[petsc-users] question about extracting numbers from a matrix

[Jed Brown]

Michael Povolotskyi <mpovolot at purdue.edu> writes:

> Hello everybody,
> I have a sparse matrix defined on 1 MPI process.
> I want to extract all entries from it (including zeros) and put them 
> into an array to use as an argument for some lapack functions.
> What is the most optimal way of doing this?

Mat A_dense;
PetscScalar a;
MatConvert(A,MATDENSE,MAT_INITIAL_MATRIX,&A_dense);
MatDenseGetArray(A_dense,&a);
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