[petsc-users] reuse a real matrix for a second linear system with complex numbers

[feng wang]

Dear All,

I am solving a coupled system. One system is AX=B. A, X and B are all real numbers and it is solved with GMRES in petsc. Now I need to solve a second linear system, it can be represented as (A+i*w)*Z=C. i is the imaginary unit.  Z and C are also complex numbers.

So the Jacobian matrix of the second system is just A plus a diagonal contribution i*w.  I would like solve the second system with GMRES, could petsc handle this? any comments are welcome.

Thanks,
Feng
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