On Mon, 2010-03-29 at 13:49 +0200, Matteo Sisti Sette wrote: > Claude wrote: > > If you use [tabread4] to interpolate graphical > > parameters for animations, the discontinuities in the derivatives are > > really obvious. > [....] > > But IMHO if you're doing piecewise cubic interpolation, it's a bit > > of a nonsense to have a cubic that goes through all 4 points when > > it's only being used between the inner-most 2 points > > Well using 4 points to interpolate the curve that goes between the two > inner points should guarantee the absence of discontinuities in the > first (and second?) derivative; that should be the purpose. Now if there > actually are discontinuities then there must be some trivial error in > the equation, no???? > > Or am I missing something???
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