Question Cant figure out why this (simple?) movement code does not work? (Ruby's Adventure 2D tutorial)

Hey, when implement the following code to my script, my character freezes:

Code (CSharp):

1. using System.Collections;
2. using System.Collections.Generic;
3. using UnityEngine;
4.  
5. public class RubyController : MonoBehaviour
6. {
7.     public Rigidbody2D rb2d;
8.     float horizontal;
9.     float vertical;
10.     public float speed = 5f;
11.  
12.     private void Start()
13.     {
14.         rb2d = GetComponent<Rigidbody2D>();
15.     }
16.  
17.     private void Update()
18.     {
19.         horizontal = Input.GetAxis("Horizontal");
20.         vertical = Input.GetAxis("Vertical");
21.     }
22.  
23.     private void FixedUpdate()
24.     {
25.         Vector2 position = this.rb2d.position;
26.         position.x = position.x * speed * horizontal * Time.deltaTime;
27.         position.y = position.y * speed * vertical * Time.deltaTime;
28.  
29.         rb2d.MovePosition(position);
30.     }
31. }

but if I type in this it works:

Code (CSharp):

1. public Rigidbody2D rigidbody2d;
2. public float speed = 5.0f;
3. Vector2 movement;
4.  
5. void Start()
6. {
7.     rigidbody2d = GetComponent<Rigidbody2D>();
8. }
9.  
10. void Update()
11. {
12.     movement.x = Input.GetAxis("Horizontal");
13.     movement.y = Input.GetAxis("Vertical");
14. }
15.  
16. private void FixedUpdate()
17. {
18.     rigidbody2d.MovePosition(rigidbody2d.position + movement * speed * Time.deltaTime);
19. }
20.  

Im very curious why?

 

Solved!

 

So people know how you solved it.

Code (CSharp):

1. position.x = position.x + horizontal * speed * Time.deltaTime;
2. position.y = position.y + vertical * speed * Time.deltaTime;

You have to add the input values, not multiply them.