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Hi All, we'd like to use GSL (or pygsl, for that matter) to get Chebyshev approximations (polynomial degrees on the order of approx. ten) to tabulated values (currently all equidistant). I cannot find a free implementation, maybe someone can help out? Does anybody have a function to do it? Otherwise I would need to write one myself. There is a function in NAG to perform this, they give the following references; can anybody help me getting them, esp. ref. 2 and 3? ,---- | Clenshaw C W (1960) Curve fitting with a digital computer Comput. J. 2 | 170-173 | | Cox M G (1974) A data-fitting package for the non-specialist user | Software for Numerical Mathematics (ed D J Evans) Academic Press | | Cox M G and Hayes J G (1973) Curve fitting: a guide and suite of | algorithms for the non-specialist user NPL Report NAC26 National | Physical Laboratory | | Forsythe G E (1957) Generation and use of orthogonal polynomials for | data fitting with a digital computer J. Soc. Indust. Appl. Math. 5 | 74-88 | | Gentleman W M (1969) An error analysis of Goertzel's (Watt's) | method for computing Fourier coefficients Comput. J. 12 160-165 | | Hayes J G (ed.) (1970) Curve fitting by polynomials in one variable | Numerical Approximation to Functions and Data Athlone Press, London `---- Do you know other/better (or easier to get) literature? Thank you in advance. Greetings, Jochen -- Einigkeit und Recht und Freiheit http://www.Jochen-Kuepper.de Liberté, Égalité, Fraternité GnuPG key: CC1B0B4D Sex, drugs and rock-n-roll
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