File Coverage

blib/lib/Set/Similarity/BV/Cosine.pm

Criterion	Covered	Total	%
statement	14	14	100.0
branch			n/a
condition			n/a
subroutine	5	5	100.0
pod	1	1	100.0
total	20	20	100.0

package Set::Similarity::BV::Cosine;

use strict;
use warnings;

use parent 'Set::Similarity::BV';

our $VERSION = '0.06';

use Data::Dumper;

sub from_integers {
  my ($self, $v1, $v2) = @_;

  #print Dumper($v1, $v2);
  #print 'from_integers() $v1: ',$v1->[0],' $v2: ',$v2->[0],"\n";

  #print 'from_integers: ',"\n";
  #print '  $self->bits($v1): ',$self->bits($v1),' ',"\n";
  #print '  $self->bits($v2): ',$self->bits($v2),' ',"\n";
  #print '  $self->intersection($v1,$v2): ',$self->intersection($v1,$v2),' ',"\n";
  #print '  $self->bits($v2): ',$self->bits($v2),' ',"\n";

  # it is so simple because the vectors contain only 0 and 1
  return (
    $self->intersection($v1,$v2) / (
      sqrt($self->bits($v1)) * sqrt($self->bits($v2))
    )
  );
}

1;

__END__