Class: FuzzyAssociativeMemory::LinguisticVariable

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

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(name) ⇒ LinguisticVariable 



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# File 'lib/fuzzy_associative_memory/linguistic_variable.rb', line 15

def initialize(name)
  @name       = name
  @sets = []
end

Instance Attribute Details

#name ⇒ Object (readonly)

Returns the value of attribute name.



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# File 'lib/fuzzy_associative_memory/linguistic_variable.rb', line 13

def name
  @name
end

#sets ⇒ Object

Returns the value of attribute sets.



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# File 'lib/fuzzy_associative_memory/linguistic_variable.rb', line 12

def sets
  @sets
end

Instance Method Details

#[](n) ⇒ Object 



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# File 'lib/fuzzy_associative_memory/linguistic_variable.rb', line 113

def [](n)
  @sets[n]
end

#add_set(set) ⇒ Object 



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# File 'lib/fuzzy_associative_memory/linguistic_variable.rb', line 20

def add_set(set)
  @sets << set
end

#gnuplot(options = {}) ⇒ Object

Shell out to your system’s installed Gnuplot binary to create a graphical depiction of this FLV.

  • Args :

    • options -> a hash of options; see below



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# File 'lib/fuzzy_associative_memory/linguistic_variable.rb', line 30

def gnuplot(options = {})
  return if @sets.empty?

  opts = {
    :logarithmic_x => false # Default to non-log X axis
  }.merge(options)

  datafile = Tempfile.new('fam_')
  begin
    @sets.each_with_index do |s, i|
      if s.is_a? FuzzyAssociativeMemory::Triangle
        datafile.puts "Set#{i} #{s.left} 0"
        datafile.puts "Set#{i} #{s.center} 1"
        datafile.puts "Set#{i} #{s.right} 0"
      end

      if s.is_a? FuzzyAssociativeMemory::Trapezoid
        datafile.puts "Set#{i} #{s.left} 0"
        datafile.puts "Set#{i} #{s.top_left} 1"
        datafile.puts "Set#{i} #{s.top_right} 1"
        datafile.puts "Set#{i} #{s.right} 0"
      end

      datafile.puts "\n\n"
    end
    datafile.close

    min = @sets[0].left
    max = @sets[0].right
    @sets.each do |s|
      min = s.left if s.left < min
      max = s.right if s.right > max
    end

    fn = "#{Dir.tmpdir}/plot of #{name}.svg"

    # set term dumb
    commands = %Q(
      set terminal svg size 1024,400
      set xlabel 'value'
      set ylabel 'membership'
      set xtics autofreq
      set ytics autofreq
      set output "#{fn}"
      set title "Fuzzy sets for #{name}"
      set mytics 4
      set mxtics 4
      set size ratio 0.25
      set grid mxtics xtics ytics

    )

    if opts[:logarithmic_x]
      commands += "set xr [[#{[min, 1].max}:#{max}]\nset logscale x\n"
    else
      commands += "set xr [#{min}:#{max}]\n"
    end

    #         plot "#{datafile.path}" using 2:3 notitle with linespoints lw 2

    plotarr=[]
    @sets.size.times do |i|
      plotarr[i] = %Q("#{datafile.path}" index #{i} using 2:3 notitle with linespoints pt 5 lw 2)
    end

    commands += "  plot " + plotarr.join(', ') + "\n"
    # puts commands

    IO.popen("gnuplot", "w") do |io|
      io.puts commands
    end
    #puts "Plot saved in #{fn}"

  rescue StandardError => e
    puts "Unable to run Gnuplot because #{e.message}"
  ensure
    datafile.close
    datafile.unlink
  end

  return fn if defined?(fn)
end