behzad : > > I set SNES with -snes_ksp_ew to solve the system with inexact method. I > want to reset the SNES into exact Newton with changing the KSP rtol at > final iterations (in full Newton phase). How can I reset the KSP tolerance > after specific iterations of SNES? > You can use SNESMonitorSet() and write your own monitor function to do this: http://www.mcs.anl.gov/petsc/petsc-current/docs/manualpages/SNES/SNESMonitorSet.html
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