I have an implementation of a "tree builder" interface here: http://tangentstorm.github.io/apljk/treebuild.ijs.html
Rather than using a boxed array to build a tree, it uses a single array to represent the parent links for all nodes. The actual data can be stored in any number of parallel arrays. I also have a very simple graph database (triple store) here: https://github.com/tangentstorm/syndir/blob/master/graphdb.ijs Also an implementation of s-expressions (which you can stick in a ( 0 : 0 ) block. https://github.com/tangentstorm/syndir/blob/master/boxer.ijs On Tue, Feb 9, 2016 at 3:59 AM, Matthew Baulch <[email protected]> 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
