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**NAME**

sccmap - extract strongly connected components of directed graphs

**SYNOPSIS**

sccmap[-dsv] [-ooutfile] [files]

**DESCRIPTION**

sccmapdecomposes 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.sccmapis a way of partitioning large graphs into more manageable pieces.

**OPTIONS**

The following options are supported:-dPreserve degenerate components of only one node.-sDo not print the resulting graphs. Only the statistics are important.-SJust print the resulting graphs. No statistics are printed.-ooutputPrints output to the fileoutput. If not given,sccmapuses stdout.-vGenerate additional statistics. In particular,sccmapprints 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.

**OPERANDS**

The following operand is supported:filesNames of files containing 1 or more graphs in dot format. If nofilesoperand is specified, the standard input will be used.

**DIAGNOSTICS**

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

**AUTHORS**

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

**SEE** **ALSO**

gc(1), dot(1), acyclic(1), gvpr(1), gvcolor(1), ccomps(1), tred(1), libgraph(3) 21 March 2001 SCCMAP(1)