Sent indirectly from laptop via iPad, as explained below, Cheers, Mike Sent from my iPad
Begin forwarded message: > From: Mike Day <[email protected]> > Date: 1 November 2018 at 17:06:30 GMT > To: "mike_liz.day" <[email protected]> > Subject: Re: [Jbeta] math/mt/quatern : qnk bug, qnf extension > Reply-To: [email protected] > > Warning - the script's link to Bairak/matematik (or similar) threw up a virus > warning on my laptop. > > I'm doing a full scan right now. I'm sending from the laptop via my iPad, > which should ensure this > > email is clean. > > Main message, which I was drafting when virus warning appeared, now follows: > > I've hardly ever looked at Quarternions since college days, when I think we > > we were just told about them but didn't actually work with them. > > So, loading up ~addons/math/mt/quatern.ijs reveals fairly new material. > > Wiki on Quaternions suggests that you're using the "Cayley-Dickson > construction", > > which appears a useful way of dealing with these quadruples, but was new to > me. > > If so, it would be helpful if you could say so in a comment. > > Also, I tried the two references in the script. The first, to Karataev, > (not Platon!) > > does not work currently; the other, to Bairak, seems to be risky - I've just > killed > > Google Chrome, which was threatening a virus, which I've now got to check! > > Cheers, > > Mike > > > > >> On 01/11/2018 03:18, Igor Zhuravlov wrote: >>> On Tue, Oct 30, 2018 at 5:27 PM Raul Miller <[email protected]> wrote: >>> Currently, >>> >>> require'math/mt' >>> 1 qn1_mt_ 0 0 >>> 1 0 >>> 1 qni_mt_ 0 0 >>> 0j1 0 >>> 1 qnj_mt_ 0 0 >>> 0 1 >>> 1 qnk_mt_ 0 0 >>> 0 1 >>> >>> To fix, maybe we should change the definition of qnk to: >>> >>> qnk=: 11&o.@{: : ((j.~qnj) 1} ]) >> Thank you, is fixed now. >> >> On Wed, Oct 31, 2018 at 7:31 PM Raul Miller <[email protected]> wrote: >>> That said, qnf_mt_ seems to only deal with the monadic case. >> Extending qnf is an interesting idea. It needs some study, though. >> > > > Virus-free. www.avast.com ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
