[PD] tabread4~ "broken" interpolation algorithm - was Re: Max Smoother Audio than Pd?
Roman Haefeli
reduzierer at yahoo.de
Mon Mar 29 14:11:43 CEST 2010
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???
Check this thread:
http://lists.puredata.info/pipermail/pd-list/2008-06/062878.html
Roman
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