[petsc-dev] Using PETSc MatIS, how to get local matrix (= one domain) before and after assembly ?

[Franck Houssen]

I have a 3x3 global matrix is built (diag: 1, 2, 1): it's made of 2 overlapping 2x2 local matrix (diag: 1, 1). 
Getting non assembled local matrix is OK with MatISGetLocalMat. 
How to get assembled local matrix (initial local matrix + neigbhor contributions on the borders) ? (expected result is diag: 2, 1) 

Franck 
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