/* nag_polygamma_deriv (s14adc) Example Program.
 *
 * Copyright 2002 Numerical Algorithms Group.
 *
 * Mark 7, 2002.
 */

#include <nag.h>
#include <nagx04.h>
#include <stdio.h>
#include <nag_stdlib.h>
#include <nags.h>

int main(int argc, char *argv[])
{
  FILE     *fpin, *fpout;
  Integer  exit_status = 0;
  double   x, w[4];
  int      n, m;
  NagError fail;

  INIT_FAIL(fail);

  /* Check for command-line IO options */
  fpin = nag_example_file_io(argc, argv, "-data", NULL);
  fpout = nag_example_file_io(argc, argv, "-results", NULL);

  /* Skip heading in data file */
  fscanf(fpin, "%*[^\n]");
  fprintf(fpout, "nag_polygamma_deriv (s14adc) Example Program Results\n");
  fprintf(fpout, "%9s%14s%14s%14s%14s\n", "x", "w(0,x)", "w(1,x)", "w(2,x)",
          "w(3,x)");
  while (fscanf(fpin, "%lf", &x) != EOF)
    {
      n = 0;
      m = 4;
      /* nag_polygamma_deriv (s14adc).
       * Scaled derivatives of psi(x)
       */
      nag_polygamma_deriv(x, n, m, w, &fail);
      if (fail.code != NE_NOERROR)
        {
          fprintf(fpout, "Error from nag_polygamma_deriv (s14adc).\n%s\n",
                  fail.message);
          exit_status = 1;
          goto END;
        }
      fprintf(fpout, "%13.4e %13.4e %13.4e %13.4e %13.4e\n",
              x, w[0], w[1], w[2], w[3]);
    }

 END:
  if (fpin != stdin) fclose(fpin);
  if (fpout != stdout) fclose(fpout);
  return exit_status;
}