Examples of event handling in APL2

Graham, Alan

doi:10.1145/800062.801206

Proceedings of the International Conference on APL - APL '83 1983

DOI: 10.1145/800062.801206

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Examples of event handling in APL2

Alan Graham

Abstract: Event handling is a feature that has recently been added to many APL systems. IBM's VSAPL release 4.0 and APL2 include a dyadic system function DEA (Execute Alternate)" which provides a simple event handling facility.This dyadic function can easily be simulated using the event handling facilities offered by other vendors.

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1984

1985

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Array oriented exception handling

Lucas

1985

SIGAPL APL Quote Quad

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APL still deals poorly with some aspects of real world problems. For instance, frequently to mark entries in an otherwise numeric database as “not applicable” or “not entered,” one picks arbitrarily one or more numbers to represent the attributes. But this and other approaches suffer difficulties ranging from ambiguity to inefficiencies in both programming and execution. Further, APL errors which might logically be associated with individual elements of data arrays are not reported by existing APL systems in any detail. This paper proposes an enhancement to APL which would overcome both these difficulties, discussing considerations of both use and implementation.

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Array oriented exception handling

Lucas

1985

SIGAPL APL Quote Quad

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Polyvalent functions, operators, strand notation and their precedence

Naugle

Schlam²

1984

SIGAPL APL Quote Quad

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Functions and operators that take any number of arguments are proposed. Examples in current APL are shown. Function subvalence and polyvalent defined functions are established. Polyvalent primitive functions respond as follows: 644 ( A A+A ),( A A+ ), +A A ←2 Current operator usage, operator subvalence, polyvalent defined operators are explored. A polyvalent primitive product operator and polyvalent returns are examined. Precedence rules are studied. Polyvalent low strand precedence works as follows: 4096 A A & times;A A+A ←4

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Examples of event handling in APL2

Cited by 2 publications

References 0 publications

Array oriented exception handling

Array oriented exception handling

Polyvalent functions, operators, strand notation and their precedence

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