/* nag_summary_stats_freq (g01adc) Example Program.
 *
 * Copyright 2001 Numerical Algorithms Group.
 *
 * Mark 7, 2001.
 */

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

int main(int argc, char *argv[])
{
  FILE     *fpin, *fpout;

  /* Scalars */
  double   xsd, xskew, xkurt, xmean;
  Integer  exit_status = 0, i, j, k, kmin1, n, nprob;

  NagError fail;

  /* Arrays */
  double   *x = 0;
  Integer  *ifreq = 0;

  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_summary_stats_freq (g01adc) Example Program Results\n");

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

  fscanf(fpin, "%ld%*[^\n] ", &nprob);
  for (j = 1; j <= nprob; ++j)
    {
      fscanf(fpin, "%ld%*[^\n] ", &kmin1);
      k = kmin1 + 1;

      /* Allocate memory */
      if (!(x = NAG_ALLOC(k, double)) ||
          !(ifreq = NAG_ALLOC(k, Integer)))
        {
          fprintf(fpout, "Allocation failure\n");
          exit_status = -1;
          goto END;
        }

      for (i = 1; i <= kmin1; ++i)
        fscanf(fpin, "%lf%ld", &x[i - 1], &ifreq[i - 1]);
      fscanf(fpin, "%lf%*[^\n] ", &x[k - 1]);

      fprintf(fpout, "\nProblem %4ld\n", j);
      fprintf(fpout, "Number of classes %4ld\n", kmin1);

      /* nag_summary_stats_freq (g01adc).
       * Mean, variance, skewness, kurtosis, etc., one variable,
       * from frequency table
       */
      nag_summary_stats_freq(k, x, ifreq, &xmean, &xsd, &xskew, &xkurt, &n,
                             &fail);

      if (fail.code == NE_NOERROR)
        {
          fprintf(fpout, "Successful call of "
                  "nag_summary_stats_freq (g01adc)\n\n");
          fprintf(fpout, "          Class          Frequency\n\n");
          for (i = 1; i <= kmin1; ++i)
            fprintf(fpout, "%10.2f%10.2f%12ld\n", x[i-1], x[i],
                    ifreq[i-1]);

          fprintf(fpout, "\n Mean %16.4f\n", xmean);
          fprintf(fpout, " Std devn%13.4f\n", xsd);
          fprintf(fpout, " Skewness%13.4f\n", xskew);
          fprintf(fpout, " Kurtosis%13.4f\n", xkurt);
          fprintf(fpout, " Number of cases%8ld\n", n);
        }
      else
        {
          fprintf(fpout, "Error from nag_summary_stats_freq (g01adc).\n%s\n",
                  fail.message);
          exit_status = 1;
        }
      if (x)
        {
          NAG_FREE(x);
          x = 0;
        }
      if (ifreq)
        {
          NAG_FREE(ifreq);
          ifreq = 0;
        }
    }
 END:
  if (fpin != stdin) fclose(fpin);
  if (fpout != stdout) fclose(fpout);
  if (x) NAG_FREE(x);
  if (ifreq) NAG_FREE(ifreq);
  return exit_status;
}