NDLI: Practical uses of a model of APL

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Volume 13, Issue 4, June 1983

Volume 13, Issue 3, March 1983

Volume 13, Issue 2, December 1982

Volume 13, Issue 1, September 1982

Exception handling in APL

Interactive design of neutron beam collimators using the Monte Carlo technique in APL

Nonpositional indexing for a relational data base

APL and the relational model

APL on a multiprocessor architecture

APLNET, a local computer network

Understanding arrays

The hunting of the Snark

ADONIS a dynamic APL interactive package for multivariate analysis

Problem solving with APL using micro-computers

Desirable extensions to APL for handling numerical multidimensional arrays

FITTEN - an APL workspace for nonlinear regression

Practicing on the CORE Graphics System

Semicolon-bracket notation

Uses of APL in a manufacturing environment

Experimental mathematics using APL and graphics

Adapting numerical algorithms to APL

APL full screen editing and error handling

APL in education

Practical uses of a model of APL

The use of APL primitives and function domains to produce general APL solutions to problems involving discontinuities

The use and disuse of APL

Management of a large block-diagonal macro-economic model in APL

NUMETH a user oriented programming system for interactive application of numerical methods

Computer arithmetic and programming languages

Using APL in an Artificial Intelligence environment

An APL simulation of feedback systems

Transparent files in APL (A Preliminary Proposal)

Extending Halstead's software science for a more precise measure of APL

A self-defining dynamic data management system using multiple access methods

Rectangularly arranged collections of collections

Extending APL “optional arguments”

A technique for producing graphical presentations with instances of a unit symbol

A financial modeling language using Nested Arrays

Teaching a topic in psychology with APL

Large arrays and files

A conceptual framework for the design of Market Simulations

Automated testing in APL—an application of exception handling

APL event / response programming

CPS - an APL conference planning system on a microcomputer

A survey of extensions to APL

Array diagrams and the Nial approach

Eigenanalysis and polynomial root finding primitive functions

A programming environment for blind APL-programmers

Computational simplicial homology in APL

Interactive multilevel definition of APL functions

APL - a boon to budgeting

Indexing infinite arrays

An APL-guided tour through the elements of multi-dimensional geometry

The impact of microcomputers on APL

The use of APL in a concurrent data flow environment

The application of an APL micro computer solving a commercial problem - a case study

Design considerations of a micro-based APL

A short-run forecasting model

A parser as a user-interface, driven by an enclosed array.

Practical uses of a model of APL

Content Provider	ACM Digital Library
Author	Iverson, Kenneth E. Whitney, Arthur T.
Abstract	This paper discusses the use of a general model of APL (written in APL) which allows convenient definition of new operators and functions and experimentation with their use. Use of the model is illustrated by a number of functions and operators, some of which have been previously discussed, and some (such as the operator til) which are new. Details of the model itself are not treated. The effective use of new facilities introduced into APL systems is often long delayed, not only because of a programmer's tendency to cling to familiar ways, but also because the abstract, formal treatment necessary to the specification of a new facility often makes its assimilation and use seem unduly difficult. Working models of new facilities available before their actual introduction can be very helpful in teaching their use, and very effective in speeding their widespread application. However, the development of an accurate model for each new facility can, especially in the case of new operators, be burdensome, and we have found that a general model of the APL interpreter, developed primarily for use by the language designers in the design and modelling of new extensions, can also be useful in providing specific models for the enlightenment of users. This paper discusses such uses of the general model, employing illustrations executed by the version available on the I.P. Sharp Associates APL system. Except for information necessary for understanding its use, details of the model will not be discussed here. The model incorporates a number of facilities proposed in earlier papers [1 2 3]; the more fundamental among them are illustrated below. The model, invoked by executing the function ΔAPL, accepts character input and parses and executes the expression entered. 0-origin indexing is used throughout the paper.
Starting Page	140
Ending Page	145
Page Count	6
File Format	PDF
ISSN	01636006
DOI	10.1145/390006.802236
Journal	ACM SIGAPL APL Quote Quad (APLQ)
Volume Number	13
Issue Number	1
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	1988-12-01
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Content Type	Text
Resource Type	Article

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