The APL Orchard

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Adám

9:31 AM

Announcement: APLcart now includes all of dfns.dws for a total of 1000 entries.

1 hour later…

Adám

10:53 AM

@user19318 Hi Joel. Interested in APL too?

5 hours later…

TessellatingHeckler

4:04 PM

Dyalog partitioned-enclose, e.g. 1 0 0 1 0 0 ⊂ 'abcdef' turns into boxed [abc] [def], but Nars2000 and ngn/apl both turn it into a d and that feels like it's just doing part of what replicate would do.

I guess they're both valid different interpretations rather than bugs, but .. why are they different?

H.PWiz

Dyalog also has:

⎕←1 0 0 1 0 0⊆'abcdef'

Dyalog APL

@H.PWiz
┌─┬─┐
│a│d│
└─┴─┘

TessellatingHeckler

is that "partitioned nest" ?

H.PWiz

See that ⊆ can be used with a non-boolean left argument (Which is maybe also true for Nars)

J. Sallé

@TessellatingHeckler Yeah, that functionality is APL's ⊆. I don't know whether NARS or ngn's implementation have the left shoe underbar squiggle

TessellatingHeckler

4:11 PM

Nars has left-shoe-underbar but it means "subset" and appears to behave totally differently

H.PWiz

@TessellatingHeckler ⊆ is just "partition" in the docs

ngn

@TessellatingHeckler what dyalog's ⊂ does depends on ⎕ml. with ⎕ml←3 it's the same as the others.

TessellatingHeckler

@H.PWiz Oh I see; it's unary left shoe underbar which is Nest ( help.dyalog.com/17.0/Content/Language/Primitive%20Functions/… )

*monadic

@ngn so Dyalog is trying to improve on APL-2 but can be rolled back to be similar to it?

ngn

4:33 PM

@TessellatingHeckler i'm not sure what the order of events was. iirc, dyalog (or its predecessor dyadic ltd) had already released some versions before the apl2 spec was complete.

ngn

4:59 PM

@TessellatingHeckler here's the story as told by the implementers themselves: youtube.com/watch?v=WsmS4XBFvH0&t=817

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