class RubyPager::GaussianNoise
Public Class Methods
new(ex_mean, ex_stddev, ex_rand_helper = lambda { Kernel.rand })
click to toggle source
# File lib/ruby_pager/gaussian_noise.rb, line 5 def initialize(ex_mean, ex_stddev, ex_rand_helper = lambda { Kernel.rand }) @rand_helper = ex_rand_helper @mean = ex_mean @stddev = ex_stddev @valid = false @next = 0 end
Private Class Methods
gaussian(mean, stddev, rand)
click to toggle source
# File lib/ruby_pager/gaussian_noise.rb, line 26 def self.gaussian(mean, stddev, rand) theta = 2 * Math::PI * rand.call rho = Math.sqrt(-2 * Math.log(1 - rand.call)) scale = stddev * rho x = mean + scale * Math.cos(theta) y = mean + scale * Math.sin(theta) return x, y end
Public Instance Methods
rand()
click to toggle source
# File lib/ruby_pager/gaussian_noise.rb, line 13 def rand if @valid then @valid = false return @next else @valid = true x, y = self.class.gaussian(@mean, @stddev, @rand_helper) @next = y return x end end