tgs_cor                 Calculates correlation or auto-correlation
tgs_dist                Calculates distances between the matrix rows
tgs_finite              Checks whether all the elements of the vector
                        are finite
tgs_graph               Builds directed graph of correlations
tgs_graph_cover         Clusters directed graph
tgs_graph_cover_resample
                        Clusters directed graph multiple times with
                        randomized sample subset
tgs_knn                 Returns k highest values of each column
tgs_matrix_tapply       For each matrix row apply a function over a
                        ragged array
