			raise ArgumentError, "Specify method, or call Norm::norm_method"
		end
	end
	if @domain.adherence_functions.has_key? lex_var
		return Adherence.new(@domain.adherence_functions[lex_var].at(@value))
	else
		raise ArgumentError, "Specified adjective '#{lex_var}' does not belong to variable's domain"
	end
end

#is_not(lex_var, method = :auto) ⇒ Object

Calculates negation of variables adherence. Usage - same as .is



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# File 'lib/rfuzzy/fuzzy_variable.rb', line 45

def is_not(lex_var, method = :auto)
	if(method == :auto)
		unless @@norm_method.nil?
			method = @@norm_method
		else
			raise ArgumentError, "Specify method, or call Norm::norm_method"
		end
	end
	if @domain.adherence_functions.has_key? lex_var
		return Adherence.new(1-@domain.adherence_functions[lex_var].at(@value))
	else
		raise ArgumentError, "Specified adjective does not belong to variable's domain"
	end
end

#to_f ⇒ Object 



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# File 'lib/rfuzzy/fuzzy_variable.rb', line 16

def to_f
	return @value
end