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Empty arrays in extended APL

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1 Author(s)
Orth, D.L. ; IBM Research Division, P.O. Box 218, Yorktown Heights, New York 10598, USA

During the past several years considerable work has been done on extending APL in three areas: operators, heterogeneous data, and nested data. In each area a proposed extension must treat empty arrays consistently. In this paper various possibilities for providing consistent behavior are presented. The new proposals possess at least one of two important qualities in which older proposals tend to be deficient: consistent behavior is independent of the structural properties of rank and nesting, and the user has control over the behavior when he wants it.

Note: The Institute of Electrical and Electronics Engineers, Incorporated is distributing this Article with permission of the International Business Machines Corporation (IBM) who is the exclusive owner. The recipient of this Article may not assign, sublicense, lease, rent or otherwise transfer, reproduce, prepare derivative works, publicly display or perform, or distribute the Article.  

Published in:

IBM Journal of Research and Development  (Volume:28 ,  Issue: 4 )

Date of Publication:

July 1984

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