/* nag_1d_spline_deriv(e02bcc) 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 i, j, l, m, ncap, ncap7;
  double s[4], x;
  Nag_Spline spline;
  Nag_DerivType derivs;

  Vprintf("e02bcc Example Program Results\n");
  Vscanf("%*[^\n]"); /* Skip heading in data file */
  while(scanf("%ld%ld",&ncap,&m) != EOF)
    {
      if (m>0)
        {
          if (ncap>0)
            {
              ncap7 = ncap+7;
              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]));
                  Vprintf("        x             Spline    1st deriv  "
                          "2nd deriv   3rd deriv");
                  for (i=1; i<=m; i++)
                    {
                      Vscanf("%lf",&x);
                      derivs = Nag_LeftDerivs;
                      for (j=1; j<=2; j++)
                        {
                          e02bcc(derivs, x, s, &spline, NAGERR_DEFAULT);
                          if (derivs ==Nag_LeftDerivs)
                            {
                              Vprintf("\n\n%11.4f   Left",x);
                              for (l=0; l<4; l++)
                                Vprintf("%11.4f",s[l]);
                            }
                          else
                            {
                              Vprintf("\n%11.4f  Right",x);
                              for (l=0; l<4; l++)
                                Vprintf("%11.4f",s[l]);
                            }
                          derivs = Nag_RightDerivs;
                        }
                    }
                  Vprintf("\n");
                  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;
}