Dear PETSC representatives, I am solving a nonlinear problem with SNESNGMRES and it converges faster with less iterations compared to otehr SNES methods. Any idea why that is the case? Also SNESQN diverges quickly. I tried to use SNESLINESEARCHBASIC for the linesearch option and nothing changes. I presume it is using the default SNESQN method. Btw, there are three options for QN, as "SNES_QN_LBFGS, SNES_QN_BROYDEN, SNES_QN_BADBROYEN" in teh manual. I tried to associate them with SNES however it seems these hyphened names don't work there. What am I missing?
Best regards, Ray
