[petsc-users] having issues with nullspace

[Mohammad Mirzadeh]

hummm just tried it in Matlab and you are correct -- they are different.
What does this mean for my system? Also what is the correct approach here?


On Thu, Mar 6, 2014 at 4:02 PM, Jed Brown <jed at jedbrown.org> wrote:

> Mohammad Mirzadeh <mirzadeh at gmail.com> writes:
>
> > Jed,
> >
> > No the matrix is actually non-symmetric due to grid adaptivity (hanging
> > nodes of QuadTree). Anyway, what do you exactly mean by the system being
> > inconsistent?
>
> Sounds like the right and left null spaces are different.  You can test
> by checking the null space using the transpose of your system.
>
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