Hi, all, I am testing KSPSetInitialGuessNonzero using the case
https://www.mcs.anl.gov/petsc/petsc-current/src/ksp/ksp/examples/tutorials/ex50.c.html This case is special. WIth zero initial guess, 1 iteration can deliver the exact solution. But when I tried true for KSPSetInitialGuessNonzero, it shows the same convergence history as false. Does the code change KSPSetInitialGuessNonzero to false automatically? Take care. Thanks, Xiaodong Liu, PhD X: Computational Physics Division Los Alamos National Laboratory P.O. Box 1663, Los Alamos, NM 87544 505-709-0534
