Class: Rubystats::ExponentialDistribution

Inherits:
ProbabilityDistribution show all
Includes:
ExtraMath, NumericalConstants, SpecialMath
Defined in:
lib/rubystats/exponential_distribution.rb

Constant Summary

Constants included from NumericalConstants

NumericalConstants::EPS, NumericalConstants::GAMMA, NumericalConstants::GAMMA_X_MAX_VALUE, NumericalConstants::GOLDEN_RATIO, NumericalConstants::LOG_GAMMA_X_MAX_VALUE, NumericalConstants::MAX_FLOAT, NumericalConstants::MAX_ITERATIONS, NumericalConstants::MAX_VALUE, NumericalConstants::PRECISION, NumericalConstants::SQRT2, NumericalConstants::SQRT2PI, NumericalConstants::TWO_PI, NumericalConstants::XMININ

Instance Attribute Summary

Attributes included from SpecialMath

#log_beta_cache_p, #log_beta_cache_q, #log_beta_cache_res, #log_gamma_cache_res, #log_gamma_cache_x

Instance Method Summary collapse

Methods included from ExtraMath

#binomial

Methods included from SpecialMath

#beta, #beta_fraction, #complementary_error, #error, #gamma, #gamma_fraction, #gamma_series_expansion, #incomplete_beta, #incomplete_gamma, #log_beta, #log_gamma, #orig_gamma

Methods inherited from ProbabilityDistribution

#cdf, #check_range, #find_root, #get_factorial, #icdf, #mean, #pdf, #rng, #variance

Constructor Details

#initialize(decay = 1.0) ⇒ ExponentialDistribution

Returns a new instance of ExponentialDistribution.



13
14
15
16
17
18
 
# File 'lib/rubystats/exponential_distribution.rb', line 13

def initialize(decay=1.0) 
  if decay < 0.0
    raise ArgumentError.new("Decay parameter should be positive.")
  end
  @rate = decay.to_f
end