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Thread: [SOLVED] Higher Order Interpolation

  1. #1
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    [SOLVED] Higher Order Interpolation

    I've been going over this problem again and again and I can't seem to figure out what interpolation method to use.

    If $\displaystyle f \in C^2[a,b]$ and $\displaystyle a = x_0 < x_1 < \cdots < x_n = b$, and the following values are given:
    $\displaystyle f(x_0)\quad f(x_1)\: \cdots \: f(x_n)$
    $\displaystyle f'(x_0)\quad f'(x_1)\: \cdots \: f'(x_n)$
    $\displaystyle f''(x_0)\quad f''(x_1)\: \cdots \: f''(x_n)$

    Give a formula for the (unique) polynomial $\displaystyle K_{3n+2}(x)$ of degree $\displaystyle \leq 3n+2$ where $\displaystyle K_{3n+2}(x_j) = f(x_j)$, $\displaystyle K'_{3n+2}(x_j) = f'(x_j)$ and $\displaystyle K''_{3n+2}(x_j) = f''(x_j)$ for $\displaystyle j=0,\ldots,n$

    I'd really appreciate any help you could offer. Thanks a lot!
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  2. #2
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    Well, the right method to use was Hermite interpolation, but my textbook never specified that it could go beyond $\displaystyle K(x_i) = f(x_i)\text{ and } K'(x_i) = f'(x_i)$...
    I've submitted a new thread asking about that.
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