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lib/Algorithm/DistanceMatrix.pm  view on Meta::CPAN

=head2 metric

Callback for computing the distance, similarity, or whatever measure you like.

 $matrix->metric(\@mydistance);

Where C<mydistance> receives two objects as it's first two arguments.

If you need to pass special parameters to your method:

 $matrix->metric(sub{my($x,$y)=@_;mydistance(first=>$x,second=>$y,mode=>'fast')};

You may use any metric, and may return any number or object. Note that if you 
plan to use this with L<Algorithm::Cluster> this needs to be a distance metric.
So, if you're measure how similar two things are, on a scale of 1-10, then you
should return C<10-$similarity> to get a distance.

Default is the absolute values of the scalar difference (i.e. C<abs(X-Y)>)

=head2 objects