CLUSTER

Section: User Commands (1)
Updated: 3 March 2011
Page Index

NAME

cluster - find clusters in a graph and augment the graph with this information.

SYNOPSIS

cluster [-v?] [ -Ck ] [ -ck ] [ -o outfile ] [ files ]

DESCRIPTION

cluster takes as input a graph in DOT format, finds node clusters and augments the graph with this information. The clusters are specified by the "cluster" attribute attached to nodes; cluster values are non-negative integers. cluster attempts to maximize the modularity of the clustering. If the edge attribute "weight" is defined, this will be used in computing the clustering.

OPTIONS

The following options are supported:

-Ck: specifies a targeted number of clusters that should be generated. The specified number k is only a suggestion and may not be realisable. If k == 0, the default, the number of clusters that approximately optimizes the modularity is returned.
-ck: specifies clustering method. If k == 0, the default, modularity clustering will be used. If k == 1 modularity quality will be used.
-ooutfile: Specifies that output should go into the file outfile. By default, stdout is used.
-v: Verbose mode.
-?: Prints the usage and exits.

EXAMPLES

Applying cluster to the following graph,

   graph {
       1--2 [weight=10.]
       2--3 [weight=1]
       3--4 [weight=10.]
       4--5 [weight=10]
       5--6 [weight=10]
       3--6 [weight=0.1]
       4--6 [weight=10.]
      }

gives

   graph {
         node [cluster="-1"];
         1 [cluster=1];
         2 [cluster=1];
         3 [cluster=2];
         4 [cluster=2];
         5 [cluster=2];
         6 [cluster=2];
         1 -- 2 [weight="10."];
         2 -- 3 [weight=1];
         3 -- 4 [weight="10."];
         4 -- 5 [weight=10];
         5 -- 6 [weight=10];
         3 -- 6 [weight="0.1"];
         4 -- 6 [weight="10."];
   }

AUTHOR

Yifan Hu <yifanhu@yahoo.com>