On Tue, 15 Dec 2009, Fergal Dalton wrote:
Thanks again,
But I'm talking about edge weights - why would you put in "get(vertex_index,g)" and not "get(edge_index,g)" or similar (I've tried
simple substitution and it doesn't work; so it's obviously more complex
this than
that)?
OK. I misread that -- you do want edge_index. You will need to provide them yourself, though. You must have some mapping from edges to numbers already to index the vector; that needs to be turned into a property map.
Exactly, that's the bit I can't understand. How do I do that? It's not a stupid question, I've been banging my head against it for 2 weeks but the documentation is full of examples far more complex than I need and I lose myself in the syntax (I'm a half-newbie to C++, which is not helping).
Create a bundled edge property in the graph (like you did for the weight map before trying the external one). Write a loop over the edges of the graph that assigns an index (in whichever way you are indexing the weight vector) to each edge, putting it as the value of that property. Then use that property map as the index map in the iterator_property_map. That should give you an edge property that is based on your vector. -- Jeremiah Willcock