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TitleTwin-float arithmetic
Author(s) John Abbott
TypeArticle in Journal
AbstractWe present a heuristically certified form of floating-point arithmetic and its implementation in CoCoALib. This arithmetic is intended to act as a fast alternative to exact rational arithmetic, and is developed from the idea of paired floats expounded by Traverso and Zanoni (2002). As prerequisites we need a source of (pseudo-)random numbers, and an underlying floating-point arithmetic system where the user can set the precision. Twin-float arithmetic can be used only where the input data are exact, or can be obtained at high enough precision. Our arithmetic includes a total cancellation heuristic for sums and differences, and so can be used in classical algebraic algorithms such as Buchberger’s algorithm. We also present a (new) algorithm for recovering an exact rational value from a twin-float, so in some cases an exact answer can be obtained from an approximate computation. The ideas presented here are implemented as a ring in CoCoALib, called RingTwinFloat, allowing them to be used easily in a wide variety of algebraic computations (including Gröbner bases).
KeywordsHeuristically guaranteed finite-precision arithmetic
ISSN0747-7171
URL http://www.sciencedirect.com/science/article/pii/S0747717111001970
LanguageEnglish
JournalJournal of Symbolic Computation
Volume47
Number5
Pages536 - 551
Year2012
Edition0
Translation No
Refereed No
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