/* nag_zpocon (f07fuc) Example Program.
 *
 * Copyright 2001 Numerical Algorithms Group.
 *
 * Mark 7, 2001.
 */

#include <stdio.h>
#include <nag.h>
#include <nag_stdlib.h>
#include <naga02.h>
#include <nagf07.h>
#include <nagf16.h>
#include <nagx02.h>

int main(void)
{
  /* Scalars */
  double   anorm, rcond;
  Integer  i, j, n, pda;
  Integer  exit_status=0;
  Nag_UploType uplo_enum;
  NagError fail;
  Nag_OrderType order;
  /* Arrays */
  char    uplo[2];
  Complex *a=0;

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

  INIT_FAIL(fail);
  Vprintf("f07fuc Example Program Results\n\n");

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

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

  /* Read A from data file */
  Vscanf(" ' %1s '%*[^\n] ", uplo);
  if (*(unsigned char *)uplo == 'L')
    uplo_enum = Nag_Lower;
 else if (*(unsigned char *)uplo == 'U')
   uplo_enum = Nag_Upper;
 else
   {
     Vprintf("Unrecognised character for Nag_UploType type\n");
      exit_status = -1;
      goto END;
   }

  if (uplo_enum == Nag_Upper)
    {
      for (i = 1; i <= n; ++i)
        {
          for (j = i; j <= n; ++j)
            Vscanf(" ( %lf , %lf )", &A(i,j).re, &A(i,j).im);
        }
      Vscanf("%*[^\n] ");
    }
  else
    {
      for (i = 1; i <= n; ++i)
        {
          for (j = 1; j <= i; ++j)
            Vscanf(" ( %lf , %lf )", &A(i,j).re, &A(i,j).im);
        }
      Vscanf("%*[^\n] ");
    }

  /* Compute norm of A */
  f16ucc(order, Nag_OneNorm, uplo_enum, n, a, pda, &anorm, &fail);
  if (fail.code != NE_NOERROR)
    {
      Vprintf("Error from f16ucc.\n%s\n", fail.message);
      exit_status = 1;
      goto END;
    }

  /* Factorize A */

  f07frc(order, uplo_enum, n, a, pda, &fail);
  if (fail.code != NE_NOERROR)
    {
      Vprintf("Error from f07frc.\n%s\n", fail.message);
      exit_status = 1;
      goto END;
    }
  /* Estimate condition number */
  f07fuc(order, uplo_enum, n, a, pda, anorm, &rcond, &fail);
  if (fail.code != NE_NOERROR)
    {
      Vprintf("Error from f07fuc.\n%s\n", fail.message);
      exit_status = 1;
      goto END;
    }
  if (rcond >= X02AJC)
    Vprintf("Estimate of condition number =%10.2e\n", 1.0/rcond);
  else
    Vprintf("A is singular to working precision\n");
END:
  if (a) NAG_FREE(a);
  return exit_status;
}