I thought I had written about it, but could not find it in
J Forums, neither on my websites. It turns out it is
dated circa Jun 1998 and resides on comp.lang.apl.
artificial polymorphism model as of J 401
http://groups.google.com/group/comp.lang.apl/msg/9a5709a6ba91433d
Note: the last loop can be encapsulated in a convenience
conjunction.
Also related is the topic of "Distributed Apply"
http://www.jsoftware.com/jwiki/Essays/Distributed%20Apply
----- Original Message ----
> From: Matthew Brand <[email protected]>
>
> If I have a simple class such as:
> coclass 'example'
>
> create =: 3 : ' X =: y'
> destroy =: codestroy
>
> And I make a list of new objects:
> n =.'example' (conew~)"(1 0) i.4
>
> n
> +-+-+-+-+
> |4|5|6|7|
> +-+-+-+-+
>
> Then I can get at the X's inside each object like this:
> X_4_
> 0
> X_5_
> 1
>
> And like this:
> v =. <":5
> X__v
> 1
>
> But how can I reconstruct the values of the X's from the list n?
>
> i.e., is there anything that looks like this?
> (X__ )"0 n
> 0 1 2 3
>
> Presumably the code to call a method on each object would look the same?
>
> I.e if there was a method: getX =: 3 : 'X'
>
> then calling it would look like?
> (getx__ )"0 n
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