ccomps - connected components filter for graphs


   ccomps [ -sxvenzC?  ] [ -X[#%]s[-f] ] [ -ooutfile ] [ files ]


   ccomps  decomposes graphs into their connected components, printing the
   components to standard output.


   The following options are supported:

   -e     Do not induce edges in the connected components.

   -s     No output graph is printed. The return  value  can  be  used  to
          check if the graph is connected or not.

   -x     Only the connected components are printed, as separate graphs.

   -v     Counts of nodes, edges and connected components are printed.

   -z     Sort  components  by  size, with the largest first. This is only
          effective if either -x or -X#  is  present.   Thus,  -zX#0  will
          cause the largest component to be printed.

   -C     Use  clusters in computing components in addition to normal edge
          connectivity. In essence, this gives the connected components of
          the derived graph in which nodes top-level clusters and nodes in
          the original graph. This maintains all subgraph structure within
          a component, even if a subgraph does not contain any nodes.

   -n     Do  not project subgraph structure. Normally, if ccomps produces
          components as graphs distinct from  the  input  graph,  it  will
          define subgraphs which are projections of subgraphs of the input
          graph onto the  component.  (If  the  projection  is  empty,  no
          subgraph  is  produced.)   If  this  flag  is set, the component
          contains only the relevant nodes and edges.

   -X node_name
          Prints only the component containing the node node_name, if any.

   -X# start

   -X# start-
   -X# start-last
          Prints only components in the given range  of  indices.  In  the
          first  form, only the component whose index is start, if any, is
          printed.  In the second form, each component whose index  is  at
          least  start is printed. In the last form, only those components
          whose indices are in the range [Istart,last] are printed.  Thus,
          the flag -x is equivalent to -X#0-.

   -X# min

   -X# min-
   -X# min-max
          Prints only components in the given range of sizes. In the first
          form, only a component whose size is min, if  any,  is  printed.
          In the second form, each component whose size is at least min is
          printed. In the last form, only those components whose sizes are
          in the range [Imin,max] are printed.

   -o outfile
          If  specified,  each  graph  will be written to a different file
          with the names derived from outfile. In particular, if  both  -o
          and  -x flags are used, then each connected component is written
          to a different file. If outfile does  not  have  a  suffix,  the
          first file will have the name outfile; then next outfile_1, then
          next outfile_2, and so on.  If outfile has a suffix,  i.e.,  has
          the  form  base.sfx,  then  the  files  will  be named base.sfx,
          base_1.sfx, base_2.sfx, etc.

   By default, each input graph is printed, with each connected  component
   given  as  a  subgraph whose name is a concatenation of the name of the
   input graph, the string "_cc_" and the number of the component.


   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.


   Unless  used  to extract a single connected component, ccomps returns 0
   if all the input graphs are connected; and non-zero if  any  graph  has
   multiple  components,  or  any  error  occurred.   If just extracting a
   single component, ccomps returns 0 on success and non-zero if an  error


   It  is  possible,  though  unlikely,  that the names used for connected
   components and their subgraphs  may  conflict  with  existing  subgraph


   Stephen C. North <>
   Emden R. Gansner <>


   gc(1),  dot(1),  gvpr(1),  gvcolor(1),  acyclic(1), sccmap(1), tred(1),

                             30 April 2011                       CCOMPS(1)


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