perfect_match arcost ordering?

[Qasim Javed]

Hi all,

I am trying to use perfect match.

According to the documentation arcost should be the costs associated 
with ARCs which makes the number double the number of edges in the 
undirected graph. Keep in mind that perfect_match only accepts 
undirected graphs as input.

What I am unable to figure out is that what order should I specify the 
costs in? Lets say I have 24 edges so that size of arcost needs to be 
48. Once I specify the cost of the edges in the same sequence as I 
specified the edges, I then have 24 arcs with costs. What order should I 
follow for the other direction?

Thanks,
Qasim