> Hi,

> I have to do a lot of matrix operations that involve real symmetric

> matrices, and it would be much faster to store the lower triangular part in

> a vector form. I understand that blas operations can work directly with

> these packed forms. But as far as I know octave functions require the full

> matrices for operations such as matrix multiplications, am I wrong?

> I was wondering if there is a simple way to call blas functions directly

> from Oct files (I have some experience with them, but only c++ code). If

> someone has an example of these they could provide I think I could work

> from that. Any help on this direction will be appreciated!

> Thank you very much,

> Nicolas

Maybe the sparse matrices functions will help

https://octave.org/doc/v4.0.3/Creating-Sparse-Matrices.htmlRegards Nicklas SB Karlsson