Subdivide edges in a graph

[ncohen]

It is often useful to subdivide the edges of a graph, so there should be a function in Sage for this.

When an edge e between u and v is subdivided in a DiGraph?, perhaps the best thing to do would be to name the new vertices as (e, 0), (e, 1), (e, 2), etc ...

We are left with a similar problem concerning the Graphs and here I have to admit I do not know which name to use without inducing some orientation..

This being said, it has to be done ! :-)

This ticket might conflict with #7608. The patch at #7608 makes a lot of changes to sage/graphs/generic_graph.py, a module that is also touched by ncohen's patch on this ticket.

[ncohen]

Here it is !!!

Nathann

[jason]

In the docs, you say that the following are valid forms:

G.add_edge( 1, 2, 8 )

G.add_edge( (1, 2), 8 )

However, reading the code seems to indicate that it should be subdivide_edge, not add_edge.

[ncohen]

Indeed. Fixed :-)

Nathann