[Dune] Is anyone using the FMatrixHelp/DynamicMatrixHelp eigenvalue functions?

[Oliver Sander]

Hi Jö,

> - fmatrixev.hh:
>   - FMatrixHelp::eigenValues<dim, K>() for dim > 3
>   - FMatrixHelp::eigenValuesNonSym()

I don't think I currently use them.  However, these very days I was toying around
with the idea of using them to implement the Golub-Welsch algorithm for computing
Gauß quadrature points.  This does not mean that I veto the removal.  I don't
think that the implementation in dune-common is particularly pretty, and
I am not sure that dune-common is the best place for this kind of advanced
numerical linear algebra.

Best,
Oliver



>   - FMatrixHelp::eigenValuesLapackCall()
>   - FMatrixHelp::eigenValuesNonsymLapackCall()
> - dynmatrixev.hh:
>   - DynamicMatrixHelp::eigenValuesNonSym()
>   - DynamicMatrixHelp::eigenValuesNonsymLapackCall()
> 
> Please respond until 2018-07-09 (in one week) I you use those functions,
> otherwise I'll start removing them (and that would would be a waste of time if
> the removal has to be reverted later...).
> 
> 
> Backgound: https://gitlab.dune-project.org/core/dune-istl/issues/48
> 
> Essentially, these functions require Lapack and in turn blas to be linked into
> the dune-common library, causing hanging programs due to incompatible versions
> of blas being linked later from dune-istl, depending on system system
> configuration.
> 
> The "Help" suffix on the namespaces suggests that these functions are not part
> of any official interface, which would mean they can be removed without
> notice.  That may already solve the linking problem, and if it doesn't at
> least it I would only have dune-istl left to deal with.
> 
> On the other hand, these functions, although they are only thin wrappers at
> best around lapack functions, do have quite elaborate tests, suggesting
> someone might care about them.  So I thought I'd better ask here.
> 
> Regards,
> Jö.
> 
> 
> 
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