2018-03-04 10:09:32 -05:00
|
|
|
require_relative '../../spec_helper'
|
2017-05-07 08:04:49 -04:00
|
|
|
require 'matrix'
|
|
|
|
|
|
|
|
|
|
describe "Matrix.lower_triangular?" do
|
|
|
|
|
it "returns true for a square lower triangular Matrix" do
|
|
|
|
|
Matrix[[1, 0, 0], [1, 2, 0], [1, 2, 3]].lower_triangular?.should be_true
|
|
|
|
|
Matrix.diagonal([1, 2, 3]).lower_triangular?.should be_true
|
|
|
|
|
Matrix[[1, 0], [1, 2], [1, 2], [1, 2]].lower_triangular?.should be_true
|
|
|
|
|
Matrix[[1, 0, 0, 0], [1, 2, 0, 0]].lower_triangular?.should be_true
|
|
|
|
|
end
|
|
|
|
|
|
|
|
|
|
it "returns true for an empty Matrix" do
|
|
|
|
|
Matrix.empty(3, 0).lower_triangular?.should be_true
|
|
|
|
|
Matrix.empty(0, 3).lower_triangular?.should be_true
|
|
|
|
|
Matrix.empty(0, 0).lower_triangular?.should be_true
|
|
|
|
|
end
|
|
|
|
|
|
|
|
|
|
it "returns false for a non lower triangular square Matrix" do
|
|
|
|
|
Matrix[[0, 1], [0, 0]].lower_triangular?.should be_false
|
|
|
|
|
Matrix[[1, 2, 3], [1, 2, 3], [1, 2, 3]].lower_triangular?.should be_false
|
|
|
|
|
Matrix[[0, 1], [0, 0], [0, 0], [0, 0]].lower_triangular?.should be_false
|
|
|
|
|
Matrix[[0, 0, 0, 1], [0, 0, 0, 0]].lower_triangular?.should be_false
|
|
|
|
|
end
|
|
|
|
|
end
|
