I'm new to R. I have the following data table:

```
22  1045    4   166.834
23  1047    2   131.567
26  1054    2   43.583
28  1057    2   280.184
34  1064    1   134.608
44  1081    1   70.862
47  1086    2   27.156
50  1094    2   259.189
51  1096    4   216.103
56  1109    2   429.679
59  1115    1   76.770

```

The table is already grouped by the third column. What I'm tyring to do is to plot a Matrix which shows that there are 3 Cluster for example (1,2-3,4). Is there an easy way to do it?

Thanks in advance