Thanks for some hints that I found helpful. My issue was really about L: rather than : , but I missed that f=: 13 : will always be a verb. So maybe someday in the future, I'll write a conjunction.
Linda -----Original Message----- From: programming-boun...@forums.jsoftware.com [mailto:programming-boun...@forums.jsoftware.com] On Behalf Of Ric Sherlock Sent: Tuesday, October 16, 2012 5:43 AM To: programm...@jsoftware.com Subject: Re: [Jprogramming] stitching matrices Linda, The dictionary entry for the conjunction Explicit ( : ) [1] states that ( 13 : n ) will create a tacit verb if possible, and if not is equivalent to ( 3 : n ). In other words, it is not possible to create something other than a verb using that syntax. f=: @:*: type 'f' ┌──────┐ │adverb│ └──────┘ g=: 13 : '@:*:' type 'g' ┌────┐ │verb│ └────┘ h=: 1 : 'u@:*:' type 'h' ┌──────┐ │adverb│ └──────┘ +/ f 3 4 5 50 +/ g 3 4 5 |syntax error: g | +/ g 3 4 5 +/ h 3 4 5 50 [1] http://www.jsoftware.com/docs/help701/dictionary/d310n.htm On Tue, Oct 16, 2012 at 8:55 PM, Linda Alvord <lindaalv...@verizon.net> wrote: > A sad story: > > ]'A B'=:3|L:0(([:<i.)"1)3 5,:5 4 > ----------T-------┐ > │0 1 2 0 1│0 1 2 0│ > │2 0 1 2 0│1 2 0 1│ > │1 2 0 1 2│2 0 1 2│ > │ │0 1 2 0│ > │ │1 2 0 1│ > L---------+-------- > f=: 13 :'(([:<i.)"1)y' > f > ([: < i.)"1 > f C=:3 5,:5 4 > ---------------T-----------┐ > │ 0 1 2 3 4│ 0 1 2 3│ > │ 5 6 7 8 9│ 4 5 6 7│ > │10 11 12 13 14│ 8 9 10 11│ > │ │12 13 14 15│ > │ │16 17 18 19│ > L--------------+------------ > g=: 13 :'3|L:0 y' > g > 3 |L:0 ] > g f C > ----------T-------┐ > │0 1 2 0 1│0 1 2 0│ > │2 0 1 2 0│1 2 0 1│ > │1 2 0 1 2│2 0 1 2│ > │ │0 1 2 0│ > │ │1 2 0 1│ > L---------+-------- > 5!:4 <'f' > -- [: > ----+- < > -- " -+ L- i. > L- 1 > 5!:4 <'g' > -- 3 > │ -- | > --+- L: -+- 0 > L- ] > 'A B'=:g f C > A > 0 1 2 0 1 > 2 0 1 2 0 > 1 2 0 1 2 > B > 0 1 2 0 > 1 2 0 1 > 2 0 1 2 > 0 1 2 0 > 1 2 0 1 > > Because L: is a conjunction, I thought I had written my first > function that would be a conjunction. However, it is only a verb. > > 4!:0 <'f' > 3 > 4!:0 <'g' > 3 > > Linda > > > -----Original Message----- > From: programming-boun...@forums.jsoftware.com > [mailto:programming-boun...@forums.jsoftware.com] On Behalf Of R.E. > Boss > Sent: Tuesday, October 16, 2012 3:16 AM > To: programm...@jsoftware.com > Subject: Re: [Jprogramming] stitching matrices > > I do like the LHS (=/S:0 { ({:"1 A);({."1 B)) > > > R.E. Boss > > >> -----Oorspronkelijk bericht----- >> Van: programming-boun...@forums.jsoftware.com >> [mailto:programming-boun...@forums.jsoftware.com] Namens EelVex >> Verzonden: dinsdag 16 oktober 2012 7:14 >> Aan: programm...@jsoftware.com >> Onderwerp: Re: [Jprogramming] stitching matrices >> >> If elegant == short-tacit then Aai's way seems to be the best path to > take. >> >> Otherwise, `catalogue` presents some nice options, like: >> >> (=/S:0 { ({:"1 A);({."1 B)) # (;S:1 { <"1&.>A;}."1 B) >> >> >> >> >> On Mon, Oct 15, 2012 at 8:21 PM, Raul Miller <rauldmil...@gmail.com> > wrote: >> >> > Ok, thank you! I am going to blame my confusion about {: vs. {. on >> > my browser font, where both : and . get only a single pixel per dot >> > on my laptop's screen. I can see the difference if I focus on it, >> > but I should have copied those phrases rather than retyping them. >> > >> > That said... note that the asymmetric treatment of A and B ({: vs. {. >> > and the dropping of one column of B and the reordering of the >> > representation of B in the result) all require code to express. >> > >> > Also, the most concise expression would be O(A */@,&$ B) and and >> > it's tempting to try to make this more efficient, by keying on the >> > join column. But that leaves me with something like this:I >> > >> > join1=:4 :0 >> > jA=. {:"1 A=.x >> > jB=. {."1 B=.y >> > u=. jA ([ -. -.)