How to use kruskal-wallis test for a vector?

Hello, I have a row of variance var=[0.1 0.02 0.1 0.4 0.1 0.2 0.04 0.01] and their labels L=[2 1 4 3 3 1 2 2]. For kruskal-wallis test, can I use only the variance without labels? I saw the help of this function in matlab but I did not understand if I have to use labels or not? I mean is it possible to use kruskal-wallis test for only one vector without label?