Re: Spline Interpolation and cubic interpolation


Ron N. wrote:
> robert bristow-johnson wrote:
> > for 3rd order polynomial interpolation, it's usually 4 data points (and
> > you're interpolating between the inner two data points).
> ...
> > a 3rd order Hermite interpolation polynomial will match the 0th and 1st
> > derivative at the 1st and 2nd point.
>
> This is for symmetric interpolation.
....
yes, true.

my preconceptions stem from doing this on audio signals and normally i
expect this symmetry (or reversibility - the interpolation should work
just the same if you played the audio backwards) to be sorta normative.

but, you're right, it doesn't have to be.

r b-j

.