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require File.expand_path('../../../spec_helper', __FILE__)
require 'matrix'
ruby_version_is "1.9.3" do
describe "Matrix#permutation?" do
it "returns true for a permutation Matrix" do
Matrix[[0, 1, 0], [0, 0, 1], [1, 0, 0]].permutation?.should be_true
end
it "returns false for a non permutation square Matrix" do
Matrix[[0, 1], [0, 0]].permutation?.should be_false
Matrix[[-1, 0], [0, -1]].permutation?.should be_false
Matrix[[1, 0], [1, 0]].permutation?.should be_false
Matrix[[1, 0], [1, 1]].permutation?.should be_false
end
it "returns true for an empty 0x0 matrix" do
Matrix.empty(0,0).permutation?.should be_true
end
it "raises an error for rectangular matrices" do
[
Matrix[[0], [0]],
Matrix[[0, 0]],
Matrix.empty(0, 2),
Matrix.empty(2, 0),
].each do |rectangual_matrix|
lambda {
rectangual_matrix.permutation?
}.should raise_error(Matrix::ErrDimensionMismatch)
end
end
end
end
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