Henry, I got a few days behind in email and I can't figure out your line:
f=:,
g=:,.
h=:|.
f`g`h/'cat';'dog';''
┌───┬───┬─┐
│cat│dog│ │
└───┴───┴─┘
f=:+:
g=:*:
h=:%:
f`g`h/3;6;9
f`g`h/3;6;9
|domain error: g
| f`g`h/3;6;9
Linda
-----Original Message-----
From: Programming [mailto:[email protected]] On Behalf
Of Henry Rich
Sent: Tuesday, February 9, 2016 7:44 AM
To: [email protected]
Subject: Re: [Jprogramming] Nested structures. Idioms? Combinators?
Look at
c0`c1`c2/ p0;p1;p2;''
Henry Rich
On 2/9/2016 4:59 AM, Matthew Baulch wrote:
> Suppose I wish to construct a complex, non-regular deeply nested structure:
> to model some inherently non-linear system. A natural approach (for
> me,
> anyhow) is to construct a library of combinators, or a domain specific
> language, with which to specify the (boxed) structure.
>
> J rises easily to the task, and before long I'm looking at long
> function trains of the form
>
> myStruct =: c0 p0 c1 p1 c2 p2 ... cN pN
>
> where the ci are (combinator) verbs, and the pj are (parameter) nouns.
> Nice. Easy.
>
> Only trouble is, N may be large and J prefers such statements to sit
> on a single line. Correct? I can split my definition:
>
> msPartA =. .....
> msPartB =. .....
> .....
> msPartX =. .....
> myStruct =: msPartA msPartB .... msPartX
>
> though this feels awkward. The most obvious issue is that the PartA,
> ..., PartX are distracting; unless of course I can find a natural way
> of splitting and naming them. Ideally, the parts should be as close to
> a comfortable line width as possible. Again, awkward. If myStruct1 and
> myStruct2 have the same partitioning scheme but myStruct2 (for
> instance) is much larger than myStruct1, there will be many sparsely,
> or many overpopulated lines. Awkward too.
>
> I love J. It handles complex regular data so elegantly. How can I
> bring similar elegance to irregular data? Can my combinators be
> rescued, or should I use another approach?
> ----------------------------------------------------------------------
> 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
