How can I get C code for TriScatter​edInterp/s​catteredIn​terpolant from Code Generator in matlab(I have got fun to C using Code Generator )?

 load 'varianclinac1x1.mat';
 phsp = varianclinac1x1;
 Ephsp = TriScatteredInterp(phsp(:,1),phsp(:,2),phsp(:,3)); %//error

I am getting error during code generation to C, I have tried replacing TriScatteredInterp with scatteredInterpolant but the matlab function itself gives error in running the line. Please provide an alternative solution to the problem.

[KSSV]

What error you are getting? You have not specified any error..

[Walter Roberson]

Neither of those functions is supported for code generation.

[rashmi s]

The error 'undefined function 'TriScatteredInterp'

[rashmi s]

whether any alternative way for function 'TriScatteredInterp' or method that help with C Code Generation.

Answer 1

[Walter Roberson]

You cannot generate code from those routines. You will need to find an alternative.

https://stackoverflow.com/questions/20484233/value-interpolation-in-2d-from-scattered-data

https://github.com/ddemidov/mba

https://github.com/sakov/nn-c

https://people.sc.fsu.edu/~jburkardt/cpp_src/pwl_interp_2d_scattered/pwl_interp_2d_scattered.html

Historically, the MATLAB approach was to use qhull to produce a triangulation, and then for each query point, query which triangle it was in and use the vertices of the triangle to do the interpolation. qhull is a third-party library; if I recall correctly it is from a UK university. If you were producing a commercial product then you might potentially need to negotiate a license to use qhull. (For commercial products, watch out for license conditions on github code as well.)

Answer 2

[Kevin]

CGAL library's linear interpolation can produce almost a same result of "natural" method of scatteredInterpolant. More details shows below

https://stackoverflow.com/questions/30354284/cgal-natural-neighbor-interpolation and https://doc.cgal.org/latest/Interpolation/index.html#secinterpolation