[petsc-users] Floating point exception

[baikadi pranay]

Hello,

The entire output is the following:


[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 end of function: Parameter number 3
[0]PETSC ERROR: See http://www.mcs.anl.gov/petsc/documentation/faq.html for
trouble shooting.
[0]PETSC ERROR: Petsc Release Version 3.11.1, Apr, 12, 2019
[0]PETSC ERROR: ./a.out on a linux-gnu-c-debug named agave1.agave.rc.asu.edu
by pbaikadi Sat Nov 30 14:54:31 2019
[0]PETSC ERROR: Configure options
[0]PETSC ERROR: #1 VecValidValues() line 28 in
/packages/7x/petsc/3.11.1/petsc-3.11.1/src/vec/vec/interface/rvector.c
[0]PETSC ERROR: #2 PCApply() line 464 in
/packages/7x/petsc/3.11.1/petsc-3.11.1/src/ksp/pc/interface/precon.c
[0]PETSC ERROR: #3 KSP_PCApply() line 281 in
/packages/7x/petsc/3.11.1/petsc-3.11.1/include/petsc/private/kspimpl.h
[0]PETSC ERROR: #4 KSPSolve_PREONLY() line 22 in
/packages/7x/petsc/3.11.1/petsc-3.11.1/src/ksp/ksp/impls/preonly/preonly.c
[0]PETSC ERROR: #5 KSPSolve() line 782 in
/packages/7x/petsc/3.11.1/petsc-3.11.1/src/ksp/ksp/interface/itfunc.c
[0]PETSC ERROR: #6 STMatSolve() line 193 in
/packages/7x/slepc/3.11.1/slepc-3.11.1/src/sys/classes/st/interface/stsles.c
[0]PETSC ERROR: #7 STApply_Shift() line 25 in
/packages/7x/slepc/3.11.1/slepc-3.11.1/src/sys/classes/st/impls/shift/shift.c
[0]PETSC ERROR: #8 STApply() line 57 in
/packages/7x/slepc/3.11.1/slepc-3.11.1/src/sys/classes/st/interface/stsolve.c
[0]PETSC ERROR: #9 EPSGetStartVector() line 797 in
/packages/7x/slepc/3.11.1/slepc-3.11.1/src/eps/interface/epssolve.c
[0]PETSC ERROR: #10 EPSSolve_KrylovSchur_Symm() line 32 in
/packages/7x/slepc/3.11.1/slepc-3.11.1/src/eps/impls/krylov/krylovschur/ks-symm.c
[0]PETSC ERROR: #11 EPSSolve() line 149 in
/packages/7x/slepc/3.11.1/slepc-3.11.1/src/eps/interface/epssolve.c

Regards,
Pranay.

On Sat, Nov 30, 2019 at 2:46 PM Matthew Knepley <knepley at gmail.com> wrote:

> On Sat, Nov 30, 2019 at 3:19 PM baikadi pranay <pranayreddy865 at gmail.com>
> wrote:
>
>> Hello PETSc users,
>>
>> I am currently trying to build a 1-D Schrodinger solver. I have built my
>> hamiltonian matrix (of size 121 x 121) and i'm trying to find the
>> eigenvalues. I have the following lines of code for the solver:
>>
>> *call EPSCreate(PETSC_COMM_WORLD,eps,ierr)*
>>
>> *call EPSSetOperators(eps,ham,S,ierr)call
>> EPSSetProblemType(eps,EPS_GHEP,ierr)*
>>
>>
>>
>> *call EPSSetFromOptions(eps,ierr)call
>> EPSSetDimensions(eps,10,PETSC_DEFAULT_INTEGER,PETSC_DEFAULT_INTEGER,ierr)call
>> EPSSolve(eps,ierr)call EPSDestroy(eps,ierr)*
>>
>> At the EPSSolve line, i get the following error:
>>
>>
>>
>>
>>
>> *[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 end of function: Parameter number
>> 3[0]PETSC ERROR: See http://www.mcs.anl.gov/petsc/documentation/faq.html
>> <http://www.mcs.anl.gov/petsc/documentation/faq.html> for trouble
>> shooting.[0]PETSC ERROR: Petsc Release Version 3.11.1, Apr, 12, 2019*
>>
>
> You need to show the entire stack trace that is output here.
>
>   Thanks,
>
>      Matt
>
>
>> I am using the options *-st_pc_factor_shift_type NONZERO
>> -st_pc_factor_shift_amount 1*     ( else I end up getting the "zero
>> pivot in LU factorization" error ).
>>
>> I outputted my matrix to matlab and confirmed that the null space is
>> empty and the matrix is not singular. I am not sure why I'm getting this
>> error. Could you provide me a hint as to how to solve this problem.
>>
>> Sincerely,
>> Pranay.
>>
>
>
> --
> 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
>
> https://www.cse.buffalo.edu/~knepley/
> <http://www.cse.buffalo.edu/~knepley/>
>
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