graphs: how to apply functions for GRAPH to DIGRAPH
Subject: graphs: how to apply functions for GRAPH to DIGRAPH
From: Rolf Fankhauser
Date: Sat, 08 May 2010 07:59:30 +0200
I defined a directed graph, exported and imported it in format DIMACS.
That works fine.
But if I want to check if the graph is planar with function is_planar, I
get the error "Argument 1 to 'IS_PLANAR' is not a graph: Structure
[DIGRAPH]. Why is function is_planar not applicable to DIGRAPHs ? How
can I convert my directed graph to an undirected graph?
Rolf Fankhauser