dijkstra

DIJKSTRA(1)                 General Commands Manual                DIJKSTRA(1)

NAME
       dijkstra - single-source distance filter for Graphviz

SYNOPSIS
       dijkstra [ -adp?  ] [ sourcenode file ]

DESCRIPTION
       dijkstra  reads a stream of Graphviz formatted graphs and for each com-
       putes the distance of every node from sourcenode.  Edge length is given
       in  the len attribute, and the default is 1.  The dist attribute of ev-
       ery 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  attri-
       bute 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 for-
       ward 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 cal-
       culation of color or some other attribute.

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

                                 21 March 2001                     DIJKSTRA(1)