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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)
@engine.pdf(x,a,b).should be_within(1e-10).of(g)
end
else
pending("No #{@engine}.pdf")
end
end
it_only_with_gsl "should return correct cdf" do
if @engine.respond_to? :cdf
# From GSL-1.9.
tol = 1048576.0*Float::EPSILON
@engine.cdf(0.0, 1.2, 1.3).should eq(0.0)
@engine.cdf(1e-100, 1.2, 1.3).should be_within(tol).of(1.34434944656489596e-120)
@engine.cdf(0.001, 1.2, 1.3).should be_within(tol).of(3.37630042504535813e-4)
@engine.cdf(0.01, 1.2, 1.3).should be_within(tol).of(5.34317264038929473e-3)
@engine.cdf(0.1, 1.2, 1.3).should be_within(tol).of(8.33997828306748346e-2)
@engine.cdf(0.325, 1.2, 1.3).should be_within(tol).of(3.28698654180583916e-1)
@engine.cdf(0.5, 1.2, 1.3).should be_within(tol).of(5.29781429451299081e-1)
@engine.cdf(0.9, 1.2, 1.3).should be_within(tol).of(9.38529397224430659e-1)
@engine.cdf(0.99, 1.2, 1.3).should be_within(tol).of(9.96886438341254380e-1)
@engine.cdf(0.999, 1.2, 1.3).should be_within(tol).of(9.99843792833067634e-1)
@engine.cdf(1.0, 1.2, 1.3).should be_within(tol).of(1.0)
else
pending("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)
@engine.p_value(pr,a, b).should be_within(1e-10).of(x/100.0)
end
else
pending("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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