Technical skill is mastery of complexity, while creativity is mastery of simplicity Erik Christopher Zeeman

Another time when I was concerned about getting credit for some idea I had, [ Ken Iverson ] said, "Arthur, if it's a really good idea, you're going to have to shove it down people's throats." Arthur Whitney : Memories of Ken

It is better to have 100 functions operate on one data structure than 10 functions on 10 data structures. Alan Perlis : Epigrams in Programming #9

MinnowBrook 2011

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

has created perhaps the most powerful executive computing environments in the most advanced Array Programming Languages . Generally I have been the sole user of these environments .

My focus nowdays is the creation of a truly commercial CoSy build from the FORTH up incorporating all I have learned over the decades about simple powerful transparent structure and language . Browse the evolution and history of CoSy to get a sense of my goal . I've gotten enough code working now in Ron Aaron's Reva to present to FORTH programmers for use as a system of dynamic lists with much of the power of a 0th generation APL . See the Reva Forum for discussion of ongoing work and issues and for documentation and downloads of Reva . I often post uploads of CoSy code there , but a current copy is available at the link below . Here are links to current comentary and documentation of :   Current Code 4th.CoSy Forum Structural Overview Comments in E o 2005 NewsLetter First bit of User Manual ( FORTH level) CoSy NewsLetter 2006 Summer Presenting 4th.CoSy at APL Moot , Surrey Reva Vocabulary   Other documents and commentary over last couple of years

Past Tense :

Quantitative Analytics turn your thoughts into computations

APL Consulting

For the most extreme computational tasks , K.CoSy , created in open code in Arthur Whitney`s language K , provides an uniquely productive environment . By its nature , CoSy provides an APL-like workspace environment previously impossible in K which is itself perhaps the fastest and one of the most expressive languages yet created . Click K.CoSy for details .

/ Bob A /