dolfin team mailing list archive

["Matthew Knepley" <knepley@xxxxxxxxx>]

On Nov 27, 2007 9:33 AM, Anders Logg <logg@xxxxxxxxx> wrote:
> On Tue, Nov 27, 2007 at 04:30:43PM +0100, Thomas Witkowski wrote:
> > Hi,
> >
> > I want to use dolfin for solving eigenvalue problems. I've installed
> > dolfin 0.7.1 with petsc and slepc. The matrix, for which the eigenvalues
> > should be computed, is defined in the following way:
> >
> > PETScMatrix C(TS, TS);
> > C.set(.....);
> > C.set(.....);
>
> Try calling
>
>   C.apply();

Why change the name from assemble()? You even used it in your description,
and apply() is easily confused with operator application.

  Matt

> after the set functions.
>
> PETSc needs to "assemble" the changes you made when calling set()
> before you can do anything with the matrix.
>
> --
> Anders
>
>
>
> > Now, when I'm trying to solve the problem with:
> >
> >  SLEPcEigenvalueSolver esolver;
> >  esolver.solve(C);
> >
> > I get the following error message:
> >
> >
> > [0]PETSC ERROR: --------------------- Error Message
> > ------------------------------------
> > [0]PETSC ERROR: Object is in wrong state!
> > [0]PETSC ERROR: Not for unassembled matrix!
> > [0]PETSC ERROR:
> > ------------------------------------------------------------------------
> > [0]PETSC ERROR: Petsc Release Version 2.3.3, Patch 8, Fri Nov 16
> > 17:03:40 CST 2007 HG revision: 414581156e67e55c761739b0deb119f7590d0f4b
> > [0]PETSC ERROR: See docs/changes/index.html for recent updates.
> > [0]PETSC ERROR: See docs/faq.html for hints about trouble shooting.
> > [0]PETSC ERROR: See docs/index.html for manual pages.
> > [0]PETSC ERROR:
> > ------------------------------------------------------------------------
> > [0]PETSC ERROR: ./mass on a linux-gnu named ... by witkowsk Tue Nov 27
> > 16:17:51 2007
> > [0]PETSC ERROR: Libraries linked from
> > /u/witkowski/local/petsc-2.3.3-p8/lib/linux-gnu-cxx
> > [0]PETSC ERROR: Configure run at Tue Nov 27 11:24:27 2007
> > [0]PETSC ERROR: Configure options --with-mpi-dir=/u/witkowski/local
> > --with-clanguage=cxx --download-hypre=yes --with-hypre=1
> > --download-umfpack=yes --with-umfpack=1 --with-shared=0
> > [0]PETSC ERROR:
> > ------------------------------------------------------------------------
> > [0]PETSC ERROR: MatMult() line 1616 in src/mat/interface/matrix.c
> > [0]PETSC ERROR: STApply_Shift() line 30 in src/st/impls/shift/shift.c
> > [0]PETSC ERROR: STApply() line 49 in src/st/interface/stsolve.c
> > [0]PETSC ERROR: EPSBasicArnoldi() line 86 in src/eps/impls/arnoldi/arnoldi.c
> > [0]PETSC ERROR: EPSSolve_KRYLOVSCHUR() line 91 in
> > src/eps/impls/krylovschur/krylovschur.c
> > [0]PETSC ERROR: EPSSolve() line 71 in src/eps/interface/solve.c
> > Eigenvalue solver (krylovschur) converged in 1 iterations.
> >
> >
> > What does it meen? And what have I made wrong?
> >
> > Regards,
> >
> > Thomas
> > _______________________________________________
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> > DOLFIN-dev@xxxxxxxxxx
> > http://www.fenics.org/mailman/listinfo/dolfin-dev
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What most experimenters take for granted before they begin their
experiments is infinitely more interesting than any results to which
their experiments lead.
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