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

David Andrs dandrs at unr.edu
Fri Aug 28 11:31:59 MDT 2009


The problem is currently very small (for debugging purposes), but later 
on it will be bigger. I know I need to use Epetra, so the 1DfemScaled.C 
is what I was looking for.

Thanks,
--
David

Roger Pawlowski wrote:
> 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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>>   
> 
> 



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