How to specify linewidth in Seaborn's clustermap dendrograms

Question

Normally I would increase matplotlib\'s global linewidths by editing the matplotlib.rcParams. This seems to work well directly with SciPy\'s dendrogram implementation but not wi

Answer 1

There may be an easier way to do it, but this seems to work:

import matplotlib
import seaborn as sns; sns.set()

flights = sns.load_dataset("flights")
flights = flights.pivot("month", "year", "passengers")
g = sns.clustermap(flights)
for l in g.ax_row_dendrogram.lines:
        l.set_linewidth(10)
for l in g.ax_col_dendrogram.lines:
        l.set_linewidth(10)

Edit This no longer works in Seaborn v. 0.7.1 (and probably some earlier versions as well); g.ax_col_dendrogram.lines now returns an empty list. I couldn't find a way to increase line width and I ended up temporarily modifying the Seaborn module. In file matrix.py, function class _DendrogramPlotter, the linewidth is hard-coded as 0.5; I modified it to 1.5:

line_kwargs = dict(linewidths=1.5, colors='k')

This worked but obviously isn't a very sustainable approach.