I was confused for a moment when you said "The linear display of ({:}
}:) is wrong."
But then I saw that you meant the linear display of ({:} }) in the
error message for ({:} })t
It can also be instructive to try that expression:
9!:3(5)
({:}}:)
{:} }:
In other words, in the current version of J, at least, when there's no
opening {{ a }} pair is not treated as a delimiter.
That's arguably for the best. (Though for old J hands, it also
suggests that smiley/frowny delimiters -- in other words (: ): --
might have been more comfortable for us.)
Thanks,
--
Raul
On Fri, Dec 10, 2021 at 10:51 AM Henry Rich <[email protected]> wrote:
>
> What you have is
>
> ({:} }:)t
>
> t {:} }: t
>
> [This is u}]
>
> t (t {: }: t)} }: t
>
>
> The linear display of ({:} }:) is wrong.
>
> From your NuVoc ref it appears you want to use monad u}, but you are
> using the dyad here.
>
> Henry Rich
>
>
> On 12/10/2021 10:24 AM, R.E. Boss wrote:
> > I'm trying to solve the AdventOfCode puzzles, but at least half of my time
> > I spend on troubles with J.
> > Mostly I make mistakes, because the rules of J are less intuitive then I
> > presumed, but there is also inexplicable behavior, so in the end, J remains
> > a black box for me.
> >
> > t
> > 3 1 4 1 2 1 1 8 8 3 6 7 3 3 4 3 6 4 2 1 8 2 7 7
> > _6 _8 _5 _8 _7 _8 _8 _1 _1 _6 _3 _2 _6 _6 _5 _6 _3 _5 _7 _8 _1 _7 _2 _2
> > 0 0 0 0 0 0 0 1 1 0 1 1 0 0 0 0 1 0 0 0 1 0 1 1
> >
> > ({:} }:)t
> > |domain error
> > | ({:}}:)t
> >
> > obviously }} is interpreted as part of a direct definition, red in JQT,
> > despite my blank.
> >
> > (}:}~ {:) t
> > |domain error
> > | (}:}~{:)t
> >
> > black box in optima forma.
> >
> > Fortunately, as NUVOC mentions, } is a replacement of ( {"0 1&.|: ).
> > But it cost me too much time, reason to timebox my efforts for AOC.
> >
> >
> > R.E. Boss
> > ----------------------------------------------------------------------
> > For information about J forums see http://www.jsoftware.com/forums.htm
>
>
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