PETSc sparsity

[Barry Smith]

   Satish,

  Yes, we should change the default in petsc-dev (not release) for
consistency.

   Barry

On Sat, 16 Jun 2007, Satish Balay wrote:

> With petsc-2.3.3 the default behavior is changed for Vec [to give
> error on -ve indices]. However this can be enabled with the following:
> 
> VecsetOption(vec,VEC_IGNORE_NEGATIVE_INDICES)
> 
> Perhaps we should do the same with Mat.
> 
> Satish
> 
> On Sat, 16 Jun 2007, Mark Adams wrote:
> 
> > Thats nice to know that negative indices are ignored. convenient.
> 
> > On Jun 15, 2007, at 10:13 PM, Matthew Knepley wrote:
> > 
> > > Also, I have talked to Wolfgang many times about this. I am a firm
> > > believer in eliminating the boundary values during assembly at the
> > > element level. PETSc provides an easy mechanism for this. By default,
> > > all negative indices in calls to VecSetValues and MatSetValues are
> > > ignored.
> 
>