Re: APL in PS

Newsgroups	comp.lang.postscript
Date	2014-03-08 02:15 -0800
References	<c50c5138-a763-4d96-8ae0-b900f06cbb68@googlegroups.com> <becdd894-cacd-4611-b5f3-5733b8fef13e@googlegroups.com> <16465a32-b57b-4ac3-9c1f-69899489eb00@googlegroups.com>
Message-ID	<defe9ec9-e0a2-4fb7-81da-6c3ab9aefdaf@googlegroups.com> (permalink)
Subject	Re: APL in PS
From	luser- -droog <mijoryx@yahoo.com>

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On Saturday, March 8, 2014 1:25:15 AM UTC-6, luser- -droog wrote:
> On Friday, March 7, 2014 11:31:35 AM UTC-6, Ross Presser wrote:
> 
> > On Friday, March 7, 2014 2:01:34 AM UTC-5, luser- -droog wrote:
> 
> > > It seems appropriate to archive this here as well as
> > > 
> > > https://gist.github.com/luser-dr00g/9382217
> > > 
> > > This code attempts to build-up enough APLisms to implement
> > 
> > *sound of brain exploding*
> 
> Richard Dreyfuss gesturing at the mashed potatoes:
> "This *means* something!"
> 
> I confess I don't understand any more APL than I've written there, 
> and some of that's a little shaky, too.
> At the very end there's a unzip/zip-array operation with that
> single '*' in the middle. Somehow, it makes a multiplication
> table. But without the "exch", it doesn't. But I don't know why.
> 

Updated the gist with the part I'm talking about here. This is the
line that makes a multiplication table:

    [3 1 roll{1 index * exch}forall pop]

> 
> 
> Oh, wait a mom. Yes I do. That's not APL's fault. That's because,
> it doesn't check the second argument if the first is not an array.
> It's because I cut corners at the top of the page. :(
> 
> I'm still trying to grok the "J incunabulum", with some limited
> success (and lots of helpful search results), but the real
> secret, I suspect is in the 1962 volume: A Programming Language.
> But annoyingly, it uses slightly different symbols and conventions
> from every other version.

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Thread

APL in PS luser- -droog <mijoryx@yahoo.com> - 2014-03-06 23:01 -0800
  Re: APL in PS Ross Presser <rpresser@gmail.com> - 2014-03-07 09:31 -0800
    Re: APL in PS luser- -droog <mijoryx@yahoo.com> - 2014-03-07 23:25 -0800
      Re: APL in PS luser- -droog <mijoryx@yahoo.com> - 2014-03-08 02:15 -0800

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