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package SNA::Network::Algorithm::Cores; |
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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(calculate_in_ccs); |
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=head1 NAME |
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SNA::Network::Algorithm::Cores - calculate core collapse sequences (CCS) |
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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 $k_max = $net->calculate_in_ccs(); |
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=head1 METHODS |
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The following methods are added to L. |
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=head2 calculate_in_ccs |
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Calculates the in-core collapse sequence of the graph. |
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All nodes get a maximum core membership k, starting from 0 on. |
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Stores the k value under the hash entry B for each node object. |
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Returns the maximum k in the network. |
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=cut |
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sub calculate_in_ccs { |
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my ($self) = @_; |
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foreach ($self->nodes) { |
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undef $_->{k_in_core}; |
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$_->{_open_pres} = int $_->incoming_nodes; |
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} |
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my $k = 0; |
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my @open = $self->nodes; |
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do { |
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$k += 1; |
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my @recheck = (); |
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foreach my $node (@open) { |
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if ($node->{_open_pres} < $k) { |
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$node->{k_in_core} = $k - 1; |
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foreach ($node->outgoing_nodes) { |
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$_->{_open_pres} -= 1; # unless $_->{k_in_core}; |
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} |
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push @recheck, $node->outgoing_nodes; |
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#TODO check with smaller id only |
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} |
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} |
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RECHECK: |
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while (@recheck) { |
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my $node = shift @recheck; |
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next RECHECK if defined $node->{k_in_core}; |
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if ($node->{_open_pres} < $k) { |
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$node->{k_in_core} = $k - 1; |
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foreach ($node->outgoing_nodes) { |
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$_->{_open_pres} -= 1; # unless $_->{k_in_core}; |
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} |
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push @recheck, $node->outgoing_nodes; |
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} |
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} |
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@open = grep { !defined $_->{k_in_core} } @open; |
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} while (@open); |
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return $k - 1; |
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} |
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#TODO try counting |
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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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=item * RT: CPAN's request tracker |
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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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=item * Search CPAN |
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L |
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=back |
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=head1 ACKNOWLEDGEMENTS |
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136
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=head1 COPYRIGHT & LICENSE |
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Copyright 2009 Darko Obradovic, all rights reserved. |
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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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=cut |
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1; # End of SNA::Network::Algorithm::Cores |
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