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1 .TH TRED 1 "21 March 2001"
2 .SH NAME
3 tred \- transitive reduction filter for directed graphs
4 .SH SYNOPSIS
5 .B tred
6 [
7 .I files
8 ]
9 .SH DESCRIPTION
10 .B tred
11 computes the transitive reduction of directed graphs,
12 and prints the resulting graphs to standard output.
13 This removes edges implied by transitivity.
14 Nodes and subgraphs are not otherwise affected.
15 The ``meaning'' and validity of the reduced graphs
16 is application dependent.
17 .B tred
18 is particularly useful as a preprocessor to
19 .I dot
20 to reduce clutter in dense layouts.
21 .PP
22 Undirected graphs are silently ignored.
23 .SH OPERANDS
24 The following operand is supported:
25 .TP 8
26 .I files
27 Names of files containing 1 or more graphs in dot format.
28 If no
29 .I files
30 operand is specified,
31 the standard input will be used.
32 .SH "BUGS"
33 Using bitmaps internally would substantially decrease running time.
34 .SH "DIAGNOSTICS"
35 If a graph has cycles, its transitive reduction is not uniquely defined.
36 In this case \fItred\fP emits a warning.
37 .SH AUTHORS
38 Stephen C. North <north@research.att.com>
39 .br
40 Emden R. Gansner <erg@research.att.com>
41 .SH "SEE ALSO"
42 gc(1), dot(1), acyclic(1), gvpr(1), gvcolor(1), ccomps(1), sccmap(1), libgraph(3)