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require File.expand_path(File.dirname(__FILE__) + '/spec_helper.rb')
include ExampleWithGSL
describe Distribution::Beta do
shared_examples_for 'Beta engine' do
it_only_with_gsl 'should return correct pdf' do
if @engine.respond_to? :pdf
1.upto(101) do |x|
a = rand * x
b = 1 + rand * 5
g = GSL::Ran.beta_pdf(x, a, b)
expect(@engine.pdf(x, a, b)).to be_within(1e-09).of(g)
end
else
skip("No #{@engine}.pdf")
end
end
it_only_with_gsl 'should return correct cdf' do
if @engine.respond_to? :cdf
# From GSL-1.9.
tol = 1_048_576.0 * Float::EPSILON
expect(@engine.cdf(0.0, 1.2, 1.3)).to eq(0.0)
expect(@engine.cdf(1e-100, 1.2, 1.3)).to be_within(tol).of(1.34434944656489596e-120)
expect(@engine.cdf(0.001, 1.2, 1.3)).to be_within(tol).of(3.37630042504535813e-4)
expect(@engine.cdf(0.01, 1.2, 1.3)).to be_within(tol).of(5.34317264038929473e-3)
expect(@engine.cdf(0.1, 1.2, 1.3)).to be_within(tol).of(8.33997828306748346e-2)
expect(@engine.cdf(0.325, 1.2, 1.3)).to be_within(tol).of(3.28698654180583916e-1)
expect(@engine.cdf(0.5, 1.2, 1.3)).to be_within(tol).of(5.29781429451299081e-1)
expect(@engine.cdf(0.9, 1.2, 1.3)).to be_within(tol).of(9.38529397224430659e-1)
expect(@engine.cdf(0.99, 1.2, 1.3)).to be_within(tol).of(9.96886438341254380e-1)
expect(@engine.cdf(0.999, 1.2, 1.3)).to be_within(tol).of(9.99843792833067634e-1)
expect(@engine.cdf(1.0, 1.2, 1.3)).to be_within(tol).of(1.0)
else
skip("No #{@engine}.cdf")
end
end
it 'should return correct p_value' do
if @engine.respond_to? :p_value
2.upto(99) do |x|
a = rand * x
b = 1 + rand * 5
pr = @engine.cdf(x / 100.0, a, b)
expect(@engine.p_value(pr, a, b)).to be_within(1e-09).of(x / 100.0)
end
else
skip("No #{@engine}.p_value")
end
end
end
describe 'singleton' do
before do
@engine = Distribution::Beta
end
it_should_behave_like 'Beta engine'
end
describe Distribution::Beta::Ruby_ do
before do
@engine = Distribution::Beta::Ruby_
end
it_should_behave_like 'Beta engine'
end
if Distribution.has_gsl?
describe Distribution::Beta::GSL_ do
before do
@engine = Distribution::Beta::GSL_
end
it_should_behave_like 'Beta engine'
end
end
if Distribution.has_java?
describe Distribution::Beta::Java_ do
before do
@engine = Distribution::Beta::Java_
end
it_should_behave_like 'Beta engine'
end
end
end
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