Extrapolation method used in interpn

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Peter 2016-4-15

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https://ww2.mathworks.cn/matlabcentral/answers/279183-extrapolation-method-used-in-interpn

编辑： Peter 2016-4-16

Hi,

which extrapolation method uses interpn with 'spline' selected?

Thanks, Peter

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Answer 1

Walter Roberson 2016-4-15

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https://ww2.mathworks.cn/matlabcentral/answers/279183-extrapolation-method-used-in-interpn#answer_218064

http://www.mathworks.com/help/matlab/ref/interp1.html#input_argument_method

"Spline interpolation using not-a-knot end conditions. The interpolated value at a query point is based on a cubic interpolation of the values at neighboring grid points in each respective dimension."

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Peter 2016-4-16

编辑：Peter 2016-4-16

Thanks, but I am asking about extrapolation, not interpolation. I know that interpn does extrapolate if I evaluate the spline outside its domain, but I can't find the extrapolation method (linear, Richardson,...) in the documentation.

Thanks, Peter

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Extrapolation method used in interpn

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Extrapolation method used in interpn

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