PETSc sparsity

[Satish Balay]

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.