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MathGroup Archive 1999

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Re: Interpolation[] problem

  • To: mathgroup at smc.vnet.net
  • Subject: [mg18529] Re: Interpolation[] problem
  • From: Jens-Peer Kuska <kuska at informatik.uni-leipzig.de>
  • Date: Thu, 8 Jul 1999 22:33:00 -0400
  • Organization: Universitaet Leipzig
  • References: <7m14um$pls@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

Hi,

Matheamtica can handel the data on a irregualar but rectangular
spaced grid, here is an example

make some irregular spaced data

data = Table[N[{x^2, y, Sin[x^2*y]}], {x, 0, Pi, Pi/32}, {y, 0, Pi,
Pi/32}];

Here i mus flatten the matrix of 3d points to a list of 3d points

ip = Interpolation[Flatten[data, 1]][x, y]

Now lets look if the points are correct

Show[Graphics3D[Map[Point, data, {2}]]];

and try the interpolation

Plot3D[Evaluate[ip], {x, 0, \[Pi]^2}, {y, 0, \[Pi]}]

Send me the data file to kuska at informatik.uni-leipzig.de
because the moderator has removed it.

Hope that helps
  Jens

Attico Nicola wrote:
> 
> hi all,
> i've an incomprehensible problem with
> Interpolation[].
> I need to interpolate a two dimensional
> function z(x,y) and i've in a file
> the values of the functions in different
> points in the form:
> 
> x_i y_i z_i
> 
> (ive copied my file in attchmnt)


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