[Trilinos-Users] Using NOX to solve nonlinear problem with analytic Jacobian

Roger Pawlowski rppawlo at sandia.gov
Fri Aug 28 10:57:42 MDT 2009

Hi David,

How big is the system you want to solve?  If it is small enough to use 
direct solvers, then you can probably use the lapack support.  A simple 
example with an analytic Jacobian is in 
nox/examples/lapack/NOX_SimpleExamples/Rosenbrock.C.  If you are looking 
for large-scale parallel nonlinear solvers, you will need the epetra 
support.  An example of a parallel 1D finite element problem with an 
analytic Jacobian is in nox/test/epetra/1Dfem/1DfemScaled.C. 

Roger Pawlowski

David Andrs wrote:
> Hello!
> I'd like to use Trilinos' NOX solver to solve a simple nonlinear problem 
> using analytic Jacobian J (because I'm able to form it) and residual F - 
> i.e. to use the classic Newton's method.
> I tried to find an example that is doing this, but did not find it 
> (maybe I overlooked something). Could someone point me in a correct 
> direction?
> Thank you for any help,
> --
> David Andrs
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> Trilinos-Users at software.sandia.gov
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