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Re: 2d-interpolate between scattered values


From: Helios de Rosario
Subject: Re: 2d-interpolate between scattered values
Date: Thu, 20 Jun 2013 17:03:39 +0200

You may want use this:
http://www.gnu.org/software/octave/doc/interpreter/Interpolation-on-Scattered-Data.html


http://www.gnu.org/software/octave/doc/interpreter/Multi_002ddimensional-Interpolation.html

Helios

-- 
Helios de Rosario Martínez
 
 Researcher


>>> El día 20/06/2013 a las 12:51, Caroline Lindberg
<address@hidden> escribió:
> Hi,
> I have some problems finding a solution to a problem.
> I have three vectors, describing positions in x and y as well as the
height
> z. z are isocurves for equal height, I have five of them (600, 800,
1000,
> 1200 and 1300)
> The positions (x,y) do not form a grid, but are scattered over the
> area [xmin xmax ymin ymax].
> 
> My data is:
> x=[-0.22 0.12 0.62 -0.38 0.20 0.55 -0.76 -0.15 -0.03 0.05 0.17 0.48
-0.96
> -0.62 -0.25 -0.04 0.23 -0.88 -0.43 -0.30];
> 
> y=[0.02 0.32 0.75 0.06 0.52 0.82 0.12 0.48 0.56 0.62 0.70 0.97 0.56
0.57
> 0.66 0.82 0.98 0.84 0.86 0.88];
> 
> z=[600 600 600 800 800 800 1000 1000 1000 1000 1000 1000 1200 1200
1200
> 1200 1200 1300 1300 1300];
> What I would like to do is to know the value of z for a given point
> (xi,yi). I have figured out that I have a problem not having the
data
> nicely spread over a square grid. I have tried to search for a
solution,
> but cannot find any that seems to fit my problem.
> 
> Can you please give me some tips of how to perform a
2d-interpolation?
> 
> Thanks in advance,
> Caroline Lindberg

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