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sccmap(1)                                                            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 std-
              out.

       -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)

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