j901 should be much faster. you can install j901 and compare by yourself.
Tue, 14 Jan 2020, Eric Morlet написал(а): > (my first reaction to J mail) > I work with J64-805 (JQt64) installed under Win 10. > > mat=. <:+:10000 10000 ?@$0 > +/,mat+/ . * %.mat > > The sum displayed, after 20 minutes, was 10000 > > > > On 1/10/2020 11:49 PM, Henry Rich wrote: > > Drat. I thought I had tested that. > > > > The error occurs when the size exceeds 384, because for caching purposes > > I break up matrix products bigger than that. Normal matrix > > multiplication works, but the versions used for %. save some time by > > taking advantage of the fact that the matrices involved are > > upper-triangular; that code fails when the size is too large. > > > > I have a fix for it now, but I need to understand why the tests didn't > > catch it & why the upper-triangular code fails in that case. > > > > Henry Rich > > > > On 1/10/2020 5:28 PM, Devon McCormick wrote: > > > So, in my recently installed J 9.01 (Engine: j901/j64avx2/windows), > > > I get > > > this surprising result in the final case (indentation added manually > > > since > > > this does not work for my session under emacs): > > > mat=. <:+:10 10?@$0 > > > +/,mat+/ . * %.mat > > > 10 > > > mat=. <:+:100 100?@$0 > > > +/,mat+/ . * %.mat > > > 100 > > > mat=. <:+:1000 1000?@$0 > > > +/,mat+/ . * %.mat > > > 21278.6 > > > > > > The last sum should be 1000. > > > > > > > > > > ---------------------------------------------------------------------- > > For information about J forums see http://www.jsoftware.com/forums.htm > > > > > > --- > > This email has been checked for viruses by AVG. > > https://www.avg.com > > ---------------------------------------------------------------------- > For information about J forums see http://www.jsoftware.com/forums.htm -- regards, ==================================================== GPG key 1024D/4434BAB3 2008-08-24 gpg --keyserver subkeys.pgp.net --armor --export 4434BAB3 ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
