Assigning a different material to different objects

Hey,

I want to be able to change the material of a gameObject dependent on the value of starclass. I have 7 materials which have been placed into the Inspection slots for element[0-6].

I've established that I have to essentially create a new material of size 1 and re-assign the the appropriate element back into the inspector but I just can't seem to do it. Any ideas?

Code below....

using System.Collections; using System.Collections.Generic; using UnityEngine;

public class StarInfo : MonoBehaviour {

 public float starID;
 public string starclass;
 private string starcolor;
 public int startemp;
 private float randomintfloat;
 public GameObject star;
 public Material[] materials;
 public Renderer rend;


 public void Start()
 {
     rend = gameObject.GetComponent<Renderer> ();
     rend.enabled = true;

     Invoke("Classify", 0f);
 }

 public void Classify()
 {
     switch (starclass) 
     {
     case "O":
         Debug.Log ("Should change color to O");
         rend.materials = new Material[1];
         rend.material = classmaterial[1];
         //star.GetComponent<Renderer>().material.color = new Color(155, 176, 255);
         break;
     case "B":
         Debug.Log ("Should change color to B");
         rend.materials = new Material[1];
         rend.material = classmaterial[2];
         //star.GetComponent<Renderer>().material.color = new Color(170, 191, 255);
         break;

     case "A":
         Debug.Log ("Should change color to A");
         rend.materials = new Material[1];
         rend.material = classmaterial[3];
         //star.GetComponent<Renderer>().material.color = new Color(202, 215, 255);
         break;

     case "F":
         Debug.Log ("Should change color to F");
         rend.materials = new Material[1];
         rend.material = classmaterial[4];
         //star.GetComponent<Renderer>().material.color = new Color(248, 247, 255);
         break;

     case "G":
         Debug.Log ("Should change color to G");
         rend.materials = new Material[1];
         rend.material = classmaterial[5];
         //star.GetComponent<Renderer>().material.color = new Color(255, 244, 234);
         break;

     case "K":
         Debug.Log ("Should change color to K");
         rend.materials = new Material[1];
         rend.material = classmaterial[6];
         //star.GetComponent<Renderer>().material.color = new Color(255, 210, 161);
         break;

     case "M":
         Debug.Log ("Should change color to M");
         rend.materials = new Material[1];
         rend.material = classmaterial[6];

         //star.GetComponent<Renderer> ().material.color = new Color (255, 204, 111);
         break;

     }

     Debug.Log ("The clones have been classified and colored.");
 }

}