Indexing and merging in APL

ABSTRACT

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 review of indexing constructs in various APL systems.

REFERENCES

• Br71: Brown, J.A.,"A Generalization of APL" Doctoral Thesis, Dept. of Systems and information Sciences, Syracuse University, NY 1971
• Fa82: A. D. Falkoff, Semicolon-bracket notation: A hidden resource in APL, ACM SIGAPL APL Quote Quad, v.13 n.1, p.113-116, September 1982
• Gh73: Ghandour, Z.J. and Mezei, J., "Generalized Arrays, Operators and Functions" IBM Journal of R&D, Volum 17 No 4, 1973
• HuiS7: IIui, Roger,"Some Uses of { and }" APL87 - APL Quote-Quad, Vol 17 No 4, ACM, NY 1987
• IBMXZ: "APL2 Language Manual", Program Number 5798-DJP, Manual SB21-3015, IBM Corp., 1982
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• lv83: Iverson, K.E.,"Rationalized APL" I.P. Sharp Research Report Number 1, Revision 1, II'. Sharp Associates Limited, Toronto 1983
• Iv86: Iverson, K.E.,"A Dictionary of API," I.P. Sharp Associates Limited, Toronto 1986
• Pe81: Roland H. Pesch, Indexing and indexed replacement in APL, ACM SIGAPL APL Quote Quad, v.12 n.1, p.258-261, September 1981
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INDEX TERMS

Primary Classification:
  D. Software
  D.3 PROGRAMMING LANGUAGES
      D.3.2 Language Classifications

          Nouns: APL

Additional Classification:
  E. Data
  E.1 DATA STRUCTURES
      Subjects: Arrays

  H. Information Systems
  H.3 INFORMATION STORAGE AND RETRIEVAL
      H.3.1 Content Analysis and Indexing
          Subjects: Indexing methods

General Terms:
Languages