Nothing
\dontrun{
# classical multidimensional scaling of road distances between European cities
euro_mds <- ordinate(eurodist, cmdscale_ord, k = 11)
# biplot with minimal spanning tree based on full-dimensional distances
# (as implemented in {mlpack})
euro_mds %>%
negate_ord("PCo2") %>%
ggbiplot() +
stat_cols_spantree(
ord_aes(euro_mds), engine = "mlpack",
alpha = .5, linetype = "dotted"
) +
geom_cols_text(aes(label = name), size = 3) +
ggtitle(
"MDS biplot of road distances between European cities",
"Dotted segments constitute the minimal spanning tree"
)
}
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