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Abstract for APL2007
Tutorial , Montreal , Oct 21-23
Melding Moore and Iverson : An Open
Abstracted APL built in Forth for Intel processors .
The philosophical goal of Charles
Moore's FORTH is to define the minimal vocabulary
capable of extending itself; Ken Iverson's goal was to define the
maximally meaningful notation . The goal of 4th.CoSy is to abstract the
structures and syntax of Iverson's APL in modern
Forth, free and open down to the Intel ( or future ) primitives, to
create a powerful personal computing environment for the everyday
business of life.
Those interested in this tutorial
should download the current version of 4th.CoSy
and have it
with them on a laptop. The tutorial will, thru example,
Show Forth's very simple :
- structure : ( dictionary ;
dataStack , returnStack ; interpreter )
- syntax : ( read a word ( delimited
by whitespace ) , look it up , interpret it )
Show the APL and K informed CoSy structures and vocabulary :
- Everything is either a list ( of
pointers ) or something else
- All objects are allocated and
reference counted
- A dictionary ( including the root R
) is a list of 2 correlated lists :
- a list of symbols
- a list of their values
- Dictionaries also have a third
item : a list of attribute dictionaries for the symbols .
- Indexing is modulo
- Generally verbs work on on lists .
Like K , nested lists are reached thru each
and flip
- Particular interesting APLish
verbs and adverbs
- All objects have a default display
, ala K
- Total environment saved in
dictionary , ala APL workspace
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has
created
perhaps the most powerful executive computing environments in the most
advanced 
