plot - Plotting time graph in MATLAB

I have a function of this form in MATLAB,

C=S*e^(L*t)*inv(S)*C_0

where my

     S=[-2 -3;3 -2] 
     L=[0.5 0; 0 1.5]
     C_0=[1; 1]

I need to plot this function with respect to time. My output C is a 2-by-1 matrix.

What I have done is computed e^L separately using b=expm(L) and then I inserted mpower(b,t) into the function. So my resulting function in the script looks like

  b=expm(L);
  C=S*mpower(b,t)*inv(S)*C_0;

Now, how should I go about plotting this w.r.t time. I tried defining the time vector and then using it, but quite obviously I get the error message which says matrix dimensions do not agree. Can someone give me a suggestion?