class EnvelopeAlloc::Provider

Attributes

alloc_num[R]
item_max[R]
total_num[R]
unit[R]

Public Class Methods

new(total_num, alloc_num, options={}) click to toggle source
# File lib/envelope_alloc.rb, line 8
def initialize total_num, alloc_num, options={}
  @total_num = total_num
  @alloc_num = alloc_num
  @unit = options[:unit] || 100
  @item_max = options[:item_max] || (200 * @unit)
end

Public Instance Methods

alloc_items() click to toggle source
# File lib/envelope_alloc.rb, line 15
def alloc_items
  return [total_num] if alloc_num == 1

  money_left = (total_num - alloc_num * unit)

  value_vec = []
  0.upto(alloc_num-2) do |i|
    mu = money_left / (alloc_num - i)
    sigma = mu / 2
    rg = RandomGaussian.new(mu, sigma)
    noise_value = rg.rand.to_i
    noise_value = 0 if noise_value < 0
    noise_value = money_left if noise_value > money_left
    threshold_value = item_max - unit
    noise_value = threshold_value if noise_value > threshold_value
    value_vec << (noise_value + unit)
    money_left -= noise_value
  end

  money_left = (total_num - value_vec.reduce(&:+))
  last_money = money_left > item_max ? item_max : money_left
  value_vec << last_money
  money_left = money_left - last_money
  split_left_items(money_left, value_vec)
  value_vec
end
split_left_items(money_left, value_vec) click to toggle source
# File lib/envelope_alloc.rb, line 42
def split_left_items(money_left, value_vec)
  return unless money_left > 0
  value_vec.map! do |val|
    gap = item_max - val
    if money_left > gap
      money_left -= gap
      item_max
    else
      value = val + money_left
      money_left = 0
      value
    end
  end
end