&~. jB >> > uA=. (jA e. u) # A >> > tuB=. (jB e. u) # B >> > uB=. (/: u&i.@:({."1)) <mailto:u&i.@:({.> tuB >> > juA=. {:"1 uA >> > juB=. {."1 uB >> > bA=. juA </. uA >> > bB=. juB </. uB >> > ; bA ,/@:(,"1/)each bB >> > ) >> > >> > Something like Aai's proposal (;A ((,}.)"1 <@#~ (=&{: |.)"1)"1 _ B) >> > is going to be much more elegant, in my opinion... >> > >> > -- >> > Raul >> > >> > On Mon, Oct 15, 2012 at 12:33 PM, R.E. Boss <r.e.b...@planet.nl> wrote: >> > > NB. ({:"1 A) equals {."1 B >> > > so not the leading column of A >> > > >> > > Perhaps I should have added that ({:"1 A) =&~. {."1 B or all >> > > not matching rows are deleted. >> > > >> > > >> > > R.E. Boss >> > > >> > > >> > >> -----Oorspronkelijk bericht----- >> > >> Van: programming-boun...@forums.jsoftware.com [mailto: >> > programming-boun...@forums.jsoftware.com] Namens Raul Miller >> > >> Verzonden: maandag 15 oktober 2012 18:24 >> > >> Aan: programm...@jsoftware.com >> > >> Onderwerp: Re: [Jprogramming] stitching matrices >> > >> >> > >> Given your description, I would have expected a result like this: >> > >> >> > >> 0 1 2 0 1 1 2 0 >> > >> 0 1 2 0 1 1 2 0 >> > >> 2 0 1 2 0 0 1 2 >> > >> 1 2 0 1 2 2 0 1 >> > >> 1 2 0 1 2 2 0 1 >> > >> >> > >> I do not understand the result you proposed. >> > >> >> > >> Also, you have not specified what happens for rows where the >> > >> leading column of A has a value which does not appear in the >> > >> leading column of B. I can imagine several treatments for this case: >> > >> >> > >> 1) error >> > >> 2) join to a row of fills >> > >> 3) eliminate the row from the result >> > >> >> > >> Likewise for the reverse case, where the leading column of B has >> > >> a value which does not appear in the leading column of A. (And, >> > >> the asymmetric treatment of A and B, where one of the columns of >> > >> B does not contribute to the result, makes me wonder if the >> > >> treatment for >> > >> {."1 A not in {."1 B might be different from from the treatment >> > >> of >> > >> {."1 B not in {."1 A.) >> > >> >> > >> So... I am confused. Any clarification or explanation you can >> > >> provide could help. >> > >> >> > >> Thanks, >> > >> >> > >> -- >> > >> Raul >> > >> >> > >> On Mon, Oct 15, 2012 at 10:59 AM, R.E. Boss <r.e.b...@planet.nl> > wrote: >> > >> > Given >> > >> > >> > >> > ['A B' =. 3|L:0<@i."(1)3 5,: 5 4 >> > >> > +---------+-------+ >> > >> > |0 1 2 0 1|0 1 2 0| >> > >> > |2 0 1 2 0|1 2 0 1| >> > >> > |1 2 0 1 2|2 0 1 2| >> > >> > | |0 1 2 0| >> > >> > | |1 2 0 1| >> > >> > +---------+-------+ >> > >> > >> > >> > I want to stitch every row from A with all rows from B where >> > >> > ({:"1 A) >> > equals {."1 B and one of these columns is deleted. >> > >> > This will give me >> > >> > >> > >> > A foo B >> > >> > 0 1 2 0 1 2 0 1 >> > >> > 0 1 2 0 1 2 0 1 >> > >> > 2 0 1 2 0 1 2 0 >> > >> > 2 0 1 2 0 1 2 0 >> > >> > 1 2 0 1 2 0 1 2 >> > >> > >> > >> > Any elegant solutions? >> > >> > >> > >> > >> > >> > R.E. Boss >> > >> > >> > >> > -------------------------------------------------------------- >> > >> > - >> > >> > ------- 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 > ---------------------------------------------------------------------- > 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
