Build a data structure from the relational layout you have provided aggregating the Yes and No entries and then walk the resulting structure to print the desired results. For safety you could add some data validation.
use feature ":5.14";
use warnings FATAL => qw(all);
use strict;
use Data::Dump qw(dump pp);
my @l = split /\n/, << 'END';
Ubuntu,Warty,No
Ubuntu,Hoary,No
Ubuntu,Breezy,Yes
Ubuntu,Breazy,Yes
Fedora,Yarrow,Yes
Fedora,Stentz,No
Fedora,Yarrow,Yes
Fedora,Yarrow,Yes
Windows,XP PRO,Yes
Windows,XP PRO,Yes
Windows,XP Home,No
Windows,XP PRO,Yes
END
my $h;
for(@l)
{my @w = split /,/;
$h->{$w[0]}{$w[1]}{$w[2]}++;
}
pp($h);
for my $o(sort keys %$h)
{for my $r(sort keys %{$h->{$o}})
{my %yn = %{$h->{$o}{$r}};
my ($yes, $no) = ($yn{Yes}//0, $yn{No}//0);
say "$o\t$r\t$yes\t$no";
}
}
Produces
{
Fedora => { Stentz => { No => 1 }, Yarrow => { Yes => 3 } },
Ubuntu => {
Breazy => { Yes => 1 },
Breezy => { Yes => 1 },
Hoary => { No => 1 },
Warty => { No => 1 },
},
Windows => { "XP Home" => { No => 1 }, "XP PRO" => { Yes => 3 } },
}
Fedora Stentz 0 1
Fedora Yarrow 3 0
Ubuntu Breazy 1 0
Ubuntu Breezy 1 0
Ubuntu Hoary 0 1
Ubuntu Warty 0 1
Windows XP Home 0 1
Windows XP PRO 3 0
-
Are you posting in the right place? Check out Where do I post X? to know for sure.
-
Posts may use any of the Perl Monks Approved HTML tags. Currently these include the following:
<code> <a> <b> <big>
<blockquote> <br /> <dd>
<dl> <dt> <em> <font>
<h1> <h2> <h3> <h4>
<h5> <h6> <hr /> <i>
<li> <nbsp> <ol> <p>
<small> <strike> <strong>
<sub> <sup> <table>
<td> <th> <tr> <tt>
<u> <ul>
-
Snippets of code should be wrapped in
<code> tags not
<pre> tags. In fact, <pre>
tags should generally be avoided. If they must
be used, extreme care should be
taken to ensure that their contents do not
have long lines (<70 chars), in order to prevent
horizontal scrolling (and possible janitor
intervention).
-
Want more info? How to link
or How to display code and escape characters
are good places to start.