/* nag_stat_prob_chisq_noncentral (g01gcc) Example Program.
 *
 * Copyright 2023 Numerical Algorithms Group.
 *
 * Mark 29.2, 2023.
 */

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

int main(void) {
  Integer exit_status = 0, max_iter;
  NagError fail;
  double df, lambda, prob, tol, x;

  INIT_FAIL(fail);

  printf("nag_stat_prob_chisq_noncentral (g01gcc) Example Program Results\n\n");

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

  printf("\n     x       df      lambda   prob\n\n\n");
  tol = 5e-6;
  max_iter = 50;
  while ((scanf(" %lf %lf %lf %*[^\n] ", &x, &df, &lambda)) != EOF)
  {
    /* nag_stat_prob_chisq_noncentral (g01gcc).
     * Computes probabilities for the non-central chi^2
     * distribution
     */
    prob = nag_stat_prob_chisq_noncentral(x, df, lambda, tol, max_iter, &fail);
    if (fail.code != NE_NOERROR) {
      printf("Error from nag_stat_prob_chisq_noncentral (g01gcc).\n%s\n",
             fail.message);
      exit_status = 1;
      goto END;
    }
    printf("%8.3f %8.3f %8.3f %8.4f\n", x, df, lambda, prob);
  }
END:
  return exit_status;
}