The dtCMatrix class is a class of triangular, sparse
matrices in the compressed, column-oriented format. In this
implementation the non-zero elements in the columns are sorted into
increasing row order. The dtTMatrix class is a class of
triangular, sparse matrices in triplet format.
Arguments
Objects from the Class
Objects can be created by calls of the form new("dtCMatrix",
...) or calls of the form new("dtTMatrix", ...).