X,Y and XI,YI cannot be arrays of dimension greater than two. Input data cannot be sparse. Input coordinates cannot be complex. METHOD must be one of ''linear'',''cubic'',''nearest'', or ''v4''. Not enough unique sample points specified. Unknown method. The cubic interpolation method supports 2D only. The v4 interpolation method supports 2D only. The underlying triangulation is empty - the points may be collinear. Invalid input arguments. Invalid number of input arguments. Duplicate x-y data points detected: using average values for duplicate points. GRIDDATA no longer requires Qhull-specific options.\nPlease remove these options when calling GRIDDATA. Averaged {0,number,integer} non-distinct points.\n Indices are: {1}.