Scattered Interpolant in matlab

I have matrices xs,ys,z. All the matrices are stored in a workspace and has size 41x50.

I would like to interpolate and store them in 2D lookup table. is it possible to use spline/cubic method in scatteredinterpolant command?

I used in the code but getting these errors.

Answer 1

[Star Strider]

The interpolation Method options are 'linear', 'nearest' and 'natural' (natural neighbor interpolation, giving no details that I can find, only an example).

The ExtrapolationMethod options are 'linear' 'nearest' or 'none'.

[the cyclist]

I couldn't find a description of natural-neighbor interpolation in the MathWorks documentation, either. The Wikipedia article on the method is useful.

[SGK]

out of these methods which can gives a good interpolation results?

I have seen that cubic and spline methods are very reliable since I cant able to use them in scatteredinterpolant what other methods can I use to interpolate these matrices?

[Star Strider]

I always experiment with all of them tto see which gives the best result, and again it depends on what I want to do (interpolate in a region, or draw a line on the surface, for example, because scatteredInterpolant computes lines well).

With respect to extrapolation, I again experiment, although in that instance, usually end up using 'nearest'.

Answer 2

[Catalytic]

No. There is no such thing as spline interpolation or extrapolation when you are dealing with scattered data. It is inherently a gridded data thing.

Answer 3

[the cyclist]

No, according to the documentation for scatteredInterpolant, the available extrapolation methods are 'nearest', 'linear', or 'none'.