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Re: polynomial approximation for twenty data points

• To: mathgroup at smc.vnet.net
• Subject: [mg19841] Re: polynomial approximation for twenty data points
• From: Jens-Peer Kuska <kuska at informatik.uni-leipzig.de>
• Date: Sun, 19 Sep 1999 01:20:26 -0400
• Organization: Universitaet Leipzig
• References: <7rsirl$3qs@smc.vnet.net>
• Sender: owner-wri-mathgroup at wolfram.com

Hi arthur,

what means utilized for your case. Mathematica's Interpolation[]
will do what you want.

otherwise, if you need an interpolation in your own C/Fortran code,
the answer is not so simple as it seems.

a) you can use a Lagrange interpolation but for 20 points
   it will probably an oscillating function and not usable for
   you
b) you can make a cubic spline approximation, that uses picewise third
   order polynoms

or one of the other 1001 interpolation algorithms. Look at netlib.org
for a code.

Hope that helps
  Jens

arthur p rohr wrote:
> 
> hello is there any programs on the web that can be down loaded and
> utilized for my case?
> art.