Agreed. Doesn't it work in both IOs?
On Sat, Jun 14, 2008 at 2:36 PM, Ralph G Selfridge <[EMAIL PROTECTED]> wrote: > Yes it is, remember J is origin 0. [-.5] puts things together with a new > leading axis. If origin is 1 (APL) you would then use [.5] > > > > > On Sat, 14 Jun 2008, Randy MacDonald wrote: > > No, it isn't. >> >> Roger Hui wrote: >> >>> x,[_0.5] y in APL is equivalent to x,:y in J. >>> >>> >>> >>> ----- Original Message ----- >>> From: PackRat <[EMAIL PROTECTED]> >>> Date: Thursday, June 12, 2008 6:11 >>> Subject: [Jprogramming] Bracket APL-to-J question >>> To: Programming forum <[email protected]> >>> >>> >>> I wasn't sure which forum was the best for this kind of APL-to-J >>>> programming question, so I thought I'd try it here. If that's not correct, >>>> please let me know, so that I can submit any future questions along this >>>> line to the appropriate forum. >>>> >>>> I have a master's degree in music, and one of the main reasons behind my >>>> learning J is to translate a published set of 66 computer- >>>> assisted musical composition functions from APL to J. I'm pleasantly >>>> surprised that my intense trying over the past several months to understand >>>> array programming and J in particular seems to be paying off. Though by no >>>> means being anywhere near very knowledgeable, I've been able to look at >>>> both >>>> J and APL code and, in most cases, to understand what was going on and, >>>> with >>>> APL code, to successfully begin translating to J versions. (I've even been >>>> able to note on occasion that J had a better/shorter way to do something >>>> than the APL code did.) >>>> >>>> However, I ran into an APL construction that I cannot find in the half >>>> dozen APL books I have. Since many/most of you have APL background, I >>>> thought I ask here so that I could have some assistance in translating to >>>> J. >>>> Here's the line that's stumped me (I substituted J's ~: for the APL >>>> not-equal symbol and <- for APL's assignment symbol): >>>> >>>> Z <- R,[_0.5](0 ~: ATTK)/ATTK <- +/[0] Z >>>> >>>> I understand everything except the [_0.5] code and what it means in >>>> context. It doesn't seem to fit anything in my books about bracketed >>>> indexing in APL, and none of the book indexes lead to any information about >>>> what this construction might mean, so that I can translate it to J. Thanks >>>> in advance for any help! >>>> >>>> ---------------------------------------------------------------------- >>> For information about J forums see http://www.jsoftware.com/forums.htm >>> >>> >>> >> -- >> ------------------------------------------------------------------------ >> |\/| Randy A MacDonald | APL: If you can say it, it's done.. (ram) >> |/\| ramacd <at> nbnet.nb.ca | >> |\ | | The only real problem with APL is that >> BSc(Math) UNBF'83 | it is "still ahead of its time." >> Sapere Aude | - Morten Kromberg >> Natural Born APL'er | >> -----------------------------------------------------(INTP)----{ gnat }- >> >> >> ---------------------------------------------------------------------- >> For information about J forums see http://www.jsoftware.com/forums.htm >> >> ---------------------------------------------------------------------- > For information about J forums see http://www.jsoftware.com/forums.htm > -- Use Reply-To: & thread your email after the first: or it may take a while, as I get 2000 emails per day. -- Roy A. Crabtree UNC '76 gaa.lifer# (For TN contact, email me to set up a confirmed date/time) voicemail inbound only [When you hear/read/see/feel what a y*ehudi plays/writes/sculpts/holds] [(n)either violinist {Menuhin} (n)or writer {"The Y*ehudi Principle"} (n)or molder (n)or older] [you must strive/think/look/sense all of it, or you will miss the meanings of it all] [EMAIL PROTECTED] Forwards only to: [EMAIL PROTECTED] CC: auto to: [EMAIL PROTECTED] Be short < 160 chars cuts off; currently offline [EMAIL PROTECTED] CC: auto to ^ http://www.authorsden.com/royacrabtree http://skyscraper.fortunecity.com/activex/720/resume/full.doc -- (c) RAC/IP, ARE,PRO,PAST (Copyright) Roy Andrew Crabtree/In Perpetuity All Rights/Reserved Explicitly Public Reuse Only Profits Always Safe Traded ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
