SNES and internal variables

Lukasz Kaczmarczyk likask at
Wed Sep 30 11:20:17 CDT 2009

Thank You for Your fast response.


On 30 Sep 2009, at 17:04, Matthew Knepley wrote:

> Yes, that is a general update function, suitable for updating this  
> information at the
> start of a Newton iterate.
>   Matt
> 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 lead.
> -- Norbert Wiener

Lukasz Kaczmarczyk
Department of Civil Engineering,
University of Glasgow,
Tel: +44 141 3305348
email: likask at

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