Apl Programming and Computer Techniques

APL (A Programming Language) is an array programming language based on a notation invented in 1957 by Kenneth E. Iverson while at Harvard University. It originated as an attempt to provide consistent notation for the teaching and analysis of topics related to the application of computers. Iverson published his notation in 1962 in a book titled A Programming Language. By 1965, a subset of the notation was implemented as a programming language, then known as IVSYS. Later, prior to its commercial release, APL got its name from the title of the book. Iverson received the Turing Award in 1979 for his work.

The APL language features a rich set of operations which work on entire arrays of data, like the vector instruction set of a SIMD architecture. While many computer languages would require iteration to, for example, add two arrays together, functions in APL typically deal with entire arrays at once. In conjunction with a special character set where glyphs represent operations to be performed, this drastically reduces the potential number of loops and allows for smaller, more concise and compact programs.

As with all programming languages that have had several decades of continual use, APL has evolved significantly, generally in an upwards-compatible manner, from its early releases. APL is usually interpretive and interactive, and normally features a read-evaluate-print loop (REPL) for command and expression input. Today, nearly all modern implementations support structured programming while several dialects now feature some form of object oriented programming constructs.

One distinctive aspect of APL is the use of a special character set visually depicting the operations to be performed. Iverson's notation was used to describe the IBM System/360 machine architecture, a description much more concise and exact than the existing documentation and revealing several previously unnoticed problems. Later, a Selectric typeball was specially designed to write a linear representation of this notation.

# 384 pages
# Publisher: Van Nostrand Reinhold (January 1970)
# ISBN-10: 0442242514
# ISBN-13: 978-0442242510

PDF HERE:

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http://rapidshare.com/files/111477374/APL_Pro1.pdf

DJVU HERE:

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http://rapidshare.com/files/111478926/APL.Pro.djvu

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