[Solved] What is wrong with this code snippet?from scipy.cluster.hierarchy import dendrogram Z = [[0, 1, 0.5, 2], [1, 2, 0.7, 2]] dn = dendrogram(Z) | SciPy

SciPy - Clustering and Distance

What is wrong with this code snippet?

from scipy.cluster.hierarchy import dendrogram
Z = [[0, 1, 0.5, 2], [1, 2, 0.7, 2]]
dn = dendrogram(Z)

AZ is not a valid linkage matrix

BMissing import of matplotlib.pyplot

Cdendrogram requires a distance matrix, not linkage

DZ must be a numpy array, not a list

Step-by-Step Solution

Solution:

Step 1: Check linkage matrix format
Z must be a valid linkage matrix with correct shape and values.
Step 2: Identify issue with Z
Z is a list but may not represent a valid linkage matrix (e.g., distances or cluster indices incorrect).
Final Answer:
Z is not a valid linkage matrix -> Option A
Quick Check:
Linkage matrix must be valid for dendrogram [OK]

Quick Trick: Linkage matrix must be valid and correctly formatted [OK]

Common Mistakes:

Master "Clustering and Distance" in SciPy

9 interactive learning modes - each teaches the same concept differently

More SciPy Quizzes

What is wrong with this code snippet?