I have a data series with 200 data points and I need to compress this information to 108 data points. I don't think I can use a moving average filter as the window wouldn't be an integer so is there a way in MATLAB to do this?
I have no idea what your data are or what you want to do with them, other than reduce the number of them.
Interpolating them to a shorter independent variable vector may be an option. See if the interp1 function can do what you want. The linspace function can be helpful in providing the new independent variable vector.