nullspaces

[Yaron Kretchmer]

Hi all
I have a matrix representing electrical currents (KCL). In my design, there
are some elements which are totally isolated from the rest of the circuit,
which means that they form the matrix's nullspace.

My questions are:
*) Can I use Petsc to derive the nodes which compose the nullspace
*) Can I then remove them from the KSP? If so, how?

Thanks much
Yaron
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