acyclic - make directed graph acyclic
] [ -o outfile
] [ file
is a filter that takes a directed graph as input and outputs a
copy of the graph with sufficient edges reversed to make the graph acyclic.
The reversed edge inherits all of the attributes of the original edge. The
optional file argument specifies where the the input graph is stored; by
default, the program reads from stdin
The following options are supported:
- No output is produced, though the return value will
indicate whether the graph is acyclic or not.
- Print information about whether the file is acyclic, has a
cycle or is undirected.
- -o outfile
- causes the output to be written to the specified file; by
default, output is written to stdout.
- option causes the program to print usage information.
if the graph is acyclic; 1
if the graph
has a cycle; 2
if the graph is undirected; and 255
if there are
If the graph is strict and there is a cycle of length 2, the attributes of the
reversed edge are lost.
Some edge attributes are non-symmetric, referring to either the head or tail
node. At present, there is no mechanism or convention for correctly switching
or renaming these.
Stephen C. North <firstname.lastname@example.org>
Emden R. Gansner <email@example.com>
gc(1), dot(1), gvpr(1), gvcolor(1), ccomps(1), sccmap(1), tred(1),