[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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