[petsc-users] How to do this in Petsc?

[Mengda Wu]

Hi all,

   I would like to solve a system Ax=b multiple times, with A and b stay
the same from time to time. The difference among each time is that a set of
DOFs in x are fixed and others are free to be solved. And the set of DOFs
to be fixed/ solved varies from time to time. I know I can assemble A each
time and move the set of fixed DOFs to the rhs. But I don't want to do this
because the size of A is changing.

   Is there a simpler and more automated way to deal with this issue?

Thanks,
Guanglei
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