Question

Can someone help me with matlab?

Answer 1

I don't understand what the lsim does..

Answer 2

[y,t,x] = lsim(T,u,t);

Answer 3

how can I take the output from here and use it to divide by another function?

Answer 4

The outputs you obtain from lsim are going to be the x/y values of the function you ask it to simulate. It shouldn't be difficult to use the output, assuming your other function takes a matrix.
http://www.mathworks.com/help/control/ref/lsim.html