The very simplest way to get data from MATLAB into LTspice is to use .wav files.? MATLAB can read and write wave files and LTspice can read and write these files.? See examples:
C:\Program Files\LTC\LTspiceXVII\examples\Educational\wavein.asc
C:\Program Files\LTC\LTspiceXVII\examples\Educational.waveout.asc
Note: You have to look at the folder where you installed LTspice which might not be same as me.
Good luck,
Dan
