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require File.expand_path('../../../../spec_helper', __FILE__)
require 'matrix'
describe "Matrix::LUPDecomposition#determinant" do
it "returns the determinant when the matrix is square" do
a = Matrix[[7, 8, 9], [14, 46, 51], [28, 82, 163]]
a.lup.determinant.should == 15120 # == a.determinant
end
it "raises an error for rectangular matrices" do
[
Matrix[[7, 8, 9], [14, 46, 51]],
Matrix[[7, 8], [14, 46], [28, 82]],
].each do |m|
lup = m.lup
lambda {
lup.determinant
}.should raise_error(Matrix::ErrDimensionMismatch)
end
end
end
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