Numerical approximation of data interpolation least squares method

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Chapter 1 Numerical approximation of data : interpolation, least squares method

  • numerical approximation

  • taylor series

  • square method

  • power functions

  • given point

  • functions

  • polynomial function


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Poids de l'ouvrage

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Chapter 1
Numerical approximation of data : interpolation, least squares method
1
I. Motivation
Approximation of functions
Evaluation of a function
Which functions (f:RR) can be effectively evaluated in any point ?
Evaluation of a function
Which functions (f:RR) can be effectively evaluated in any point ?
N
the power functions :f(x) =xm, m the p 2x2+
functions : a0+a1x+a
olynomial f(x) =
+amxm ∙ ∙ ∙
Evaluation of a function
Which functions (f:RR) can be effectively evaluated in any point ?
the power functions :f(x) =xm, mN the polynomial functions : f(x) =a0+a1x+a2x2+∙ ∙ ∙+amxm
How can we evaluate other functions in a given point ? for instance :f(x) = cos(x),f(x) = sin(x) exp(x),...
Evaluation of a function
Which functions (f:RR) can be effectively evaluated in any point ?
the power functions :f(x) =xm, mN the polynomial functions : f(x) =a0+a1x+a2x2+∙ ∙ ∙+amxm
How can we evaluate other functions in a given point ? for instance :f(x) = cos(x),f(x) = sin(x) exp(x),...
approximation by a polynomial function : using a Taylor series about the given point, a polynomial having the same values as thesearching function in some close points Lagrange interpolation
Principles of Lagrange interpolation
f(x) = sin(πx)(x2+ 3)
Principles of Lagrange interpolation
f(x) = sin(
πx)(x2+ 3)
4 points on the curve :
(1,4), (1,4), (2,0), (3,12)
Principles of Lagrange interpolation
f(x) = sin(πx)(x
2+ 3)Lagrange interpolating polynomial
4 points on the curve :
(1,4), (1,4), (2,0), (3,12)
Ppolynomial of degree3 satisfying P(1) =4 P(1) =4 P(2) =0 P(3) =12
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