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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