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

[feng wang]

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