我在学习《R 和 RUBY 数据分析之旅第 3 章》，代码如下：

class Restroom
  attr_reader :queue
  attr_reader :facilities

  def initialize(facilities_per_restroom=3)
    @queue=[]
    @facilities=[]
    @facilities_per_restroom.times{@facilities<<Facility.new}
  end

  def enter(person)
    [email protected]{|facility| not facility.occupied?}
    if unoccupied_facility
      unoccupied_facility.occupy person
    else
      @queue<<person
    end
  end

  def tick
    @facilities.each{|f| f.tick}
  end
end 
# class Restroom


class Facility
  def initialize
    @occupier = nil
    @duration = 0
  end
  def occupy(person)
    unless occupied?
      @occupier = person
      @duration =1
      Person.population.delete person
      true
    else
      false
    end
  end

  def occupied?
    not @occupier.nil?
  end

  def vacate
    Person.population<<@occupier
    @occupier = nil    
  end

  def tick
    if occupied? and @duration > @occupier.use_duration
      vacate
      @duration = 0
    elseif occupied?
      @duration +=1
    end
  end
end
# class Facility

class Person
  @@population = []
  attr_reader :use_duration
  attr_accessor :frequency

  def initialize(frequency=4,use_duration=1)
    @frequency= frequency
    @use_duration=use_duration
  end

  def self.population
    @@population
  end

  def need_to_go?
    rand(DURATION)+1<=@frequenty
  end
end
# class Person

require 'csv'
frequency=3
facilities_per_restroom=3
use_duration=1
population_range=10..600

data={}
population_range.step(10).each do |population_size|
  Person.population.clear
  population_size.times{Person.population<<Person.new(frequency,use_duration)}
  data[population_size]=[]
  restroom=Restroom.new facilities_per_restroom
  DURATION.times do |t|
    data[population_size]<<restroom.queue.size
    queue=restroom.queue.clone
    restroom.queue.clear
    unless queue.empty
      restroom.enter queue.shift
    end
    Person.population.each do |person|
      if person.need_to_do
        restroom.enter person
      end
    end
    restroom.tick
  end
end

CSV.open('simulation1.csv','w') do |csv|
  lbl=[]
  population_range.step(10).each{|population_size|lbl<<population_size}
  csv<<lbl
  DURATION.time do |t|
    row =[]
    population_range.step(10).each do |population_size|
      row <<data[population_size][t]
    end
    csv <<row
  end

end

运行结果如下：

restroom.rb:90:in `step': no block given (LocalJumpError)
from restroom.rb:90


第90行：population_range.step(10).each do |population_size|

哪里错了，请指点！

我在学习《R 和 RUBY 数据分析之旅第 3 章》，代码如下： class Restroom attr_reader :queue attr_reader :facilities

def initialize(facilities_per_restroom=3) @queue=[] @facilities=[] @facilities_per_restroom.times{@facilities<<Facility.new} end

def enter(person) unoccupied_facility=@facilities.find{|facility| not facility.occupied?} if unoccupied_facility unoccupied_facility.occupy person else @queue<<person end end

def tick @facilities.each{|f| f.tick} end end

class Restroom

class Facility def initialize @occupier = nil @duration = 0 end def occupy(person) unless occupied? @occupier = person @duration =1 Person.population.delete person true else false end end

def occupied? not @occupier.nil? end

def vacate Person.population<<@occupier @occupier = nil
end

def tick if occupied? and @duration > @occupier.use_duration vacate @duration = 0 elseif occupied? @duration +=1 end end end

class Facility

class Person @@population = [] attr_reader :use_duration attr_accessor :frequency

def initialize(frequency=4,use_duration=1) @frequency= frequency @use_duration=use_duration end

def self.population @@population end

def need_to_go? rand(DURATION)+1<=@frequenty end end

class Person

require 'csv' frequency=3 facilities_per_restroom=3 use_duration=1 population_range=10..600

data={} population_range.step(10).each do |population_size| Person.population.clear population_size.times{Person.population<<Person.new(frequency,use_duration)} data[population_size]=[] restroom=Restroom.new facilities_per_restroom DURATION.times do |t| data[population_size]<<restroom.queue.size queue=restroom.queue.clone restroom.queue.clear unless queue.empty restroom.enter queue.shift end Person.population.each do |person| if person.need_to_do restroom.enter person end end restroom.tick end end

CSV.open('simulation1.csv','w') do |csv| lbl=[] population_range.step(10).each{|population_size|lbl<<population_size} csv<<lbl DURATION.time do |t| row =[] population_range.step(10).each do |population_size| row <<data[population_size][t] end csv <<row end

end

运行结果如下： restroom.rb:90:in `step': no block given (LocalJumpError) from restroom.rb:90

第 90 行：population_range.step(10).each do |population_size|

哪里错了，请指点！