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