note nemesdani $1 is the first bracketed match in a regular expression, you don't want that.<br><br> Why didn't you write simply <c>my $predict = $_</c>?<br><br> Another suggestion: use the 3 argument form of <c>open</c>.<br><br> <c>if ($train = $predict)</c> is also wrong: You have to use <c>==</c> when checking. <div class="pmsig"><div class="pmsig-952739"> <br>I'm too lazy to be proud of being impatient. </div></div> 995306 995306