/* nag_sparse_nherm_jacobi (f11dxc) Example Program.
 *
 * Copyright 2014 Numerical Algorithms Group.
 *
 * Mark 23, 2011.
 */
#include <nag.h>
#include <nag_stdlib.h>
#include <naga02.h>
#include <nagf11.h>
int main(void)
{
  /* Scalars */
  Integer                 exit_status = 0;
  double                  anorm, sigmax, stplhs, stprhs, tol;
  Integer                 i, irevcm, iterm, itn, lwork, lwreq, m, maxitn,
                          monit, n, niter, nnz;
  /* Arrays */
  char                    nag_enum_arg[100];
  Complex                 *a = 0, *b = 0, *diag = 0, *work = 0, *x = 0;
  double                  *wgt = 0;
  Integer                 *icol = 0, *irow = 0;
  /* NAG types */
  Nag_InitializeA         init;
  Nag_SparseNsym_Method   method;
  Nag_SparseNsym_PrecType precon;
  Nag_NormType            norm;
  Nag_SparseNsym_Weight   weight;
  NagError                fail, fail1;

  INIT_FAIL(fail);
  INIT_FAIL(fail1);

  printf("nag_sparse_nherm_jacobi (f11dxc) Example Program Results\n");
  /* Skip heading in data file*/
  scanf("%*[^\n]");
  scanf("%ld%*[^\n]", &n);
  scanf("%ld%*[^\n]", &nnz);
  lwork = 300;
  if (
      !(a = NAG_ALLOC(nnz, Complex)) ||
      !(b = NAG_ALLOC(n, Complex)) ||
      !(diag = NAG_ALLOC(n, Complex)) ||
      !(work = NAG_ALLOC(lwork, Complex)) ||
      !(x = NAG_ALLOC(n, Complex)) ||
      !(wgt = NAG_ALLOC(n, double)) ||
      !(icol = NAG_ALLOC(nnz, Integer)) ||
      !(irow = NAG_ALLOC(nnz, Integer))
      ) {
      printf("Allocation failure\n");
      exit_status = -1;
      goto END;
    }
  /* Read or initialize the parameters for the iterative solver*/
  scanf("%99s%*[^\n]", nag_enum_arg);
  /* nag_enum_name_to_value (x04nac).
   * Converts NAG enum member name to value
   */
  method = (Nag_SparseNsym_Method) nag_enum_name_to_value(nag_enum_arg);
  scanf("%99s%*[^\n]", nag_enum_arg);
  precon = (Nag_SparseNsym_PrecType) nag_enum_name_to_value(nag_enum_arg);
  scanf("%99s%*[^\n]", nag_enum_arg);
  norm = (Nag_NormType) nag_enum_name_to_value(nag_enum_arg);
  scanf("%99s%*[^\n]", nag_enum_arg);
  weight = (Nag_SparseNsym_Weight) nag_enum_name_to_value(nag_enum_arg);
  scanf("%ld%*[^\n]", &iterm);
  scanf("%ld%lf%ld%*[^\n]", &m, &tol, &maxitn);
  scanf("%ld%*[^\n]", &monit);
  /* Read the parameters for the preconditioner*/
  scanf("%ld%*[^\n]", &niter);
  anorm = 0.0;
  sigmax = 0.0;

  /* Read the non-zero elements of the matrix A*/
  for (i = 0; i < nnz; i++)
    scanf(" ( %lf , %lf ) %ld%ld%*[^\n]", &a[i].re, &a[i].im,
          &irow[i], &icol[i]);
  /* Read right-hand side vector b and initial approximate solution*/
  for (i = 0; i < n; i++) scanf(" ( %lf , %lf )", &b[i].re, &b[i].im);
  scanf("%*[^\n]");
  for (i = 0; i < n; i++) scanf(" ( %lf , %lf )", &x[i].re, &x[i].im);
  scanf("%*[^\n]");

