# Labeling KPCA in R

The function $$\texttt{biplot}$$ in R is very useful for creating visualizations when performing PCA. However, when performing kernel PCA in R, I cannot find a way to label the loadings on the graph. Here is an example below.

The loading vectors are clearly labeld. In KPCA, I get an output that looks something like this.

As you can see, there are no labels whatsoever on the graph. Is there a way to add labels? I am using $$\texttt{plot(kpc@pvc)}$$ to plot the data.

Thanks!