On 22 September 2015 at 09:12, Mitchell, Lawrence <lawrence.mitchell@imperial.ac.uk> wrote:

> On 22 Sep 2015, at 09:10, Colin Cotter <colin.cotter@imperial.ac.uk> wrote:
>
> Dear all,
>   I would like to supply a preconditioning matrix for Newton that depends on current state. Does it do the Right Thing if I just use the field that is being solved into for this?

The preconditioning matrix will be reassembled at every newton step unless you ask for it not to be.  So it should just DTRT.

Lawrence