/* nag_1d_spline_deriv (e02bcc) Example Program.
 *
 * Copyright 1991 Numerical Algorithms Group.
 *
 * Mark 2, 1991.
 *
 * Mark 3 revised, 1994.
 * Mark 8 revised, 2004.
 */

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


int main(void)
{
  Integer exit_status=0, i, j, l, m, ncap, ncap7;
  NagError fail;
  Nag_DerivType derivs;
  Nag_Spline spline;
  double s[4], x;

  INIT_FAIL(fail);

  Vprintf("nag_1d_spline_deriv (e02bcc) Example Program Results\n");
  Vscanf("%*[^\n]"); /* Skip heading in data file */
  while(scanf("%ld%ld",&ncap,&m) != EOF)
    {
      if (m<=0)
        {
          Vprintf("Invalid m.\n");
          exit_status = 1;
          return exit_status;
        }
      if (ncap>0)
        {
          ncap7 = ncap+7;
          spline.n = ncap7;
          if ( !(spline.c = NAG_ALLOC(ncap7, double)) ||
               !(spline.lamda = NAG_ALLOC(ncap7, double)) )
            {
              Vprintf("Allocation failure\n");
              exit_status = -1;
              goto END;
            }
        }
      else
        {
          Vprintf("Invalid ncap.\n");
          exit_status = 1;
          return exit_status;
        }
      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++)
            {
              /* nag_1d_spline_deriv (e02bcc).
               * Evaluation of fitted cubic spline, function and
               * derivatives
               */
              nag_1d_spline_deriv(derivs, x, s, &spline, &fail);
              if (fail.code != NE_NOERROR)
                {
                  Vprintf("Error from nag_1d_spline_deriv (e02bcc).\n%s\n",
                          fail.message);
                  exit_status = 1;
                  goto END;
                }

              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");
    END:
      NAG_FREE(spline.c);
      NAG_FREE(spline.lamda);
    }
  return exit_status;
}