/* nag_dgemm (f16yac) Example Program.
 *
 * Copyright 2005 Numerical Algorithms Group.
 *
 * Mark 8, 2005.
 */

#include <stdio.h>
#include <nag.h>
#include <nag_stdlib.h>
#include <nagf16.h>
#include <nagx04.h>

int main(void)
{

  /* Scalars */
  double alpha, beta;
  Integer exit_status, i, j, k, m, n, pda, pdb, pdc;

  /* Arrays */
  double *a=0, *b=0, *c=0;
  char nag_enum_arg[40];

  /* Nag Types */
  NagError fail;
  Nag_OrderType order;
  Nag_TransType transa;
  Nag_TransType transb;

#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

  exit_status = 0;
  INIT_FAIL(fail);

  Vprintf( "nag_dgemm (f16yac) Example Program Results\n\n");

  /* Skip heading in data file */
  Vscanf("%*[^\n] ");

  /* Read the problem dimensions */
  Vscanf("%ld%ld%ld%*[^\n] ",
         &m, &n, &k);

  /* Read the transpose parameters */
  Vscanf("%s%*[^\n] ", nag_enum_arg);
  /* nag_enum_name_to_value(x04nac).
   * Converts NAG enum member name to value
   */
  transa = nag_enum_name_to_value(nag_enum_arg);
  Vscanf("%s%*[^\n] ", nag_enum_arg);
  /* nag_enum_name_to_value(x04nac).
   * Converts NAG enum member name to value
   */
  transb = nag_enum_name_to_value(nag_enum_arg);
  /* Read scalar parameters */
  Vscanf("%lf%lf%*[^\n] ", &alpha, &beta);

#ifdef NAG_COLUMN_MAJOR
  pdc = m;
  if (transa == Nag_NoTrans && transb == Nag_NoTrans)
    {
      pda = m;
      pdb = k;
    }
  else if ((transa == Nag_Trans || transa == Nag_ConjTrans)
           && transb == Nag_NoTrans)
    {
      pda = k;
      pdb = k;
    }
  else if (transa == Nag_NoTrans &&
           (transb == Nag_Trans || transb == Nag_ConjTrans) )
    {
      pda = m;
      pdb = n;
    }
  else
    {
      pda = k;
      pdb = n;
    }
#else
  pdc = n;
  if (transa == Nag_NoTrans && transb == Nag_NoTrans)
    {
      pda = k;
      pdb = n;
    }
  else if ((transa == Nag_Trans || transa == Nag_ConjTrans)
           && transb == Nag_NoTrans)
    {
      pda = m;
      pdb = n;
    }
  else if (transa == Nag_NoTrans &&
           (transb == Nag_Trans || transb == Nag_ConjTrans) )
    {
      pda = k;
      pdb = k;
    }
  else
    {
      pda = m;
      pdb = k;
    }
#endif

  if (m > 0 && n > 0)
    {

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

  /* Input matrix A */
  if (transa == Nag_NoTrans)
    {
      for (i = 1; i <= m; ++i)
        {
          for (j = 1; j <= k; ++j)
            Vscanf("%lf", &A(i,j));
          Vscanf("%*[^\n] ");
        }
    }
  else
    {
      for (i = 1; i <= k; ++i)
        {
          for (j = 1; j <= m; ++j)
            Vscanf("%lf", &A(i,j));
          Vscanf("%*[^\n] ");
        }
    }

  /* Input matrix B */
  if (transb == Nag_NoTrans)
    {
      for (i = 1; i <= k; ++i)
        {
          for (j = 1; j <= n; ++j)
            Vscanf("%lf", &B(i,j));
          Vscanf("%*[^\n] ");
        }
    }
  else
    {
      for (i = 1; i <= n; ++i)
        {
          for (j = 1; j <= k; ++j)
            Vscanf("%lf", &B(i,j));
          Vscanf("%*[^\n] ");
        }
    }

  /* Input matrix C */
  for (i = 1; i <= m; ++i)
    {
      for (j = 1; j <= n; ++j)
        Vscanf("%lf", &C(i,j));
      Vscanf("%*[^\n] ");
    }

  /* nag_dgemm(f16yac).
   * Matrix-matrix multiply.
   *
   */
  nag_dgemm(order, transa, transb, m, n, k, alpha, a, pda,
            b, pdb, beta, c, pdc, &fail);
  if (fail.code != NE_NOERROR)
    {
      Vprintf("Error from nag_dgemm.\n%s\n", fail.message);
      exit_status = 1;
      goto END;
    }

  /* Print result */
  /* nag_gen_real_mat_print (x04cac).
   * Print real general matrix (easy-to-use)
   */
  nag_gen_real_mat_print(order, Nag_GeneralMatrix, Nag_NonUnitDiag,
                         m, n, c, pdc, "Matrix Matrix Product",
                         0, &fail);
  if (fail.code != NE_NOERROR)
    {
      Vprintf("Error from nag_gen_real_mat_print (x04cac).\n%s\n",
              fail.message);
      exit_status = 1;
      goto END;
    }

 END:
  if (a) NAG_FREE(a);
  if (b) NAG_FREE(b);
  if (c) NAG_FREE(c);

  return exit_status;
}