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Man Pages


Manual Reference Pages  -  BSPAR_GMRES (3)

NAME

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

CONTENTS

Input Parameters
Output Parameters
Returns
Notes
Synopsis
Location

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 factorization 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 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
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BSPAR_GMRES (3) 12/25/1995

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