Default color

The default color is applied to parts of a dendrogram that do not belong to any subtrees. By default, it is the first color of the colorway attribute of the layout attribute of a figure. This can be changed using the default_color parameter.

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, default_color="#000000")
pio.show(fig)