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dijkstra(1)


NAME

   dijkstra - single-source distance filter

SYNOPSIS

   dijkstra [ -adp?  ] [ sourcenode file ]

DESCRIPTION

   dijkstra reads a stream of graphs and for each computes the distance of
   every node from sourcenode.  Edge length is given in the len attribute,
   and  the  default is 1.  The dist attribute of every node is set to its
   distance from sourcenode.  If the -p flag is used, the  prev  attribute
   of  each  node  reachable  from  sourcenode  is  set to the name of the
   previous node on a shortest path.  The graph attribute maxdist  is  set
   to the maximum dist of all nodes in the graph.

   If  the  -d  flag  is  used,  the graph is treated as directed and only
   forward edges are used.

   By default, if the graph is disconnected, the dist attribute  of  nodes
   unreachable  from  sourcenode are left untouched, and maxdist is set to
   the maximum of any previous value and the largest distance recorded  in
   this run. On the other hand, if the -a flag is used, the dist attribute
   of an unreachable node is assigned a  very  large  value,  and  maxdist
   records   the  maximum  distance  found  in  the  component  containing
   sourcenode.

   Any number of sourcenode file pairs may be given.  If the last file  is
   missing, stdin is used.  All output is written to stdout.

   In  a  typical  application,  dist  and  maxdist can drive a downstream
   calculation of color or some other attribute.

SEE ALSO

   gvpr(1), gvcolor(1), libgraph(3)

                             21 March 2001                     DIJKSTRA(1)



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