File: ruby.rb

package info (click to toggle)
ruby-distribution 0.7.3%2Bdfsg-1
  • links: PTS, VCS
  • area: main
  • in suites: buster, stretch
  • size: 624 kB
  • ctags: 379
  • sloc: ruby: 4,283; makefile: 7
file content (23 lines) | stat: -rw-r--r-- 472 bytes parent folder | download | duplicates (2) 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
 
module Distribution
  module Exponential
    module Ruby_
      class << self
        def rng(l, opts = {})
          rng = opts[:random] || Random
          lambda {p_value(rng.rand,l)}
        end
        def pdf(x,l)
          return 0 if x<0
          l*Math.exp(-l*x)
        end
        def cdf(x,l)
          return 0 if x<0
          1-Math.exp(-l*x)
        end
        def p_value(pr,l)
          (-Math.log(1-pr)).quo(l)
        end
      end
    end
  end
end