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83 lines
1.3 KiB
Perl
83 lines
1.3 KiB
Perl
package Graph::Matrix;
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# $SIG{__DIE__ } = sub { use Carp; confess };
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# $SIG{__WARN__} = sub { use Carp; confess };
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use strict;
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sub new {
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my ($class, $g) = @_;
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my @V = $g->vertices;
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my $V = @V;
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my %V; @V{ @V } = 0 .. $#V;
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bless [ [ map { [ ] } 0 .. $#V ], \%V ], $class;
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}
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sub set {
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my ($m, $u, $v, $val) = @_;
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my ($i, $j) = map { $m->[1]->{ $_ } } ($u, $v);
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$m->[0]->[$i]->[$j] = $val;
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}
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sub get {
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my ($m, $u, $v) = @_;
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my ($i, $j) = map { $m->[1]->{ $_ } } ($u, $v);
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$m->[0]->[$i]->[$j];
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}
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1;
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__END__
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=pod
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=head1 NAME
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Graph::Matrix - create and manipulate a V x V matrix of graph G
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=head1 SYNOPSIS
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use Graph::Matrix;
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use Graph::Directed;
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my $g = Graph::Directed->new;
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$g->add_...(); # build $g
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my $m = Graph::Matrix->new($g);
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$m->get($u, $v)
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$s->get($u, $v, $val)
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=head1 DESCRIPTION
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B<This module is meant for internal use by the Graph module.>
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=head2 Class Methods
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=over 4
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=item new($g)
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Construct a new Matrix from the Graph $g.
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=back
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=head2 Object Methods
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=over 4
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=item get($u, $v)
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Return the value at the edge from $u to $v.
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=item set($u, $v, $val)
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Set the edge from $u to $v to value $val.
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=back
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=head1 AUTHOR AND COPYRIGHT
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Jarkko Hietaniemi F<jhi@iki.fi>
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=head1 LICENSE
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This module is licensed under the same terms as Perl itself.
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=cut
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