/* nag_1d_spline_evaluate(e02bbc) Example Program
 *
 * Copyright 1991 Numerical Algorithms Group.
 *
 * Mark 2, 1991.
 *
 * Mark 3 revised, 1994.
 */

#include <nag.h>
#include <stdio.h>
#include <nag_stdlib.h>
#include <nage02.h>

int main(void)
{
  Integer ncap, ncap7, r, j, m;
  double a, b, s, x;
  Nag_Spline spline;

  Vprintf("e02bbc Example Program Results\n");
  Vscanf("%*[^\n]");  /* Skip heading in data file */
  while(scanf("%ld",&m) !=EOF)
    {
      if (m>0)
        {
          Vscanf("%ld",&ncap);
          ncap7 = ncap+7;
          if (ncap>0)
            {
              spline.n = ncap7;
              spline.c = NAG_ALLOC(ncap7, double);
              spline.lamda = NAG_ALLOC(ncap7, double);
              if (spline.c != (double *)0 && spline.lamda != (double *)0)
                {
                  for (j=0; j<ncap7; j++)
                    Vscanf("%lf",&(spline.lamda[j]));
                  for (j=0; j<ncap+3; j++)
                    Vscanf("%lf",&(spline.c[j]));
                  a = spline.lamda[3];
                  b = spline.lamda[ncap+3];
                  Vprintf("Augmented set of knots stored in spline.lamda:\n");
                  for (j=0; j<ncap7; j++)
                    Vprintf("%10.4f%s",spline.lamda[j],
                            (j%6==5 || j==ncap7-1) ? "\n" : " ");
                  Vprintf("\nB-spline coefficients stored in spline.c\n\n");
                  for (j=0; j<ncap+3; j++)
                    Vprintf("%10.4f%s",spline.c[j],
                            (j%6==5 || j==ncap+2) ? "\n" : " ");
                  Vprintf("\n      x         Value of cubic spline\n\n");
                  for (r=1; r<=m; ++r)
                    {
                      x = ((double)(m-r) * a + (double)(r-1) * b) / (double)(m-1);
                      e02bbc(x, &s, &spline, NAGERR_DEFAULT);
                      Vprintf("%10.4f%15.4f\n",x,s);
                    }
                  NAG_FREE(spline.c);
                  NAG_FREE(spline.lamda);
                }
              else
                {
                  Vfprintf(stderr,"Storage allocation failed. Reduce the "
                           "size of spline.n\n");
                  return EXIT_FAILURE;
                }
            }
          else
            {
              Vfprintf(stderr,"ncap is negative or zero : ncap = %ld\n",ncap);
              return EXIT_FAILURE;
            }
        }
      else
        {
          Vfprintf(stderr,"m is negative or zero : m = %ld\n",m);
          return EXIT_FAILURE;
        }
    }
  return EXIT_SUCCESS;
}