[petsc-users] Problem with Finding Eigenvalues using SLEPc

[Paul Cruise]

The error messages that I have is,
*
[0]PETSC ERROR: --------------------- Error Message
------------------------------------
[0]PETSC ERROR: Floating point exception!
[0]PETSC ERROR: Vec entry at local location 0 is not-a-number or infinite
at beginning of function: Parameter number 2!
[0]PETSC ERROR:
------------------------------------------------------------------------
[0]PETSC ERROR: Petsc Release Version 3.3.0, Patch 2, Fri Jul 13 15:42:00
CDT 2012
[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:
/gpfs/home/swayamjyoti_s/slepc-3.3/src/eps/examples/tutorials/Test/ex1f on
a arch-linu named merlinc19 by swayamjyoti_s Thu Sep 27 14:20:49 2012
[0]PETSC ERROR: Libraries linked from
/gpfs/home/swayamjyoti_s/petsc-3.3/arch-linux2-c-debug/lib
[0]PETSC ERROR: Configure run at Tue Aug 21 15:47:21 2012
[0]PETSC ERROR: Configure options --with-fc=ifort --download-f-blas-lapack
--download-mpich
[0]PETSC ERROR:
------------------------------------------------------------------------
[0]PETSC ERROR: MatMult() line 2081 in
/gpfs/home/swayamjyoti_s/petsc-3.3/src/mat/interface/matrix.c
[0]PETSC ERROR: STApply_Shift() line 41 in src/st/impls/shift/shift.c
[0]PETSC ERROR: STApply() line 67 in src/st/interface/stsolve.c
[0]PETSC ERROR: EPSFullLanczos() line 179 in src/eps/impls/krylov/krylov.c
[0]PETSC ERROR: EPSSolve_KrylovSchur_Symm() line 58 in
src/eps/impls/krylov/krylovschur/ks-symm.c
[0]PETSC ERROR: EPSSolve() line 130 in src/eps/interface/solve.c*

Could someone please help how to fix these?


On Thu, Sep 27, 2012 at 2:12 PM, Paul Cruise <paul.cruise.paul at gmail.com>wrote:

>
> Hello,
>
> I input a hessian matrix of size (5148 X 5148 size) into SLEPc to find
> it's eigenvalues (using EPS) as follows:
>
> *call MatCreate(PETSC_COMM_WORLD,A,ierr)
>       call MatSetSizes(A,PETSC_DECIDE,PETSC_DECIDE,3*natoms,3*natoms,ierr)
>       call MatSetFromOptions(A,ierr)
>       call MatSetUp(A,ierr)
>
>       do n=1,number_of_elements
>               call
> MatSetValues(A,3*natoms,indices(n,1),3*natoms,indices(n,2),elements(n),INSERT_VALUES,ierr)
>       end do
>
>       call MatAssemblyBegin(A,MAT_FINAL_ASSEMBLY,ierr)
>       call MatAssemblyEnd(A,MAT_FINAL_ASSEMBLY,ierr)*
>
> But somehow, the eigenvalues do not seem to converge as I find the
> following output:
> *
>  Number of iterations of the method:   1
>  Solution method: krylovschur
>  Number of requested eigenvalues: 1
>  Number of iterations of the method:   1
>  Solution method: krylovschur
>  Number of requested eigenvalues: 1
>  Stopping condition: tol=1.0000E-08, maxit= 648
>  Number of converged eigenpairs: 0
> *
> Can someone please tell me what's the problem, because this matrix for
> sure has eigenvalues as I have obtained before without using SLEPc?
>
> Thanks & Regards,
> Paul
>
>
>
>
>
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