Hi all, Can anyone suggest ways of overcoming the following pivot error I keep receiving in my PETSc code during a KSPSolve().
[1]PETSC ERROR: Detected zero pivot in LU factorization see http://www.mcs.anl.gov/petsc/petsc-as/documentation/troubleshooting.html#ZeroPivot! [1]PETSC ERROR: Zero pivot row 1801 value 0.00102826 tolerance 0.00165189 * rowsum 1.65189e+09! From checking the documentation....the error is in row 1801, which means it is most likely not a matrix assembly issue? I tried the following prior to the solve with no luck either..... call KSPGetPC(ksp,pc,error) call PCFactorSetShiftNonzero(pc,PETSC_DECIDE,error) Is there anything else I can try? Thanks, Tim. -- Dr. Timothy Stitt <timothy_dot_stitt_at_ichec.ie> HPC Application Consultant - ICHEC (www.ichec.ie) Dublin Institute for Advanced Studies 5 Merrion Square - Dublin 2 - Ireland +353-1-6621333 (tel) / +353-1-6621477 (fax)
