/* nag_superlu_lu_factorize (f11mec) Example Program.
 *
 * Copyright 2005 Numerical Algorithms Group.
 *
 * Mark 8, 2005.
 */

#include <stdio.h>
#include <nag.h>
#include <nagx04.h>
#include <nag_stdlib.h>
#include <nagf11.h>

/* Table of constant values */

int main(void)
{
  double                    flop, thresh;
  Integer                   exit_status = 0, i, n, nnz, nnzl, nnzu, nzlmx,
                            nzlumx, nzumx;
  double                    *a = 0, *lval = 0, *uval = 0;
  Integer                   *icolzp = 0, *il = 0, *iprm = 0, *irowix = 0;
  Integer                   *iu = 0;
  /* Nag types */
  NagError                  fail;
  Nag_ColumnPermutationType ispec;
  Nag_OrderType             order = Nag_ColMajor;
  Nag_MatrixType            matrix = Nag_GeneralMatrix;
  Nag_DiagType              diag = Nag_NonUnitDiag;


  INIT_FAIL(fail);

  /* nag_superlu_lu_factorize (f11mec).
   * LU factorization of real sparse matrix
   */
  printf(
          "nag_superlu_lu_factorize (f11mec) Example Program Results\n\n");
  /* Skip heading in data file */
  scanf("%*[^\n] ");
  /* Read order of matrix */
  scanf("%ld%*[^\n] ", &n);
  /* Read the matrix A */
  /* Allocate memory */
  if (!(icolzp = NAG_ALLOC(n+1, Integer)))
    {
      printf("Allocation failure\n");
      exit_status = -1;
      goto END;
    }
  for (i = 1; i <= n+1; ++i) scanf("%ld%*[^\n] ", &icolzp[i - 1]);
  nnz = icolzp[n] - 1;
  /* Allocate memory */
  if (!(irowix = NAG_ALLOC(nnz, Integer)) ||
      !(a = NAG_ALLOC(nnz, double)) ||
      !(il = NAG_ALLOC(7*n+8*nnz+4, Integer)) ||
      !(iu = NAG_ALLOC(2*n+8*nnz+1, Integer)) ||
      !(uval = NAG_ALLOC(8*nnz, double)) ||
      !(lval = NAG_ALLOC(8*nnz, double)) ||
      !(iprm = NAG_ALLOC(7*n, Integer)))
    {
      printf("Allocation failure\n");
      exit_status = -1;
      goto END;
    }
  for (i = 1; i <= nnz; ++i)
    scanf("%lf%ld%*[^\n] ", &a[i - 1], &irowix[i - 1]);
  /* Calculate COLAMD permutation */
  ispec = Nag_Sparse_Colamd;
  /* nag_superlu_column_permutation (f11mdc).
   * Real sparse nonsymmetric linear systems, setup for
   * nag_superlu_lu_factorize (f11mec)
   */
  nag_superlu_column_permutation(ispec, n, icolzp, irowix, iprm, &fail);
  if (fail.code != NE_NOERROR)
    {
      printf(
              "Error from nag_superlu_column_permutation (f11mdc).\n%s\n",
              fail.message);
      exit_status = 1;
      goto END;
    }
  /* Factorise */
  thresh = 1.;
  nzlmx = 8*nnz;
  nzlumx = 8*nnz;
  nzumx = 8*nnz;
  /* nag_superlu_lu_factorize (f11mec), see above. */
  nag_superlu_lu_factorize(n, irowix, a, iprm, thresh, nzlmx, &nzlumx, nzumx,
                           il, lval, iu, uval, &nnzl, &nnzu, &flop, &fail);
  if (fail.code != NE_NOERROR)
    {
      printf("Error from nag_superlu_lu_factorize (f11mec).\n%s\n",
              fail.message);
      exit_status = 1;
      goto END;
    }


  /* Output results */
  printf("\n");
  printf("Number of nonzeros in factors (excluding unit diagonal)\n");
  printf("%8ld\n\n", nnzl + nnzu - n);
  /* nag_gen_real_mat_print_comp (x04cbc).
   * Print real general matrix (comprehensive)
   */
  fflush(stdout);
  nag_gen_real_mat_print_comp(order, matrix, diag, 1, 10, lval, 1, "%6.2f",
                              "Factor elements in LVAL", Nag_NoLabels, NULL,
                              Nag_NoLabels, NULL, 80, 1, 0, &fail);
  if (fail.code != NE_NOERROR)
    {
      printf("Error from nag_gen_real_mat_print_comp (x04cbc).\n%s\n",
              fail.message);
      exit_status = 1;
      goto END;
    }

  printf("\n");
  /* nag_gen_real_mat_print_comp (x04cbc), see above. */
  fflush(stdout);
  nag_gen_real_mat_print_comp(order, matrix, diag, 1, 4, uval, 1, "%6.2f",
                              "Factor elements in LVAL", Nag_NoLabels, NULL,
                              Nag_NoLabels, NULL, 80, 1, 0, &fail);
  if (fail.code != NE_NOERROR)
    {
      printf("Error from nag_gen_real_mat_print_comp (x04cbc).\n%s\n",
              fail.message);
      exit_status = 1;
      goto END;
    }

 END:
  if (a) NAG_FREE(a);
  if (lval) NAG_FREE(lval);
  if (uval) NAG_FREE(uval);
  if (icolzp) NAG_FREE(icolzp);
  if (il) NAG_FREE(il);
  if (iprm) NAG_FREE(iprm);
  if (irowix) NAG_FREE(irowix);
  if (iu) NAG_FREE(iu);

  return exit_status;
}