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my $ct=0;  my @nxxult = (); my @Ultmnsort = (); my @indexUlt = ();
for(my $rn=4;$rn<=32;$rn +=4)
...
        [$#indexUlt]\n");
     print TEST3 ("ct = $ct\n");
  }

#@indexUlt=sort{$nxxult[$a]<=>$nxxult[$b]} 0 ... $#nxxult;

Use of uninitialized value in numeric comparison (<=>) at C:\SORT.pl l
+ine 791, <AREA> line 22371.