num_obs_linkage — SciPy v1.15.2 Manual (original) (raw)

scipy.cluster.hierarchy.

scipy.cluster.hierarchy.num_obs_linkage(Z)[source]#

Return the number of original observations of the linkage matrix passed.

Parameters:

Zndarray

The linkage matrix on which to perform the operation.

Returns:

nint

The number of original observations in the linkage.

Examples

from scipy.cluster.hierarchy import ward, num_obs_linkage from scipy.spatial.distance import pdist

X = [[0, 0], [0, 1], [1, 0], ... [0, 4], [0, 3], [1, 4], ... [4, 0], [3, 0], [4, 1], ... [4, 4], [3, 4], [4, 3]]

Z is a linkage matrix obtained after using the Ward clustering method with X, a dataset with 12 data points.

num_obs_linkage(Z) 12