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Man Pages
BSpar_isolve(3) BlockSolve95 BSpar_isolve(3)

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

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

out_x
- the solution vector

The number of iterations.

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

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)

BlockSolve95/src/BSpar_isolve.c
4/4/1996

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