I am trying to read
http://www.dis.uniroma1.it/challenge9/data/USA-road-d/USA-road-d.NY.gr.gz
in python. I have unzipped it and then I run
#!/usr/bin/python
fname = "NY.gr"
from igraph import *
g = Graph.Read_DIMACS(fname)
This gives me
Traceback (most recent call last):
File "./ashleyconcert.py", line 4, in <module>
g = Graph.Read_DIMACS(fname)
File "/usr/lib/python2.7/dist-packages/igraph/__init__.py", line
1624, in Read_DIMACS
graph, source, target, cap = super(Graph, cls).Read_DIMACS(f, directed)
igraph._igraph.InternalError: Error at foreign.c:820: 'a' lines are
allowed only in MAX problem files, Parse error
What is igraph expecting as input?
Raphael
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