Access the x, y, z components using [0], [1], [2] respectively.
var p : Vector3;
p[1] = 5; // the same as p.y = 5
using UnityEngine;
using System.Collections;
public class example : MonoBehaviour {
public Vector3 p;
void Example() {
p[1] = 5;
}
}
import UnityEngine
import System.Collections
class example(MonoBehaviour):
public p as Vector3
def Example():
p[1] = 5