MATLAB: Error plotting bode diagram of a transfer function inside a matrix

bode diagrambode plot of a matrixfrequency responsetransfer function

I am trying to plot bode diagram of an element inside a matrix. The transfer function is alright if i plot G11 which is first row first column matrix. But the bode plot gives error. Is there a different way to plot such bode diagram ? My code is below.
syms s
    G11=s-1;G12=s;
    G21=-6;G22=s-2;
    den=1.25*(s+1).*(s+2);
    G=[G11, G12;G21, G22]/den;
   
   G1=G(1,1);
    G2=G(1,2);
    G3=G(2,1);
    G4=G(2,2);  
  bode(G1)
I even tried G11 by removing all G1…G4. But still doesnt work. Please guide.

Best Answer

That is not the error.
The error is that you are using the Symbolic Math Toolbox when you need to be using the Control System Toolbox.
Try this: 
s = tf('s');
G11=s-1;G12=s;
G21=-6;G22=s-2;
den=1.25*(s+1).*(s+2);
G=[G11, G12;G21, G22]/den;
G1=G(1,1);
G2=G(1,2);
G3=G(2,1);
G4=G(2,2);
bode(G1)
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