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