That seems to to allow for me to cook up a convergence test in terms of the 2 norm. What I’m really looking for is the ability to change things to be something like the 2 norm of the vector with elements
F_i/|x_i| where I am looking for a root of F(x). I can just build that scaling into the form function, but is there a way to do it without rewriting that piece of the code? -gideon > On Jan 12, 2016, at 12:14 AM, Barry Smith <[email protected]> wrote: > > > You can use SNESSetConvergenceTest() to use whatever test you want to > decide on convergence. > > Barry > >> On Jan 11, 2016, at 3:26 PM, Gideon Simpson <[email protected]> wrote: >> >> I’m solving nonlinear problem for a complex valued function which is >> decomposed into real and imaginary parts, Q = u + i v. What I’m finding is >> that where |Q| is small, the numerical phase errors tend to be larger. I >> suspect this is because it’s using the 2-norm for convergence in the SNES, >> so, where the solution is already, the phase errors are seen as small too. >> Is there a way to use something more like an infinity norm with SNES, to get >> more point wise control? >> >> -gideon >> >
