Barry,
Thank you for an interesting response. > For algorithms that require dealing with the sparsity structure of > the matrix we generally just include the appropriate private include file > for the matrix format and access the data directly in the underlying format. Can you please elaborate. What do you mean by "the appropriate privat include file for the matrix"? Sorry, I got lost there. Best, Toby ----- Toby D. Young (Adiunkt) Department of Computational Science Institute of Fundamental Technological Research Polish Academy of Science Room 206, ul. Swietokrzyska 21 00-049 Warszawa, POLAND