Please solve using MatLab ONLY.

My issue is really with understanding the blocks...

Computational Modeling.

Construct your own mat lab function (you can get Matlab Fcn from: Simulink->User defined Functions). Put it together with a Scope and use Ramp as an input signal. You can find it in Simulink->Sources.

Click on Ramp and in this symbol you can find three argument: slope, start time and initial output. Use the following settings, slope=1, start time=2 and initial output=2.

Afterwards set the Matlab Function to a sine function. Just write sin. Run the model! Add more functions to the model above. Enter Simulink->Math Operations and drag the blocks Abs and Gain to the current model window. Double click the Gain and change the value to 3. Add also some extra Scopes in order to see precisely what happens in every step. Mark Scope and press the right mouse button and drag how many scopes you desire.

What we have here is a full wave rectifier with an amplifier.

MATLAB Function Ramp