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Lagrange Interpolator Polynomial

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The two inputs X and Y are vectors defining a set of N points. The function uses Lagrange's method to find the N-1th order polynomial that passes through all these points, and returns in P the N coefficients defining that polynomial. Then, polyval(P,X) = Y.
R returns the x co-ordinates of the N-1 extrema/inflection points of the resulting polynomial (roots of its derivative), and S returns the value of the polynomial at those points.

For a general-purpose way to find a smooth curve connecting points, you probably want to use SPLINE instead.

Free download from Shareware Connection - The two inputs X and Y are vectors defining a set of N points

Publisher: Dan Ellis | License: Shareware
Version: 1.0 | Size: 20 KB | Platform: Matlab, Scripts
Released Date: 07-03-2013 | Rating: 0 | Title: Lagrange Interpolator Polynomial

Author Url: http://www.mathworks.com
Program Info Url: http://www.mathworks.com
Download Url: http://www.mathworks.com/matlabcentral/fx_files/13151/1/lagrangepoly.zip

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