/* nag_prob_non_central_students_t (g01gbc) Example Program.
 *
 * Copyright 1999 Numerical Algorithms Group.
 *
 * Mark 6a revised, 2001.
 */

#include <stdio.h>
#include <nag.h>
#include <nagx04.h>
#include <nagg01.h>

int main(int argc, char *argv[])
{
  FILE     *fpin, *fpout;
  Integer  exit_status = 0, max_iter;
  NagError fail;
  double   delta, df, prob, t, tol;

  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);
  fprintf(fpout,
          "nag_prob_non_central_students_t (g01gbc) Example Program Results"
          "\n\n");

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

  fprintf(fpout, "      t       df    delta    prob\n\n");
  tol = 5e-6;
  max_iter = 50;
  while ((fscanf(fpin, "%lf %lf %lf %*[^\n]", &t, &df, &delta)) != EOF)
    {
      /* nag_prob_non_central_students_t (g01gbc).
       * Computes probabilities for the non-central Student's
       * t-distribution
       */
      prob = nag_prob_non_central_students_t(t, df, delta, tol, max_iter,
                                             &fail);
      if (fail.code == NE_NOERROR)
        fprintf(fpout, " %8.3f%8.3f%8.3f%8.4f\n", t, df, delta, prob);
      else
        {
          fprintf(fpout,
                  "Error from nag_prob_non_central_students_t (g01gbc).\n%s\n",
                  fail.message);
          exit_status = 1;
          goto END;
        }
    }
 END:
  if (fpin != stdin) fclose(fpin);
  if (fpout != stdout) fclose(fpout);
  return exit_status;
}