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## Lagrange polynomial

version 1.0.0.0 (50.4 KB) by
Lagrange form of the interpolation polynomial

Updated 18 Feb 2010

% Polynomial Interpolation Problem: Lagrange Form
% x and y are vectors with the same dimensions
% Given n points: (x_k,y_k) k = 1,2,...n
% this function finds a polynomial P(x) of degree less
% than n such that P(x_k) = y_k
% --
% Remarks:
% The resulting polynomial is displayed in symbolic notation
% --
% Example
% x=[0 1 2 3 4 5 6 7];
% y=[4 -6 -1 16 -2 6 12 17];
% pol=show_polinterp(x,y);
% --
% x=[1 2 3 4 5 6 7];
% y=1+x.^3-x.^6;
% pol=show_polinterp(x,y);
%
% For evaluating pol, try
% subs(pol,x), it will return vector y
%--

### Cite As

Ernesto Momox Beristain (2021). Lagrange polynomial (https://www.mathworks.com/matlabcentral/fileexchange/26724-lagrange-polynomial), MATLAB Central File Exchange. Retrieved .

Eric Bourgogne

Good file, Works OK, easy to use.
The plot is a little misleading, it can be easily improved to show the polynome with a fine pitch.

##### MATLAB Release Compatibility
Created with R2008b
Compatible with any release
##### Platform Compatibility
Windows macOS Linux

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