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tred(1)


NAME

   tred - transitive reduction filter for directed graphs

SYNOPSIS

   tred [ files ]

DESCRIPTION

   tred  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.   tred  is  particularly  useful as a preprocessor to dot to
   reduce clutter in dense layouts.

   Undirected graphs are silently ignored.

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.

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                         TRED(1)



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