[petsc-users] elimination of trivial entries in a matrix

[Barry Smith]

  Dominik,

      This is handled by PCREDISTRIBUTE

   Barry

On Oct 11, 2011, at 9:06 AM, Dominik Szczerba wrote:

> My matrix has many trivial entries (A_{ii}=1, A_{i!=j}=0, b_i = b0)
> that I want to eliminate to reduce the solving time, re-inserting them
> at the end into the solution vector.
> Of course I can do it all by creating a second matrix and doing
> related book-keeping on my own, but was wondering if there is some
> functionality in Petsc to facilitate it.
> If so, I would be grateful for just a list of relevant functions to look at.
> 
> Many thanks
> Dominik