/* nag_bessel_k0_scaled_vector (s18cqc) Example Program.
 *
 * Copyright 2011, Numerical Algorithms Group.
 *
 * Mark 23 2011.
 */
#include <nag.h>
#include <stdio.h>
#include <nag_stdlib.h>
#include <nags.h>

int main(void)
{
  Integer  exit_status = 0;
  Integer  i, n;
  double   *f, *x;
  Integer  *ivalid;
  NagError fail;

  INIT_FAIL(fail);

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

  printf("nag_bessel_k0_scaled_vector (s18cqc) Example Program Results\n");
  printf("\n");
  printf("     x           f          ivalid\n");
  printf("\n");
  scanf("%ld", &n);
  scanf("%*[^\n]");

  /* Allocate memory */
  if (!(x = NAG_ALLOC(n, double)) ||
      !(f = NAG_ALLOC(n, double)) ||
      !(ivalid = NAG_ALLOC(n, Integer)))
    {
      printf("Allocation failure\n");
      exit_status = -1;
      goto END;
    }

  for (i=0; i<n; i++)
    scanf("%lf", &x[i]);
  scanf("%*[^\n]");

  /* nag_bessel_k0_scaled_vector (s18cqc).
   * Scaled Bessel function K0(x)
   */
  nag_bessel_k0_scaled_vector(n, x, f, ivalid, &fail);
  if (fail.code!=NE_NOERROR && fail.code!=NW_IVALID)
    {
      printf("Error from nag_bessel_k0_scaled_vector (s18cqc).\n%s\n",
             fail.message);
      exit_status = 1;
      goto END;
    }

  for (i=0; i<n; i++)
    printf(" %11.3e %11.3e %4ld\n", x[i], f[i], ivalid[i]);

 END:
  if (f) NAG_FREE(f);
  if (x) NAG_FREE(x);
  if (ivalid) NAG_FREE(ivalid);

  return exit_status;
}