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TRED(1) General Commands Manual TRED(1)

NAME

tred - transitive reduction filter for directed graphs

SYNOPSIS

tred [ -ovr? ] [ files ]

DESCRIPTION

tred computes the transitive reduction of directed graphs, and prints the resulting graphs to a file or standard output. This removes edges implied by transitivity. Nodes and subgraphs are not otherwise affected. The ``meaning'' and validity of the reduced graphs is application dependent. tred is particularly useful as a preprocessor to dot to reduce clutter in dense layouts.

Undirected graphs are silently ignored.

OPTIONS

The following options are supported:

Redirect output to the given file. By default, output goes to stdout.
Verbose output to stderr.
Print information of removed edges to stderr.
-?
Print usage information.

OPERANDS

The following operand is supported:

Names of files containing 1 or more graphs in dot format. If no files operand is specified, the standard input will be used.

BUGS

Using bitmaps internally would substantially decrease running time.

DIAGNOSTICS

If a graph has cycles, its transitive reduction is not uniquely defined. In this case tred emits a warning.

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), sccmap(1), libgraph(3)

21 March 2001