Are Hermite Polynomials Always Cubic When Used for Interpolation?

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Discussion Overview

The discussion revolves around the nature of Hermite interpolation polynomials, specifically whether they are necessarily cubic when used to interpolate between two points. The scope includes theoretical aspects of polynomial interpolation and the conditions under which cubic polynomials are applied.

Discussion Character

  • Debate/contested

Main Points Raised

  • One participant questions if Hermite interpolation polynomials are always cubic, referencing a source that describes them as "clamped cubic."
  • Another participant clarifies that a cubic polynomial can be constructed to satisfy specific constraints at two points, providing a general form of the cubic polynomial and the equations involved.
  • A different participant suggests that for certain configurations of points and slopes, the minimum curve that connects them is indeed a cubic polynomial.
  • A follow-up post expresses a desire for further engagement or clarification on the topic.

Areas of Agreement / Disagreement

Participants do not appear to reach a consensus, as there are differing views on the necessity of cubic polynomials in Hermite interpolation and the conditions that apply.

Contextual Notes

The discussion does not resolve the conditions under which Hermite polynomials are cubic, nor does it clarify the implications of the constraints mentioned.

ice109
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are hermite interpolationg polynomials necessarily cubic even when used to interpolate between two points?

this page would have me believe so in calling it a "clamped cubic" :

http://math.fullerton.edu/mathews/n2003/HermitePolyMod.html
 
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It's more the case that there exists a cubic polynomial of the form:

a x3 + b x2 + c x + d, which satisfies the constraints at two points, (x0, y0) and (x1, y1), where

p(x0) = f(x0) = y0

p(x1) = f(x1) = y1

and

p'(x0) = f'(x0) = y'0

p'(x1) = f'(x1) = y'1

4 equations, and 4 unknowns (a, b, c, d)

This is the basis of the cubic spline.
 
i think given that argument for some groups of points with slopes the minimum curve that goes through both is a cubic.
 
anyone?
 

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