public function testIsZero() { $matrixData = [1.0, 2.0, 3.0, 4.0]; $matrix = Matrix::createColumnMatrix($matrixData); $this->assertFalse($matrix->isZero()); $matrixData2 = [0.0, 0.0, 0.0, 0.0]; $matrix2 = Matrix::createColumnMatrix($matrixData2); $this->assertTrue($matrix2->isZero()); }