[petsc-users] Object is in wrong state, Matrix is missing diagonal entry 0

[baikadi pranay]

Hello everyone,
I am trying to solve the Poisson equation using SNES class. I am running
into a problem where PETSc complains that an object is in wrong state. I
opened the matrix object in matlab to see if any diagonal entry is missing
but I see that it is not the case. Could you please let me know what I am
missing here?  The complete error is as follows:

[0]PETSC ERROR: --------------------- Error Message
--------------------------------------------------------------
[0]PETSC ERROR: Object is in wrong state
[0]PETSC ERROR: Matrix is missing diagonal entry 0
[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 cg17-9.agave.rc.asu.edu
by pbaikadi Wed Oct 14 11:33:45 2020
[0]PETSC ERROR: Configure options
[0]PETSC ERROR: #1 MatILUFactorSymbolic_SeqAIJ() line 1687 in
/packages/7x/petsc/3.11.1/petsc-3.11.1/src/mat/impls/aij/seq/aijfact.c
[0]PETSC ERROR: #2 MatILUFactorSymbolic() line 6737 in
/packages/7x/petsc/3.11.1/petsc-3.11.1/src/mat/interface/matrix.c
[0]PETSC ERROR: #3 PCSetUp_ILU() line 144 in
/packages/7x/petsc/3.11.1/petsc-3.11.1/src/ksp/pc/impls/factor/ilu/ilu.c
[0]PETSC ERROR: #4 PCSetUp() line 932 in
/packages/7x/petsc/3.11.1/petsc-3.11.1/src/ksp/pc/interface/precon.c
[0]PETSC ERROR: #5 KSPSetUp() line 391 in
/packages/7x/petsc/3.11.1/petsc-3.11.1/src/ksp/ksp/interface/itfunc.c
[0]PETSC ERROR: #6 KSPSolve() line 725 in
/packages/7x/petsc/3.11.1/petsc-3.11.1/src/ksp/ksp/interface/itfunc.c
[0]PETSC ERROR: #7 SNESSolve_NEWTONLS() line 225 in
/packages/7x/petsc/3.11.1/petsc-3.11.1/src/snes/impls/ls/ls.c
[0]PETSC ERROR: #8 SNESSolve() line 4560 in
/packages/7x/petsc/3.11.1/petsc-3.11.1/src/snes/interface/snes.c
[0]PETSC ERROR: #9 User provided function() line 0 in User file

On a different note, I have two more questions.
1) When a matrix is being filled using MatSetValues, does the nnz vector
also have a 0-based indexing?
2) If I explicitly have nnz 1-based indexing, then does nnz(i) indicate the
number of nonzeros in the (i-1)^th row or the i^th row?

Thank you in advance for your help.
Best Regards,
Pranay.
ᐧ
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