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ruby--ruby/spec/rubyspec/library/matrix/shared/determinant.rb
eregon 95e8c48dd3 Add in-tree mspec and ruby/spec
* For easier modifications of ruby/spec by MRI developers.
* .gitignore: track changes under spec.
* spec/mspec, spec/rubyspec: add in-tree mspec and ruby/spec.
  These files can therefore be updated like any other file in MRI.
  Instructions are provided in spec/README.
  [Feature #13156] [ruby-core:79246]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@58595 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
2017-05-07 12:04:49 +00:00

38 lines
961 B
Ruby

require 'matrix'
describe :determinant, shared: true do
it "returns the determinant of a square Matrix" do
m = Matrix[ [7,6], [3,9] ]
m.send(@method).should == 45
m = Matrix[ [9, 8], [6,5] ]
m.send(@method).should == -3
m = Matrix[ [9,8,3], [4,20,5], [1,1,1] ]
m.send(@method).should == 95
end
it "returns the determinant of a single-element Matrix" do
m = Matrix[ [2] ]
m.send(@method).should == 2
end
it "returns 1 for an empty Matrix" do
m = Matrix[ ]
m.send(@method).should == 1
end
it "returns the determinant even for Matrices containing 0 as first entry" do
Matrix[[0,1],[1,0]].send(@method).should == -1
end
it "raises an error for rectangular matrices" do
lambda {
Matrix[[1], [2], [3]].send(@method)
}.should raise_error(Matrix::ErrDimensionMismatch)
lambda {
Matrix.empty(3,0).send(@method)
}.should raise_error(Matrix::ErrDimensionMismatch)
end
end