petsc-3.7.1 2016-05-15
KSP_DIVERGED_INDEFINITE_PC
It appears the preconditioner is indefinite (has both positive and negative eigenvalues) and this Krylov method (KSPCG) requires it to be positive definite Many br
Notes: This can happen with the PCICC preconditioner, use -pc_factor_shift_positive_definite to force Many brthe PCICC preconditioner to generate a positive definite preconditioner Many br
See Also
KSPSolve(), KSPGetConvergedReason(), KSPConvergedReason, KSPSetTolerances()
Level:beginner
Location:src/ksp/ksp/../../../include/petscksp.h
Index of all KSP routines
Table of Contents for all manual pages
Index of all manual pages
Examples
src/ksp/pc/examples/tutorials/ex1.c.html
src/ksp/pc/examples/tutorials/ex2.c.html