GMRES/FGMRES
GMRES is an algorithm for solving linear system iteratively. The GMRES software here is implemented in Fortran 77 for real and complex, single and double precision arithmetics suitable for serial, shared memory and distributed memory computers. For the sake of simplicity, flexibility and efficiency, the GMRES solvers have been implemented using the reverse communication mechanism for the matrix-vector product, the preconditioning and the dot product computations. FGMRES is a variant of the GMRES method with right preconditioning that enables the use of a different preconditioner at each step of the Arnoldi process. In particular, a few steps of GMRES can be used as a preconditioner for FGMRES.
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License Type: Free for Non-Commercial Use, Registration Required
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