On Feb 23, 2013, at 1:32 PM, Matthew Knepley wrote: > On Sat, Feb 23, 2013 at 7:29 AM, Hui Zhang <mike.hui.zhang at hotmail.com> > wrote: > I want to implement diagonal penalty method for enforcing the Dirichlet > boundary conditions. That is, the diagonal entries corresponding to > Dirichlet boundary are going to be scaled by a large number. > > What is the easiest way to do this? Thanks! > > http://www.mcs.anl.gov/petsc/petsc-dev/docs/manualpages/Mat/MatDiagonalScale.html
But it seems not what I want. That routine scales all the entries of a mat. I want to scale only the diagonal entries. > > Matt > > -- > What most experimenters take for granted before they begin their experiments > is infinitely more interesting than any results to which their experiments > lead. > -- Norbert Wiener
