Subtree colorway

By default, subtrees are colored using the colorway attribute of the layout attribute of a figure. The color of an individual subtree is determined automatically. The colorway can be changed using the subtree_colorway parameter without changing the figure attribute.

import plotly.graph_objects as go
import plotly.io as pio
import scipy

from pdendro import attach_dendrogram

X = [[0.0], [1.0], [3.0], [6.0]]
Z = scipy.cluster.hierarchy.linkage(X)

fig = go.Figure()
attach_dendrogram(fig, Z, subtrees={2, 4}, subtree_colorway=["#ff0000", "#00ff00", "#0000ff"])
pio.show(fig)

If there are fewer colors than subtrees, the same color is used for different subtrees.

fig = go.Figure()
attach_dendrogram(fig, Z, subtrees={2, 4}, subtree_colorway=["#ff0000"])
pio.show(fig)