**Iterative methods**- CG, SYMMLQ, GMRES are provided, though these are not the main focus of package; BlockSolve can be interfaced to Petsc for more iterative methods.
**Preconditioners**- diagonal scaling, block Jacobi with blocks corresponding to the cliques factored out of the quotient graph, incomplete LU and Cholesky.
**Data structures**- Internal, as a C structure..
**Access operations on the data structure**- None; the definition of the structure is given in the manual.
**Operations using the data structure**- Iterative solution of the system and of a shifted system,
application of the matrix and the preconditioner.

**Manual**- Users Manual; 34 pages. This is a complete reference; the user is suggested to use the example codes as templates for applications.
**Example codes**- Yes

Mon Aug 25 17:46:10 PDT 1997