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