This function uses the following arguments for output:
x - Upon successful completion, x contains the converged solution. If the computation breaks down or diverges, x will contain the solution produced by the most recent iteration.
iparm[S3L_iter_maxiter] - On output, contains the total number of iterations taken by the solver at the time of termination.
rparm[S3L_iter_tol] - On output, contains the computed error, err, according to the convergence criteria. See the iparm[S3L_iter_conv] description for details..
ier (Fortran only) - When called from a Fortran program, this function returns error status in ier.