## table of contents

SCCMAP(1) | General Commands Manual | SCCMAP(1) |

# NAME¶

sccmap - extract strongly connected components of directed graphs# SYNOPSIS¶

**sccmap**[

**-dsv**] [

**-o**

*outfile*] [

*files*]

# DESCRIPTION¶

*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.

# OPTIONS¶

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.
**-o***output*- 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.

# 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.

# DIAGNOSTICS¶

**sccmap**emits 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 |