[Dune-devel] Tensor data structures and operations on tensors

[Christoph Grüninger]

Hi Simon,
year suggestion reads neat! I would like to get a unified data type for 
vectors and matrices. Just be sure: The core of the data structure is an 
unmodified mdarray/mdspan as it is proposed to C++23 or some later 
version. You just added some helper functions to get mathematical 
operations done, right? Thanks for all the effort you put into this!

In the long run, this could lead a central data structure to be 
compatilbe across the C++ world compared to a bunch of Dune-specific 
classes.

In general, I support your suggestions. I would wait with adding it to 
Dune core until mdarray/mdspan are voted into the standard. Not sure how 
to make a transition. Could be, that we have the old and the new classes 
living peaceful side by side for a long time. Would we okay for me.

Bye
Christoph

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