Re: [Cppqed-support] Eigen

[Raimar S. <rai...@ui...>]

Dear András,

wow, that was quick!

#include <Eigen/Core> is definitely right. Eigen3 distributes a 
FindEigen3.cmake, therefore find_package(Eigen3) will set all the required 
variables and we only have to call include_directories(Eigen3_INCLUDE_DIRS) in 
order to have /usr/include/eigen3 in the include path (or whatever the right 
path is on the specific distribution).

I will update the cmake build system accordingly. Should I then already merge 
it to Development or leave it in the feature branch for now?

Raimar

On Tuesday, November 19, 2013 02:25:04 PM Andras Vukics wrote:
> Dear Raimar,
> I have now completed migration to Eigen3, and it seems to work fine. I have
> pushed the feature branch named Eigen to SourceForge (only core & scripts
> affected).
> Could you please fetch the branch and update cmake such that it looks for
> Eigen3 instead of FLENS? If not found, DO_NOT_USE_EIGEN should be set.
> Two points to note:
> * EIGEN_NO_DEBUG should be set for release mode but the documentation of
> Eigen states that it gets set if NDEBUG is set, so in principle we do not
> need to care about this.
> * Under ARCH (and Ubuntu also, I think), Eigen3 gets installed under a
> directory called eigen3, so that the main include files can be pulled in as
> #include <eigen3/Eigen/Core>
> for example. However, in the documentation they only use
> #include <Eigen/Core>
> It would be nice to have this latter, especially because this eigen3
> directory will not necessarily exist in all distributions. Hence, if Eigen3
> is found, this eigen3 directory should be put into the include path.
> Thanks, with best regards,
> András
> 
> 
> Dr. Andras Vukics
> Institute for Theoretical Physics
> University of Innsbruck