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Re: Difficulty with Interpolation / FunctionInterpolation

  • To: mathgroup at smc.vnet.net
  • Subject: [mg112969] Re: Difficulty with Interpolation / FunctionInterpolation
  • From: "Ingolf Dahl" <ingolf.dahl at telia.com>
  • Date: Fri, 8 Oct 2010 04:50:04 -0400 (EDT)

My "Obtuse" package is written to take care of unstructured interpolation,
and contains five different methods. You could try with your data, and see
if any of the methods work in a satisfactory way. You might download the
package from http://www.familydahl.se/mathematica (free of charge). I have
put a new version there yesterday, and wanted to have that ready before
answering you. Please report if you succeed or not. 

Best regards

Ingolf Dahl

> -----Original Message-----
> From: Thomas Melehan [mailto:tpmelehan at gmail.com]
> Sent: den 29 september 2010 10:16
> To: mathgroup at smc.vnet.net
> Subject: [mg112761] Difficulty with Interpolation / FunctionInterpolation
> 
> I am trying to calculate the volume under a given topography.  The data
> I have is topographic lines with {x,y,z} coordinates that are not on any
> grid pattern.  I am trying to utilize Interpolation or
> FunctionInterpolation to create an InterpolatingFunction for use in
> NIntegration.  It seems that since the data points are not well arranged
> I get the following message:
> 
> Interpolation::"indim" : "
>   StyleBox[\"\"\", \"MT\"]  The coordinates do not lie on a structured
> tensor \
> product grid "
> 
> Does anyone have suggestion as to how I could sort the data to get the
> Interpolation to work?
> 
> 




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