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Subject: Re: [office] chart:interpolation
On Wed, 2011-11-02 at 15:36 -0600, Andreas J. Guelzow wrote: > On Wed, 2011-11-02 at 14:43 -0600, Andreas J. Guelzow wrote: > > On Wed, 2011-11-02 at 14:19 -0600, Patrick Durusau wrote: > > > > 2) Are these all that we want to add? If there are others and we think > > > there is user demand for them, let's add them now if possible. So we > > > don't have to return to this attribute. > > > > I am planning to provide further definition (Those provided by > > libgoffice, ie. the ones are available in Gnumeric.) It would be good to > > have somebody from some other implementations to see what they are > > really doing. > > > > Adding these 4, may also flush out further suggestions in the first > > public review of these changes. > > Sorry, I confused interpolations with trend lines. At this time I am not > planning to suggest to add further interpolations. > I wasn't as confused as I thought. A small bug in the current development version of Gnumeric hid some of the interpolation methods implemented there. So I will be proposing a few more methods: * Cubic spline interpolation with parabolic limits. * Cubic spline interpolation with cubic limits. * Cubic spline interpolation with fixed derivatives at both ends. Rather than adding more attribute values to the chart:interpolation attribute, I believe it would be cleaner (and more in the spirit of the already existing chart:spline-* attribute) to use secondary attributes chart:spline-limits, chart:spline-limits-start, chart:spline-limits-end that would modify the cubic-spline interpolation already provided in ODF 1.2. Gnumeric also provides: * Closed Bezier cubic spline interpolation. Since this is not really a proper "interpolation" method, I am not sure this would be appropriately added here unless other implementations provided a similarly closed interpolation. Andreas -- Andreas J. Guelzow, PhD, FTICA Concordia University College of Alberta
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