pub fn dendrogram_links(
merge: &[(i64, i64)],
heights: &[f64],
labels: &[&str],
) -> Vec<(String, Vec<Value>)>Expand description
Parent → child links for a dendrogram from an R hclust-style merge
matrix: row k merges a and b (negative = leaf -a, 1-based;
positive = the cluster formed at row a) at heights[k]. Returns
columns from, to and height (the parent’s merge height) ready for
geom_dendrogram; leaves are named by labels (1-based leaf i →
labels[i - 1]), clusters "#k".