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