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
|
require_relative '../../spec_helper'
require_relative 'fixtures/classes'
require 'matrix'
describe "Matrix#*" do
before :each do
@a = Matrix[ [1, 2], [3, 4] ]
@b = Matrix[ [4, 5], [6, 7] ]
end
it "returns the result of multiplying the corresponding elements of self and a Matrix" do
(@a * @b).should == Matrix[ [16,19], [36,43] ]
end
it "returns the result of multiplying the corresponding elements of self and a Vector" do
(@a * Vector[1,2]).should == Vector[5, 11]
end
it "returns the result of multiplying the elements of self and a Fixnum" do
(@a * 2).should == Matrix[ [2, 4], [6, 8] ]
end
it "returns the result of multiplying the elements of self and a Bignum" do
(@a * bignum_value).should == Matrix[
[9223372036854775808, 18446744073709551616],
[27670116110564327424, 36893488147419103232]
]
end
it "returns the result of multiplying the elements of self and a Float" do
(@a * 2.0).should == Matrix[ [2.0, 4.0], [6.0, 8.0] ]
end
it "raises a Matrix::ErrDimensionMismatch if the matrices are different sizes" do
-> { @a * Matrix[ [1] ] }.should raise_error(Matrix::ErrDimensionMismatch)
end
it "returns a zero matrix if (nx0) * (0xn)" do
(Matrix[[],[],[]] * Matrix.columns([[],[],[]])).should == Matrix.zero(3)
end
it "returns an empty matrix if (0xn) * (nx0)" do
(Matrix.columns([[],[],[]]) * Matrix[[],[],[]]).should == Matrix[]
end
it "returns a mx0 matrix if (mxn) * (nx0)" do
(Matrix[[1,2],[3,4],[5,6]] * Matrix[[],[]]).should == Matrix[[],[],[]]
end
it "returns a 0xm matrix if (0xm) * (mxn)" do
(Matrix.columns([[], [], []]) * Matrix[[1,2],[3,4],[5,6]]).should == Matrix.columns([[],[]])
end
it "raises a TypeError if other is of wrong type" do
-> { @a * nil }.should raise_error(TypeError)
-> { @a * "a" }.should raise_error(TypeError)
-> { @a * [ [1, 2] ] }.should raise_error(TypeError)
-> { @a * Object.new }.should raise_error(TypeError)
end
describe "for a subclass of Matrix" do
it "returns an instance of that subclass" do
m = MatrixSub.ins
(m*m).should be_an_instance_of(MatrixSub)
(m*1).should be_an_instance_of(MatrixSub)
end
end
end
|
