Delaunay triangles extrapolation

I was wondering if it would be possible, to add “Extrapolate()” function to TGraph2D (or rather extend Interpoalate()). A point lying outside the area contained in delaunay triangles I think still can be attached to one of the slopes that is an extension of one of the triangles and thus such an extrapolation could be possible…

Did anyone of ROOTers tried such a thing?

Extrapolation as you describe it here would very difficult to implement in a general case. The main reason being the choice of the triangle to be extended. I guess the best answer for your case is to make sure that the points you are trying to interpolate are lying under a triangle. For that you can add triangles or make some larger.

I guess you have in mind some particular case for with it might work but in general that will not fly.