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Graph-Graph6-5
River stage one • 2 direct dependents • 2 total dependents
/ Graph::Writer::Sparse6

NAME

Graph::Writer::Sparse6 - write Graph.pm in sparse6 format

SYNOPSIS

 use Graph::Writer::Sparse6;
 my $writer = Graph::Writer::Sparse6->new;
 $writer->write_graph($graph, 'filename.txt');
 $writer->write_graph($graph, $filehandle);

CLASS HIERARCHY

Graph::Writer::Sparse6 is a subclass of Graph::Writer.

    Graph::Writer
      Graph::Writer::Sparse6

DESCRIPTION

Graph::Writer::Sparse6 writes a Graph.pm graph to a file in sparse6 format. This file format is per

The format represents an undirected graph possibly with multi-edges and self-loops. If a given $graph is directed then an edge in either direction is written. If there's edges both ways then a multi-edge is written.

There are no vertex names and no attributes in the output. In the current implementation $graph->vertices() is sorted alphabetically (sort) to give a consistent (though slightly arbitrary) vertex numbering.

See Graph::Graph6 for further notes on the formats.

FUNCTIONS

$writer = Graph::Writer::Sparse6->new ()

Create and return a new writer object.

$writer->write_graph($graph, $filename_or_fh)

Write $graph to $filename_or_fh in sparse6 format. A final newline "\n" is included so this is suitable for writing multiple graphs one after the other to a file handle.

$graph should be a Graph.pm object or something compatible. There's no check on the actual class of $graph.

BUGS

Graph.pm 0.96 had a bug on undirected multiedged graphs where its edges() method sometimes did not return all the edges of the graph, causing Graph::Writer::Sparse6 to write only those edges. Use version 0.97 for such a graph, or undirected countedged was ok.

SEE ALSO

Graph, Graph::Writer, Graph::Writer::Graph6

Graph::Graph6, nauty-showg(1), nauty-copyg(1)

HOME PAGE

http://user42.tuxfamily.org/graph-graph6/index.html

LICENSE

Copyright 2015 Kevin Ryde

Graph-Graph6 is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 3, or (at your option) any later version.

Graph-Graph6 is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with Graph-Graph6. If not, see http://www.gnu.org/licenses/.