fprintf(stderr, "\nERROR: Input file %s cannot be opened\n\n", tfile);	exit(2);      }      point = 0;      while ( (fscanf(ftest, "%f", &a_point)) != EOF){	t_points[point] = a_point;	point++;      }            fprintf(stdout, "Matching probe: %s ", line);      fval = FLT_MAX;      for (i=0; i < no_kfiles; i++){	if (do_bayesian)	  dist = bayesian_distance(t_points, kfaces[i].coeffs, 				   total_no_points, &B_struct);	else	  dist = find_distance(t_points+a, kfaces[i].coeffs+a, no_points);		if (dist < fval)	  fval = dist;	/* Create a match */	a_match = (Matchptr) calloc(1, sizeof(Match));	a_match->name = strdup(kfaces[i].name);	a_match->distance = dist;	a_match->next = NULL;		/* Add to the list of matches of that particular face */	faces[file_no].similar = add_match(faces[file_no].similar, a_match, n);      }      fprintf(stdout, "\tD_min = %+1.6e \n", fval);      fclose(ftest);            /* Begin Hack for FERET test sept 16 1996 */      count =  print_file(faces[file_no], n, out_file, thres, count);      kill_list(faces[file_no].similar);      /* End Hack for FERET test sept 16 1996 */      file_no++;    } /* if ( (strncmp(line........... */  }   /* while ( (fscanf(ftlist........ */  fclose(ftlist);  /* Begin Hack for FERET test sept 16 1996 */  fprintf(stdout, "%f\n", (float) count/no_files);  fprintf(stdout, "\n\nThe recognition rate is  %f  (%d/%d)\n", 	  (float) count/no_files, count, no_files);  /* Begin Hack for FERET test sept 16 1996 */     /* print_match(faces, n, no_files, out_file, thres, comline); */} /* Main */ float find_distance(float *test, float *known, int no){  int i;  float sum=0;    for (i=0; i<no; i++){    sum += ( (test[i] - known[i]) * (test[i]-known[i]));  }  return (sqrt(sum));}float bayesian_distance(float *test, float *known, int N,			Bayesian *B){  register int i,j,k;  static float C0[MAX_NDIM];  static float C1[MAX_NDIM];  static float x[MAX_NDIM];  static float y[MAX_NDIM];  float f0,f1;  float L0,L1;  /* compute the difference vector (my arrays start with 1) */  for (i=0; i<N; i++)    x[i+1] = test[i] - known[i];  /* project onto intra space */  for (i=1; i<=N; i++)    y[i] = x[i] - B->intra_kl[1][i];  for (j=B->a; j<=B->b; j++) {    f0 = 0;    for (i=1; i<=N; i++)       f0 += (y[i] * B->intra_kl[1+j][i]);    C0[j] = f0;  }      /* project onto extra space */  for (i=1; i<=N; i++)    y[i] = x[i] - B->extra_kl[1][i];  for (j=B->a; j<=B->b; j++) {    f1 = 0;    for (i=1; i<=N; i++)       f1 += (y[i] * B->extra_kl[1+j][i]);    C1[j] = f1;  }      /* compute intra log-likelihood */  f0 = 0;  for (i=B->a; i<=B->b; i++)     f0 += (C0[i]*C0[i]/(B->intra_kl[B->N+2][i]));  L0 = -0.5 * f0 - B->logD0;  /* compute extra log-likelihood */  f1 = 0;  for (i=B->a; i<=B->b; i++)     f1 += (C1[i]*C1[i]/(B->extra_kl[B->N+2][i]));  L1 = -0.5 * f1 - B->logD1;    /* return NEGATIVE log-ratio as a distance */  return (L1 - L0 + B->logP1 - B->logP0);}Matchptr add_match(Matchptr root, Matchptr new, int n){  Matchptr temp, prev;  int count = 0;  if (root==NULL)    return new;  else {    if (root->distance > new->distance){      new->next = root;      return new;    }  }    temp = root;  prev = root;  while ( ((temp != NULL) && (count != n))  && (temp->distance <= new->distance)){    prev = temp;    temp = temp->next;    count++;  }  new->next = temp;  prev->next = new;  return root;}/*char *strdup(char *s)  {  char *p = (char*)malloc(strlen(s) + 1);  if (p==NULL) {  fprintf(stderr, "Error: Memory cannot be allocated");  exit (5);  }  return(strcpy(p, s));  }  */void print_match(Tface *faces, int n, int no_files, char out[], float thres, 		 char comline[]){  /* What this function does is print out the results of the matching stage */  /* For each probe in Tfaces, it fines the neighbors from the linked list  */  /* and prints out the results in a file and in a directory with a file    */  /* hte same name as the probe                                             */  int i, j,k, count, l, rec=0;  float d, e;  Matchptr temp;  FILE *fp, *f_file;  char test[MAX_CHARS], known[MAX_CHARS], outfile[MAX_CHARS];  sprintf(outfile,"%s%s", out, ".out");  if ( (fp = fopen(outfile, "w")) == NULL){    fprintf(stderr, "\nERROR: Input file %s cannot be opened\n\n", out);    exit(2);  }    fprintf(stderr, "Command line : %s \n\n", comline);  fprintf(fp, "Command Line: %s\n\n", comline);  fprintf(fp, "<Probe number> <Match order> <Gallery Match Number> <Found Flag> <Confidence>\n");  /* for each probe, we get the matches from