Dendrogram layout

Positions a merge tree (from as_graph() applied to an hclust or dendrogram object) using node heights as the depth axis. Leaf order follows the original merge sides, so label ordering matches the cluster analysis output.

Usage

layout_dendrogram(plot, direction = c("down", "up", "left", "right"))

Arguments

plot

A plotit object holding graph data, or a bare plotit_graph.

direction

Direction the tree grows: "down" (root on top), "up", "right", or "left".

Value

A modified plotit object (pipeline form), or a new plotit_graph when called on raw graph data.

Examples

hc <- hclust(dist(USArrests[1:6, ]))
g <- as_graph(hc) |> layout_dendrogram()
head(g$nodes)
#>           id leaf height x y
#> 1    Alabama TRUE      0 5 0
#> 2     Alaska TRUE      0 6 0
#> 3    Arizona TRUE      0 3 0
#> 4   Arkansas TRUE      0 1 0
#> 5 California TRUE      0 4 0
#> 6   Colorado TRUE      0 2 0

as_graph(hc) |>
  plotit() |>
  layout_dendrogram(direction = "down") |>
  mark_rule(data = ~edges) |>
  mark_point(data = ~nodes)