/* nag_ken_spe_corr_coeff (g02brc) Example Program.
 *
 * Copyright 1992 Numerical Algorithms Group.
 *
 * Mark 3, 1993.
 * Mark 8 revised, 2004.
 */

#include <nag.h>
#include <stdio.h>
#include <nag_stdlib.h>
#include <nagg02.h>

#define X(I,J) x[(I)*tdx + J]
#define CORR(I,J) corr[(I)*tdcorr + J]

int main(void)
{
  Integer exit_status=0, i, j, m, n, *sobs=0, *sobsptr, *svar=0, *svarptr;
  Integer tdcorr, tdx;
  NagError fail;
  char s, w;
  double *corr=0, *x=0;

  INIT_FAIL(fail);

  Vprintf("nag_ken_spe_corr_coeff (g02brc) Example Program Results\n");

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

  /* Read data */
  Vscanf("%ld%ld\n",&m,&n);
  if (m>=2 && n>=2)
    {
      if ( !( x = NAG_ALLOC(n*m, double)) ||
           !( corr = NAG_ALLOC(m*m, double))  ||
           !( svar = NAG_ALLOC(m, Integer)) ||
           !( sobs = NAG_ALLOC(n, Integer)) )
        {
          Vprintf("Allocation failure\n");
          exit_status = -1;
          goto END;
        }
      tdx = m;
      tdcorr = m;
    }
  else
    {
      Vprintf("Invalid m or n.\n");
      exit_status = 1;
      return exit_status;
    }
  for (i=0; i<n; i++)
    for (j=0; j<m; j++)
      Vscanf("%lf",&X(i,j));

  /* Read flag specifying if svar is to be supplied */
  Vscanf(" %c",&s);
  if (s == 'S' || s == 's')
    {
      /* Assign pointer to svar and read in values for svar */
      svarptr = svar;
      for (i=0; i<m; i++)
        Vscanf("%ld",&svar[i]);
    }
  else
    {
      /* Assign pointer to NULL and discard rest of line */
      svarptr = (Integer *)0;
      Vscanf(" %*[^\n]"); /* skip rest of line */
    }

  /* Read flag specifying if sobs is to be supllied */
  Vscanf(" %c",&w);
  if (w == 'W' || w == 'w')
    {
      /* Assign pointer to sobs and read in values for sobs */
      sobsptr = sobs;
      for (i=0; i<n; i++)
        Vscanf("%ld",&sobs[i]);
    }
  else
    {
      /* Assign pointer to NULL and discard rest of line */
      sobsptr = (Integer *)0;
      Vscanf(" %*[^\n]"); /* skip rest of line */
    }

  /* Calculate the Kendall and Spearman coefficients */
  /* nag_ken_spe_corr_coeff (g02brc).
   * Kendall and/or Spearman non-parametric rank correlation
   * coefficients, allows variables and observations to be
   * selectively disregarded
   */
  nag_ken_spe_corr_coeff(n, m, x, tdx, svarptr, sobsptr, corr, tdcorr,
                         &fail);
  if (fail.code != NE_NOERROR)
    {
      Vprintf("Error from nag_ken_spe_corr_coeff (g02brc).\n%s\n",
              fail.message);
      exit_status = 1;
      goto END;
    }


  Vprintf("\nCorrelation coefficients:\n\n");
  for (i=0; i<m; i++)
    {
      for (j=0; j<m; j++)
        Vprintf("%8.5f ", CORR(i,j));
      Vprintf("\n");
    }
 END:
  if (x) NAG_FREE(x);
  if (corr) NAG_FREE(corr);
  if (svar) NAG_FREE(svar);
  if (sobs) NAG_FREE(sobs);
  return exit_status;
}