Re: octave speed of eig

[Dmitri A. Sergatskov]

You probably get more replies on https://octave.discourse.group/

ATLAS is pretty much dead and the latest (circa 2018) runs awful 

on all reasonably modern (still 5 years old) computers I tried. 

Openblas is recommended instead.

Are you talking about dense matrices or sparse matrices?

On my 5-years old Ryzen  with dense matrix I see:

octave:1> a=randn(5000);
octave:2> tic; eig(a); toc
Elapsed time is 16.9589 seconds.

Dmitri.

On Thu, Feb 22, 2024 at 2:00 PM Clinton Winant <clinton.winant@gmail.com> wrote:

I am planning on using octave to compute eigenvalues/vectors for largish array.  Is it possible to speed that process by installing ATLAS?  Also which algorithm does octave use for eig if the matrix is not symmetric?  for eigs I assume the answer is arpack?

Thanks so much to all of you.

Clinton

----------
We are transitioning to a web based forum
for community help discussions at
https://octave.discourse.group/c/help