How do i plot the biplot for the pca node? (principal component analysis)
We don't have a dedicated node for this.
If you are only looking for the 2dim plot, you need to calculate a PCA with the PCA node and afterwards you can use the Scatter plot of your choice.
If you need additional information, I would recommending using R for this, here is a nice package which will do the biplot https://stat.ethz.ch/R-manual/R-devel/library/stats/html/biplot.princomp.html