Section: User Commands (1)
Updated: 21 March 2001
tred - transitive reduction filter for directed graphs
computes the transitive reduction of directed graphs,
and prints the resulting graphs to 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.
is particularly useful as a preprocessor to
to reduce clutter in dense layouts.
Undirected graphs are silently ignored.
The following options are supported:
Verbose output to stderr.
Print information of removed edges to stderr.
Print usage information.
The following operand is supported:
Names of files containing 1 or more graphs in dot format.
operand is specified,
the standard input will be used.
Using bitmaps internally would substantially decrease running time.
If a graph has cycles, its transitive reduction is not uniquely defined.
In this case tred
emits a warning.
Stephen C. North <email@example.com
Emden R. Gansner <firstname.lastname@example.org