A set of n columns, where n is also the number of rows. These n columns define a symmetric matrix with zero or missing values on the diagonal.
Notice that the distance matrix in Flight Distances.jmp follows the preceding format.
Select Help > Sample Data Library and open Flight Distances.jmp.
Select Analyze > Clustering > Hierarchical Cluster.
In the list at the bottom left corner of the launch window, change Data as usual to Data is distance matrix.
Select Cities and click Label.
Completed Distance Matrix Launch Window
Dendrogram Report for Flight Distances
Dendrogram Report for Flight Distances shows the Dendrogram report for the flight distances. The placement of the diamonds indicates that the model has grouped the cities into three clusters, which are color-coded on the dendrogram. For more details about how to interpret the report, see Dendrogram Report.

Help created on 9/19/2017