sccmap

Extract strongly connected components of one or more directed graphs

$ sccmap -S [path/to/input1.gv] [path/to/input2.gv ...] > [path/to/output.gv]

$ sccmap -v -s [path/to/input1.gv] [path/to/input2.gv ...]

$ sccmap -?

sccmap [-dsSv] [ -ooutfile ] [ files ]

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.

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.

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.

sccmap emits a warning if it encounters an undirected graph, and ignores it.

Stephen C. North <north@research.att.com>
Emden R. Gansner <erg@research.att.com>

gc(1), dot(1), acyclic(1), gvpr(1), gvcolor(1), ccomps(1), tred(1), libgraph(3)