BSpar_gmres(3) BlockSolve95 BSpar_gmres(3) NAME BSpar_gmres - Solve a nonsymmetric system of equations using gmres precon- ditioned by one of several preconditioners. The rhs can be a block of vec- tors. INPUT PARAMETERS BS - the number of vectors in the RHS A - a sparse matrix fact_A - the incomplete factored version of A, if any comm_A - the communication structure for A in_rhs - the contiguous block of vectors forming the rhs pre_option - the preconditioner to use PRE_ICC: incomplete Cholesky factoriza- tion PRE_ILU: incomplete LU factorization PRE_SSOR: Successive over relaxation PRE_BJACOBI: Block Jacobi err_tol - the tolerance to which to solve the problem stop if the estimated norm of the residual divided by the norm of the rhs is less than err_tol max_iter - the maximum number of iterations to take residual - the final computed residual guess - if TRUE, then initialize out_x to 0, otherwise the program assumes that out_x contains an initial guess procinfo - the usual processor stuff OUTPUT PARAMETERS out_x - the contiguous block of vectors containing the solution RETURNS The number of iterations or a negative number indicating the number of it- erations prior to finding that the matrix (or preconditioner) is not posi- tive definite. NOTES The preconditioners must be computed prior to calling BSpar_isolve. For more information on the preconditioners, see the manual. SYNOPSIS int BSpar_gmres(int BS, BSpar_mat *A, BSpar_mat *fact_A, BScomm *comm_A, FLOAT *in_rhs, FLOAT *out_x, int pre_option, int restart, FLOAT err_tol, int max_iter, FLOAT *residual, int guess, BSprocinfo *procinfo) LOCATION BlockSolve95/src/BSpar_gmres.c 12/25/1995 BSpar_gmres(3)
NAME | INPUT PARAMETERS | OUTPUT PARAMETERS | RETURNS | NOTES | SYNOPSIS | LOCATION
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