[PD] tabread4~ "broken" interpolation algorithm - was Re: Max Smoother Audio than Pd?

[Matteo Sisti Sette]

By the way tabread4c~ is not in Pd Extended, is it?

Roman Haefeli escribió:
> 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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Matteo Sisti Sette
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http://www.matteosistisette.com