Graph::BitMatrix(3pm)					User Contributed Perl Documentation				     Graph::BitMatrix(3pm)

NAME

       Graph::BitMatrix - create and manipulate a V x V bit matrix of graph G

SYNOPSIS

	   use Graph::BitMatrix;
	   use Graph::Directed;
	   my $g  = Graph::Directed->new;
	   $g->add_...(); # build $g
	   my $m = Graph::BitMatrix->new($g, %opt);
	   $m->get($u, $v)
	   $m->set($u, $v)
	   $m->unset($u, $v)
	   $m->get_row($u, $v1, $v2, ..., $vn)
	   $m->set_row($u, $v1, $v2, ..., $vn)
	   $m->unset_row($u, $v1, $v2, ..., $vn)
	   $a->vertices()

DESCRIPTION

       This class enables creating bit matrices that compactly describe the connected of the graphs.

   Class Methods
       new($g)
	   Create a bit matrix from a Graph $g.  The %opt, if present, can have the following options:

	   o	   connect_edges

		   If true or if not present, set the bits in the bit matrix that correspond to edges.	If false, do not set any bits.	In either
		   case the bit matrix of V x V bits is allocated.

   Object Methods
       get($u, $v)
	   Return true if the bit matrix has a "one bit" between the vertices $u and $v; in other words, if there is (at least one) a vertex going
	   from $u to $v.  If there is no vertex and therefore a "zero bit", return false.

       set($u, $v)
	   Set the bit between the vertices $u and $v; in other words, connect the vertices $u and $v by an edge.  The change does not get
	   mirrored back to the original graph.  Returns nothing.

       unset($u, $v)
	   Unset the bit between the vertices $u and $v; in other words, disconnect the vertices $u and $v by an edge.	The change does not get
	   mirrored back to the original graph.  Returns nothing.

       get_row($u, $v1, $v2, ..., $vn)
	   Test the row at vertex "u" for the vertices "v1", "v2", ..., "vn" Returns a list of n truth values.

       set_row($u, $v1, $v2, ..., $vn)
	   Sets the row at vertex "u" for the vertices "v1", "v2", ..., "vn", in other words, connects the vertex "u" to the vertices "vi".  The
	   changes do not get mirrored back to the original graph.  Returns nothing.

       unset_row($u, $v1, $v2, ..., $vn)
	   Unsets the row at vertex "u" for the vertices "v1", "v2", ..., "vn", in other words, disconnects the vertex "u" from the vertices "vi".
	   The changes do not get mirrored back to the original graph.	Returns nothing.

       vertices
	   Return the list of vertices in the bit matrix.

ALGORITHM

       The algorithm used to create the matrix is two nested loops, which is O(V**2) in time, and the returned matrices are O(V**2) in space.

AUTHOR AND COPYRIGHT

       Jarkko Hietaniemi jhi@iki.fi

LICENSE

       This module is licensed under the same terms as Perl itself.

perl v5.10.0							    2005-04-16						     Graph::BitMatrix(3pm)