Good day, I am solving a linear problem using finite elements with PETSC and I want to look at the H1 norm of my true error as a function of KSP iterations. I registered my own monitor function with KSP which looks something like the last function in this example: http://www.mcs.anl.gov/petsc/petsc-as/snapshots/petsc-dev/src/ksp/ksp/exampl... where I get the current state of the solution vector using KSPBuildSolution(kps,PETSC_NULL,&U) Then I use U to compute the H1 norm. As per the documentation I do not Destroy U after. When I have this monitor function registered, my H1 norm diverges while the KSP residual converges. Also, I compute the final H1 norm (outside of the monitor) and it is divergent, which matches the last iteration. If I remove my monitor function, things work well. What am I screwing up? How can I access the current solution vector in a KSP monitor? Do I need to use a vector that I create from a DA since my FEM matrix assembly is based in DAs? Thanks, NAte -- Nathan Collier Postdoctoral Researcher King Abdullah University of Science and Technology (KAUST) [email protected] [email protected]