Proof read your NB ! Sent from my iPad
On Jan 12, 2013, at 8:51 AM, "Linda Alvord" <lindaalv...@verizon.net> wrote: > Here's a sentence that I think would be more helpful in the vocabulary: > > ]A=:'one';'two';'three' > ┌───┬───┬─────┐ > │one│two│three│ > └───┴───┴─────┘ > #&>A > 3 3 5 > ([:#>)">A > 3 3 5 > ^ > NB. Then shouldn't the vocabulary say u&v y -> ([: u v y)"v > > A similar sentence for @ might save beginners a lot of anguish. > > Linda > > -----Original Message----- > From: programming-boun...@forums.jsoftware.com > [mailto:programming-boun...@forums.jsoftware.com] On Behalf Of km > Sent: Saturday, January 12, 2013 4:20 AM > To: programm...@jsoftware.com > Subject: Re: [Jprogramming] joining to an empty list > > You have quoted the vocabulary entry correctly, but must interpret the first > sentence in the light of the third. (Look at the entry again and count > periods to locate the first and third sentences.) > > Your usual tools can help: > > f =: 13 : '#&> y' > f > #&> > g =: 13 : '# > y' > g > [: # > > > Because > has ranks 0 0 0 and monad #&> is equivalent to #@>, monad #&> is > equivalent to > > h > ([: # >)"0 > > f 'one';'two';'three' > 3 3 5 > h 'one';'two';'three' > 3 3 5 > g 'one';'two';'three' > 3 > > Kip Murray > > Sent from my iPad > > > On Jan 12, 2013, at 1:37 AM, "Linda Alvord" <lindaalv...@verizon.net> wrote: > >> My issue is with the vocabulary. Here is compose: >> >> u&v y ↔ u v y . Thus +:&- 7 is _14 (double the negation). Moreover, the >> monads u&v and u@v are equivalent. >> >> f=: 13 :'#&>y' >> f 'one';'two';'three' >> 3 3 5 >> >> g=: 13 :'#>y' >> g 'one';'two';'three' >> 3 >> >> I play the part of a perpetual beginner. When a statement is in the >> vocabulary I should be able to trust that it will work. As I see it, it >> does not work. >> >> My question is why not? >> >> Linda >> >> -----Original Message----- >> From: programming-boun...@forums.jsoftware.com >> [mailto:programming-boun...@forums.jsoftware.com] On Behalf Of Linda Alvord >> Sent: Saturday, January 12, 2013 2:19 AM >> To: programm...@jsoftware.com >> Subject: Re: [Jprogramming] joining to an empty list >> >> Fortunately it shows up in my sent messages in small print. >> >> Linda >> >> -----Original Message----- >> From: programming-boun...@forums.jsoftware.com >> [mailto:programming-boun...@forums.jsoftware.com] On Behalf Of Raul Miller >> Sent: Friday, January 11, 2013 10:14 PM >> To: programm...@jsoftware.com >> Subject: Re: [Jprogramming] joining to an empty list >> >> On Fri, Jan 11, 2013 at 10:07 PM, Linda Alvord <lindaalv...@verizon.net> >> wrote: >>> I don't understand why f and g do not agree? >> >> Because they are doing something different. >> >>> #&>'one';'two';'three' >>> 3 3 5 >>> f=: 13 :'#&>y' >>> f 'one';'two';'three' >>> 3 3 5 >> >> f counts the number of items in each box. >> >>> NB. Compose: u&v y ↔ u v y >>> >>> g=: 13 :'#>y' >>> g=: 13 :'#>y' >>> g 'one';'two';'three' >>> 3 >> >> g counts the number of items after unboxing. >> >> Let's try replacing # with < >> >> <@> 'one';'two';'three' >> +---+---+-----+ >> |one|two|three| >> +---+---+-----+ >> <> 'one';'two';'three' >> +-----+ >> |one | >> |two | >> |three| >> +-----+ >> >> Or, let's change the data and use $ >> >> $@> i.each 2 2; 3 3; 4 4 >> 2 2 >> 3 3 >> 4 4 >> $> i. each 2 2; 3 3; 4 4 >> 3 4 4 >> >> Remember that > has rank 0 so F@> is going to run an independent instance of >> F for each box that you are unpacking. >> >> Does this help? >> >> -- >> Raul >> ---------------------------------------------------------------------- >> For information about J forums see http://www.jsoftware.com/forums.htm >> >> ---------------------------------------------------------------------- >> For information about J forums see http://www.jsoftware.com/forums.htm >> >> ---------------------------------------------------------------------- >> For information about J forums see http://www.jsoftware.com/forums.htm > ---------------------------------------------------------------------- > For information about J forums see http://www.jsoftware.com/forums.htm > > ---------------------------------------------------------------------- > For information about J forums see http://www.jsoftware.com/forums.htm ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
