public function testBoolean()
 {
     $matrixDataBoolean = [[true, false], [false, true]];
     $matrixDataDouble = [[1.0, -1.0], [-1.0, 1.0]];
     $matrixBoolean = Matrix::matrixFromBooleans($matrixDataBoolean);
     $matrixDouble = Matrix::matrixFromDoubles($matrixDataDouble);
     $this->assertTrue($matrixBoolean->equals($matrixDouble));
 }