/* nag_dger (f16pmc) 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, incx, incy, j, m, n, pda, xlen, ylen;

  /* Arrays */
  double        *a = 0, *x = 0, *y = 0;

  /* Nag Types */
  NagError      fail;
  Nag_OrderType order;
  Nag_ConjType  conj;

#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

  exit_status = 0;
  conj = Nag_NoConj;
  INIT_FAIL(fail);

  printf("nag_dger (f16pmc) Example Program Results\n\n");

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

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

  /* Read scalar parameters */
  scanf("%lf%lf%*[^\n] ", &alpha, &beta);
  /* Read increment parameters */
  scanf("%ld%ld%*[^\n] ", &incx, &incy);

#ifdef NAG_COLUMN_MAJOR
  pda = m;
#else
  pda = n;
#endif

  xlen = MAX(1, 1 + (m - 1)*ABS(incx));
  ylen = MAX(1, 1 + (n - 1)*ABS(incy));

  if (m > 0 && n > 0)
    {
      /* Allocate memory */
      if (!(a = NAG_ALLOC(m*n, double)) ||
          !(x = NAG_ALLOC(xlen, double)) ||
          !(y = NAG_ALLOC(ylen, double)))
        {
          printf("Allocation failure\n");
          exit_status = -1;
          goto END;
        }
    }
  else
    {
      printf("Invalid m or n\n");
      exit_status = 1;
      return exit_status;
    }

  /* Input matrix A and vectors x and y */

  for (i = 1; i <= m; ++i)
    {
      for (j = 1; j <= n; ++j)
        scanf("%lf", &A(i, j));
      scanf("%*[^\n] ");
    }
  for (i = 0; i < xlen; ++i)
    scanf("%lf%*[^\n] ", &x[i]);
  for (i = 0; i < ylen; ++i)
    scanf("%lf%*[^\n] ", &y[i]);

  /* nag_dger(f16pmc).
   * Rank one update of real matrix.
   *
   */
  nag_dger(order, conj, m, n, alpha, x, incx, y, incy, beta,
           a, pda, &fail);
  if (fail.code != NE_NOERROR)
    {
      printf("Error from nag_dger.\n%s\n", fail.message);
      exit_status = 1;
      goto END;
    }

  /* Print updated matrix A */
  /* nag_gen_real_mat_print (x04cac).
   * Print real general matrix (easy-to-use)
   */
  fflush(stdout);
  nag_gen_real_mat_print(order, Nag_GeneralMatrix, Nag_NonUnitDiag, m,
                         n, a, pda, "Updated Matrix A", 0, &fail);
  if (fail.code != NE_NOERROR)
    {
      printf("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 (x) NAG_FREE(x);
  if (y) NAG_FREE(y);

  return exit_status;
}