There are four packages in the ITPACK directory for solving large sparse linear systems by iterative methods: ITPACK 2C (single precision), ITPACK 2C (double precision), ITPACKV 2D (a vectorized version of ITPACK 2C for the Cray Y-MP and similar vector computers), and NSPCG. ITPACK 2C and ITPACKV 2D are intended for symmetric and positive-definite matrix problems. NSPCG has preconditioners and polynomial accelerators for nonsymmetric matrix problems as well. Only single precision versions are available for ITPACKV 2D and NSPCG. Machine-dependent constants and the timing function may need to be modified by the user when installing the packages for a particular computer. They are located in routines DFAULT and TIMER in all four packages.
Eric and Jack
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