

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
 
out_x  the contiguous block of vectors containing the solution
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.
The preconditioners must be computed prior to calling BSpar_isolve. For more information on the preconditioners, see the manual.
int BSpar_sym_solve(int BS, BSpar_mat *A, BSpar_mat *fact_A, BScomm *comm_A, FLOAT *in_rhs, FLOAT *out_x, int pre_option, FLOAT err_tol, int max_iter, FLOAT *residual, int guess, BSprocinfo *procinfo)
BlockSolve95/src/BSpar_sym_solve.c
BSPAR_SYM_SOLVE (3)  2/12/1996 
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