This package enables you to create dendrograms and tree plots using
ggplot2::ggplot().
The ggplot2 philosophy is to clearly separate data from the presentation.
Unfortunately the plot method for dendrograms (plot.dendrogram()) plots
directly to a plot device without exposing the data. The ggdendro package
resolves this by making available functions that extract the dendrogram plot
data. This data can be used with ggplot.
The function dendro_data() extracts data from different objects that
contain dendrogram information. It is a generic function with methods for:
hclust: dendro_data.hclust()
dendrogram: dendro_data.dendrogram()
regression trees: dendro_data.tree()
partition trees: dendro_data.rpart()
agnes and diana: dendro_data.twins()
These methods create an object of class dendro, consisting of a list of
data frames. To extract the relevant data frames from the list, you can use
the accessor functions:
segment(): the line segment data
label(): the text for each end segment
leaf_label(): the leaf labels of a tree diagram
To plot a dendrogram, either construct a plot with ggplot2::ggplot() or use
the function ggdendrogram().