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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
   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)



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