[petsc-users] KSPComputeOperator Fortran API

[Edoardo Centofanti]

Dear users,

I am working on a finite element Fortran code and I would like to extract
the preconditioned operator to explore its spectral properties. I know that
the KSPComputeOperator routine exists in C.
How can I call it from Fortran? I am currently using PETSc 3.20.2.

So far I have tried
call KSPComputeOperator(ksp,MATMPIAIJ,AAprec,ierr)

and also its old/deprecated version
call KSPComputeExplicitOperator(ksp,AAprec,ierr)

But in both cases I got
undefined reference to `kspcomputeoperator_'/`kspcomputeexplicitoperator_'
when compiling

Thanks in advance,
Edoardo
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