You need set 0.0 to the diagonals. Diagonal storage is used in PETSc library.
Hong On Tue, Oct 18, 2016 at 10:11 AM, Kong, Fande <fande.k...@inl.gov> wrote: > Hi Developers, > > Any reason to force users provide a matrix which does not miss any > diagonal entries when using a LU-type solver? > > Sometime, it is impossible to have all diagonal entries in a matrix, that > is, the matrix has to miss some diagonal entries. For example, there is a > saddle-point matrix from the discretization of incomprehensible equations, > and the lower part of the matrix is a zero block. The matrix usually looks > like: > > | A B^T | > | B 0 | > > > > > > [56]PETSC ERROR: Object is in wrong state > [56]PETSC ERROR: Matrix is missing diagonal entry 33 > [56]PETSC ERROR: See http://www.mcs.anl.gov/petsc/documentation/faq.html > for trouble shooting. > [56]PETSC ERROR: Petsc Release Version 3.6.2, unknown > [56]PETSC ERROR: ./fluid on a arch-linux2-cxx-opt named ys0755 by fandek > Mon Oct 17 17:06:08 2016 > [56]PETSC ERROR: Configure options --with-clanguage=cxx > --with-shared-libraries=1 --download-fblaslapack=1 --with-mpi=1 > --download-parmetis=1 --download-metis=1 --with-netcdf=1 > --download-exodusii=1 --with-hdf5=1 --with-debugging=no --with-c2html=0 > --with-64-bit-indices=1 --download-hypre=1 --download-superlu_dist=1 > [56]PETSC ERROR: #1 MatILUFactorSymbolic_SeqAIJ() line 1729 in > /petsc_installed/petsc/src/mat/impls/aij/seq/aijfact.c > [56]PETSC ERROR: #2 MatILUFactorSymbolic() line 6457 in > /petsc_installed/petsc/src/mat/interface/matrix.c > [56]PETSC ERROR: #3 PCSetUp_ILU() line 204 in /petsc_installed/petsc/src/ > ksp/pc/impls/factor/ilu/ilu.c > [56]PETSC ERROR: #4 PCSetUp() line 983 in /petsc_installed/petsc/src/ > ksp/pc/interface/precon.c > [56]PETSC ERROR: #5 KSPSetUp() line 332 in /petsc_installed/petsc/src/ > ksp/ksp/interface/itfunc.c > [56]PETSC ERROR: #6 PCSetUpOnBlocks_ASM() line 405 in > /petsc_installed/petsc/src/ksp/pc/impls/asm/asm.c > [56]PETSC ERROR: #7 PCSetUpOnBlocks() line 1016 in > /petsc_installed/petsc/src/ksp/pc/interface/precon.c > [56]PETSC ERROR: #8 KSPSetUpOnBlocks() line 167 in > /petsc_installed/petsc/src/ksp/ksp/interface/itfunc.c > [56]PETSC ERROR: #9 KSPSolve() line 552 in /petsc_installed/petsc/src/ > ksp/ksp/interface/itfunc.c > [56]PETSC ERROR: #10 PCApply_LSC() line 83 in /petsc_installed/petsc/src/ > ksp/pc/impls/lsc/lsc.c > [56]PETSC ERROR: #11 PCApply() line 483 in /petsc_installed/petsc/src/ > ksp/pc/interface/precon.c > [56]PETSC ERROR: #12 KSP_PCApply() line 242 in /petsc_installed/petsc/ > include/petsc/private/kspimpl.h > [56]PETSC ERROR: #13 KSPSolve_PREONLY() line 26 in > /petsc_installed/petsc/src/ksp/ksp/impls/preonly/preonly.c > [56]PETSC ERROR: #14 KSPSolve() line 604 in /petsc_installed/petsc/src/ > ksp/ksp/interface/itfunc.c > [56]PETSC ERROR: #15 PCApply_FieldSplit_Schur() line 904 in > /petsc_installed/petsc/src/ksp/pc/impls/fieldsplit/fieldsplit.c > [56]PETSC ERROR: #16 PCApply() line 483 in /petsc_installed/petsc/src/ > ksp/pc/interface/precon.c > [56]PETSC ERROR: #17 KSP_PCApply() line 242 in /petsc_installed/petsc/ > include/petsc/private/kspimpl.h > [56]PETSC ERROR: #18 KSPInitialResidual() line 63 in > /petsc_installed/petsc/src/ksp/ksp/interface/itres.c > [56]PETSC ERROR: #19 KSPSolve_GMRES() line 235 in > /petsc_installed/petsc/src/ksp/ksp/impls/gmres/gmres.c > [56]PETSC ERROR: #20 KSPSolve() line 604 in /petsc_installed/petsc/src/ > ksp/ksp/interface/itfunc.c > [56]PETSC ERROR: #21 SNESSolve_NEWTONLS() line 233 in > /petsc_installed/petsc/src/snes/impls/ls/ls.c > [56]PETSC ERROR: #22 SNESSolve() line 3906 in /petsc_installed/petsc/src/ > snes/interface/snes.c > > > Thanks, > > Fande Kong, >