Me again I have another problem with the script and since I frankly don't fully understand it, I ask again here:
Please look at the output of: 

use strict;
use warnings;
use Algorithm::Diff qw( );

my @seqs = (
   [qw( A B C D E F G H I )],
   [qw( A D C X F G H I )],
#   [qw( A  )],
  # [qw( A B C )],
);

my @combined;
my @grid;

for my $col_idx (0..$#seqs) {
   my $seq = $seqs[$col_idx];

   my $diff = Algorithm::Diff->new(\@combined, $seq);

   my @new_combined;
   my @new_grid;
   while ($diff->Next()) {
      if ($diff->Same()) {
         for ($diff->Range(1)) {
            push @new_combined, $combined[$_];
            push @new_grid,     $grid[$_];

            $new_grid[-1][$col_idx] = 1;
         }
      } else {
         for ($diff->Range(1)) {
            push @new_combined, $combined[$_];
            push @new_grid,     $grid[$_];
         }

         for ($diff->Range(2)) {
            push @new_combined, $seq->[$_];
            push @new_grid,     [];

            $new_grid[-1][$col_idx] = 1;
         }
      }
   }

   @combined = @new_combined;
   @grid     = @new_grid;
}

for my $row_idx (0..$#combined) {
   my $ch = $combined[$row_idx];

   for my $col_idx (0..$#seqs) {
      print($grid[$row_idx][$col_idx] ? $ch : " ", " ");
   }

   print("\n");
}

[download]

It outputs

A A
B
C
D D
E
  C
  X
F F
G G
H H
I I

[download]

What I want is:

A A
B B
C C
D
  X
E
F F
G G
H H
I I

[download]

The rows must be, so to say, unique, meaning that there must not be a "C" in line 3 and one in line "6". What I also wonder is: The Documentation of Algorithm:Diff reads that if finds the LCS. But for my example it finds 6 common rows while I find 7 ...
Greetings,
Jan

In reply to Re^3: Converting Arrays into Matrix by Anonymous Monk
in thread Converting Arrays into Matrix by janDD

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