It seems that [: is the problem: require 'trace' f=: 13 :'":,.p:y' f
trace '": ,. p: i.40' Try this. Linda -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of David Lambert Sent: Sunday, October 18, 2015 2:06 PM To: programming Subject: Re: [Jprogramming] Programming Digest, Vol 121, Issue 24 Need also double quote the space? trace'((1=[:+/"1'' ''~:f)+((1{"1 f)=2{"1 f)+3=[:+/"1 f=[:|:[:|.[:|:f)#f' This advances us from syntax to index error. >Date: Sat, 17 Oct 2015 23:32:34 -0400 >From: Raul Miller <[email protected]> >To: Programming forum <[email protected]> >Subject: Re: [Jprogramming] Finding prime palindromes >Message-ID: > <cad2jou_0ehozf9omcibxujayohfqmo__l9npiyff3s_tbgr...@mail.gmail.com> >Content-Type: text/plain; charset=UTF-8 > >You left out a value for y. > >Thanks, > >-- Raul On Sat, Oct 17, 2015 at 9:47 PM, Linda A Alvord <[email protected]> wrote: >> I tried "trace" to see what would happen to g. The results are strange. >> >> require'trace' >> f=: 13 :'":,.p:y' >> g=: 13 :'((1=+/"1 (f y)~:'' '')+((1{"1 f y)=2{"1 f y)+(3=+/"1 (f >> y)=|:|.|:f y))#f y' >> g i.40 >> 2 >> 3 >> 5 >> 7 >> 11 >> 101 >> 131 >> 151 >> f >> [: ": [: ,. p: >> g >> ((1 = [: +/"1 ' ' ~: f) + ((1 {"1 f) = 2 {"1 f) + 3 = [: +/"1 f = [: |: [: >> |. [: |: f) # f >> >> trace '[: ": [: ,. p:' >> --------------- 5 Trident ---- >> [: >> ,. >> p: >> [: ,. p: >> --------------- 5 Trident ---- >> [: >> ": >> [: ,. p: >> [: ": [: ,. p: >> ============================== >> >> trace '((1 = [: +/"1 ' ' ~: f) + ((1 {"1 f) = 2 {"1 f) + 3 = [: +/"1 f = >> [: |: [: |. [: |: f) # f' >> --------------- 3 Adverb ----- >> + >> / >> +/ >> --------------- 4 Conj ------- >> +/ >> " >> 1 >> +/"1 >> --------------- 5 Trident ---- >> = >> [: >> +/"1 >> = [: +/"1 >> --------------- 6 Bident ----- >> 1 >> = [: +/"1 >> |syntax error: executet >> | t_z=. (1)(=[:+/"1) >> >> linda >> >> -----Original Message----- >> From: [email protected] >> [mailto:[email protected]] On Behalf Of Linda A >> Alvord >> Sent: Friday, October 16, 2015 11:31 PM >> To: [email protected] >> Subject: Re: [Jprogramming] Finding prime palindromes >> >> Kip, That was a challenge! Soon someone will do it much more grcefully! >> Simplifications welcome. It is all done in characters. >> >> f=:[: ": [: ,. p: >> >> g=:((1 = [: +/"1 ' ' ~: f) + ((1 {"1 f) = 2 {"1 f) + 3 = [: +/"1 f = [: |: >> [: |. [: |: f) # f ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
