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  • Last update: 5 years ago
  • Total downloads: 74
  • Operating system: Linux, Mac OS X, Win All, BSD, Solaris
  • Publisher: Dan Ellis (9 other programs)
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scripts default iconLagrange Interpolator Polynomial (Scripts) Publisher's description

The two inputs X and Y are vectors defining a set of N points

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.

System Requirements:

MATLAB 7.3 (R2006b)
Program Release Status: New Release
Program Install Support: Install and Uninstall

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