++ed by:
Author image Darko Obradovic
and 1 contributors


AI::CBR::Case - case definition and representation


Define and initialise a case. In a productive system, you will want to encapsulate this.

    use AI::CBR::Case;
    use AI::CBR::Sim qw(sim_frac sim_eq sim_set);

    # assume we are a doctor and see a patient
    # shortcut one-time generated case
    my $case = AI::CBR::Case->new(
        age      => { value => 30,             sim => \&sim_frac },
        gender   => { value => 'male',         sim => \&sim_eq   },
        job      => { value => 'programmer',   sim => \&sim_eq   },
        symptoms => { value => [qw(headache)], sim => \&sim_set  },
    # or case-specification with changing data
    my $patient_case = AI::CBR::Case->new(
        age      => { sim => \&sim_frac },
        gender   => { sim => \&sim_eq   },
        job      => { sim => \&sim_eq   },
        symptoms => { sim => \&sim_set  },
    foreach my $patient (@waiting_queue) {
        $patient_case->set_values( %$patient ); # assume $patient is a hashref with the right attributes



Creates a new case specification. Pass a hash of hash references as argument. The hash keys identify the attributes of the case, the hash reference specifies this attribute, with the following values:

  • sim: a reference to the similarity function to use for this attribute

  • param: the parameter for the similarity function, if required

  • weight: the weight of the attribute in the comparison of the case. If you do not give a weight value for an attribute, the package's $DEFAULT_WEIGHT will be used, which is 1 by default.

  • value: the value of the attribute, if you want to specify the complete case immediately. You can also do this later.


Pass a hash of attribute keys and values. This will overwrite existing values, and can thus be used as a faster method for generating new cases with the same specification.


See AI::CBR for an overview of the framework.


Darko Obradovic, <dobradovic at gmx.de>


Please report any bugs or feature requests to bug-ai-cbr at rt.cpan.org, or through the web interface at http://rt.cpan.org/NoAuth/ReportBug.html?Queue=AI-CBR. I will be notified, and then you'll automatically be notified of progress on your bug as I make changes.


You can find documentation for this module with the perldoc command.

    perldoc AI::CBR::Case

You can also look for information at:


Copyright 2009 Darko Obradovic, all rights reserved.

This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself.