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

[Mark Adams]

No. I missed that note.
Complex has not been implemented.


On Thu, Jul 14, 2022 at 9:54 AM feng wang <snailsoar at hotmail.com> wrote:

> Hi Mark,
>
> Thanks for your reply!
>
> Maybe I have a misunderstanding of the documentation of KSPComputeRitz (
> https://petsc.org/main/docs/manualpages/KSP/KSPComputeRitz/).  It says
> "-this is currently not implemented when PETSc is built with complex
> numbers".
>
> But if it works, I will give it a try.
>
> Thanks,
> Feng
>
>
>  <https://petsc.org/main/docs/manualpages/KSP/KSPComputeRitz/>
>
>
> ------------------------------
> *From:* Mark Adams <mfadams at lbl.gov>
> *Sent:* 14 July 2022 12:23
> *To:* feng wang <snailsoar at hotmail.com>
> *Cc:* petsc-users at mcs.anl.gov <petsc-users at mcs.anl.gov>
> *Subject:* Re: [petsc-users] KSPComputeRitz, GMRES, matrix with complex
> number
>
> 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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