> is the following what you want ?
>
> 1 2 3 (+ ; * ; -) 6 7 8
Not quite. The example in my original email was probably overly minimal to be
completely unhelpful.
This is closer to what I am trying to do:
(+1:)`*`%`(+2:)@.(0 , (1 + 2&|) , 3:)"0 [ 5 6 NB. fictional usage
0.857143 56
The salient feature being that the choice of * or % depends on the argument. I
certainly could just compute both * and %, selecting the desired result post
facto, but I would like to avoid the unnecessary computation.
That said, perhaps I am just going about the solution in an entirely non-J way.
The problem is Advent of Code 2019, day 2, so I essentially have an array of
integers where each row is an "opcode". I am attempting to decode and execute
these opcodes. This is why I want to compute the arguments as well as the
operation from the input.
I certainly want to solve this on my own, but if I would love any pointers on
how to *think* about the problem in a J-ish way.
Jimmy Gauvin <[email protected]> wrote:
> Hi,
>
> is the following what you want ?
>
> 1 2 3 (+ ; * ; -) 6 7 8
> ┌──────┬───────┬────────┐
> │7 9 11│6 14 24│_5 _5 _5│
> └──────┴───────┴────────┘
>
>
>
> On Fri, Dec 6, 2019 at 9:54 PM ethiejiesa via Programming <
> [email protected]> wrote:
>
> > Am I just doing something silly? Or does @. really not support building
> > trains
> > when the right operand is a verb? Here is an overly minimal example of
> > what I
> > want:
> >
> > (1:)`+`(1:)@.(0 1 2) 0
> > 2
> > (1:)`+`(1:)@.(0 1 2"_) 0
> > |rank error
> > | (1:)`+`(1:)@.(0 1 2"_)0
> >
> > This is an obvious enough feature, that I feel I must be missing some
> > obvious
> > construction.
> >
> > For context, I was futzing around with this year's Advent of Code[0], day
> > 2,
> > and found myself wanting a fork-like that behaves as
> >
> > x (u v w) y <-> (x u y) (x v y) (x w y).
> >
> > After sufficient floundering, I decided to just read NuVoc for all
> > modifiers
> > and discovered that I had somehow not noticed the usefulness of @.
> > However, the
> > above restriction really surprised me.
> >
> > Anyway, happy holidays, J birds.
> >
> > [0]:https://adventofcode.com/2019/
> > ----------------------------------------------------------------------
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> >
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