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- Robert G. Willhoft
- IBM Systems Journal
- 1991

This paper reports on an investigation of parallel expression and execution in the current APL2 language. The study covers a historical, theoretical, and empirical viewpoint. The parallel nature of APL is traced from its foundations in the Iverson notation to current problems in executing APL on parallel hardware. The paper discusses features of the APL… (More)

- Robert G. Willhoft
- APL
- 1991

APL and Fortran, although very different, share the challenge of remaining "competitive" in the light of an onslaught of "modern" computer languages. To meet this challenge, both have attempted to enhance their position by adding significant new features to their language. For example, APL2 is an extension of APL.Fortran has also attempted to meet the… (More)

- Robert G. Willhoft
- APL
- 1993

APL, although a very powerful language, has failed to gain wide acceptance in part due to its lack of control structures. A proposal is made for introducing structure in APL objects by adding to the items that can be located on the left of the colon (:). These <b>markers</b> show the beginning and ends of blocks of code and allow for selection, iteration,… (More)

- Robert G. Willhoft
- APLQ
- 1995

T<sc>HE NEED FOR</sc> a powerful, easy to use, parallel language continues despite very significant advances in the area of parallel processing. Many parallel languages are simply old sequential languages with parallel constructs added. This research describes the Data Parallel Language (DPL), a parallel language built from its foundations on parallel… (More)

- Robert G. Willhoft
- APL
- 1992

A Petri net is a graphical and mathematical modeling tool useful in the analysis of concurrent, asynchronous, distributed, parallel, nondeterministic, and/or stochastic systems. In addition, interest in Petri nets is increasing in the software community to model the behavior of parallel computer programs. The introduction of timed Petri nets allows system… (More)

- Robert G. Willhoft
- APL
- 1992

This paper deals with the use of APL to solve matrix theory problems with elements that are members of an integral domain. Two types of integral domains are used to illustrate the methods developed in this paper, integers (Z) and polynomials with real coefficients (Re[X]). However, the method of approach can be easily generalized to include other integral… (More)

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