diff options
Diffstat (limited to 'spec/ruby/library/matrix/exponent_spec.rb')
-rw-r--r-- | spec/ruby/library/matrix/exponent_spec.rb | 93 |
1 files changed, 45 insertions, 48 deletions
diff --git a/spec/ruby/library/matrix/exponent_spec.rb b/spec/ruby/library/matrix/exponent_spec.rb index 5262627fd5..b76e18b4cd 100644 --- a/spec/ruby/library/matrix/exponent_spec.rb +++ b/spec/ruby/library/matrix/exponent_spec.rb @@ -1,67 +1,64 @@ require_relative '../../spec_helper' +require_relative 'fixtures/classes' +require 'matrix' -ruby_version_is ""..."3.1" do - require_relative 'fixtures/classes' - require 'matrix' +describe "Matrix#**" do - describe "Matrix#**" do + describe "given an integer _n_" do + it "multiples the Matrix by itself _n_ times" do + m = Matrix[ [7,6], [3,9] ] + (m ** 1).should == m + (m ** 2).should == Matrix[ [67, 96], [48,99] ] + (m ** 2).should == m * m + (m ** 3).should == m * m * m + (m ** 4).should == m * m * m * m + (m ** 5).should == m * m * m * m * m + end - describe "given an integer _n_" do - it "multiples the Matrix by itself _n_ times" do - m = Matrix[ [7,6], [3,9] ] - (m ** 1).should == m - (m ** 2).should == Matrix[ [67, 96], [48,99] ] - (m ** 2).should == m * m - (m ** 3).should == m * m * m - (m ** 4).should == m * m * m * m - (m ** 5).should == m * m * m * m * m - end + it "raises a ErrDimensionMismatch for non square matrices" do + m = Matrix[ [1, 1], [1, 2], [2, 3]] + -> { m ** 3 }.should raise_error(Matrix::ErrDimensionMismatch) + -> { m ** 0 }.should raise_error(Matrix::ErrDimensionMismatch) + end - it "raises a ErrDimensionMismatch for non square matrices" do - m = Matrix[ [1, 1], [1, 2], [2, 3]] - -> { m ** 3 }.should raise_error(Matrix::ErrDimensionMismatch) - -> { m ** 0 }.should raise_error(Matrix::ErrDimensionMismatch) + describe "that is < 0" do + it "returns the inverse of **(-n)" do + m = Matrix[ [1, 1], [1, 2] ] + (m ** -2).should == Matrix[ [5, -3], [-3, 2]] + (m ** -4).should == (m.inverse ** 4) end - describe "that is < 0" do - it "returns the inverse of **(-n)" do - m = Matrix[ [1, 1], [1, 2] ] - (m ** -2).should == Matrix[ [5, -3], [-3, 2]] - (m ** -4).should == (m.inverse ** 4) - end + it "raises a ErrNotRegular for irregular matrices" do + m = Matrix[ [1, 1], [1, 1] ] + -> { m ** -2 }.should raise_error(Matrix::ErrNotRegular) + end + end - it "raises a ErrNotRegular for irregular matrices" do + ruby_version_is '3.1.0' do # https://bugs.ruby-lang.org/issues/17521 + describe "that is 0" do + it "returns the identity for square matrices" do m = Matrix[ [1, 1], [1, 1] ] - -> { m ** -2 }.should raise_error(Matrix::ErrNotRegular) + (m ** 0).should == Matrix.identity(2) end - end - - ruby_version_is '3.1.0' do # https://bugs.ruby-lang.org/issues/17521 - describe "that is 0" do - it "returns the identity for square matrices" do - m = Matrix[ [1, 1], [1, 1] ] - (m ** 0).should == Matrix.identity(2) - end - it "raises an ErrDimensionMismatch for non-square matrices" do - m = Matrix[ [1, 1] ] - -> { m ** 0 }.should raise_error(Matrix::ErrDimensionMismatch) - end + it "raises an ErrDimensionMismatch for non-square matrices" do + m = Matrix[ [1, 1] ] + -> { m ** 0 }.should raise_error(Matrix::ErrDimensionMismatch) end end end + end - it "returns the power for non integer powers" do - a = Matrix[[5, 4], [4, 5]] - ((a ** 0.5) ** 2).round(8).should == a - a = Matrix[[7, 10], [15, 22]] - ((a ** 0.25) ** 4).round(8).should == a - end + it "returns the power for non integer powers" do + a = Matrix[[5, 4], [4, 5]] + ((a ** 0.5) ** 2).round(8).should == a + a = Matrix[[7, 10], [15, 22]] + ((a ** 0.25) ** 4).round(8).should == a + end - describe "for a subclass of Matrix" do - it "returns an instance of that subclass" do - (MatrixSub.ins ** 1).should be_an_instance_of(MatrixSub) - end + describe "for a subclass of Matrix" do + it "returns an instance of that subclass" do + (MatrixSub.ins ** 1).should be_an_instance_of(MatrixSub) end end end |