[petsc-users] KSPComputeRitz, GMRES, matrix with complex number

[Mark Adams]

Why do you say it only works with Real? You need to configure PETSc to use
complex numbers and it should work.
This is an advanced method and it does not have any tests, which basically
says it is very experimental.
Don't expect it to be very robust.

Mark

On Thu, Jul 14, 2022 at 7:19 AM feng wang <snailsoar at hotmail.com> wrote:

> Dear All,
>
> I am using GMRES with complex numbers and would like to compute the Ritz
> values. I am looking at KSPComputeRitz
> <https://petsc.org/main/docs/manualpages/KSP/KSPComputeRitz/>  and it
> seems to me that it only works with Petsc compiled with real numbers. Is
> there an easy alternative way to compute Ritz values for matrices with
> complex numbers?
>
> Thanks,
> Feng
>
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