## 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 |