Oh, I see the stack trace now. This requires to compute the inertia?
> On Nov 19, 2021, at 3:45 PM, Stefano Zampini <[email protected]>
> wrote:
>
> Jose
>
> Now that we have the PCMatApply interface, you could switch to use that
> inside SLEPc. I guess you are using MatSolve, right?
> If not, the alternative is to have a PCFactorGetMatrix with creates on the
> fly an object that behaves like it. The problem is that we do not have a
> matching restore, and the new object created will be leaked.
> What do you think?
>
>
>> On Nov 19, 2021, at 12:41 PM, Jose E. Roman <[email protected]> wrote:
>>
>> It is trying to call PCFactorGetMatrix() on your PC, but this operation is
>> not supported by PCSHELL and it is not possible to set it via
>> PetscObjectComposeFunction(). PCSHELL uses the PCShellSet* interface, that
>> is restricted to a limited number of operations.
>>
>> Jose
>>
>>
>>> El 19 nov 2021, a las 6:30, Sam Guo <[email protected]> escribió:
>>>
>>> Dear PETSc dev team,
>>> I am implementing SLEPc interval option using shell matrix as follows:
>>>
>>> EPSGetST(eps, &st);
>>> STSetType(st, STSINVERT);
>>> STGetKSP(st, &ksp);
>>> KSPSetOperators(ksp, A, A);
>>> KSPSetType(ksp, KSPPREONLY);
>>> KSPGetPC(ksp, &pc);
>>> KSPGetPC(ksp, &pc)
>>> MatSetOption(A, MAT_SPD, PETSC_TRUE);
>>> PCSetType(pc, PCSHELL);
>>> PCShellSetContext(pc, &appCtx);
>>> PCShellSetApply(pc, applyPreconditioner);
>>> PetscObjectComposeFunction((PetscObject)pc,"PCFactorGetZeroPivot_C",PCFactorGetZeroPivot_C);
>>>
>>> When I run it, I get the following error. Any idea what I did wrong?
>>> Thanks a lot for your help.
>>>
>>> [0]PETSC ERROR: No support for this operation for this object type
>>> [0]PETSC ERROR: PC type does not support getting factor matrix
>>> [0]PETSC ERROR: See http://www.mcs.anl.gov/petsc/documentation/faq.html for
>>> trouble shooting.
>>> [0]PETSC ERROR: Petsc Release Version 3.11.3, Jun, 26, 2019
>>> [0]PETSC ERROR: Unknown Name on a arch-starccmplus_serial_real named
>>> pl2usbvu0037pc.net.plm.eds.com by cd4hhv Thu Nov 18 21:11:45 2021
>>> Number of iterations of the method: 0
>>> [0]PETSC ERROR: Configure options --with-x=0 --with-fc=0 --with-debugging=1
>>> --with-blaslapack-dir=/u/cd4hhv/dev2/mkl/2017.2-cda-001/linux/lib/intel64/../..
>>> --with-mpi=0 -CFLAGS=-g -CXXFLAGS=-g --with-clean=1 --force
>>> --with-scalar-type=real
>>> [0]PETSC ERROR: #1 PCFactorGetMatrix() line 1332 in
>>> ../../../petsc/src/ksp/pc/interface/precon.c
>>> [0]PETSC ERROR: #2 EPSSliceGetInertia() line 340 in
>>> ../../../slepc/src/eps/impls/krylov/krylovschur/ks-slice.c
>>> [0]PETSC ERROR: #3 EPSSetUp_KrylovSchur_Slice() line 467 in
>>> ../../../slepc/src/eps/impls/krylov/krylovschur/ks-slice.c
>>> [0]PETSC ERROR: #4 EPSSetUp_KrylovSchur() line 146 in
>>> ../../../slepc/src/eps/impls/krylov/krylovschur/krylovschur.c
>>> [0]PETSC ERROR: #5 EPSSetUp() line 173 in
>>> ../../../slepc/src/eps/interface/epssetup.c
>>> Solution method: krylovschur
>>> [0]PETSC ERROR: #6 EPSSliceGetEPS() line 306 in
>>> ../../../slepc/src/eps/impls/krylov/krylovschur/ks-slice.c
>>> [0]PETSC ERROR: #7 EPSSetUp_KrylovSchur_Slice() line 416 in
>>> ../../../slepc/src/eps/impls/krylov/krylovschur/ks-slice.c
>>> [0]PETSC ERROR: #8 EPSSetUp_KrylovSchur() line 146 in
>>> ../../../slepc/src/eps/impls/krylov/krylovschur/krylovschur.c
>>> [0]PETSC ERROR: #9 EPSSetUp() line 173 in
>>> ../../../slepc/src/eps/interface/epssetup.c
>>
>
