1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
|
require File.expand_path(File.dirname(__FILE__)+"/spec_helper.rb")
include ExampleWithGSL
describe Distribution::Poisson do
shared_examples_for "poisson engine" do
it "should return correct pdf" do
if @engine.respond_to? :pdf
[0.5,1,1.5].each {|l|
1.upto(5) {|k|
@engine.pdf(k,l).should be_within(1e-10).of( (l**k*Math.exp(-l)).quo(Math.factorial(k)) )
}
}
else
pending("No #{@engine}.pdf")
end
end
it_only_with_gsl "should return correct cdf" do
if @engine.respond_to? :cdf
[0.5,1,1.5,4,10].each {|l|
1.upto(5) {|k|
@engine.cdf(k,l).should be_within(1e-10).of(GSL::Cdf.poisson_P(k,l))
}
}
else
pending("No #{@engine}.cdf")
end
end
it "should return correct p_value" do
pending("No exact p_value")
if @engine.respond_to? :p_value
[0.1,1,5,10].each {|l|
1.upto(20) {|k|
pr=@engine.cdf(k,l)
@engine.p_value(pr,l).should eq(k)
}
}
else
skip("No #{@engine}.p_value")
end
end
end
describe "singleton" do
before do
@engine=Distribution::Poisson
end
it_should_behave_like "poisson engine"
end
describe Distribution::Poisson::Ruby_ do
before do
@engine=Distribution::Poisson::Ruby_
end
it_should_behave_like "poisson engine"
end
if Distribution.has_gsl?
describe Distribution::Poisson::GSL_ do
before do
@engine=Distribution::Poisson::GSL_
end
it_should_behave_like "poisson engine"
end
end
if Distribution.has_java?
describe Distribution::Poisson::Java_ do
before do
@engine=Distribution::Poisson::Java_
end
it_should_behave_like "poisson engine"
it "should return correct cdf" do
[0.5,1,1.5,4,10].each {|l|
1.upto(5) {|k|
@engine.cdf(k,l).should be_within(1e-10).of(Distribution::Poisson::Ruby_.cdf(k,l))
}
}
end
end
end
end
|
