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Man Pages


Manual Reference Pages  -  BSPAR_SOLVE (3)

NAME

BSpar_solve - General solver of a system of equations preconditioned by one of several preconditioners and using one of several possible methods. The rhs can be a block of vectors.

CONTENTS

Input Parameters
Output Parameters
Now Specified In Procinfo Context
Returns
Notes
Synopsis
Location

INPUT PARAMETERS

A - a sparse matrix
fact_A
  - the incomplete factored version of A, if any
comm_A
  - the communication structure for A
rhs - the contiguous block of vectors forming the rhs
residual
  - the final computed residual

OUTPUT PARAMETERS

x - the contiguous block of vectors containing the solution (can contain an initial guess if BSctx_set_guess() is set.

NOW SPECIFIED IN PROCINFO CONTEXT

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
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

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_solve. For more information on the preconditioners, see the manual or BSctx_set_pre().

SYNOPSIS

int BSpar_solve(BSpar_mat *A, BSpar_mat *fact_A, BScomm *comm_A,
 FLOAT *rhs, FLOAT *x, FLOAT *residual, BSprocinfo *procinfo)

LOCATION

BlockSolve95/src/BSpar_solve.c
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BSPAR_SOLVE (3) 1/10/1996

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