On Mon, Sep 5, 2011 at 4:08 PM, Kristen Eisenberg < kristen.eisenberg at yahoo.com> wrote:
> [petsc-users] SLEPc generalized eigenvalue problem question? > > I create 2 matrices using: > > MatCreateSeqDense(PETSC_COMM_SELF, n, n, Ka, &A); > MatCreateSeqDense(PETSC_COMM_SELF, n, n, Kb, &B); > These matrices are 99% zeros ( 16,016,004 entries and 18660 non-zeros). > They are symmetric and real. Their tri-diagonal elements are non-zero plus > a few other entries. > You would get better performance and use less memory if you made these matrices of type MATAIJ. Matt > I tried to use ex7 for the generalized eigenvalue problem: > > ./ex7.exe -f1 k.dat -f2 m.dat -eps_gen_hermitian -eps_smallest_real > x.out > 2>&1 > > without specifying an EPS and get: > > Generalized eigenproblem stored in file. > > Reading REAL matrices from binary files... > Number of iterations of the method: 500 > Number of linear iterations of the method: 4009 > Solution method: krylovschur > > Number of requested eigenvalues: 1 > Stopping condition: tol=1e-07, maxit=500 > Number of converged approximate eigenpairs: 0 > > Is krylovschur inappropriate for this problem or have I set up the problem > incorrectly by using MatCreateSeqDense(...) to create the matrix input > files in PETSc binary form? > > Kristen Eisenberg > Billige Fl?ge Marketing GmbH > Emanuelstr. 3, > 10317 Berlin > Deutschland > Telefon: +49 (33) 5310967 > Email: utebachmeier at gmail.com > Site: http://flug.airego.de - Billige Fl?ge vergleichen > -- What most experimenters take for granted before they begin their experiments is infinitely more interesting than any results to which their experiments lead. -- Norbert Wiener -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.mcs.anl.gov/pipermail/petsc-users/attachments/20110905/e2e29c12/attachment.htm>
