Assuming your example contains some typos, you may want to go for:
use 5.010; use strict; use warnings; use List::Util 'max'; my (%data, %all, @keys); while (<DATA>) { chomp; my @chunks = split; my $key = shift @chunks; push @keys, $key unless exists $data{$key}; foreach my $chunk (@chunks) { $data{$key}{$chunk}++; $all{$chunk} = 1; } } my @fields = sort {$a <=> $b} keys %all; my $l = max map {length} @fields; foreach my $key (@keys) { while (keys %{$data{$key}}) { print $key, " "; foreach my $field (@fields) { if ($data{$key}{$field}) { printf "%${l}s ", $field; delete $data{$key}{$field} unless --$data{$key}{$field +}; } else { printf "%${l}s ", "-"; } } print "\n"; } } __DATA__ 0. 1 1 7 2 2 9 4 6 8 10 2 1. 10 1 6 3 4 9 2. 5 8 59 77 81 3 3. 16 17 19 23 3
The result:
0. 1 2 - 4 - 6 7 8 9 10 - - - - - - - 0. 1 2 - - - - - - - - - - - - - - - 0. - 2 - - - - - - - - - - - - - - - 1. 1 - 3 4 - 6 - - 9 10 - - - - - - - 2. - - 3 - 5 - - 8 - - - - - - 59 77 81 3. - - 3 - - - - - - - 16 17 19 23 - - -
Changing the sorting of fields if you have non-numeric fields is left as an exercise to the reader.

In reply to Re: Writing data into columns by JavaFan
in thread Writing data into columns by $new_guy

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