[petsc-users] obtaining estimated Hessian in BQNLS

[Matthew Knepley]

On Tue, Apr 25, 2023 at 8:53 AM Stefano Carli <stefano.carli at kuleuven.be>
wrote:

> Dear PETSc developers,
>
>
>
> I’m using PETSc version 3.14.1 coupled to a Fortran code, and I was
> wondering if there is a way of obtaining in output, possibly at each
> iteration, the estimated Hessian matrix for the BQNLS method.
>

It is represented as the outer product of sets of vectors. Is that what you
want?

  Thanks

     Matt


> Thank you in advance and best regards,
>
> Stefano Carli
>


-- 
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

https://www.cse.buffalo.edu/~knepley/ <http://www.cse.buffalo.edu/~knepley/>
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