The error messages that I have is,<br><b><br>[0]PETSC ERROR: --------------------- Error Message ------------------------------------<br>[0]PETSC ERROR: Floating point exception!<br>[0]PETSC ERROR: Vec entry at local location 0 is not-a-number or infinite at beginning of function: Parameter number 2!<br>
[0]PETSC ERROR: ------------------------------------------------------------------------<br>[0]PETSC ERROR: Petsc Release Version 3.3.0, Patch 2, Fri Jul 13 15:42:00 CDT 2012<br>[0]PETSC ERROR: See docs/changes/index.html for recent updates.<br>
[0]PETSC ERROR: See docs/faq.html for hints about trouble shooting.<br>[0]PETSC ERROR: See docs/index.html for manual pages.<br>[0]PETSC ERROR: ------------------------------------------------------------------------<br>[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<br>
[0]PETSC ERROR: Libraries linked from /gpfs/home/swayamjyoti_s/petsc-3.3/arch-linux2-c-debug/lib<br>[0]PETSC ERROR: Configure run at Tue Aug 21 15:47:21 2012<br>[0]PETSC ERROR: Configure options --with-fc=ifort --download-f-blas-lapack --download-mpich<br>
[0]PETSC ERROR: ------------------------------------------------------------------------<br>[0]PETSC ERROR: MatMult() line 2081 in /gpfs/home/swayamjyoti_s/petsc-3.3/src/mat/interface/matrix.c<br>[0]PETSC ERROR: STApply_Shift() line 41 in src/st/impls/shift/shift.c<br>
[0]PETSC ERROR: STApply() line 67 in src/st/interface/stsolve.c<br>[0]PETSC ERROR: EPSFullLanczos() line 179 in src/eps/impls/krylov/krylov.c<br>[0]PETSC ERROR: EPSSolve_KrylovSchur_Symm() line 58 in src/eps/impls/krylov/krylovschur/ks-symm.c<br>
[0]PETSC ERROR: EPSSolve() line 130 in src/eps/interface/solve.c</b><br><br>Could someone please help how to fix these?<br><br><br><div class="gmail_quote">On Thu, Sep 27, 2012 at 2:12 PM, Paul Cruise <span dir="ltr"><<a href="mailto:paul.cruise.paul@gmail.com" target="_blank">paul.cruise.paul@gmail.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div class="HOEnZb"><div class="h5"><br><div class="gmail_quote">Hello,<br><br>I input a hessian matrix of size (5148 X 5148 size) into SLEPc to find it's eigenvalues (using EPS) as follows:<br>
<br><b>call MatCreate(PETSC_COMM_WORLD,A,ierr)<br> call MatSetSizes(A,PETSC_DECIDE,PETSC_DECIDE,3*natoms,3*natoms,ierr)<br>
call MatSetFromOptions(A,ierr)<br> call MatSetUp(A,ierr)<br><br> do n=1,number_of_elements<br> call MatSetValues(A,3*natoms,indices(n,1),3*natoms,indices(n,2),elements(n),INSERT_VALUES,ierr)<br>
end do<br><br> call MatAssemblyBegin(A,MAT_FINAL_ASSEMBLY,ierr)<br> call MatAssemblyEnd(A,MAT_FINAL_ASSEMBLY,ierr)</b><br><br>But somehow, the eigenvalues do not seem to converge as I find the following output:<br>
<b><br> Number of iterations of the method: 1<br> Solution method: krylovschur<br> Number of requested eigenvalues: 1<br> Number of iterations of the method: 1<br> Solution method: krylovschur<br> Number of requested eigenvalues: 1<br>
Stopping condition: tol=1.0000E-08, maxit= 648<br> Number of converged eigenpairs: 0<br></b><br>Can someone please tell me what's the problem, because this matrix for sure has eigenvalues as I have obtained before without using SLEPc?<br>
<br>Thanks & Regards,<br>Paul<br><br><br><br>
</div><br>
</div></div></blockquote></div><br>