

 
Manual Reference Pages  GRAPH::BITMATRIX (3)
.ds Aq ’
NAME
Graph::BitMatrix  create and manipulate a V x V bit matrix of graph G
CONTENTS
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 v5.20.3  GRAPH::BITMATRIX (3)  20050416 
Visit the GSP FreeBSD Man Page Interface. Output converted with manServer 1.07. 