Bill Lam Your correction will be OK.
Thanks Bill Szuch -----Original Message----- From: programming-boun...@jsoftware.com [mailto:programming-boun...@jsoftware.com] On Behalf Of programming-requ...@jsoftware.com Sent: Sunday, 8 January 2012 3:00 PM To: programming@jsoftware.com Subject: Programming Digest, Vol 76, Issue 39 Send Programming mailing list submissions to programming@jsoftware.com To subscribe or unsubscribe via the World Wide Web, visit http://jsoftware.com/cgi-bin/mailman/listinfo/programming or, via email, send a message with subject or body 'help' to programming-requ...@jsoftware.com You can reach the person managing the list at programming-ow...@jsoftware.com When replying, please edit your Subject line so it is more specific than "Re: Contents of Programming digest..." Today's Topics: 1. Re: Getting the diagonal of a square matrix (Papp Erik Tam?s) 2. Re: Indexed assignment must be slow? (Marc Simpson) 3. Re: Getting the diagonal of a square matrix (Don Guinn) 4. Re: Getting the diagonal of a square matrix (Alex Giannakopoulos) 5. jfilesrc (William Szuch) 6. Re: jfilesrc (bill lam) ---------------------------------------------------------------------- Message: 1 Date: Sat, 07 Jan 2012 11:36:01 +0100 From: "Papp Erik Tam?s" <papp.e...@ybl.szie.hu> Subject: Re: [Jprogramming] Getting the diagonal of a square matrix To: Programming forum <programming@jsoftware.com> Message-ID: <f76f9cc7d193.4f082...@szie.hu> Content-Type: text/plain; charset=iso-8859-2 Hi, Some example of getting the main diagonal of square matrices: ]A=:2 2$1 2 3 4 1 2 3 4 (<0 1)|:A NB. The main diagonal of a square matrix A 1 4 ]B=:3 3$1 2 3 4 5 6 1 2 3 4 5 6 1 2 3 (<0 1)|:B NB. The main diagonal of a square matrix B 1 5 3 ]N=:4 4$i. 16 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 (<0 1)|:N NB. The main diagonal of a square matrix N 0 5 10 15 Regards, Erik ----- Eredeti lev?l (Original Message) ----- Felad?: Alex Giannakopoulos <aeg...@blueyonder.co.uk> D?tum: P?ntek, Janu?r 6, 2012 9:48 du T?rgy: [Jprogramming] Getting the diagonal of a square matrix C?mzett: Programming forum <programming@jsoftware.com> > Hi > > Is there a better (more efficient or whatever) way of getting the > diagonal of a matrix than the simple multiplication I use below? > > Say, > > randmat=. [: ? 0 $~,~ > idmat =. [:=i. > randiag =. randmat * idmat > > Many Thanks > ----------------------------------------------------------------- > ----- > For information about J forums see http://www.jsoftware.com/forums.htm > ------------------------------ Message: 2 Date: Sat, 7 Jan 2012 12:19:27 +0000 From: Marc Simpson <m...@0branch.com> Subject: Re: [Jprogramming] Indexed assignment must be slow? To: Programming forum <programming@jsoftware.com> Message-ID: <CAMbwm8_5D6Lhexqw3iDKHoCJZ_CufhiBfRaxuT-=uvx9j2v...@mail.gmail.com> Content-Type: text/plain; charset=ISO-8859-1 On Fri, Jan 6, 2012 at 11:42 PM, Alexander Mikhailov <avm...@yahoo.com> wrote: > > I'm not quite sure about this line - > > x=:55(3})(some verb returning a scalar)44(2})x > > If the verb returns a scalar - not a vector - then how 55 (3}) will work on the result of that verb?.. > > May be this time I'm missing something? I gather that something like this v =: >: x =: 55 (3}) (v 44) (2}) x was intended (at least, that's how I read it). M ------------------------------ Message: 3 Date: Sat, 7 Jan 2012 06:28:18 -0700 From: Don Guinn <dongu...@gmail.com> Subject: Re: [Jprogramming] Getting the diagonal of a square matrix To: Programming forum <programming@jsoftware.com> Message-ID: <caecakcmvwvv5ivmjjtsotek+pudizcuxzqvhrblee8yypu8...