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BSpar_gmres(3)			 BlockSolve95			BSpar_gmres(3)

NAME
       BSpar_gmres - Solve a nonsymmetric system of equations using gmres pre-
       conditioned by one of several preconditioners.  The rhs can be a	 block
       of vectors.

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 factor-
	      ization PRE_ILU: incomplete LU factorization  PRE_SSOR:  Succes-
	      sive over	relaxation PRE_BJACOBI:	Block Jacobi
       err_tol
	      -	 the tolerance to which	to solve the problem stop if the esti-
	      mated 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 as-
	      sumes 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
       iterations  prior to finding that the matrix (or	preconditioner)	is not
       positive	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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