Hi,
To compute the sparse matrix inverse M^{-1} you would have to use a direct
solver such as SparseDirectUMFPACK
<https://dealii.org/9.0.0/doxygen/deal.II/classSparseDirectUMFPACK.html>. If
this operation (M^{-1})N appears in the context of matrix-vector products, i.e.
you’re actually computing something like y = (M^{-1})Nx then you could use an
iterative solver
<https://dealii.org/9.0.0/doxygen/deal.II/classSolverSelector.html> to invert
the system My = (Nx) = b. Here you could be computing the solution y = M^{-1}b
using an iterative method.
I hope that this helps.
Best,
Jean-Paul
> On 14 Nov 2018, at 03:01, FU <fudanyang1...@gmail.com> wrote:
>
> (M^-1)N,
> M and N are sparse matrix,
> so how to get the inverse of a sparse matrix?
>
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