I can think of many reasons to go from tacit to explicit and one of the biggest is understanding the tacit expression better.
It is relatively easy to create tacit from explicit and understand what is happening. Going the other way around is a major hurdle for people starting out using J and explaining one short tacit line may need a whole page of text. Being able to go from tacit to explicit and for example explaining the trace of the expression could be a good start and I think this kind of work is very important and well worth doing. I guess that people are often too embarrassed to ask what an tacit expression is really doing and why/how it works 2011/10/7 Bo Jacoby <[email protected]> > > > Why, Linda, do you ever want to go from the tacit expression to an explicit > expression? > > a =: ((+/ % #) * 1 + #) - +/ > a 90 90 90 > 90 > NB. ((+/ % #) * (1 + #)) === (((+/ % #) * 1) + ((+/ % #) * #)) === ((+/ % > #) + ((+/)) > a =: +/ % # > a 90 90 90 > 90 > > > > > > >________________________________ > >Fra: Björn Helgason <[email protected]> > >Til: Programming forum <[email protected]> > >Sendt: 13:16 fredag den 7. oktober 2011 > >Emne: Re: [Jprogramming] Tacit vs. Explicit > > > >Is this what you are looking for? > > > > load'c:\j701\addons\general\misc\trace.ijs' > > trace'(((+/ % #) * 1 + #) - +/)90 90 90' > > > > > >2011/10/7 Linda Alvord <[email protected]> > > > >> Is there a way to go from a tacit expression to find the correct > explicit > >> expression? > >> > >> a =: 13 :'((+/ % #) * 1 + #) - +/' > >> a 90 90 90 > >> |syntax error: a > >> | a 90 90 90 > >> > >> b=:((+/ % #) * 1 + #) - +/ > >> b 90 90 90 > >> 90 > >> > >> c =: 13 :'((+/ % #) * 1 + #) - +/y' > >> c 90 90 90 > >> _540 > >> > >> d =: 13 :'((+/ % #) * 1 + #y) - +/y' > >> d 90 90 90 > >> _269 > >> > >> e=: 13 :'((+/ % #y) * 1 + #y) - +/y' > >> e 90 90 90 > >> _268.667 > >> > >> > >> a > >> 3 : '((+/ % #) * 1 + #) - +/' > >> b > >> ((+/ % #) * 1 + #) - +/ > >> c > >> [: ((+/ % #) * 1 + #) [: - +/ > >> d > >> ([: (+/ % #) [: * 1 + #) - +/ > >> e > >> (([: +/ [: % #) * 1 + #) - +/ > >> > >> > >> > >> 5!:4 <'a' > >> > >> -- 3 > >> -- : -+- ,:'((+/ % #) * 1 + #) - +/' > >> > >> > >> 5!:4 <'b' > >> > >> -- / --- + > >> ----+- % > >> │ L- # > >> ------+- * > >> │ │ -- 1 > >> │ L---+- + > >> --+ L- # > >> +- - > >> L- / --- + > >> > >> > >> 5!:4 <'c' > >> > >> -- [: > >> │ -- / --- + > >> │ ------+- % > >> │ │ L- # > >> +----+- * > >> --+ │ -- 1 > >> │ L-----+- + > >> │ L- # > >> │ -- [: > >> L----+- - > >> L- / --- + > >> > >> > >> 5!:4 <'d' > >> > >> -- [: > >> │ -- / --- + > >> +----+- % > >> │ L- # > >> ------+ > >> │ │ -- [: > >> │ │ +- * > >> │ L----+ -- 1 > >> --+ L-----+- + > >> │ L- # > >> +- - > >> L- / --- + > >> > >> > >> > >> > >> > >> 5!:4 <'e' > >> > >> -- [: > >> +- / --- + > >> ----+ > >> │ │ -- [: > >> │ L-----+- % > >> ------+ L- # > >> │ +- * > >> │ │ -- 1 > >> --+ L---+- + > >> │ L- # > >> +- - > >> L- / --- + > >> > >> Do you get the answer you want with b, c, d or e? I would have guessed > it > >> should be b , that doesn't seem to be very helpful. > >> > >> -----Original Message----- > >> From: [email protected] > >> [mailto:[email protected]] On Behalf Of Henry Rich > >> Sent: Wednesday, October 05, 2011 5:25 AM > >> To: Programming forum > >> Subject: Re: [Jprogramming] Tacit vs. Explicit > >> > >> bestfit=:(],0{&<.&<.0.5+(1+0.01*_15+(?@(30"_)))*(((+/ % #)*1+#)-(+/))) > >> bestfit 90 90 90 > >> 90 90 90 101 > >> bestfit 90 90 90 > >> 90 90 90 102 > >> bestfit 90 90 90 > >> 90 90 90 103 > >> bestfit 90 90 90 > >> 90 90 90 78 > >> > >> Henry Rich > >> > >> On 10/5/2011 5:19 AM, Gian Medri wrote: > >> > Hi! > >> > I have a function: > >> > bestfit=:(],0{&<.&<.0.5+(1+0.01*(?30)-15)*(((+/ % #)*1+#)-(+/))) > >> > that calculates the n+1 element. > >> > bestfit 90 90 90 > >> > 90 90 90 81 > >> > The tacit form doesn't work properly, because the "?" is not active > every > >> > time I call bestfit 90 90 90. > >> > When I use > >> > (],0{&<.&<.0.5+(1+0.01*(?50)-25)*(((+/ % #)*1+#)-(+/))) 90 90 90 > >> > then the function works properly. > >> > > >> > My question is if it is possible to have a tacit verb with the "?" > >> active. > >> > > >> > Thanks > >> > > >> > Gian Medri > >> > ---------------------------------------------------------------------- > >> > 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 > >> > > > > > > > >-- > >Björn Helgason, Verkfræðingur > >Fornustekkum II > >781 Hornafirði, > >t-póst: [email protected] > >gsm: +3546985532 > >twitter: @flugfiskur > >http://groups.google.com/group/J-Programming > > > > > >Tæknikunnátta höndlar hið flókna, sköpunargáfa er meistari einfaldleikans > > > >góður kennari getur stigið á tær án þess að glansinn fari af skónum > > /|_ .-----------------------------------. > > ,' .\ / | Með léttri lund verður | > > ,--' _,' | Dagurinn í dag | > > / / | Enn betri en gærdagurinn | > > ( -. | `-----------------------------------' > > | ) | (\_ _/) > > (`-. '--.) (='.'=) ♖♘♗♕♔♙ > > `. )----' (")_(") ☃☠ > >---------------------------------------------------------------------- > >For information about J forums see http://www.jsoftware.com/forums.htm > > > > > ---------------------------------------------------------------------- > For information about J forums see http://www.jsoftware.com/forums.htm > -- Björn Helgason, Verkfræðingur Fornustekkum II 781 Hornafirði, t-póst: [email protected] gsm: +3546985532 twitter: @flugfiskur http://groups.google.com/group/J-Programming Tæknikunnátta höndlar hið flókna, sköpunargáfa er meistari einfaldleikans góður kennari getur stigið á tær án þess að glansinn fari af skónum /|_ .-----------------------------------. ,' .\ / | Með léttri lund verður | ,--' _,' | Dagurinn í dag | / / | Enn betri en gærdagurinn | ( -. | `-----------------------------------' | ) | (\_ _/) (`-. '--.) (='.'=) ♖♘♗♕♔♙ `. )----' (")_(") ☃☠ ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
