acyclic(1) [debian man page]

ACYCLIC(1)						      General Commands Manual							ACYCLIC(1)

NAME

       acyclic - make directed graph acyclic

SYNOPSIS

       acyclic [ -nv?  ] [ -o outfile ] [ file ]

DESCRIPTION

       acyclic	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.

OPTIONS

       The following options are supported:

       -n     No output is produced, though the return value will indicate whether the graph is acyclic or not.

       -v     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.

RETURN CODES

       acyclic returns 0 if the graph is acyclic; 1 if the graph has a cycle; 2 if the graph is undirected; and 255 if there are any errors.

BUGS

       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 cor-
       rectly switching or renaming these.

AUTHORS

       Stephen C. North <north@research.att.com>
       Emden R. Gansner <erg@research.att.com>

SEE ALSO

       gc(1), dot(1), gvpr(1), gvcolor(1), ccomps(1), sccmap(1), tred(1), libgraph(3)

								   21 March 2001							ACYCLIC(1)

SCCMAP(1)                                                     General Commands Manual                                                    SCCMAP(1)

NAME

       sccmap - extract strongly connected components of directed graphs

SYNOPSIS

       sccmap [-dsv] [ -ooutfile ] [ files ]

DESCRIPTION

       sccmap  decomposes  digraphs  into strongly connected components and an auxiliary map of the relationship between components.  In this map,
       each component is collapsed into a node.  The resulting graphs are printed to standard out.  The number of nodes, edges and  strongly  con-
       nected components are printed to standard error.  sccmap is a way of partitioning large graphs into more manageable pieces.

OPTIONS

       The following options are supported:

       -d     Preserve degenerate components of only one node.

       -s     Do not print the resulting graphs. Only the statistics are important.

       -S     Just print the resulting graphs. No statistics are printed.

       -ooutput
              Prints output to the file output. If not given, sccmap uses stdout.

       -v     Generate  additional  statistics.  In  particular, sccmap prints the number of nodes, edges, connected components, and strongly con-
              nected components, followed by the fraction of nodes in a non-trivial strongly connected  components,  the  maximum  degree  of  the
              graph, and fraction of non-tree edges in the graph.

OPERANDS

       The following operand is supported:

       files   Names of files containing 1 or more graphs in dot format.  If no files operand is specified, the standard input will be used.

DIAGNOSTICS

       sccmap emits a warning if it encounters an undirected graph, and ignores it.

AUTHORS

       Stephen C. North <north@research.att.com>
       Emden R. Gansner <erg@research.att.com>

SEE ALSO

       gc(1), dot(1), acyclic(1), gvpr(1), gvcolor(1), ccomps(1), tred(1), libgraph(3)

                                                                   21 March 2001                                                         SCCMAP(1)