Here's my version that's a little more perlish as you'd say.:

use Data::Dumper;

use strict;
use warnings;

sub pivot {
    my @src = @_;

    my $max_col = 0;
    $max_col < $#$_ and $max_col = $#$_ for @src;

    my @dest;
    for my $col (0..$max_col) {
        my @new_row;
        for my $row (0..$#src) {
            push @new_row, $src[$row][$col] // '';
        }
        push @dest, \@new_row;
    }

    return @dest;
}

my @test = (
    [1..5],
    [11..15],
    [21..25],
    [31..35],
    [41],
    [51..55],
);

my @results = pivot(@test);
print Dumper(\@results);

=prints
$VAR1 = [
          [1,11,21,31,41,51],
          [2,12,22,32,'',52],
          [3,13,23,33,'',53],
          [4,14,24,34,'',54],
          [5,15,25,35,'',55]
        ];
=cut
[download]

Update: And a little more perlish still would be to use map:

sub pivot {
    my @src = @_;

    my $max_col = 0;
    $max_col < $#$_ and $max_col = $#$_ for @src;

    my @dest;
    for my $col (0..$max_col) {
        push @dest, [map {$src[$_][$col] // ''} (0..$#src)];
    }

    return @dest;
}
[download]

This last is actually my preferred way of doing this, since it's easy to see what the inner loop is iterating on.

- Miller

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