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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
       connected 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 connected  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)