SNES and internal variables

Matthew Knepley knepley at
Wed Sep 30 11:04:28 CDT 2009

Yes, that is a general update function, suitable for updating this
information at the
start of a Newton iterate.


On Wed, Sep 30, 2009 at 10:53 AM, Lukasz Kaczmarczyk <likask at
> wrote:

> Hello,
> I like to use  SNES to solve nonlinear system of equations. For my problem,
> I have to update some internal variables for computed newtons increments of
> primary unknowns, before I update residual (right hand side) and Jacobian. I
> found function SNESSetUpdate which is called at the beginning o every
> iteration. But I am not sure enough if that function is proper for updating
> internal variables. Can You advise me if it is right to use internal
> variables, f.e. increments of plastic strain at gauss points.
> Lukasz Kaczmarczyk

What most experimenters take for granted before they begin their experiments
is infinitely more interesting than any results to which their experiments
-- Norbert Wiener
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