73ef4ff3
 Hu Chunming
提交三方库
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[/
/ Copyright (c) 2009 Steven Watanabe
/
/ Distributed under the Boost Software License, Version 1.0. (See
/ accompanying file LICENSE_1_0.txt or copy at
/ http://www.boost.org/LICENSE_1_0.txt)
]
In addition to the [link boost_random.reference.generators random number generators],
this library provides distribution functions which map one distribution
(often a uniform distribution provided by some generator) to another.
Usually, there are several possible implementations of any given mapping.
Often, there is a choice between using more space, more invocations of the
underlying source of random numbers, or more time-consuming arithmetic such
as trigonometric functions. This interface description does not mandate any
specific implementation. However, implementations which cannot reach certain
values of the specified distribution or otherwise do not converge
statistically to it are not acceptable.
[table Uniform Distributions
[[distribution] [explanation] [example]]
[[__uniform_smallint] [discrete uniform distribution on a small set of integers
(much smaller than the range of the underlying
generator)]
[drawing from an urn]]
[[__uniform_int_distribution] [discrete uniform distribution on a set of integers; the
underlying generator may be called several times to gather
enough randomness for the output]
[drawing from an urn]]
[[__uniform_01] [continuous uniform distribution on the range [0,1);
important basis for other distributions]
[-]]
[[__uniform_real_distribution] [continuous uniform distribution on some range [min, max) of
real numbers]
[for the range [0, 2pi): randomly dropping a stick and
measuring its angle in radians (assuming the angle is
uniformly distributed)]]
]
[table Bernoulli Distributions
[[distribution] [explanation] [example]]
[[__bernoulli_distribution] [Bernoulli experiment: discrete boolean valued
distribution with configurable probability]
[tossing a coin (p=0.5)]]
[[__binomial_distribution] [counts outcomes of repeated Bernoulli
experiments]
[tossing a coin 20 times and counting how many
front sides are shown]]
[[__geometric_distribution] [measures distance between outcomes of repeated
Bernoulli experiments]
[throwing a die several times and counting the
number of tries until a "6" appears for the
first time]]
[[__negative_binomial_distribution] [Counts the number of failures of repeated
Bernoulli experiments required to get some constant
number of successes.]
[flipping a coin and counting the number of
heads that show up before we get 3 tails]]
]
[table Poisson Distributions
[[distribution] [explanation] [example]]
[[__poisson_distribution][poisson distribution]
[counting the number of alpha particles emitted
by radioactive matter in a fixed period of time]]
[[__exponential_distribution] [exponential distribution]
[measuring the inter-arrival time of alpha
particles emitted by radioactive matter]]
[[__gamma_distribution][gamma distribution][-]]
[[__hyperexponential_distribution] [hyperexponential distribution] [service time of k-parallel servers each with a given service rate and probability to be chosen]]
[[__weibull_distribution] [weibull distribution] [-]]
[[__extreme_value_distribution] [extreme value distribution] [-]]
[[__beta_distribution] [beta distribution] [-]]
[[__laplace_distribution] [laplace distribution] [-]]
]
[table Normal Distributions
[[distribution] [explanation] [example]]
[[__normal_distribution] [counts outcomes of (infinitely) repeated Bernoulli
experiments]
[tossing a coin 10000 times and counting how many
front sides are shown]]
[[__lognormal_distribution] [lognormal distribution (sometimes used in
simulations)]
[measuring the job completion time of an assembly
line worker]]
[[__chi_squared_distribution][chi-squared distribution][-]]
[[__non_central_chi_squared_distribution][non-central chi-squared distribution][-]]
[[__cauchy_distribution][Cauchy distribution][-]]
[[__fisher_f_distribution][Fisher F distribution][-]]
[[__student_t_distribution][Student t distribution][-]]
]
[table Sampling Distributions
[[distribution] [explanation] [example]]
[[__discrete_distribution][discrete distribution with specific probabilities][rolling an unfair die]]
[[__piecewise_constant_distribution][-][-]]
[[__piecewise_linear_distribution][-][-]]
]
[table Miscellaneous Distributions
[[distribution] [explanation] [example]]
[[__triangle_distribution] [triangle distribution] [-]]
[[__uniform_on_sphere] [uniform distribution on a unit sphere of arbitrary
dimension]
[choosing a random point on Earth (assumed to be a
sphere) where to spend the next vacations]]
]
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