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Subject: Re: [office-comment] Re: improvements for interpolation in charts


Will you have time to review the proposal Regina references in the message with subject line: "polynomial regression curve in charts"?


Hope you are having a great week!


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.


Patrick Durusau
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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