How do I derive frequency bands from EEG data?

Hi there, I am very new at using MATLAB... I am trying to view the 5 frequency bands (delta: 0-3.9 Hz, theta: 4-7.9 Hz, lower alpha: 8-9.9 Hz, upper alpha: 9-12.9 Hz, beta: 13-29.9 Hz, and gamma: 30-40 Hz) for individual channels from EEG data. I've tried going about using the filters provided but nothing seems to be what I want. Please help!