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MathGroup Archive 2005

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Intepolation of an array with missing points

  • To: mathgroup at smc.vnet.net
  • Subject: [mg62323] Intepolation of an array with missing points
  • From: dkjk at bigpond.net.au
  • Date: Sat, 19 Nov 2005 23:19:19 -0500 (EST)
  • Sender: owner-wri-mathgroup at wolfram.com

Hi,

I have an array representing the heights of a surface over the x-y
plane. Unfortunately, the heights at several points are unknown so have
been replaced by empty strings. For an example, see

http://users.bigpond.net.au/jdstokes/output.csv

arr = Import["output.csv"] // MatrixForm

My ultimate goal is to create an interpolating function of this data
which will allow me to produce a contour plot. As a very inexperienced
user of Mathematica, my initial thoughts have been someting like this:

1. Convert arr to an list of 3-tuples, ignoring the empty entries. (not
sure how to do this)
2. Use Interpolation to create an InterpolatingFunction which can be
plotted in ContourPlot.

Does anyone know of a simple method to achieve 1. and whether or not 2.
will work in this case?

Thanks.

James


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