Direct solver matrix.free

[Joss G.]

Hi all, 

I was using the solver PETScWrappers::SparseDirectMUMPS for a sparse matrix approach. Now I am changing the code to a matrix-free implementation and I am not using PETSc anymore, instead, I use LinearAlegebra::distributed::Vector<number>. I am not able to find an equivalent direct solver that I can use. Could anyone please point me what solver can i use?

Thank you very much.

[Daniel Arndt]

Joss,

The MatrixFree framework relies on the operator to be only defined by its action. Accessing individual elements (as direct solvers typically require) falls out of this concept. That is to say that the MatrixFree framework only works well with an iterative solver.

Best,

Daniel

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