DefinitionIntermediate
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
Related questions
Advanced Engineering Mathematics
Stroud, K. A, Booth, Dexter J Stroud etc.
4th ed. · Industrial Press, Inc.