Matrix API support - start with formats?

[Andrei Alexandrescu via Digitalmars-d]

I stumbled upon https://software.intel.com/en-us/node/471374 which gives 
good detail on Intel's Math Kernel Library's data formats for sparse 
matrices.

No doubt other popular linear algebra libraries have similar 
documentation. I was thinking we could start with adding these layouts 
to std, along with a few simple primitives (construction, element/slice 
access, stride etc). Then, people may just use those as they are or link 
with the linalg libraries for specific computations.


Thoughts?

Andrei