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.

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

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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.



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