Extrapolation method used in interpn

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Peter
Peter 2016-4-15
编辑： Peter 2016-4-16
Hi,
which extrapolation method uses interpn with 'spline' selected?
Thanks, Peter

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回答（1 个）

Walter Roberson
Walter Roberson 2016-4-15
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
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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