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require File.expand_path('../../../spec_helper', __FILE__)
require 'matrix'
describe "Matrix#antisymmetric?" do
it "returns true for an antisymmetric Matrix" do
Matrix[[0, -2, Complex(1, 3)], [2, 0, 5], [-Complex(1, 3), -5, 0]].antisymmetric?.should be_true
end
it "returns true for a 0x0 empty matrix" do
Matrix.empty.antisymmetric?.should be_true
end
it "returns false for non-antisymmetric matrices" do
[
Matrix[[1, 2, 3], [4, 5, 6], [7, 8, 9]],
Matrix[[1, -2, 3], [2, 0, 6], [-3, -6, 0]], # wrong diagonal element
Matrix[[0, 2, -3], [2, 0, 6], [-3, 6, 0]] # only signs wrong
].each do |matrix|
matrix.antisymmetric?.should be_false
end
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 |rectangular_matrix|
lambda {
rectangular_matrix.antisymmetric?
}.should raise_error(Matrix::ErrDimensionMismatch)
end
end
end
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