APL

APL2 is one of the most exciting programming languages to evolve from IBM's original APL discovery. APL2 has been restricted to IBM 370 mainframe computers, due to the complexity of the interpreter required to implement all facets of the language.

This ...

A suite of APL programs is described for characterization of bounded images for on-line process control or for artificial intelligence recognition functions. Beginning with an acquired threshold and edge enhanced image, the programs:

• detect the edges and ...

A Modeling System named DYNAGRAPH has been developed on the IBM 5550 Personal Computer with NEXUS 5500 Graphics to interactively build dynamic simulation models using APL functions. A model for the simulation is represented by APL expressions in the ...

The firing squad problem of automata theory is described and a simple, nonoptimal solution is given. Examination of output traces shows that the solution has at least one obvious symmetry. If the transition matrix is reshaped and partitioned, the ...

Three extracts from a program currently in use are shown and discussed. The program reads seven files, formats the data as nested arrays, and prepares several reports and files. The examples are taken, respectively, from the input, process, and output ...

This paper gives a simple introduction to the concepts of Function Rank and the Rank Operator as they are defined in SHARP APL, and presents examples of their use. It shows the benefits, both in language design and in practice, of these concepts. ...

In order to co-ordinate APL code written for the European Commission, which has several different computers (mainframes, minis and micros) and thus several different APL's, a comprehensive set of programming standards was developed. The standards ...

As part of the I-APL project born at APL86 in Manchester. I was given the job of implementing a new APL interpreter which was portable, small enough to run on micro-computers in use in schools throughout the world, and fully compatible with the final ...

One environment in which APL has been strikingly successful is the APL system development group within I. P. Sharp Associates. The development of system programs requires a range of supporting applications for which APL is well suited. The usefulness of ...

This paper describes an APL2 application programmer tool which simplifies the development and implementation of APL2 applications which interact with SQL. The described tool consists of a suite of APL2 functions which provide a high level, easy-to-use, ...

At the conference APL87 held in Dallas, Dr. Tama Traberman referred to problems associated with Markov Processes. Her example showed a Markov matrix and gave an algorithm for finding powers of that matrix. In this paper we discuss two different ways of ...

To call this paper 'STATISTICIANS LOVE APL' would be self-deluding. To call it 'SOME STATISTICIANS LOVE APL' though vague would be accurate. However a balance then might be desirable by appending '… AND SOME STATISTICIANS HATE APL'. But that title would ...

APL (A Programming Language) has been in use at the Space Department of The Johns Hopkins University Applied Physics Laboratory (JHU/APL) for scientific problem solving. APL was a very attractive alternative to the slow, expensive and often unavailable ...

Computer Vision refers to the application of human vision techniques to a computer, simply put, teaching the computer to see. This branch of computer science is well rooted in several other branches, including: image processing, artificial intelligence, ...

The practice of modern finance theory depends on an ability to generate accurate and timely forecasts of asset returns. In this field, considerable effort has been expended to base the generation of asset returns on a set of state variables driven by ...

The task of evaluating the cumulative distribution of a normally distributed random variable is considered. A brief introduction into this problem is given and several possible approximations are presented as APL functions. Many of these functions have ...

This paper addresses the basic components of a system which facilitates the modeling of multi-dimensional data in terms of a relational database table. The name of the system is FLEXI-VIEW (XVU). FLEXI-VIEW is implemented in APL2 and runs on the IBM ...

Mathematically, an array may be usefully viewed as a function, in this particular case, as a function of its indices. A proposal is made for an operator which derives such a function for its array operand.

The proposal is discussed in the context of a ...

A preliminary framework for investigating certain extensions to APL is presented. This framework allows classification of some past and future language extensions according to their desirability from a functional point of view. Object classes and syntax ...

Traditionally, APL arrays have three parts: shape, type and elements. This notion is extended to include user defined and additional primitive parts. Functions are defined to manipulate parts. Keyed indexing is introduced to define parts, and also as an ...

The increasing popularity of finite element techniques to solve fluid flow problems has been due, in large part, to its geometric flexibility and adaptability. APL shares that property. Therefore, it is a natural companion to finite element modelling. ...

This paper describes the considerations involved in predicting the shapes of shadows cast by buildings for any hour, day or month of the year and for any location on Earth.

The power of APL is demonstrated in the general solutions possible for the ...

LISP and APL2 were both born in 1960's and they have the similar syntax which is called function type.

The main users of LISP were in the universities and the applications were linguistics or formula processing in mathematics.

On the other hand APL was ...

The Cooperative Processing Facility was designed to allow cooperation between active workspaces on a host and a workstation. This facility consists of two auxiliary processors on each system. When a workstation is connected to a host system by an ...

This paper describes two different menu-driven applications, in which APL software and the Statistical Analysis System (SAS) are used together. In one (TTK = The Statistical Database System) SAS is called during the execution of an APL application to ...

Since 1972, math-teachers at Shokei Jogakuin Senior High School have been using computers in their classes. In 1982, they changed from FORTRAN to APL, because APL had more possibilities for enriching math classes. At present, they are using APL Graphics ...

This paper presents a theoretical foundation for objects known as function arrays, which have been widely written about in past conferences. In contrast to the usual constructive approach, where the emphasis is on the method for creating function arrays,...

When Skandinaviska Enskilda Banken started trading bond options a pronounced need for a computerized trading support system arose. As the market changed, the demands on the system changed too, forcing it to evolve in several successive steps. The system ...