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Subject: Re: [office-comment] Re: improvements for interpolation in charts
Andreas,Will you have time to review the proposal Regina references in the message with subject line: "polynomial regression curve in charts"?
Thanks! Hope you are having a great week! Patrick On 11/10/2011 03:29 PM, Andreas J. Guelzow wrote:
Hi Regina, On Thu, 2011-11-10 at 12:32 -0700, Regina Henschel wrote:Hi all, I have noticed, that you are discussing improvements for interpolations in charts. Currently both kind of interpolations are parametric. That gives nice curves, but for some functions the result can be better with non-parametric methods. So I want to see non-parametric interpolation methods in addition. For example my textbook "Engeln-Müllges, Gisela: Numerik-Algorithmen" suggests the "Akima Subsplines" for not smooth functions. It should be possible to use such interpolations too.In fact they should be relatively easy to implement. I'll put them on the list of interpolation methods to define (hopefully for 1.3).If the already made suggestion "fixed derivatives at both ends" includes "non-parametric" too, I would second that kind. I do not find the term "parabolic limits" besides in the description of the application "goffice". What does it mean? Is it the same as "parabolically terminated"? And what does "cubic limits" mean? [I'm no professional mathematician, but will implement those interpolations. So please excuse me, if my questions are stupid.]I really don't yet what specifically these methods are. I still have to analyse the goffice code to see what they are calculating, determine whether these are mathematically reasonable (and standard (in the sense of "accepted in the field") and then write them down in a way that non-mathematicians can implement them. I'll let you know when I have a first draft. Andreas
-- Patrick Durusau patrick@durusau.net Chair, V1 - US TAG to JTC 1/SC 34 Convener, JTC 1/SC 34/WG 3 (Topic Maps) Editor, OpenDocument Format TC (OASIS), Project Editor ISO/IEC 26300 Co-Editor, ISO/IEC 13250-1, 13250-5 (Topic Maps) Another Word For It (blog): http://tm.durusau.net Homepage: http://www.durusau.net Twitter: patrickDurusau
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