Stable Methods for Evaluating the Points cos(iπ/n)
- 1 October 1975
- journal article
- Published by Oxford University Press (OUP) in IMA Journal of Applied Mathematics
- Vol. 16 (2) , 247-257
- https://doi.org/10.1093/imamat/16.2.247
Abstract
A variety of alternative methods for evaluating cos(iπ/n) for i= 0, 1,...,n are compared theoretically and experimentally, and the best ones selected on the basis of accuracy and the computational efficiency. The error analysis involved demonstrates how certain mathematically equivalent recurence relations can exhibit very different computational behaviour.Keywords
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