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A stochastic roundoff error analysis for the fast Fourier transform

Author: Daniela Calvetti
Journal: Math. Comp. 56 (1991), 755-774
MSC: Primary 65T20; Secondary 65G05
MathSciNet review: 1068824
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Abstract: We study the accuracy of the output of the Fast Fourier Transform by estimating the expected value and the variance of the accompanying linear forms in terms of the expected value and variance of the relative roundoff errors for the elementary operations of addition and multiplication. We compare the results with the corresponding ones for the direct algorithm for the Discrete Fourier Transform, and we give indications of the relative performances when different rounding schemes are used. We also present the results of numerical experiments run to test the theoretical bounds and discuss their significance.

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Keywords: Accompanying linear forms, floating-point arithmetic, Radix-2 Fast Fourier Transform, rounding errors, random variables
Article copyright: © Copyright 1991 American Mathematical Society