Performs Ward’s linkage on a condensed distance matrix.
See linkage for more information on the return structure and algorithm.
The following are common calling conventions:
- Z = ward(y) Performs Ward’s linkage on the condensed distance matrix y.
- Z = ward(X) Performs Ward’s linkage on the observation matrix X using Euclidean distance as the distance metric.
y : ndarray
A condensed distance matrix. A condensed distance matrix is a flat array containing the upper triangular of the distance matrix. This is the form that pdist returns. Alternatively, a collection of m observation vectors in n dimensions may be passed as a m by n array.
Z : ndarray
The hierarchical clustering encoded as a linkage matrix. See linkage for more information on the return structure and algorithm.