[petsc-users] Differencing parameter works now

[Kontsantinos Kontzialis]

Jed,

It is ok now!

I have another question. I use the Discontinoues Galerkin discretization 
for the equations of gas dynamics. I use a matrix free formulation and 
that's why I need a very good preconditioner, which I compute it 
numerically and untill now it works ok, but it is a bit slow The 
preconditioner is just the Jacobian of the system. I wonder if PETSc has 
a built in capability to compute its entries.

Costas