python-scipyHow do I create a dendrogram using Python and SciPy?

The dendrogram is a graphical representation of a hierarchical structure (e.g. a tree) that is commonly used to represent the relationships between data points in a dataset. It can be created using Python and SciPy with the following steps:

1. Import the necessary libraries:

import scipy.cluster.hierarchy as sch
from matplotlib import pyplot as plt

2. Create the data to be used in the dendrogram. For example, a 2x3 matrix:

data = [[2, 3, 4], [5, 6, 7]]

3. Use the SciPy library to generate the linkage matrix:

Z = sch.linkage(data, 'ward')

4. Generate the dendrogram using the linkage matrix:

dendrogram = sch.dendrogram(Z)

5. Plot the dendrogram:

plt.show()

The resulting dendrogram will look like this:

Helpful links

• SciPy Hierarchical Clustering and Dendrogram Tutorial
• Complete Guide to Hierarchical Clustering in Python

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