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Mathematics of Computation
Mathematics of Computation
ISSN 1088-6842(online) ISSN 0025-5718(print)

 

On the numerical evaluation of Legendre's chi-function


Authors: J. Boersma and J. P. Dempsey
Journal: Math. Comp. 59 (1992), 157-163
MSC: Primary 65B10
MathSciNet review: 1134715
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Abstract: Legendre's chi-function, $ {\chi _n}(z) = \Sigma _{k = 0}^\infty {z^{2k + 1}}/{(2k + 1)^n}$, is reexpanded in a power series in powers of $ \log z$. The expansion obtained is well suited for the computation of $ {\chi _n}(z)$ in the two cases of real z close to 1, and $ z = {e^{i\alpha }},\alpha \in \mathbb{R}$. For $ n = 2$ and $ n = 3$, the present computational procedure is shown to be superior to the procedure recently proposed by Dempsey, Liu, and Dempsey, which uses Plana's summation formula.


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DOI: http://dx.doi.org/10.1090/S0025-5718-1992-1134715-0
PII: S 0025-5718(1992)1134715-0
Article copyright: © Copyright 1992 American Mathematical Society