Module: Distribution::Exponential::Ruby_

Defined in:
lib/distribution/exponential/ruby.rb

Class Method Summary collapse

Class Method Details

.cdf(x, l) ⇒ Object 



13
14
15
16
 
# File 'lib/distribution/exponential/ruby.rb', line 13

def cdf(x,l)
  return 0 if x<0
  1-Math.exp(-l*x)
end

.p_value(pr, l) ⇒ Object 



17
18
19
 
# File 'lib/distribution/exponential/ruby.rb', line 17

def p_value(pr,l)
  (-Math.log(1-pr)).quo(l)
end

.pdf(x, l) ⇒ Object 



9
10
11
12
 
# File 'lib/distribution/exponential/ruby.rb', line 9

def pdf(x,l)
  return 0 if x<0
  l*Math.exp(-l*x)
end

.rng(l, opts = {}) ⇒ Object 



5
6
7
8
 
# File 'lib/distribution/exponential/ruby.rb', line 5

def rng(l, opts = {})
  rng = opts[:random] || Random
  lambda {p_value(rng.rand,l)}
end