methods on adjacency matrix

[Fredrik Bengzon]

Hi,
I'm trying to minimize my code managing a finite element mesh and 
thought of using the adjacency matrix type. Is there a list of methods 
working on this matrix type anywhere in the documentation? I want to 
store the node-to-element information in such a matrix and then use the 
MatGetSubMatrices and MatGetRow methods. Is this possible? Thanks.
/Fredrik Bengzon