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1 .TH SCCMAP 1 "21 March 2001" \*(eX
2 .SH NAME
3 sccmap \- extract strongly connected components of directed graphs
4 .SH SYNOPSIS
5 \fBsccmap\fR
6 [\fB\-dsv\fR]
7 [
8 .I files
9 ]
10 .SH DESCRIPTION
11 .I sccmap
12 decomposes digraphs into strongly connected components
13 and an auxiliary map of the relationship between components.
14 In this map, each component is collapsed into a node.
15 The resulting graphs are printed to standard out.
16 The number of nodes, edges and strongly connected components
17 are printed to standard error.
18 .B sccmap
19 is a way of partitioning large graphs into more manageable pieces.
20 .SH OPTIONS
21 The following options are supported:
22 .TP
23 .B \-d
24 Preserve degenerate components of only one node.
25 .TP
26 .B \-s
27 Do not print the resulting graphs. Only the statistics are
28 important.
29 .TP
30 .B \-S
31 Just print the resulting graphs. No statistics are printed.
32 .TP
33 .B \-v
34 Generate additional statistics. In particular,
35 .B sccmap
36 prints the number of nodes, edges, connected components,
37 and strongly connected components, followed by the fraction of
38 nodes in a non-trivial strongly connected components,
39 the maximum degree of the graph, and fraction of non-tree edges
40 in the graph.
41 .SH OPERANDS
42 The following operand is supported:
43 .TP 8
44 .I files
45 Names of files containing 1 or more graphs in dot format.
46 If no
47 .I files
48 operand is specified,
49 the standard input will be used.
50 .SH "DIAGNOSTICS"
51 \fBsccmap\fP emits a warning if it encounters an undirected graph,
52 and ignores it.
53 .SH AUTHORS
54 Stephen C. North <north@research.att.com>
55 .br
56 Emden R. Gansner <erg@research.att.com>
57 .SH "SEE ALSO"
58 gc(1), dot(1), acyclic(1), gvpr(1), gvcolor(1), ccomps(1), tred(1), libgraph(3)