[Coin-ipopt] Results from derivative test

[Fabian Wein]

I sent this answer by accident not to the list

Hi Andreas,

> > I'm not sure I understand what you mean by visualizing the relative
> > error. Do you mean generating some sort of graphic which helps you to
> > find which particular partial derivatives have how much error?

Exactly. I optimize a Finite Element simulation with one design
variable for each finite element (quadrilaterals, hexahedrons, ...)
and hence color-mapped visualization shall give a good insight of what
is going on.

> > 
> > In either case, the code for the derivative checker is in
> > Ipopt/src/Interfaces/IpTNLPAdapter.cpp
> > in the method
> > TNLPAdapter::CheckDerivatives

Thanks for the hint!
> > 
> > We could set things up so that another method is called when a new Ipopt
> > option would be set, and of course it would be nice to include such a
> > new method in the Ipopt distribution.

You mean a virtual method which gives back the finite difference
gradients,
possibly again the user provided gradients and the iteration number?

One could skip an additional feature, the virtual method is
implemented or not
(IMHO).

Well, coding is easy - it's for me more the working through the class
structure.
What do you mean with "We could set things up..."? Do you mean to assist?

Fabian