Matrix.utils            Data.frame-Like Operations on Sparse and Dense
                        'Matrix' Objects
aggregate.Matrix        Compute summary statistics of a Matrix
dMcast                  Casts or pivots a long 'data frame' into a wide
                        sparse matrix
merge.Matrix            Merges two Matrices or matrix-like objects
rBind.fill              Combine matrixes by row, fill in missing
                        columns
