<;.1 x <;.1 x There is no syntax error when x is not defined.
Instead, the result is a (useless) hook. If you had tried to use that hook you would have gotten a value error. -- Raul 2012/3/9 Linda Alvord <lindaalv...@verizon.net>: > Your explanations helped a lot. One last puzzle. How can there be a result > when there is no x ? I start up and do this first in jijx . Is it timing > a syntax error of some sort? > > J Http Server > > timer=: 6!:2 > 10 timer '<;.1 x' > 5.73397e_6 > 5.99238e_6 > 5.99238e_6 > x > |value error: x > > > Linda > > -----Original Message----- > From: programming-boun...@jsoftware.com > [mailto:programming-boun...@jsoftware.com] On Behalf Of Roger Hui > Sent: Friday, March 09, 2012 1:35 AM > To: Programming forum > Subject: Re: [Jprogramming] Sequential Machine > > x was defined in my msg; it was: > > x=: 1e6$' the quick brown fox jumps over the lazy dog' > new > It is hard to draw any conclusions on arguments as small as those used in > your msg. However, anything in J coming within a factor of 2 of handcoded > C, as in the timings in your example, is an accomplishment. > > > > 2012/3/8 Linda Alvord <lindaalv...@verizon.net> > >> When I tried your example I got a result for the variable x when it >> was not defined. That's a neat trick! You probably timed a variable >> that differed from the "fox" sentence as our results are quite >> different. Also, my results are also not as close as you indicated. >> >> state=: 3 2 2$ 1 1 2 1 2 0 2 2 1 0 2 2 >> S=:0;state;<a.={.a >> (S&;: -: <;.1) k=:' the quick brown fox jumps over the lazy dog' >> 1 >> timer=: 6!:2 >> >> 10 timer '<;.1 x' >> 5.85968e_6 >> 10 timer 'S&;: x' >> 7.87111e_6 >> x >> |value error: x >> >> timer '<;.1 '' the quick brown fox jumps over the lazy dog''' >> 1.61333e_5 >> timer 'S&;: '' the quick brown fox jumps over the lazy dog''' >> 2.57016e_5 >> >> -----Original Message----- >> From: programming-boun...@jsoftware.com >> [mailto:programming-boun...@jsoftware.com] On Behalf Of Roger Hui >> Sent: Thursday, March 08, 2012 10:05 PM >> To: Programming forum >> Subject: Re: [Jprogramming] Sequential Machine >> >> Yes it is. The example looks strange because the first character of a >> is "a", not normally used as a separator. If the first character is a >> blank (say), then it looks more normal. e.g. >> >> state=: 3 2 2$ 1 1 2 1 2 0 2 2 1 0 2 2 >> a=: ' a good way to start the day' >> (0;state;<a.={.a);:a;:a >> ---T-----T----T---T------T----T----┐ >> │ a│ good│ way│ to│ start│ the│ day│ >> L--+-----+----+---+------+----+----- >> <;.1 a >> ---T-----T----T---T------T----T----┐ >> │ a│ good│ way│ to│ start│ the│ day│ >> L--+-----+----+---+------+----+----- >> S=: 0;state;<a.={.a >> (S&;: -: <;.1) a >> 1 >> (S&;: -: <;.1) ' the quick brown fox jumps over the lazy dog' >> 1 >> x=: 1e6$' the quick brown fox jumps over the lazy dog' >> (S&;: -: <;.1) x >> 1 >> >> Now the thing that surprised me when I saw it the first time: >> >> timer=: 6!:2 >> 10 timer '<;.1 x' >> 0.0630174 >> 10 timer 'S&;: x' >> 0.0675069 >> >> <;.1 is implemented using hand-coded C. >> >> >> >> 2012/3/8 Linda Alvord <lindaalv...@verizon.net> >> >> > Roger, I'm not sure that this is what you had in mind. >> > >> > >> > a=:'a good way to start the day' >> > <;.1 a >> > ---------T--------T---------T--┐ >> > │a good w│ay to st│art the d│ay│ >> > L--------+--------+---------+--- >> > state=: 3 2 2$ 1 1 2 1 2 0 2 2 1 0 2 2 >> > (0;state;<a.={.a);:a >> > ---------T--------T---------T--┐ >> > │a good w│ay to st│art the d│ay│ >> > L--------+--------+---------+--- >> > >> > >> ---------------------------------------------------------------------- >> 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
