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What is the general form of the Lagrange interpolation polynomial for n+1 data points as described in the chapter?

The general form of the Lagrange interpolation polynomial for n+1 data points is a polynomial of degree n that passes through each of the given points. It is constructed using the formula: \( p(x) = \sum_{i=0}^{n} f(x_i) L_i(x) \), where \( L_i(x) \) are the Lagrange basis polynomials defined as \( L_i(x) = \prod_{j=0, j \neq i}^{n} \frac{x - x_j}{x_i - x_j} \).

Key points

  • Lagrange interpolation polynomial is of degree n for n+1 points.
  • The polynomial passes through all given data points.
  • The formula involves Lagrange basis polynomials for each data point.
Source:Advanced Engineering Mathematics· Numerical solutions of equations and interpolation· p. 50–72

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Cover of Advanced Engineering Mathematics

Advanced Engineering Mathematics

Stroud, K. A, Booth, Dexter J Stroud etc.

4th ed. · Industrial Press, Inc.

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