public function testTree3()
{
$deriver = new DerivationVisitor('x');
$evaluator = new EvaluationVisitor(['x' => 2]);
$f = Tree::mult(3, Tree::pow('x', 2))->add(Tree::mult(2, 'x'))->add(3);
$this->assertEquals(19, $evaluator->visit($f));
$this->assertEquals(14, $evaluator->visit($deriver->visit($f)));
}
public function testTreeRender2()
{
$deriver = new DerivationVisitor('x');
$simplfier = SimplifyVisitor::init();
$renderer = RenderStringVisitor::init();
$f = Tree::add(Tree::mult(3, 'x'), Tree::mult(2, 'x'), 3)->pow(2);
$this->assertEquals("(3 * x + 2 * x + 3) ^ 2", $renderer->visit($f));
$this->assertEquals('10 * (3 * x + 2 * x + 3)', $renderer->visit($simplfier->visit($deriver->visit($f))));
$this->assertEquals(50, $renderer->visit($simplfier->visit($deriver->visit($deriver->visit($f)))));
}
public function testAddNodeWithVariable()
{
$deriver = new DerivationVisitor('x');
$eval = new EvaluationVisitor(['x' => 3]);
$node = new BinaryMultiplicationNode(new ConstantNode(2), new VariableNode('x'));
$d = $deriver->visit($node);
$dd = $deriver->visit($d);
$this->assertEquals(6, $eval->visit($node));
$this->assertEquals(2, $eval->visit($d));
$this->assertEquals(0, $eval->visit($dd));
}
public function testPowerNodeWithVar()
{
$deriver = new DerivationVisitor('x');
$eval2 = new EvaluationVisitor(['x' => 2]);
$eval3 = new EvaluationVisitor(['x' => 3]);
$node = new PowerNode(new VariableNode('x'), new ConstantNode(3));
$d = $deriver->visit($node);
$this->assertEquals(12, $eval2->visit($d));
$this->assertEquals(8, $eval2->visit($node));
$this->assertEquals(27, $eval3->visit($d));
$this->assertEquals(27, $eval3->visit($node));
}
