unixdev.net


Switch to SpeakEasy.net DSL

The Modular Manual Browser

Home Page
Manual: (Debian-5.0)
Page:
Section:
Apropos / Subsearch:
optional field

CCOMPS(1)                   General Commands Manual                  CCOMPS(1)



NAME
       ccomps - connected components filter for graphs

SYNOPSIS
       ccomps [ -sxv?  ] [ -ooutfile ] [ files ]

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

OPTIONS
       The following options are supported:

       -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.

       -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# index
              Prints only component number index, if any, starting at 0.

       -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 "_component_" 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 <northATresearch.com>
       Emden R. Gansner <ergATresearch.com>

SEE ALSO
       gc(1),  dot(1),  gvpr(1),  gvcolor(1),  acyclic(1), sccmap(1), tred(1),
       libgraph(3)



                                 21 March 2001                       CCOMPS(1)