Florian Kauer <[email protected]> writes: > Hi, > what is the SNES solver actually doing when you do not provide a > jacobian and not explicitly select either finite differencing > approximation or matrix-free Newton-Krylov method? > > I just noticed that I mistakenly did this, but a good solution is found > anyway (and fast). So what is actually happening? Simple fixed-point > iteration?
Presumably you are using a DM that can provide a coloring, in which case the sparse Jacobian is assembled using finite differencing with coloring.