the linked list and then print out the results in a out file as well as in a file in the directory with the same  name as the probe. */  /* For each probe */  for (i=0; i<no_files; i++){    temp = faces[i].similar;    count = 1;        fprintf(fp, "\n\n");    /* Extract the numerical part of the file name */    l = strlen(faces[i].name);    for (k=0; k<l ; k++){      if ( faces[i].name[k] >= '0' && faces[i].name[k] <= '9'){       test[k] = faces[i].name[k];     }      else       break;    }    test[k]='\0';    /* open the file in the directory with the same name */    strcpy(outfile, "");    sprintf(outfile,"%s/%s.mit", out, test);    if ( (f_file = fopen(outfile,"w")) == NULL){      fprintf(stderr, "\n ERROR: Input file %s cannot be opened\n", outfile);      exit(2);    }       if (n==0){      while (temp != NULL){	  l = strlen(temp->name);	  for (k=0; k<l; k++){	    if ( temp->name[k] >= '0' && temp->name[k] <= '9'){	      known[k] = temp->name[k];	    }	    else	      break;	  }	  known[k] = '\0';	  	  if (count ==1){	    d = temp->distance; 	    if ( strcmp(test, known)==0){	      rec++;	    }	  }	  	  if (do_bayesian)	    e = 100.0/(1 + exp(sigmoid_scale * temp->distance));	  else	    e = 100*log(conf_factor)/log(temp->distance + conf_factor);;	  fprintf(fp, "%4i %3i   %4i   %1d   %3.2f \n", 		  atoi(test), count, atoi(known),((e > thres) ? 1 : 0), e);	  fprintf(f_file, "%4d\t%4d\t%f\n", count, atoi(known), e);	  temp = temp->next;	  count++;	}    }    else {      for (j=0; j<n; j++){	l = strlen(temp->name);	for (k=0; k<l; k++){	  if (temp->name[k] >= '0' && temp->name[k] <= '9')	    known[k] = temp->name[k];	  else 	    break;	}	known[k] = '\0';		if (count == 1) {	  d  = temp->distance;	  if ( strcmp(test, known)== 0){	    rec++;	  }	}		if (do_bayesian)	  e = 100.0/(1 + exp(sigmoid_scale * temp->distance));	else	  e = 100*log(conf_factor)/log(temp->distance + conf_factor);;	fprintf(fp, "%4i %3i   %4i   %1d   %3.2f \n", 		atoi(test), count, atoi(known),((e > thres) ? 1 : 0), e);	fprintf(f_file, "%4d\t%4d\t%f\n", count, atoi(known), e);		temp = temp->next;	count++;	/* fprintf(stderr, "the value of e is %f\n", e);	fprintf(stderr, "the value of d is %f\n", d); */      }    }    fclose(f_file);  }  fprintf(stdout, "%f\n", (float) rec/no_files);  fprintf(stderr, "\n\nThe recognition rate is  %f  (%d/%d)\n", 	  (float) rec/no_files, rec, no_files);  fprintf(fp, "\n\nThe recognition rate is  %f  (%d/%d)\n", 	  (float) rec/no_files, rec, no_files);    fclose(fp);}int number_files(char list[]){  int no_files;  char line[MAX_CHARS];  FILE *flist;      /* Loop over input list file and calculate total no. of      test files and create the array of tfaces */  if ( (flist = fopen(list, "r")) == NULL){    fprintf(stderr, "\nERROR: Input file %s cannot be opened \n\n", list);    exit(2);  }  no_files = 0;  while (fscanf(flist, "%s", line) != EOF){    if ( (strncmp(line, "#", 1) != 0) && (strlen(line) > 1))      no_files++;  }    fclose(flist);  return (no_files);}int print_file(Tface tfaces, int n, char out[], float thres, int count){  int i, j, k, l, rec = 1;  float d, e;  Matchptr temp;  FILE *f_file;  char test[MAX_CHARS], known[MAX_CHARS], outfile[MAX_CHARS];    temp = tfaces.similar;    l = strlen(tfaces.name);  for (k=0; k<l ; k++){    if ( tfaces.name[k] >= '0' && tfaces.name[k] <= '9'){      test[k] = tfaces.name[k];    }    else       break;  }  test[k]='\0';  /* NEW FERET format/HACK */  strcpy(outfile,"");  sprintf(outfile, "%s/%s.mit", out, test);  if ( (f_file = fopen(outfile, "w")) == NULL){    fprintf(stderr, "\n ERROR: Input file %s cannot be opened \n", outfile);    exit(2);  }  /* NEW FERET format/HACK */  for (j=0; j<n; j++){    l = strlen(temp->name);    for (k=0; k<l; k++){      if (temp->name[k] >= '0' && temp->name[k] <= '9')	known[k] = temp->name[k];      else 	break;    }    known[k] = '\0';        if (rec == 1){      d = temp->distance;      if (strcmp(test, known) == 0){	count++;      }    }        if (do_bayesian){      e = 100/(1+exp(sigmoid_scale * temp->distance));    }    else {      e = 100* log(conf_factor)/log(temp->distance + conf_factor);    }    fprintf(f_file, "%4d\t%4d\t%11.8f\n", rec, atoi(known), e);    fflush(f_file);    temp = temp->next;    rec++;  }  fclose(f_file);  return(count);}void kill_list(Matchptr list){  if (!empty_list(list)){    kill_list(list->next);    free(list->name);    free(list);  }}int empty_list(Matchptr list){  if (list == NULL)    return (1);  return (0);}