Can you make a simple example that looks like this u@v@w . Is it possible to write an explicit version that will create a tacit expression to do the same thing?
I don't have a problem with @: . My concern is only with @ Linda -----Original Message----- From: programming-boun...@jsoftware.com [mailto:programming-boun...@jsoftware.com] On Behalf Of Henry Rich Sent: Monday, December 05, 2011 9:28 PM To: Programming forum Subject: Re: [Jprogramming] Turkey Roll - Challenge 2 I don't understand why u@v is anything other than 'right to left'. It means do v, then do u. u@v@w means w, then v, then u. The complication of @ is not its ordering, it's its rank. In my classes I teach @: as a primitive. We don't use [:, or @ . Henry Rich On 12/5/2011 9:15 PM, Linda Alvord wrote: > > Compare your expression for dice : > > faces=: {&' o'@((i.3 3)e.&":"1])&.>4 80 840 8620 86420 865320 > faces > ------T-----T-----T-----T-----T-----┐ > │ │o │o │o o│o o│o o│ > │ o │ │ o │ │ o │o o│ > │ │ o│ o│o o│o o│o o│ > L-----+-----+-----+-----+-----+------ > > With Kip Murray's version: > > one =: ' ',' o ',:' ' > two =: 'o ',' ',:' o' > three =: 'o ',' o ',:' o' > four =: 'o o',' ',:'o o' > five =: 'o o',' o ',:'o o' > six =: 'o o','o o',:'o o' > ]dice =: one;two;three;four;five;six > ----T---T---T---T---T---┐ > │ │o │o │o o│o o│o o│ > │ o │ │ o │ │ o │o o│ > │ │ o│ o│o o│o o│o o│ > L---+---+---+---+---+---- > > Your dice are great looking! However that change has greatly increased the > complexity of the code. Also, there is a condition of the challenge to > exclude @ in each expression. This requirement encourages considering the > execution from the right toward the left. In your example 4 80 840 8620 > 86420 865320 could be puzzling to a beginner. Your other ideas are > thoughtful ideas to incorporate in an actual design of a program. At this > stage, I'm trying to raise issues that can be discussed and explored > further. > > From your design so far, is it possible for you to capture the actual values > of the and display them following each toss ? It is this data that will > be useful as you finish the challenge. > > Linda > > > -----Original Message----- > From: programming-boun...@jsoftware.com > [mailto:programming-boun...@jsoftware.com] On Behalf Of Raul Miller > Sent: Monday, December 05, 2011 9:50 AM > To: Programming forum > Subject: Re: [Jprogramming] Turkey Roll - Challenge 2 > > Personally, I have been baffled by a number of the choices and requirements > here. And, by this, I mean that I do not understand them. > > That said, here is my current interpretation of a mix of some of the > statements expressed here, about what is being accomplished: > > faces=: {&' o'@((i.3 3)e.&":"1])&.>4 80 840 8620 86420 865320 > toss=: (] {~ (?@$ #)) ".bind 'faces' > > Example use, with ascii box drawing enabled: > > toss 2 10 > +-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+ > |o |o |o o|o |o |o |o |o o|o o|o o| > | o | o | o | o | o | | | | o |o o| > | o| o|o o| o| o| o| o|o o|o o|o o| > +-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+ > |o |o o|o |o o|o o|o |o |o |o o|o | > | o | o | | o | | | | | | | > | o|o o| o|o o|o o| o| o| o|o o| o| > +-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+ > toss 2 10 > +-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+ > |o |o |o o|o |o o|o |o o|o o|o o|o | > | | | | o |o o| o | | o |o o| | > | o| o|o o| o|o o| o|o o|o o|o o| o| > +-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+ > |o o|o |o o|o o|o o|o o| |o o|o o|o o| > | | | o | | | o | o | | | | > |o o| o|o o|o o|o o|o o| |o o|o o|o o| > +-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+ > > Notes: > > 1. I spaced my pips out wider, horizontally, than the original. I think > this looks better. > 2. toss has 'faces' as an implicit dependency > 3. I can change the number of dice being tossed by changing the argument to > toss > > In my opinion, this is not a very good design. In "real life" code, I > would either replace (". bind 'faces') with (faces) or I would make it an > argument to the function. > > I could probably compress a few characters out of the definition of faces, > but it would become more mysterious if I did so. > ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
