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Man Pages


Manual Reference Pages  -  BSPAR_ISOLVE (3)

NAME

BSpar_isolve - Solve a symmetric indefinite system of equations using symmlq preconditioned by one of several preconditioners.

CONTENTS

Input Parameters
Output Parameters
Returns
Notes
Synopsis
Location

INPUT PARAMETERS

A - a sparse matrix
fact_A
  - the incomplete factored version of A, if any (NULL if not exist)
comm_A
  - the communication structure for A
B - a sparse matrix
comm_B
  - the communication structure for B
in_rhs
  - the rhs
shift - the shift to multiply B by
pre_option
  - the preconditioner to use
PRE_ICC: incomplete Cholesky factorization of A
PRE_ILU: incomplete LU factorization of A
PRE_SSOR: Successive over relaxation (using just A)
PRE_BJACOBI: Block Jacobi (using just A)
residual
  - the final computed residual
procinfo
  - the usual processor stuff

OUTPUT PARAMETERS

out_x - the solution vector

RETURNS

The number of iterations.

NOTES

The system solved is (A-shift*B)out_x = in_rhs. The preconditioners must be computed prior to calling BSpar_isolve. For more information on the preconditioners, see the manual.

The following are now specified in the context:
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

SYNOPSIS

int BSpar_isolve(BSpar_mat *A, BSpar_mat *fact_A, BScomm *comm_A,
 BSpar_mat *B, BScomm *comm_B, FLOAT *in_rhs, FLOAT *out_x,
 FLOAT shift, FLOAT *residual, BSprocinfo *procinfo)

LOCATION

BlockSolve95/src/BSpar_isolve.c
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BSPAR_ISOLVE (3) 4/4/1996

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