-----Original Message----- From: pd-list-bounces@iem.at [mailto:pd-list-bounces@iem.at] On Behalf Of cyrille henry Sent: 10 June 2008 16:30 To: Charles Henry Cc: pd-list@iem.at Subject: Re: [PD] better tabread4~
Charles Henry a écrit :
On Tue, Jun 10, 2008 at 4:43 AM, cyrille henry cyrille.henry@la-kitchen.fr wrote:
i realized that the 4 points interpolation in tabread4~
(and tabosc4~) are not optimal.
Please describe. I've analyze the interpolation formula too, and I think that it is a true cubic interpolation. Is the numerical accuracy bad?
well, i think the tabread4~ interpolation is a lagrange interpolator (but i'm may be wrong). at least with tabread4~, the 1st derivative is not continuous, while it should be with a cubic interpolation.
i program a cubic interpolation, and the shape of the waveform is really different.
Are we talking about 4-point polynomial interpolation versus cubic spline interpolation? These are indeed different.