@mail.gmail.com> Content-Type: text/plain; charset=UTF-8 i.3 3 3 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 (<0 1 2)|:i.3 3 3 0 13 26 (<0 1)|:i.3 3 3 0 12 24 1 13 25 2 14 26 2012/1/7 "Papp Erik Tam?s" <papp.e...@ybl.szie.hu> > Hi, > > Some example of getting the main diagonal of square matrices: > > ]A=:2 2$1 2 3 4 > 1 2 > 3 4 > > (<0 1)|:A NB. The main diagonal of a square matrix A > 1 4 > > ]B=:3 3$1 2 3 4 5 6 > 1 2 3 > 4 5 6 > 1 2 3 > > (<0 1)|:B NB. The main diagonal of a square matrix B > 1 5 3 > > ]N=:4 4$i. 16 > 0 1 2 3 > 4 5 6 7 > 8 9 10 11 > 12 13 14 15 > > (<0 1)|:N NB. The main diagonal of a square matrix N > 0 5 10 15 > > Regards, > > Erik > ----- Eredeti lev?l (Original Message) ----- > Felad?: Alex Giannakopoulos <aeg...@blueyonder.co.uk> > D?tum: P?ntek, Janu?r 6, 2012 9:48 du > T?rgy: [Jprogramming] Getting the diagonal of a square matrix > C?mzett: Programming forum <programming@jsoftware.com> > > > Hi > > > > Is there a better (more efficient or whatever) way of getting the > > diagonal of a matrix than the simple multiplication I use below? > > > > Say, > > > > randmat=. [: ? 0 $~,~ > > idmat =. [:=i. > > randiag =. randmat * idmat > > > > Many Thanks > > ----------------------------------------------------------------- > > ----- > > For information about J forums see > > http://www.jsoftware.com/forums.htm > > > ---------------------------------------------------------------------- > For information about J forums see http://www.jsoftware.com/forums.htm > ------------------------------ Message: 4 Date: Sat, 7 Jan 2012 21:37:32 +0000 From: Alex Giannakopoulos <aeg...@blueyonder.co.uk> Subject: Re: [Jprogramming] Getting the diagonal of a square matrix To: Programming forum <programming@jsoftware.com> Message-ID: <CAD=r9jnavog4cmg+kljwyxieoe6pm0mtk7ygbc+25s0u+xy...@mail.gmail.com> Content-Type: text/plain; charset=ISO-8859-1 Yeah, great stuff that, Don, thanks. Could do with a fuller tutorial, though. Didn't find anything other than the 2 line description Might give it a go myself when I fully understand it. On 7 January 2012 13:28, Don Guinn <dongu...@gmail.com> wrote: > i.3 3 3 > 0 1 2 > 3 4 5 > 6 7 8 > > 9 10 11 > 12 13 14 > 15 16 17 > > 18 19 20 > 21 22 23 > 24 25 26 > (<0 1 2)|:i.3 3 3 > 0 13 26 > (<0 1)|:i.3 3 3 > 0 12 24 > 1 13 25 > 2 14 26 > > ------------------------------ Message: 5 Date: Sun, 8 Jan 2012 10:27:39 +1100 From: "William Szuch" <bsz...@wsa-fincon.com.au> Subject: [Jprogramming] jfilesrc To: "J Programming Forum" <programming@jsoftware.com> Message-ID: <000001cccd93$f2299600$d67cc200$@wsa-fincon.com.au> Content-Type: text/plain; charset="us-ascii" Suggestion: Include: media/avi avi media/wmv wmv Regards Bill Szuch ------------------------------ Message: 6 Date: Sun, 8 Jan 2012 10:03:27 +0800 From: bill lam <bbill....@gmail.com> Subject: Re: [Jprogramming] jfilesrc To: programming@jsoftware.com Message-ID: <20120108020327.GA2862@debian.b2j> Content-Type: text/plain; charset=utf-8 I checked /etc/mime.types in my debian, there is no 'media' types. it contains lines video/x-ms-wmv wmv video/x-msvideo avi will these be ok? Which browsers expect the mime.type you describe? ???, 08 ??? 2012, William Szuch ?????(?): > Suggestion: > > Include: > > media/avi avi > > media/wmv wmv > > > > > > > > Regards > > > > Bill Szuch > > > > ---------------------------------------------------------------------- > 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 --recv-keys 4434BAB3 ------------------------------ ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm End of Programming Digest, Vol 76, Issue 39 ******************************************* ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
