Interpolation::inddp
ListInterpolation::inddp
An error occurs because the grid points specified in the second argument of ListInterpolation are not all distinct:
ListInterpolation[{3, 4, 1, 5, 6, 4}, {{1, 2, 3, 3, 4, 5}}]This shows a valid specification of grid points in ListInterpolation:
ListInterpolation[{3, 4, 1, 5, 6, 4}, {{1, 2, 3, 4, 5, 6}}]