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APL uses the term operator in Heaviside’s sense as a moderator of a function as opposed to some other programming language's use of the same term as something that operates on data, ref. relational operator and operators generally.
APL (named after the book A Programming Language) [3] is a programming language developed in the 1960s by Kenneth E. Iverson. Its central datatype is the multidimensional array. It uses a large range of special graphic symbols [4] to represent most functions and operators, leading to very concise code.
The programming language APL uses a number of symbols, rather than words from natural language, to identify operations, similarly to mathematical symbols.Prior to the wide adoption of Unicode, a number of special-purpose EBCDIC and non-EBCDIC code pages were used to represent the symbols required for writing APL.
APL syntax and symbols; C. Code page 293; Code page 310; Code page 351; D. Digital encoding of APL symbols; Direct function; E. ELI (programming language) I. ISO-IR-68;
The APL Character Set for Workspace Interchange, registered for use with ISO/IEC 2022 as ISO-IR-68, [1] is a character set developed by the APL Working Group of the Canadian Standards Association. [2] IBM calls it Code page 371. [3] It is one of several APL code pages used for the syntax and symbols used by the APL programming language. [2]
Since direct functions are dfns, APL functions defined in the traditional manner are referred to as tradfns, pronounced "trad funs". Here, dfns and tradfns are compared by consideration of the function sieve : On the left is a dfn (as defined above ); in the middle is a tradfn using control structures ; on the right is a tradfn using gotos ...
The J programming language, developed in the early 1990s by Kenneth E. Iverson and Roger Hui, [5] [6] is an array programming language based primarily on APL (also by Iverson). To avoid repeating the APL special-character problem, J uses only the basic ASCII character set, resorting to the use of the dot and colon as inflections [ 7 ] to form ...
In the early 1990s, Ken Iverson and Hui began collaborating on an advanced continuation of an APL-like language which they named J.The improvements were intended to fix some of the persistent character set issues that had plagued APL since its inception, and to add new advanced features such as support for parallel multiple instruction, multiple data (MIMD) operations.