User Manual for the Series Macro Package by Richard C. Waters (MIT AI Memo 1082, 1989).

The benefits of programming in a functional style are well known. In particular, algorithms that are expressed as compositions of functions operating on series/vectors/streams of data elements are much easier to understand and modify than equivalent algorithms expressed as loops. Unfortunately, many programmers hesitate to use series expressions. In part, this is due to the fact that series expressions are typically implemented very inefficiently.

A Common Lisp macro package (called Series) has been implemented that can evaluate a wide class of series expressions very efficiently by transforming them into iterative loops. When using this class of series expressions, programmers can obtain the advantages of expressing computations as series expressions without incurring any run-time overhead.

There is an up-to-date copy of the Series package on Sourceforge.

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