/* nag_dtrsyl (f08qhc) Example Program.
 *
 * Copyright 2001 Numerical Algorithms Group.
 *
 * Mark 7, 2001.
 */

#include <stdio.h>
#include <nag.h>
#include <nag_stdlib.h>
#include <nagf08.h>
#include <nagx04.h>

int main(void)
{
  /* Scalars */
  Integer  i, j, m, n, pda, pdb, pdc;
  Integer  exit_status=0;
  double   scale;
  NagError fail;
  Nag_OrderType order;
  /* Arrays */
  double *a=0, *b=0, *c=0;

#ifdef NAG_COLUMN_MAJOR
#define A(I,J) a[(J-1)*pda + I - 1]
#define B(I,J) b[(J-1)*pdb + I - 1]
#define C(I,J) c[(J-1)*pdc + I - 1]
  order = Nag_ColMajor;
#else
#define A(I,J) a[(I-1)*pda + J - 1]
#define B(I,J) b[(I-1)*pdb + J - 1]
#define C(I,J) c[(I-1)*pdc + J - 1]
  order = Nag_RowMajor;
#endif

  INIT_FAIL(fail);
  Vprintf("f08qhc Example Program Results\n\n");

  /* Skip heading in data file */
  Vscanf("%*[^\n] ");
  Vscanf("%ld%ld%*[^\n] ", &m, &n);
#ifdef NAG_COLUMN_MAJOR
  pda = m;
  pdb = n;
  pdc = m;
#else
  pda = m;
  pdb = n;
  pdc = n;
#endif

  /* Allocate memory */
  if ( !(a = NAG_ALLOC(m * m, double)) ||
       !(b = NAG_ALLOC(n * m, double)) ||
       !(c = NAG_ALLOC(m * n, double)) )
    {
      Vprintf("Allocation failure\n");
      exit_status = -1;
      goto END;
    }

  /* Read A, B and C from data file */
  for (i = 1; i <= m; ++i)
    {
      for (j = 1; j <= m; ++j)
        Vscanf("%lf", &A(i,j));
    }
  Vscanf("%*[^\n] ");
  for (i = 1; i <= n; ++i)
    {
      for (j = 1; j <= n; ++j)
        Vscanf("%lf", &B(i,j));
    }
  Vscanf("%*[^\n] ");
  for (i = 1; i <= m; ++i)
    {
      for (j = 1; j <= n; ++j)
        Vscanf("%lf", &C(i,j));
    }
  Vscanf("%*[^\n] ");

  /* Reorder the Schur factorization T */
  f08qhc(order, Nag_NoTrans, Nag_NoTrans, Nag_Plus, m, n, a, pda,
         b, pdb, c, pdc, &scale, &fail);
  if (fail.code != NE_NOERROR)
    {
      Vprintf("Error from f08qhc.\n%s\n", fail.message);
      exit_status = 1;
      goto END;
    }
  /* Print the solution matrix X stored in C */
  x04cac(order, Nag_GeneralMatrix, Nag_NonUnitDiag, m, n,
         c, pdc, "Solution matrix X", 0, &fail);
  if (fail.code != NE_NOERROR)
    {
      Vprintf("Error from x04cac.\n%s\n", fail.message);
      exit_status = 1;
      goto END;
    }
  Vprintf("\n SCALE = %10.2e\n", scale);
 END:
  if (a) NAG_FREE(a);
  if (b) NAG_FREE(b);
  if (c) NAG_FREE(c);

  return exit_status;
}