/* nag_inteq_abel_weak_weights (d05byc) Example Program.
 *
 * Copyright 2011, Numerical Algorithms Group.
 *
 * Mark 23, 2011.
 */
#include <math.h>
#include <nag.h>
#include <nag_stdlib.h>
#include <nagd05.h>
int main(void)
{
  /* Scalars */
  Integer exit_status = 0;
  Integer i, iorder, iq, j, lomega, n, ncols, ncwt, nmax;
  /* Arrays */
  double  *omega = 0, *sw = 0;
  /* NAG types */
  NagError fail;

  INIT_FAIL(fail);

  printf("nag_inteq_abel_weak_weights (d05byc) Example Program Results\n");

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

  scanf("%ld%*[^\n] ", &iorder);
  scanf("%ld%*[^\n] ", &iq);

  ncwt = pow(2, iq + 1);
  lomega = 2*ncwt;
  ncols = 2 * iorder - 1;
  nmax = ncwt + ncols;

  if (
      !(omega = NAG_ALLOC(lomega, double)) ||
      !(sw = NAG_ALLOC(ncols * nmax, double))
      )
    {
      printf("Allocation failure\n");
      exit_status = -1;
      goto END;
    }

  /*
    nag_inteq_abel_weak_weights (d05byc).
    Generate weights for use in solving weakly singular Abel-type equations.
  */
  nag_inteq_abel_weak_weights(iorder, iq, omega, sw, &fail);

  if (fail.code != NE_NOERROR)
    {
      printf("Error from nag_inteq_abel_weak_weights (d05byc).\n%s\n",
             fail.message);
      exit_status = 1;
      goto END;
    }

  printf("\nFractional convolution weights\n\n");
  for (i = 0; i < ncwt; i++)
    printf("%5ld %9.4f\n", i, omega[i]);

  printf("\nFractional starting weights W\n\n");

#define SW(I, J) sw[J * nmax + I - 1]

  for (n = 1; n <= nmax; n++)
    {
      printf("%5ld ", n);
      for (j = 0; j < ncols; j++) printf("%9.4f", SW(n, j));
      printf("\n");
    }

#undef SW

 END:

  if (sw) NAG_FREE(sw);
  if (omega) NAG_FREE(omega);

  return exit_status;
}