How do I set F.ExtrapolationMethod to 'none' in function 'griddedInterpolant'?

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Nina Jensen
Nina Jensen 2017-5-3
评论： Steven Lord 2017-5-3
Function: griddedInterpolant Q: How/where do I do set F.ExtrapolationMethod to 'none'?
"The behavior of griddedInterpolant has changed. All interpolation methods now support extrapolation by default. Set F.ExtrapolationMethod to 'none' to preserve the pre-R2013a behavior when F.Method is 'linear', 'cubic' or 'nearest'. Before R2013a, evaluation returned NaN values at query points outside the domain when F.Method was set to 'linear', 'cubic' or 'nearest'."

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Stephen23
Stephen23 2017-5-3
编辑：Stephen23 2017-5-3
The griddedInterpolant documentation shows that the extrapolation can be specified by the last argument, after the interpolation method:
F = griddedInterpolant(___,Method,ExtrapolationMethod)
so you will need something like this:
F = griddedInterpolant(___,'linear','none')
Alternatively try changing the object property:
F.ExtrapolationMethod = 'none';
  2 个评论
Nina Jensen
Nina Jensen 2017-5-3
I still get the error code "Error using griddedInterpolant. The grid vectors must contain unique points"
My script is:
%interpolating modelled at observed depth
for j = 1:length(time_obs)
T_subsurf_mod(:,j) = interp1(depth_act(:,j),T_ice(:,j),depth_obs(:,j));
end
T_subsurf_mod and depth_obs are both 11x8784 double and depth_act is a 201x8784 double.
Steven Lord
Steven Lord 2017-5-3
That's a different problem, not related to the ExtrapolationMethod. That suggests to me that the values in depth_act(:, j) are not unique for some j. Set an error breakpoint and when MATLAB enters debug mode, check:
length(depth_act(:, j))
length(unique(depth_act(:, j)))
My guess is that the two lengths will be different.

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