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Using Functions and Arrays

In: APL2 in Depth

Author

Listed:
  • Norman D. Thomson

    (Finnock House)

  • Raymond P. Polivka

Abstract

Chapters 1 and 2 discussed functions and operators in relative isolation. Chapters 4 and 5 are about the interactions of various functions and operators and thus provide a study in greater depth of the features of APL2 which are most intimately connected with nested arrays and the associated operations of enclose, disclose and each. Although the basic concepts are few a new perspective is required in order to acquire fluency in application. There is an analogy to the mental leap needed to move from thinking in two dimensional geometry to thinking in three dimensions. Data objects in first-generation APL possess data and structure where structure is synonymous with shape. In APL2 structure is given the additional aspect of depth, thereby releasing the user from the shackles of rectangular data structure and thus making it possible to model data structures of almost indefinite complexity. The price of the flexibility afforded by the combination of data, depth and shape is that the simultaneous control of all three is a skill which has to be consciously acquired through practice in order to exploit the great programming versatility which nested arrays afford.

Suggested Citation

  • Norman D. Thomson & Raymond P. Polivka, 1995. "Using Functions and Arrays," Springer Books, in: APL2 in Depth, chapter 4, pages 89-119, Springer.
    • Handle: RePEc:spr:sprchp:978-1-4612-4172-0_4
    DOI: 10.1007/978-1-4612-4172-0_4
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