  /* Call to initialize the solver */
  /* nag_sparse_nherm_basic_setup (f11brc).
   * Complex sparse non-Hermitian linear systems, setup
   */
  nag_sparse_nherm_basic_setup(method, precon, norm, weight, iterm, n, m, tol,
                               maxitn, anorm, sigmax, monit, &lwreq, work,
                               lwork, &fail);
  if (fail.code != NE_NOERROR) {
    printf("Error from nag_sparse_nherm_basic_setup (f11brc).\n%s\n",
           fail.message);
    exit_status = 1;
    goto END;
  }
  /* Call solver repeatedly to solve the equations.
   * Note: the arrays b and x are overwritten; on final exit, x will
   *       contain the solution and b the residual vector.
   */
  irevcm = 0;
  init =Nag_InitializeI;
  while (irevcm != 4) {
    /* nag_sparse_nherm_basic_solver (f11bsc)
     * Complex sparse non-Hermitian linear systems, preconditioned RGMRES, CGS,
     * Bi-CGSTAB or TFQMR method
     */
    nag_sparse_nherm_basic_solver(&irevcm, x, b, wgt, work, lwreq, &fail);
    switch (irevcm) {
    case -1:
      /* nag_sparse_nherm_matvec (f11xnc)
       * Complex sparse non-Hermitian matrix vector multiply
       */
      nag_sparse_nherm_matvec(Nag_ConjTrans, n, nnz, a, irow, icol,
                              Nag_SparseNsym_NoCheck, x, b, &fail1);
      break;
    case 1:
      nag_sparse_nherm_matvec(Nag_NoTrans, n, nnz, a, irow, icol,
                              Nag_SparseNsym_NoCheck, x, b, &fail1);
      break;
    case 2:
      /* nag_sparse_nherm_jacobi (f11dxc).
       * Complex sparse nonsymmetric linear systems, line Jacobi preconditioner
       */
      nag_sparse_nherm_jacobi(Nag_SparseNsym_StoreCS, Nag_NoTrans, init,
                              niter, n, nnz, a, irow, icol,
                              Nag_SparseNsym_Check, x, b, diag, &fail1);
      init = Nag_InputA;
      break;
    case 3:
      /* nag_sparse_nherm_basic_diagnostic (f11btc)
       * Complex sparse nonhermitian linear systems, diagnostic
       */
      nag_sparse_nherm_basic_diagnostic(&itn, &stplhs, &stprhs, &anorm, 
                                        &sigmax, work, lwreq,&fail1);
      if (fail1.code == NE_NOERROR)
        printf("Monitoring at iteration no.%4ld residual %14.4e\n",
               itn, stplhs);
    }
    if (fail1.code != NE_NOERROR) irevcm = 6;
  }
  if (fail.code != NE_NOERROR)
    {
      printf("Error from nag_sparse_nherm_basic_solver (f11bsc)\n%s\n",
             fail.message);
      exit_status = 2;
      goto END;
    }
  /* Obtain information about the computation using 
   * nag_sparse_nherm_basic_diagnostic (f11btc).
   * Complex sparse Hermitian linear systems, diagnostic.
   */
  nag_sparse_nherm_basic_diagnostic(&itn, &stplhs, &stprhs, &anorm, &sigmax, 
                                    work, lwreq, &fail);
  if (fail.code != NE_NOERROR)
    {
      printf("Error from nag_sparse_nherm_basic_diagnostic (f11btc)\n%s\n",
             fail.message);
      exit_status = 3;
      goto END;
    }
  /* Print the output data*/
  printf("\nFinal Results\n");
  printf("Number of iterations for convergence:     %4ld \n", itn);
  printf("Residual norm:                            %14.4e \n", stplhs);
  printf("Right-hand side of termination criterion: %14.4e\n", stprhs);
  printf("1-norm of matrix A:                       %14.4e\n", anorm);
  /* Output x*/
  printf("\n%20s%29s\n","Solution vector","Residual vector");
  for (i = 0; i < n; i++)
    printf("(%13.4e, %13.4e)   (%13.4e, %13.4e)\n", x[i].re, x[i].im, b[i].re,
           b[i].im);
 END:
  NAG_FREE(a);
  NAG_FREE(b);
  NAG_FREE(diag);
  NAG_FREE(work);
  NAG_FREE(x);
  NAG_FREE(wgt);
  NAG_FREE(icol);
  NAG_FREE(irow);
  return exit_status;
}