Is there a way to provide graph coordinates?

[Anirban Chatterjee]

Hi,

Is there a way to provide coordinates to the nodes of a graph/matrix 
when declaring it?
I have the adjacency matrix and want to provide (x y) coordinates to the 
nodes of the adjacency graph corresponding to the matrix.
How do I do this in PETSc? I want to use a geometric partitioner on this 
adjacency matrix.

Thanks,
Anirban