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require File.expand_path(File.dirname(__FILE__) + '/spec_helper.rb')
describe Distribution::Logistic do
shared_examples_for 'logistic engine' do
it 'should return correct pdf' do
if @engine.respond_to? :pdf
1.upto(10) {
u = rand
s = rand + 1
x = rand * 100 - 50
exp = Math.exp(-(x - u) / s) / (s * (1 + Math.exp(-(x - u) / s)**2))
expect(@engine.pdf(x, u, s)).to eq(exp)
}
else
pending("No #{@engine}.pdf")
end
end
it 'should return correct cdf' do
if @engine.respond_to? :cdf
1.upto(100) {
u = rand
s = rand * 100
x = rand * 100 - 50
exp = 1 / (1 + Math.exp(-(x - u) / s))
expect(@engine.cdf(x, u, s)).to eq(exp)
}
else
pending("No #{@engine}.cdf")
end
end
it 'should return correct p_value' do
if @engine.respond_to? :p_value
1.upto(9) {|i|
u = rand
s = rand * 100
x = @engine.p_value(i / 10.0, u, s)
expect(@engine.cdf(x, u, s)).to be_within(1e-10).of(i / 10.0)
}
else
pending("No #{@engine}.cdf")
end
end
end
describe 'singleton' do
before do
@engine = Distribution::Logistic
end
it_should_behave_like 'logistic engine'
end
describe Distribution::Logistic::Ruby_ do
before do
@engine = Distribution::Logistic::Ruby_
end
it_should_behave_like 'logistic engine'
end
end
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