gr.hclust               Hierarchical Agglomerative Clustering on
                        Grassmann Manifold
gr.kmedoids             k-Medoids Clustering on Grassmann Manifold
gr.mean                 Frchet Mean on Grassmann Manifold
gr.pdist                Pairwise Distance for Data on Grassmann
                        Manifold
gr.pdist2               Pairwise Distance for Two Sets Data on
                        Grassmann Manifold
package-RiemGrassmann   Inference, Learning, and Optimization on
                        Grassmann Manifold
