Is there an existing R function to perform n-dimensional linear interpolation, like MATLAB's interpn ( http://www.mathworks.com/help/matlab/ref/interpn.html; a Python version is here: https://github.com/scipy/scipy/issues/2246#issuecomment-17028264)? My searches didn't turn up anything. Maybe not terribly difficult to implement, but I didn't want to reinvent the wheel... Thanks, Steven Matz [[alternative HTML version deleted]]