Chapter 2 Polynomial Interpolation - Part1 : Lagrange Polynomials

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This chapter covers the following topics
Interpolation,
Linear interpolation,
Polynomial interpolation,
Lagrange polynomials,
Barycentric formula,
Newton divided differences

matlab programs are given and explained
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one question though to compute L_i, we also need (n-1) subtraction for numerator and denominator as well. why are we not counting them?

MesbahSalekeen
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Could someone explain what is meant by the function not being differentiable at the point x_i?

sammusaev