ccomps


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

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

OPTIONS
       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  sub-
              graph 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

              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.

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.

RETURN CODES
       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 sin-
       gle component, ccomps returns 0 on success and  non-zero  if  an  error
       occurred.

BUGS
       It is possible, though unlikely, that the names used for connected com-
       ponents and their subgraphs may conflict with existing subgraph names.

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),  acyclic(1),  sccmap(1),  tred(1),
       libgraph(3)



                                 30 April 2011                       CCOMPS(1)
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