How does griddata handle NaN values in MATLAB 7.7 (R2008b)?

I would like to know how the function griddata handles Nan values.

Answer 1

[MathWorks Support Team]

MATLAB doesn't perform any special-case treatment for the NaN data value.

As you may know, griddata performs a Delaunay triangulation of your (x,y) data points. When you query the interpolant at some (xi, yi) location, griddata searches

for the triangle Ti enclosing the point (xi, yi). It then interpolates the result based on the values at the vertices of Ti. If one of those vertices has a NaN value, then the NaN will dominate the computation and the interpolated value you get back will be NaN.