3.7 | 23 ratings Rate this file 632 downloads (last 30 days) File Size: 561 Bytes File ID: #899

Lagrange polynomial interpolation

07 Oct 2001 (Updated 08 Oct 2001)

No BSD License

File Information
Description	Approx a point-defined function using Lagrange polinomial interpolation method
Acknowledgements	This submission has inspired the following: lagrange interpolation and derivative, Barycentric Lagrange Interpolating Polynomials and Lebesgue Constant, Lagrange Interpolator Polynomial
MATLAB release	MATLAB 5.2 (R10)
Zip File Content
Other Files	lagrange.m

Tags for This File
Everyone's Tags	approximation, approximations, interpolation, lagrange, mathematics, polynomial
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Comments and Ratings (28)
15 Jan 2002	steve xia
22 Jan 2003	keene rolph	The source code is very fantastic.it is good for research especially for mathematics purpose.
20 Feb 2003	oziel alcocer
30 Apr 2003	t t	beautiful,
24 Sep 2003	Sukant Gupta
23 Nov 2003	sima asgari	math
30 Aug 2004	Fahad Abbassi	Man u r a king and matlab is your bitch!!
10 Feb 2005	Aleksey Rozsdobudko	what did u write?????? It can write even a child!!!! dont use such words as "for","while" and anything like that in the matlab cos it's STUPPIDNESS!!!!!!
09 Mar 2005	im einnor	flawless program!
22 Apr 2005	bill cosby	Thank you for a great program
11 May 2005	JJ LS	Very Good
31 May 2005	T B	Great job!!! Good work!
24 Jun 2005	STEFANO IANNARILLI	THANK YOU VERY MUCH FOR IT. I NEEDED FOR MY STUDYING
05 Oct 2005	frederico schultz	muito obrigado...boa sorte
25 Oct 2005	Jev Jeg
09 Nov 2005	Haroon Awais	good work, but it is better to use Matlab "interp1" function.
21 May 2006	haris ahmad	i am a student of electronics engr and hav to do numerical diff using lagrange
28 May 2006	Jose Garcia
07 Oct 2006	John D'Errico	Lagrange interpolation is one of those interpolation methods that beginning textbooks include, along the way to showing you some useful methods. I imagine the textbook authors want to show you some of the history of interpolation. The fact is, high order Lagrange interpolation of this ilk was a only ever a good idea BACK IN the time of Lagrange. There has actually been progress in knowledge since then. (Surprise!) This is a terribly poor choice of interpolation method today. In general, splines or other methods like them (PCHIP) will be less likely to introduce interpolation artifacts, oscillations, etc. Splines will be FAR less sensitive to tiny amounts of noise than will a high order Lagrange. Even if I choose to disregard the method it implements, the code itself is poorly implemented. It is triply looped - totally unvectorized. Expect it to be slow and if you have a large number of points, it will take more memory than need be. If you need to use an interpolation tool, start with interp1, spline, or pchip, or look to the splines toolbox for more choices.
03 Jun 2007	imran aslam
14 Jun 2007	Arc .	Very usefull - I need it for convertion to java code.
25 Oct 2007	hira manzoor
03 Nov 2007	Pier Francesco Maria Gatti	what is x? :D
29 Feb 2008	LAY Nary	I don't know
04 May 2008	mahesh nair
30 May 2008	Satya Sudhakar Yedlapalli	Can be made as a basic matlab function
21 Aug 2008	sanjay zine
15 Oct 2008	pamonz wank

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Tag Activity for this File
Tag	Applied By	Date/Time
approximation	Carlo Castoldi	22 Oct 2008 06:38:17
interpolation	Carlo Castoldi	22 Oct 2008 06:38:17
lagrange	Carlo Castoldi	22 Oct 2008 06:38:17
polynomial	Carlo Castoldi	22 Oct 2008 06:38:17
mathematics	Carlo Castoldi	22 Oct 2008 06:38:17
approximations	Carlo Castoldi	22 Oct 2008 06:38:17

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