Hi all!  We submitted a proposal for a C++ Standard linear algebra library.

Here is the proposal itself:
https://github.com/mhoemmen/cpp-proposals-pub/blob/Pre-COL2019-BLAS/D1673/blas_interface.md

Here is a design discussion and justification:

https://github.com/mhoemmen/cpp-proposals-pub/blob/Pre-COL2019-BLAS/D1674/evolving-from-blas.md

We also have an “mdarray” proposal – that is a container variant of mdspan, that might be a better option for very small matrices and vectors:

https://isocpp.org/files/papers/P1684R0.pdf

The first two are LONG so maybe fix yourself a nice beverage beforehand ; - ) .

Best,

mfh