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package SNA::Network::Algorithm::Connectivity; |
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use strict; |
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use warnings; |
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require Exporter; |
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use base qw(Exporter); |
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our @EXPORT = qw(identify_weak_components); |
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=head1 NAME |
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SNA::Network::Algorithm::Connectivity - identify network components |
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=head1 SYNOPSIS |
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use SNA::Network; |
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my $net = SNA::Network->new(); |
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$net->load_from_pajek_net($filename); |
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... |
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my $number_of_weak_components = $net->identify_weak_components(); |
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=head1 METHODS |
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The following methods are added to L. |
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=head2 identify_weak_components |
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Identifies the weak components in the graph. |
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All componets get an id, starting from 0 on. |
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Stores the component id under the hash entry B for each node object. |
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Returns the number of weak components found in the network. |
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=cut |
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sub identify_weak_components { |
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my ($self) = @_; |
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foreach ($self->nodes) { |
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undef $_->{weak_component_id}; |
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} |
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my $weak_component_id = 0; |
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my @remainder = $self->nodes(); |
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do { |
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_weakly_expand_node($remainder[0], $weak_component_id); |
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$weak_component_id += 1; |
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@remainder = grep { !defined $_->{weak_component_id} } @remainder; |
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} while (@remainder > 0); |
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return $weak_component_id; |
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} |
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sub _weakly_expand_node { |
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my ($node, $weak_component_id) = @_; |
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$node->{weak_component_id} = $weak_component_id; |
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my @to_expand = ($node); |
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while (@to_expand) { |
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my $next_node = shift @to_expand; |
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my @unassigned_related_nodes = grep { !defined $_->{weak_component_id} } $next_node->related_nodes(); |
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foreach (@unassigned_related_nodes) { |
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$_->{weak_component_id} = $weak_component_id; |
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} |
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push @to_expand, @unassigned_related_nodes; |
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} |
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} |
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=head1 AUTHOR |
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Darko Obradovic, C<< >> |
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=head1 BUGS |
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Please report any bugs or feature requests to C, or through |
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the web interface at L. I will be notified, and then you'll |
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automatically be notified of progress on your bug as I make changes. |
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=head1 SUPPORT |
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You can find documentation for this module with the perldoc command. |
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perldoc SNA::Network |
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You can also look for information at: |
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=over 4 |
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100
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=item * RT: CPAN's request tracker |
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102
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L |
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=item * AnnoCPAN: Annotated CPAN documentation |
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L |
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=item * CPAN Ratings |
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L |
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112
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=item * Search CPAN |
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L |
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=back |
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=head1 ACKNOWLEDGEMENTS |
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=head1 COPYRIGHT & LICENSE |
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Copyright 2009 Darko Obradovic, all rights reserved. |
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126
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This program is free software; you can redistribute it and/or modify it |
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under the same terms as Perl itself. |
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129
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=cut |
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132
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1; # End of SNA::Network::Algorithm::Connectivity |
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