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Interploation/extrapolation problem


I am interpolating a set of data with scattered x,y,z coords and a
given variable (pressure). I can interpolate the data easily enough
generate surfaces and so forth.

Problem is being scattered data some parts of the regularly spaced
array I generate have been extrapolated rather than interpolated.
Consequently I get some dodgy results round the edge of my volume. Is
there anyway I can exclude the extrapolated part of the array?

I don't really want to shrink the volume I use to exclude these edge
effects as due to the layout of the sensors which provide the data I
wouldn't have much left!


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