MathPHP\Functions\SpecialTest::dataProviderForSignum PHP Метод

    public function dataProviderForSignum()
    {
        return [[0, 0], [1, 1], [0.5, 1], [1.5, 1], [4, 1], [123241.342, 1], [-1, -1], [-0.5, -1], [-1.5, -1], [-4, -1], [-123241.342, -1]];
    }