Perl：在数组的 Hash 中合并重复的键

Question

I having issues with this and wondering if someone could provide some help. I'm parsing a.txt file and want to combine duplicated keys and it's values. Essentially, for each identifier I want to store it's height value. Each "sample" has 2 entries (A & B). I have the file stored like this:

while(...){
    @data= split ("\t", $line);  
                            
    $curr_identifier= $data[0];
    $markername= $data[1];
    $position1= $data[2];
    $height= $data[4];

    if ($line >0){
         $result[0] = $markername;
         $result[1] = $position1;
         $result[2] = $height;
         $result[3] = $curr_identifier;

         $data{$curr_identifier}= [@result];
     }
}

This seems to work fine, but my issue is that when I send this data to below function. It prints the $curr_identifier twice. I only want to populate unique identifiers and check for the presence of it's $height variable.

 if (!defined $data{$curr_identifier}[2]){
            $output1= "no height for both markers- failed";
 } else {
    if ($data{$curr_identifier}[2] eq " ") {
        $output1 = $markername;

    } 
 }
 
 print $curr_identifier, $output1 . "\t" . $output1 . "\n";

Basically, if sample height is present for both markers (A&B), then output is both markers.

'1', 'A', 'B'

If height is not present, then output is empty for reported marker.

'2', 'A', ' '

'3', ' ', 'B'

My current output is printing out like this:

1, A
1, B

2, A
2, ' '

3, ' '
3, B'

_DATA_
Name Marker Position1 Height Time
1   A   A       6246        0.9706
1   B   B       3237        0.9706
2   A                   0
2   B   B       5495        0.9775
3   A   A       11254       0.9694
3   B                       0

Answer 1

Your desired output can essentially be boiled down to these few lines of perl code:

while (<DATA>) {
  ($name,$mark,$pos,$heig,$time) = split /\t/;
  print "'$name','$mark','$pos'\n";
}

__DATA__
... your tab-separated data here ...